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Yu QH, Huang R, Wu KY, Han XL, Cheng YJ, Liu WL, Zhang AQ, Qin SY. Infection-activated lipopeptide nanotherapeutics with adaptable geometrical morphology for in vivo bacterial ablation. Acta Biomater 2022; 154:359-373. [PMID: 36191775 DOI: 10.1016/j.actbio.2022.09.067] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 08/30/2022] [Accepted: 09/26/2022] [Indexed: 12/14/2022]
Abstract
The nonselective membrane disruption of antimicrobial peptides (AMPs) helps in combating the antibacterial resistance. But their overall positive charges lead to undesirable hemolysis and toxicity toward normal living cells, as well as the rapid clearance from blood circulation. In consequence, developing smart AMPs to optimize the antimicrobial outcomes is highly urgent. Relying on the local acidity of microbial infection sites, in this work, we designed an acidity-triggered charge reversal nanotherapeutics with adaptable geometrical morphology for bacterial targeting and optimized therapy. C16-A3K4-CONH2 was proposed and the ε-amino groups in lysine residues were acylated by dimethylmaleic amide (DMA), enabling the generated C16-A3K4(DMA)-CONH2 to self-assemble into negatively charged spherical nanostructure, which relieved the protein adsorption and prolonged blood circulation in vivo. After the access of C16-A3K4(DMA)-CONH2 into the microbial infection sites, acid-sensitive β-carboxylic amide would hydrolyze to regenerate the positive C16-A3K4-CONH2 to destabilize the negatively charged bacterial membrane. In the meanwhile, attractively, the self-assembled spherical nanoparticle transformed to rod-like nanostructure, which was in favor of the efficient binding with bacterial membranes due to the larger contact area. Our results showed that the acid-activated AMP nanotherapeutics exhibited strong and broad-spectrum antimicrobial activities against Yeast, Gram-positive Staphylococcus aureus, Gram-negative Escherichia coli, and methicillin-resistant Staphylococcus aureus (MRSA). Moreover, the biocompatible lipopeptide nanotherapeutics dramatically improved the dermapostasis caused by bacterial infection. The strategy of merging pathology-activated therapeutic function and morphological adaptation to augment therapeutic outcomes shows the great potential for bacterial inhibition. STATEMENT OF SIGNIFICANCE: The overall positive charges of antimicrobial peptides (AMPs) lead to undesirable hemolysis and nonselective toxicity, as well as the rapid clearance from blood circulation. Infection-activated lipopeptide nanotherapeutics with adaptable geometrical morphology were developed to address these issues. The self-assembled lipopeptide was pre-decorated to reverse the positive charge to reduce the hemolysis and nonselective cytotoxicity. After accessing the acidic infection sites, the nanotherapeutics recovered the positive charge to destabilize negatively charged bacterial membranes. Meanwhile, the morphology of self-assembled nanotherapeutics transformed from spherical nanoparticles to rod-like nanostructures in the lesion site, facilitating the improved association with bacterial membranes to boost the therapeutic efficiency. These results provide new design rationale for AMPs developed for bacterial inhibition.
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Affiliation(s)
- Qi-Hang Yu
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central Minzu University, Wuhan, 430074, China
| | - Rong Huang
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, P. R. China
| | - Kai-Yue Wu
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, P. R. China
| | - Xiao-Le Han
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central Minzu University, Wuhan, 430074, China
| | - Yin-Jia Cheng
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central Minzu University, Wuhan, 430074, China
| | - Wen-Long Liu
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central Minzu University, Wuhan, 430074, China
| | - Ai-Qing Zhang
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central Minzu University, Wuhan, 430074, China
| | - Si-Yong Qin
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central Minzu University, Wuhan, 430074, China.
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Wang QY, Chen HP, Wu KY, Li X, Liu JK. Antibacterial and β-amyloid precursor protein-cleaving enzyme 1 inhibitory polyketides from the fungus Aspergillus chevalieri. Front Microbiol 2022; 13:1051281. [PMID: 36483193 PMCID: PMC9722750 DOI: 10.3389/fmicb.2022.1051281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 11/07/2022] [Indexed: 11/04/2023] Open
Abstract
One new prenylated benzenoid, (±)-chevalieric acid (1), and four new anthraquinone derivatives, (10S,12S)-, (10S,12R)-, (10R,12S)-, and (10R,12R)-chevalierone (2-5), together with ten previously described compounds (6-15), were isolated from the fungus Aspergillus chevalieri (L. Mangin) Thom and Church. The structures of new compounds were elucidated by extensive 1D and 2D nuclear magnetic resonance (NMR), and HRESIMS spectroscopic analysis. The absolute configurations of 2-5 were determined by experimental and calculated electronic circular dichroism (ECD) and DP4+ analysis. Compound 10 showed weak cytotoxicity against human lung cancer cell line A549 with IC50 39.68 μM. Compounds 2-5 exhibited antibacterial activities against the methicillin-resistant Staphylococcus aureus (MRSA) and opportunistic pathogenic bacterium Pseudomonas aeruginosa. The MIC value for compound 6 against MRSA is 44.02 μM. Additionally, Compounds 8, 10, 11 showed weak to moderate inhibitory activities against the β-secretase (BACE1), with IC50 values of 36.1, 40.9, 34.9 μM, respectively.
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Affiliation(s)
- Qing-Yuan Wang
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, China
| | - He-Ping Chen
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, China
| | - Kai-Yue Wu
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, China
| | - Xinyang Li
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Japan
| | - Ji-Kai Liu
- School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, China
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Wu KY, Chen SY, Sun GA, Peng SM, Peng M, Yan H. Experimental Limits on Exotic Spin and Velocity Dependent Interactions Using Rotationally Modulated Source Masses and an Atomic-Magnetometer Array. Phys Rev Lett 2022; 129:051802. [PMID: 35960570 DOI: 10.1103/physrevlett.129.051802] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 07/07/2022] [Indexed: 06/15/2023]
Abstract
Various theories beyond the standard model predict new interactions mediated by new light particles with very weak couplings to ordinary matter. Interactions between polarized electrons and unpolarized nucleons proportional to g_{V}^{N}g_{A}^{e}σ[over →]·v[over →] and g_{A}^{N}g_{A}^{e}σ[over →]·v[over →]×r[over →] are two such examples, where σ[over →] is the spin of the electrons, r[over →] and v[over →] are position and relative velocity between the polarized electrons and nucleons, g_{V}^{N}/g_{A}^{N} is the vector or axial-vector coupling constant of the nucleon, and g_{A}^{e} is the axial-vector coupling constant of the electron. Such interactions involving a vector or axial-vector coupling g_{V}^{N}/g_{A}^{N} at one vertex and an axial-vector coupling g_{A}^{e} at the polarized electron vertex can be induced by the exchange of spin-1 bosons. We report new experimental upper limits on such exotic spin-velocity-dependent interactions of the electron with nucleons from dedicated experiments based on a recently proposed scheme. We rotationally modulated two ∼6 Kg source masses at a frequency of 20 Hz. We used four identical atomic magnetometers in an array form to increase the statistics and cancel the common-mode noise. We applied a data processing method based on high precision numerical integration for the four harmonic frequencies of the signal. We reverse the rotation direction of the source masses to flip the signal due to the new interactions; thus, we can apply the [+1,-3,+3,-1] weighting method to remove possible slow drifting. Our constraint on the product of vector and axial-vector couplings is |g_{V}^{N}g_{A}^{e}|<2.1×10^{-34} and on the product of axial-vector and axial-vector couplings is |g_{A}^{N}g_{A}^{e}|<2.4×10^{-22} for an interaction range of 10 m. The new constraints on vector-axial-vector interaction improved by as much as more than 4 orders of magnitude and on axial-axial interaction by as much as 2 orders of magnitude in the corresponding interaction range, respectively.
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Affiliation(s)
- K Y Wu
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, Sichuan 621900, China
| | - S Y Chen
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, Sichuan 621900, China
| | - G A Sun
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, Sichuan 621900, China
| | - S M Peng
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, Sichuan 621900, China
| | - M Peng
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, Sichuan 621900, China
| | - H Yan
- Key Laboratory of Neutron Physics, Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, Sichuan 621900, China and Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, Sichuan 621900, China
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Wu KY, Zhu Z, Wang Y, Yin SJ, Li GY, Kong ZB, Liu Y, Li H, Song S, Liu H. [The association between Cathepsin S and pulmonary function and CT phenotypes in patients with chronic obstructive pulmonary disease]. Zhonghua Jie He He Hu Xi Za Zhi 2019; 42:372-377. [PMID: 31137114 DOI: 10.3760/cma.j.issn.1001-0939.2019.05.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the value of cathepsin S in the bronchoalveolar lavage fluid (BALF) of patients with chronic obstructive pulmonary disease (COPD) in the evaluation of pulmonary function and CT phenotypes. Method: From April 2014 to April 2017, 46 patients with stable COPD were enrolled, and 29 healthy volunteers served as the control group. The patients were divided into 4 subgroups: GOLD Ⅰ(n=12), GOLD Ⅱ(n=6), GOLD Ⅲ(n=14), GOLD Ⅳ(n=14). The levels of cathepsin S and IFN-γ in BALF were determined by enzyme-linked immunosorbent assay (ELISA). The percentage ratio of low attenuation area to total lung area (LAA%), two times the ratio of airway wall thickness to outer diameter(2T/D), and the ratio of wall area to total cross-sectional area (WA) were measured by HRCT. Results: There were significant differences in the levels of cathepsin S in BALF between the groups (F=6.639, P=0.000). BALF cathepsin S levels were as follows: GOLD Ⅳ grou P>GOLD Ⅲ grou P>GOLD Ⅱ grou P>GOLD group Ⅰ >healthy control group (P value were all<0.05); LAA grade 3>LAA grade 2>LAA grade 1>LAA grade 0 (P value were all<0.05). Correlation analysis showed that BALF cathepsin S levels were correlated negatively with FEV(1)/FVC, FEV(1)% predicted, and DLCO% (r value was -0.065、-0.576、-0.392, respectively, P value were all<0.05), and but positively with RV/TLC%, LAA%, 2T/D, WA and IFN-γ(r value was 0.695, 0.497, 0.142, 0.309, 0.148, respectively, P value were all<0.05). Conclusion: The levels of cathepsin S were associated with the degree of airflow limitation and emphysema phenotype in COPD.
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Affiliation(s)
- K Y Wu
- Department of Respiratory, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 201306, China
| | - Z Zhu
- Second Department of Internal Medicine, Ludian People's Hospital, Yunnan 657100, China
| | - Y Wang
- Department of Respiratory, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 201306, China
| | - S J Yin
- Department of Respiratory, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 201306, China
| | - G Y Li
- Department of Respiratory, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 201306, China
| | - Z B Kong
- Department of Respiratory, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 201306, China
| | - Y Liu
- Department of Respiratory, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 201306, China
| | - H Li
- Department of Respiratory, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 201306, China
| | - S Song
- Department of Respiratory, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 201306, China
| | - H Liu
- Pulmonary Function Test Room, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 201306, China
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Wu KY, Juneau D, Kaps N, Renaud JM, Ruddy TD, Beanlands RS, De Kemp R. P302Routine PET imaging of myocardial flow reserve using simple activity ratios - internal validation using Rb-82-chloride and N-13-ammonia. Eur Heart J Cardiovasc Imaging 2019. [DOI: 10.1093/ehjci/jez148.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- K Y Wu
- University of Ottawa Heart Institute, Ottawa, Canada
| | - D Juneau
- Centre de recherche du CHUM, Service de médecine nucléaire, Montreal, Canada
| | - N Kaps
- Queen"s University, Biomedical and Molecular Sciences, Kingston, Canada
| | - J M Renaud
- University of Ottawa Heart Institute, Ottawa, Canada
| | - T D Ruddy
- University of Ottawa Heart Institute, Ottawa, Canada
| | - R S Beanlands
- University of Ottawa Heart Institute, Ottawa, Canada
| | - R De Kemp
- University of Ottawa Heart Institute, Ottawa, Canada
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Jiang LY, Jiang W, Tian N, Xiong YN, Liu J, Wei J, Wu KY, Luo J, Shi XJ, Song BL. Ring finger protein 145 (RNF145) is a ubiquitin ligase for sterol-induced degradation of HMG-CoA reductase. J Biol Chem 2018; 293:4047-4055. [PMID: 29374057 PMCID: PMC5857978 DOI: 10.1074/jbc.ra117.001260] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 01/15/2018] [Indexed: 12/21/2022] Open
Abstract
Cholesterol biosynthesis is tightly regulated in the cell. For example, high sterol concentrations can stimulate degradation of the rate-limiting cholesterol biosynthetic enzyme 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMG-CoA reductase, HMGCR). HMGCR is broken down by the endoplasmic reticulum membrane-associated protein complexes consisting of insulin-induced genes (Insigs) and the E3 ubiquitin ligase gp78. Here we found that HMGCR degradation is partially blunted in Chinese hamster ovary (CHO) cells lacking gp78 (gp78-KO). To identify other ubiquitin ligase(s) that may function together with gp78 in triggering HMGCR degradation, we performed a small-scale short hairpin RNA-based screening targeting endoplasmic reticulum-localized E3s. We found that knockdown of both ring finger protein 145 (Rnf145) and gp78 genes abrogates sterol-induced degradation of HMGCR in CHO cells. We also observed that RNF145 interacts with Insig-1 and -2 proteins and ubiquitinates HMGCR. Moreover, the tetrapeptide sequence YLYF in the sterol-sensing domain and the Cys-537 residue in the RING finger domain were essential for RNF145 binding to Insigs and RNF145 E3 activity, respectively. Of note, amino acid substitutions in the YLYF or of Cys-537 completely abolished RNF145-mediated HMGCR degradation. In summary, our study reveals that RNF145, along with gp78, promotes HMGCR degradation in response to elevated sterol levels and identifies residues essential for RNF145 function.
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Affiliation(s)
- Lu-Yi Jiang
- From the Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Wei Jiang
- From the Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Na Tian
- From the Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Yan-Ni Xiong
- From the Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Jie Liu
- From the Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Jian Wei
- From the Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Kai-Yue Wu
- From the Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Jie Luo
- From the Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Xiong-Jie Shi
- From the Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Bao-Liang Song
- From the Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
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Wu KY, Xu CJ, Chi YT, Sun XJ, Wang HF. [Detection of Dickkopf-1 and alkaline phosphatase activity in gingival crevicular fluid from chronic periodontitis with Er:YAG laser as an adjunctive treatment]. Shanghai Kou Qiang Yi Xue 2017; 26:285-289. [PMID: 29098247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
PURPOSE The aim of this study was to evaluate the clinical efficacy and the level of DKK1 and alkaline phosphatase (ALP) activity in gingival crevicular fluid (GCF) while taking Er:YAG laser as an adjunctive to scaling and root planning in the treatment of chronic periodontitis (CP). METHODS Eleven patients with CP were included and there were nineteen pairs of homonym teeth(thirty-eight teeth) in this split-mouth design, and they were randomly assigned to experimental group or control group. In the experimental group, a combination of ultrasonic subgingigval scaling and root planning with hand instrument (SRP) were performed with Er: YAG laser as an adjunctive; in the control group, only SRP was performed. The main variables were bleeding index (BI), probing depth (PD), clinical attachment loss (CAL) which were assessed at baseline (1 week after ultrasonic subgingival scaling), l month and 3 months after treatment. GCF was collected at baseline, l week, l month and 3 months, and the levels of DKK1 and ALP activity were detected at the same time point. The data were analyzed with SPSS 19.0 software package. RESULTS Both groups showed significant reduction of PD, CAL, BI values 1 month and 3months after treatment, but no significant difference in clinical parameters were found between the two groups. In the experimental group, the activity of ALP reduced to (386.69±146.42), (341.221±171.62), (249.27±98.72) from (396.191±150.55) U/L and the level of DKK1 dropped to (310.34±184.68), (270.04±55.14), (247.31±56.99) from (307.12±45.63) μg/L at the end of 1 week, 1 month, 3 months, respectively. Meanwhile, in the control group, the activity of ALP reduced to (374.72±131.27), (344.42±127.80), (252.36±90.4 ) from (394.09±120.25) U/L and the level of DKK1 dropped to (310.34±84.68), (270.04±55.14), (247.31±56.99) from (305.33±147.40) μg/L at the end of l week, l month, 3months, respectively. There is no significant difference between the two groups at any period for ALP or DKK1. CONCLUSIONS Er:YAG laser was a safe no-surgical adjunctive therapy in treating chronic periodontitis, further observation is needed to determine its long-term effectiveness.
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Affiliation(s)
- Kai-Yue Wu
- Center of Stomatology, Xiangya Hospital, Central South University. Changsha 410008, Hunan Province, China. E-mail:
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Zhao RJ, Guo FF, Ma YH, Wu KY, Zhao YW, Kong LF. [Superficial cervicovaginal myofibroblastoma: a clinicopathologic analysis of 6 cases]. Zhonghua Bing Li Xue Za Zhi 2016; 45:793-794. [PMID: 27821236 DOI: 10.3760/cma.j.issn.0529-5807.2016.11.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
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Zhang T, Wu KY, Duan ZY, Lin Y, Gui BS, Liu D, Li K. C5a Receptor Antagonist Protects Mice from Uropathogenic Escherichia Coli-Induced Kidney Infection. Value Health 2014; 17:A811. [PMID: 27203066 DOI: 10.1016/j.jval.2014.08.554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- T Zhang
- The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - K Y Wu
- The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Z Y Duan
- The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - Y Lin
- The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - B S Gui
- The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
| | - D Liu
- The Fifth Hospital of Xi'an, Xi'an, China
| | - K Li
- The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
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Accardo L, Aguilar M, Aisa D, Alpat B, Alvino A, Ambrosi G, Andeen K, Arruda L, Attig N, Azzarello P, Bachlechner A, Barao F, Barrau A, Barrin L, Bartoloni A, Basara L, Battarbee M, Battiston R, Bazo J, Becker U, Behlmann M, Beischer B, Berdugo J, Bertucci B, Bigongiari G, Bindi V, Bizzaglia S, Bizzarri M, Boella G, de Boer W, Bollweg K, Bonnivard V, Borgia B, Borsini S, Boschini MJ, Bourquin M, Burger J, Cadoux F, Cai XD, Capell M, Caroff S, Carosi G, Casaus J, Cascioli V, Castellini G, Cernuda I, Cerreta D, Cervelli F, Chae MJ, Chang YH, Chen AI, Chen H, Cheng GM, Chen HS, Cheng L, Chikanian A, Chou HY, Choumilov E, Choutko V, Chung CH, Cindolo F, Clark C, Clavero R, Coignet G, Consolandi C, Contin A, Corti C, Coste B, Cui Z, Dai M, Delgado C, Della Torre S, Demirköz MB, Derome L, Di Falco S, Di Masso L, Dimiccoli F, Díaz C, von Doetinchem P, Du WJ, Duranti M, D'Urso D, Eline A, Eppling FJ, Eronen T, Fan YY, Farnesini L, Feng J, Fiandrini E, Fiasson A, Finch E, Fisher P, Galaktionov Y, Gallucci G, García B, García-López R, Gast H, Gebauer I, Gervasi M, Ghelfi A, Gillard W, Giovacchini F, Goglov P, Gong J, Goy C, Grabski V, Grandi D, Graziani M, Guandalini C, Guerri I, Guo KH, Haas D, Habiby M, Haino S, Han KC, He ZH, Heil M, Henning R, Hoffman J, Hsieh TH, Huang ZC, Huh C, Incagli M, Ionica M, Jang WY, Jinchi H, Kanishev K, Kim GN, Kim KS, Kirn T, Kossakowski R, Kounina O, Kounine A, Koutsenko V, Krafczyk MS, Kunz S, La Vacca G, Laudi E, Laurenti G, Lazzizzera I, Lebedev A, Lee HT, Lee SC, Leluc C, Levi G, Li HL, Li JQ, Li Q, Li Q, Li TX, Li W, Li Y, Li ZH, Li ZY, Lim S, Lin CH, Lipari P, Lippert T, Liu D, Liu H, Lolli M, Lomtadze T, Lu MJ, Lu YS, Luebelsmeyer K, Luo F, Luo JZ, Lv SS, Majka R, Malinin A, Mañá C, Marín J, Martin T, Martínez G, Masi N, Massera F, Maurin D, Menchaca-Rocha A, Meng Q, Mo DC, Monreal B, Morescalchi L, Mott P, Müller M, Ni JQ, Nikonov N, Nozzoli F, Nunes P, Obermeier A, Oliva A, Orcinha M, Palmonari F, Palomares C, Paniccia M, Papi A, Pauluzzi M, Pedreschi E, Pensotti S, Pereira R, Pilastrini R, Pilo F, Piluso A, Pizzolotto C, Plyaskin V, Pohl M, Poireau V, Postaci E, Putze A, Quadrani L, Qi XM, Rancoita PG, Rapin D, Ricol JS, Rodríguez I, Rosier-Lees S, Rossi L, Rozhkov A, Rozza D, Rybka G, Sagdeev R, Sandweiss J, Saouter P, Sbarra C, Schael S, Schmidt SM, Schuckardt D, Schulz von Dratzig A, Schwering G, Scolieri G, Seo ES, Shan BS, Shan YH, Shi JY, Shi XY, Shi YM, Siedenburg T, Son D, Spada F, Spinella F, Sun W, Sun WH, Tacconi M, Tang CP, Tang XW, Tang ZC, Tao L, Tescaro D, Ting SCC, Ting SM, Tomassetti N, Torsti J, Türkoğlu C, Urban T, Vagelli V, Valente E, Vannini C, Valtonen E, Vaurynovich S, Vecchi M, Velasco M, Vialle JP, Vitale V, Volpini G, Wang LQ, Wang QL, Wang RS, Wang X, Wang ZX, Weng ZL, Whitman K, Wienkenhöver J, Wu H, Wu KY, Xia X, Xie M, Xie S, Xiong RQ, Xin GM, Xu NS, Xu W, Yan Q, Yang J, Yang M, Ye QH, Yi H, Yu YJ, Yu ZQ, Zeissler S, Zhang JH, Zhang MT, Zhang XB, Zhang Z, Zheng ZM, Zhou F, Zhuang HL, Zhukov V, Zichichi A, Zimmermann N, Zuccon P, Zurbach C. High statistics measurement of the positron fraction in primary cosmic rays of 0.5-500 GeV with the alpha magnetic spectrometer on the international space station. Phys Rev Lett 2014; 113:121101. [PMID: 25279616 DOI: 10.1103/physrevlett.113.121101] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Indexed: 06/03/2023]
Abstract
A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show, for the first time, that above ∼200 GeV the positron fraction no longer exhibits an increase with energy.
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Affiliation(s)
- L Accardo
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - M Aguilar
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - D Aisa
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy
| | - B Alpat
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - A Alvino
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - G Ambrosi
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - K Andeen
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB
| | - L Arruda
- Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - N Attig
- Jülich Supercomputing Centre and JARA-FAME, Research Centre Jülich, D-52425 Jülich, GermanyA
| | - P Azzarello
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland and INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - A Bachlechner
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - F Barao
- Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - A Barrau
- Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France
| | - L Barrin
- European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland
| | - A Bartoloni
- INFN-Sezione di Roma 1, I-00185 Roma, Italyx
| | - L Basara
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France and INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx
| | - M Battarbee
- Space Research Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - R Battiston
- INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx
| | - J Bazo
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - U Becker
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Behlmann
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - B Beischer
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - J Berdugo
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - B Bertucci
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy
| | - G Bigongiari
- INFN-Sezione di Pisa, I-56100 Pisa, Italyx and Università di Pisa, I-56100 Pisa, Italy
| | - V Bindi
- Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA
| | - S Bizzaglia
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - M Bizzarri
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy
| | - G Boella
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - W de Boer
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB
| | - K Bollweg
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - V Bonnivard
- Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France
| | - B Borgia
- INFN-Sezione di Roma 1, I-00185 Roma, Italyx and Università di Roma La Sapienza, I-00185 Roma, Italy
| | - S Borsini
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - M J Boschini
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx
| | - M Bourquin
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - J Burger
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - F Cadoux
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - X D Cai
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Capell
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - S Caroff
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - G Carosi
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - J Casaus
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - V Cascioli
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | | | - I Cernuda
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - D Cerreta
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy
| | - F Cervelli
- INFN-Sezione di Pisa, I-56100 Pisa, Italyx
| | - M J Chae
- Department of Physics, Ewha Womans University, Seoul 120-750, KoreaE
| | - Y H Chang
- National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany
| | - A I Chen
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - H Chen
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - G M Cheng
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw
| | - H S Chen
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw
| | - L Cheng
- Shandong University, SDU, Jinan, Shandong 250100, China
| | - A Chikanian
- Physics Department, Yale University, New Haven, Connecticut 06520, USA
| | - H Y Chou
- National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany
| | - E Choumilov
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - V Choutko
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - C H Chung
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - F Cindolo
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - C Clark
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - R Clavero
- Instituto de Astrofísica de Canarias, IAC, E-38205 La Laguna, Tenerife, Spain
| | - G Coignet
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - C Consolandi
- Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA
| | - A Contin
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - C Corti
- Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA
| | - B Coste
- INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx
| | - Z Cui
- Shandong University, SDU, Jinan, Shandong 250100, China
| | - M Dai
- Institute of Electrical Engineering, IEE, Chinese Academy of Sciences, Beijing 100080, China
| | - C Delgado
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - S Della Torre
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx
| | - M B Demirköz
- Department of Physics, Middle East Technical University, METU, 06800 Ankara, Turkeyv
| | - L Derome
- Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France
| | - S Di Falco
- INFN-Sezione di Pisa, I-56100 Pisa, Italyx
| | - L Di Masso
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy
| | - F Dimiccoli
- INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx
| | - C Díaz
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - P von Doetinchem
- Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA
| | - W J Du
- Shandong University, SDU, Jinan, Shandong 250100, China
| | - M Duranti
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - D D'Urso
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - A Eline
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - F J Eppling
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - T Eronen
- Space Research Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - Y Y Fan
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany
| | - L Farnesini
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - J Feng
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - E Fiandrini
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy
| | - A Fiasson
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - E Finch
- Physics Department, Yale University, New Haven, Connecticut 06520, USA
| | - P Fisher
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - Y Galaktionov
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - G Gallucci
- European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and INFN-Sezione di Pisa, I-56100 Pisa, Italyx
| | - B García
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - R García-López
- Instituto de Astrofísica de Canarias, IAC, E-38205 La Laguna, Tenerife, Spain
| | - H Gast
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - I Gebauer
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB
| | - M Gervasi
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - A Ghelfi
- Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France
| | - W Gillard
- National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany
| | - F Giovacchini
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - P Goglov
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - J Gong
- Southeast University, SEU, Nanjing 210096, China
| | - C Goy
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - V Grabski
- Instituto de Física, Universidad Nacional Autónoma de México, UNAM, México D.F. 01000, MéxicoD
| | - D Grandi
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx
| | - M Graziani
- European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - C Guandalini
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - I Guerri
- INFN-Sezione di Pisa, I-56100 Pisa, Italyx and Università di Pisa, I-56100 Pisa, Italy
| | - K H Guo
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - D Haas
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - M Habiby
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - S Haino
- National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany and Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany
| | - K C Han
- National Chung-Shan Institute of Science and Technology, NCSIST, Longtan, Tao Yuan 325, Taiwan
| | - Z H He
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - M Heil
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA and Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB
| | - R Henning
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - J Hoffman
- National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany
| | - T H Hsieh
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - Z C Huang
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - C Huh
- CHEP, Kyungpook National University, 702-701 Daegu, Koreaz
| | - M Incagli
- INFN-Sezione di Pisa, I-56100 Pisa, Italyx
| | - M Ionica
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - W Y Jang
- CHEP, Kyungpook National University, 702-701 Daegu, Koreaz
| | - H Jinchi
- National Chung-Shan Institute of Science and Technology, NCSIST, Longtan, Tao Yuan 325, Taiwan
| | - K Kanishev
- INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx
| | - G N Kim
- CHEP, Kyungpook National University, 702-701 Daegu, Koreaz
| | - K S Kim
- CHEP, Kyungpook National University, 702-701 Daegu, Koreaz
| | - Th Kirn
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - R Kossakowski
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - O Kounina
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - A Kounine
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - V Koutsenko
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M S Krafczyk
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - S Kunz
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB
| | - G La Vacca
- European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx
| | - E Laudi
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy
| | - G Laurenti
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - I Lazzizzera
- INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx
| | - A Lebedev
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - H T Lee
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany
| | - S C Lee
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany
| | - C Leluc
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - G Levi
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - H L Li
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany
| | - J Q Li
- Southeast University, SEU, Nanjing 210096, China
| | - Q Li
- Southeast University, SEU, Nanjing 210096, China
| | - Q Li
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - T X Li
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - W Li
- Beihang University, BUAA, Beijing 100191, China
| | - Y Li
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - Z H Li
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw
| | - Z Y Li
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany
| | - S Lim
- Department of Physics, Ewha Womans University, Seoul 120-750, KoreaE
| | - C H Lin
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany
| | - P Lipari
- INFN-Sezione di Roma 1, I-00185 Roma, Italyx
| | - T Lippert
- Jülich Supercomputing Centre and JARA-FAME, Research Centre Jülich, D-52425 Jülich, GermanyA
| | - D Liu
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany
| | - H Liu
- Southeast University, SEU, Nanjing 210096, China
| | - M Lolli
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - T Lomtadze
- INFN-Sezione di Pisa, I-56100 Pisa, Italyx
| | - M J Lu
- INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx
| | - Y S Lu
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw
| | - K Luebelsmeyer
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - F Luo
- Shandong University, SDU, Jinan, Shandong 250100, China
| | - J Z Luo
- Southeast University, SEU, Nanjing 210096, China
| | - S S Lv
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - R Majka
- Physics Department, Yale University, New Haven, Connecticut 06520, USA
| | - A Malinin
- IPST, University of Maryland, College Park, Maryland 20742, USA
| | - C Mañá
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - J Marín
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - T Martin
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - G Martínez
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - N Masi
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - F Massera
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - D Maurin
- Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France
| | - A Menchaca-Rocha
- Instituto de Física, Universidad Nacional Autónoma de México, UNAM, México D.F. 01000, MéxicoD
| | - Q Meng
- Southeast University, SEU, Nanjing 210096, China
| | - D C Mo
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - B Monreal
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | | | - P Mott
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - M Müller
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - J Q Ni
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - N Nikonov
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB
| | - F Nozzoli
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - P Nunes
- Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - A Obermeier
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - A Oliva
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - M Orcinha
- Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - F Palmonari
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - C Palomares
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - M Paniccia
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - A Papi
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - M Pauluzzi
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy
| | | | - S Pensotti
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - R Pereira
- Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA and Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - R Pilastrini
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - F Pilo
- INFN-Sezione di Pisa, I-56100 Pisa, Italyx
| | - A Piluso
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy
| | - C Pizzolotto
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - V Plyaskin
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Pohl
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - V Poireau
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - E Postaci
- Department of Physics, Middle East Technical University, METU, 06800 Ankara, Turkeyv
| | - A Putze
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - L Quadrani
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - X M Qi
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - P G Rancoita
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx
| | - D Rapin
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - J S Ricol
- Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France
| | - I Rodríguez
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - S Rosier-Lees
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - L Rossi
- European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland
| | - A Rozhkov
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - D Rozza
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx
| | - G Rybka
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - R Sagdeev
- East-West Center for Space Science, University of Maryland, College Park, Maryland 20742, USA
| | - J Sandweiss
- Physics Department, Yale University, New Haven, Connecticut 06520, USA
| | - P Saouter
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - C Sbarra
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - S Schael
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - S M Schmidt
- Jülich Supercomputing Centre and JARA-FAME, Research Centre Jülich, D-52425 Jülich, GermanyA
| | - D Schuckardt
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB
| | - A Schulz von Dratzig
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - G Schwering
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - G Scolieri
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - E S Seo
- IPST, University of Maryland, College Park, Maryland 20742, USA
| | - B S Shan
- Beihang University, BUAA, Beijing 100191, China
| | - Y H Shan
- Beihang University, BUAA, Beijing 100191, China
| | - J Y Shi
- Southeast University, SEU, Nanjing 210096, China
| | - X Y Shi
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - Y M Shi
- Shanghai Jiaotong University, SJTU, Shanghai 200030, China
| | - T Siedenburg
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - D Son
- CHEP, Kyungpook National University, 702-701 Daegu, Koreaz
| | - F Spada
- INFN-Sezione di Roma 1, I-00185 Roma, Italyx
| | - F Spinella
- INFN-Sezione di Pisa, I-56100 Pisa, Italyx
| | - W Sun
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - W H Sun
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Tacconi
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - C P Tang
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - X W Tang
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw
| | - Z C Tang
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw
| | - L Tao
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - D Tescaro
- Instituto de Astrofísica de Canarias, IAC, E-38205 La Laguna, Tenerife, Spain
| | - Samuel C C Ting
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - S M Ting
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - N Tomassetti
- Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France
| | - J Torsti
- Space Research Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - C Türkoğlu
- Department of Physics, Middle East Technical University, METU, 06800 Ankara, Turkeyv
| | - T Urban
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - V Vagelli
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB
| | - E Valente
- INFN-Sezione di Roma 1, I-00185 Roma, Italyx and Università di Roma La Sapienza, I-00185 Roma, Italy
| | - C Vannini
- INFN-Sezione di Pisa, I-56100 Pisa, Italyx
| | - E Valtonen
- Space Research Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - S Vaurynovich
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Vecchi
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - M Velasco
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - J P Vialle
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - V Vitale
- INFN-Sezione di Perugia, I-06100 Perugia, Italyx
| | - G Volpini
- INFN-Sezione di Milano and Università di Milano, I-20090 Milano, Italy
| | - L Q Wang
- Shandong University, SDU, Jinan, Shandong 250100, China
| | - Q L Wang
- Institute of Electrical Engineering, IEE, Chinese Academy of Sciences, Beijing 100080, China
| | - R S Wang
- Shanghai Jiaotong University, SJTU, Shanghai 200030, China
| | - X Wang
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - Z X Wang
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - Z L Weng
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - K Whitman
- Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA
| | - J Wienkenhöver
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - H Wu
- Southeast University, SEU, Nanjing 210096, China
| | - K Y Wu
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany
| | - X Xia
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC
| | - M Xie
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - S Xie
- Shanghai Jiaotong University, SJTU, Shanghai 200030, China
| | - R Q Xiong
- Southeast University, SEU, Nanjing 210096, China
| | - G M Xin
- Shandong University, SDU, Jinan, Shandong 250100, China
| | - N S Xu
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - W Xu
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw and Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - Q Yan
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw
| | - J Yang
- Department of Physics, Ewha Womans University, Seoul 120-750, KoreaE
| | - M Yang
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw
| | - Q H Ye
- Shanghai Jiaotong University, SJTU, Shanghai 200030, China
| | - H Yi
- Southeast University, SEU, Nanjing 210096, China
| | - Y J Yu
- Institute of Electrical Engineering, IEE, Chinese Academy of Sciences, Beijing 100080, China
| | - Z Q Yu
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw
| | - S Zeissler
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB
| | - J H Zhang
- Southeast University, SEU, Nanjing 210096, China
| | - M T Zhang
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - X B Zhang
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - Z Zhang
- Sun Yat-Sen University, SYSU, Guangzhou 510275, China
| | - Z M Zheng
- Beihang University, BUAA, Beijing 100191, China
| | - F Zhou
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - H L Zhuang
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw
| | - V Zhukov
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - A Zichichi
- INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy
| | - N Zimmermann
- I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu
| | - P Zuccon
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - C Zurbach
- Laboratoire Univers et Particules de Montpellier, LUPM, IN2P3/CNRS and Université de Montpellier II, F-34095 Montpellier, France
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11
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Aguilar M, Alberti G, Alpat B, Alvino A, Ambrosi G, Andeen K, Anderhub H, Arruda L, Azzarello P, Bachlechner A, Barao F, Baret B, Barrau A, Barrin L, Bartoloni A, Basara L, Basili A, Batalha L, Bates J, Battiston R, Bazo J, Becker R, Becker U, Behlmann M, Beischer B, Berdugo J, Berges P, Bertucci B, Bigongiari G, Biland A, Bindi V, Bizzaglia S, Boella G, de Boer W, Bollweg K, Bolmont J, Borgia B, Borsini S, Boschini MJ, Boudoul G, Bourquin M, Brun P, Buénerd M, Burger J, Burger W, Cadoux F, Cai XD, Capell M, Casadei D, Casaus J, Cascioli V, Castellini G, Cernuda I, Cervelli F, Chae MJ, Chang YH, Chen AI, Chen CR, Chen H, Cheng GM, Chen HS, Cheng L, Chernoplyiokov N, Chikanian A, Choumilov E, Choutko V, Chung CH, Clark C, Clavero R, Coignet G, Commichau V, Consolandi C, Contin A, Corti C, Costado Dios MT, Coste B, Crespo D, Cui Z, Dai M, Delgado C, Della Torre S, Demirkoz B, Dennett P, Derome L, Di Falco S, Diao XH, Diago A, Djambazov L, Díaz C, von Doetinchem P, Du WJ, Dubois JM, Duperay R, Duranti M, D'Urso D, Egorov A, Eline A, Eppling FJ, Eronen T, van Es J, Esser H, Falvard A, Fiandrini E, Fiasson A, Finch E, Fisher P, Flood K, Foglio R, Fohey M, Fopp S, Fouque N, Galaktionov Y, Gallilee M, Gallin-Martel L, Gallucci G, García B, García J, García-López R, García-Tabares L, Gargiulo C, Gast H, Gebauer I, Gentile S, Gervasi M, Gillard W, Giovacchini F, Girard L, Goglov P, Gong J, Goy-Henningsen C, Grandi D, Graziani M, Grechko A, Gross A, Guerri I, de la Guía C, Guo KH, Habiby M, Haino S, Hauler F, He ZH, Heil M, Heilig J, Hermel R, Hofer H, Huang ZC, Hungerford W, Incagli M, Ionica M, Jacholkowska A, Jang WY, Jinchi H, Jongmanns M, Journet L, Jungermann L, Karpinski W, Kim GN, Kim KS, Kirn T, Kossakowski R, Koulemzine A, Kounina O, Kounine A, Koutsenko V, Krafczyk MS, Laudi E, Laurenti G, Lauritzen C, Lebedev A, Lee MW, Lee SC, Leluc C, León Vargas H, Lepareur V, Li JQ, Li Q, Li TX, Li W, Li ZH, Lipari P, Lin CH, Liu D, Liu H, Lomtadze T, Lu YS, Lucidi S, Lübelsmeyer K, Luo JZ, Lustermann W, Lv S, Madsen J, Majka R, Malinin A, Mañá C, Marín J, Martin T, Martínez G, Masciocchi F, Masi N, Maurin D, McInturff A, McIntyre P, Menchaca-Rocha A, Meng Q, Menichelli M, Mereu I, Millinger M, Mo DC, Molina M, Mott P, Mujunen A, Natale S, Nemeth P, Ni JQ, Nikonov N, Nozzoli F, Nunes P, Obermeier A, Oh S, Oliva A, Palmonari F, Palomares C, Paniccia M, Papi A, Park WH, Pauluzzi M, Pauss F, Pauw A, Pedreschi E, Pensotti S, Pereira R, Perrin E, Pessina G, Pierschel G, Pilo F, Piluso A, Pizzolotto C, Plyaskin V, Pochon J, Pohl M, Poireau V, Porter S, Pouxe J, Putze A, Quadrani L, Qi XN, Rancoita PG, Rapin D, Ren ZL, Ricol JS, Riihonen E, Rodríguez I, Roeser U, Rosier-Lees S, Rossi L, Rozhkov A, Rozza D, Sabellek A, Sagdeev R, Sandweiss J, Santos B, Saouter P, Sarchioni M, Schael S, Schinzel D, Schmanau M, Schwering G, Schulz von Dratzig A, Scolieri G, Seo ES, Shan BS, Shi JY, Shi YM, Siedenburg T, Siedling R, Son D, Spada F, Spinella F, Steuer M, Stiff K, Sun W, Sun WH, Sun XH, Tacconi M, Tang CP, Tang XW, Tang ZC, Tao L, Tassan-Viol J, Ting SCC, Ting SM, Titus C, Tomassetti N, Toral F, Torsti J, Tsai JR, Tutt JC, Ulbricht J, Urban T, Vagelli V, Valente E, Vannini C, Valtonen E, Vargas Trevino M, Vaurynovich S, Vecchi M, Vergain M, Verlaat B, Vescovi C, Vialle JP, Viertel G, Volpini G, Wang D, Wang NH, Wang QL, Wang RS, Wang X, Wang ZX, Wallraff W, Weng ZL, Willenbrock M, Wlochal M, Wu H, Wu KY, Wu ZS, Xiao WJ, Xie S, Xiong RQ, Xin GM, Xu NS, Xu W, Yan Q, Yang J, Yang M, Ye QH, Yi H, Yu YJ, Yu ZQ, Zeissler S, Zhang JG, Zhang Z, Zhang MM, Zheng ZM, Zhuang HL, Zhukov V, Zichichi A, Zuccon P, Zurbach C. First result from the Alpha Magnetic Spectrometer on the International Space Station: precision measurement of the positron fraction in primary cosmic rays of 0.5-350 GeV. Phys Rev Lett 2013; 110:141102. [PMID: 25166975 DOI: 10.1103/physrevlett.110.141102] [Citation(s) in RCA: 123] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Indexed: 06/03/2023]
Abstract
A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 × 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to ∼ 250 GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. The positron fraction spectrum shows no fine structure, and the positron to electron ratio shows no observable anisotropy. Together, these features show the existence of new physical phenomena.
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Affiliation(s)
- M Aguilar
- European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - G Alberti
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - B Alpat
- INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - A Alvino
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - G Ambrosi
- INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - K Andeen
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - H Anderhub
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - L Arruda
- Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - P Azzarello
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland and INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - A Bachlechner
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - F Barao
- Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - B Baret
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - A Barrau
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - L Barrin
- European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland
| | | | - L Basara
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - A Basili
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - L Batalha
- Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - J Bates
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - R Battiston
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy and INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italy
| | - J Bazo
- INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - R Becker
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - U Becker
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Behlmann
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - B Beischer
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - J Berdugo
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - P Berges
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - B Bertucci
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - G Bigongiari
- INFN-Sezione di Pisa, I-56100 Pisa, Italy and Università di Pisa, I-56100 Pisa, Italy
| | - A Biland
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - V Bindi
- University of Hawaii, Physics and Astronomy Department, 2505 Correa Road, WAT 432; Honolulu, Hawaii 96822, USA
| | - S Bizzaglia
- INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - G Boella
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - W de Boer
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - K Bollweg
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - J Bolmont
- Laboratoire Univers et Particules de Montpellier, LUPM (ex LPTA), IN2P3/CNRS and Université de Montpellier II, F-34095 Montpellier, France
| | - B Borgia
- INFN-Sezione di Roma 1, I-00185 Roma, Italy and Università di Roma La Sapienza, I-00185 Roma, Italy
| | - S Borsini
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - M J Boschini
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy
| | - G Boudoul
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - M Bourquin
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - P Brun
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - M Buénerd
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - J Burger
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - W Burger
- Università di Perugia, I-06100 Perugia, Italy
| | - F Cadoux
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France and DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - X D Cai
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Capell
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - D Casadei
- INFN-Sezione di Bologna, I-40126 Bologna, Italy and Università di Bologna, I-40126 Bologna, Italy
| | - J Casaus
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - V Cascioli
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | | | - I Cernuda
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - F Cervelli
- INFN-Sezione di Pisa, I-56100 Pisa, Italy
| | - M J Chae
- Department of Physics, Ewha Womans University, Seoul, 120-750, Korea
| | - Y H Chang
- National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwan
| | - A I Chen
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - C R Chen
- National Space Organization, Hsin-Chu City, 300, Taiwan
| | - H Chen
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - G M Cheng
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - H S Chen
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - L Cheng
- Shandong University, SDU, Jinan, Shandong, 250100, China
| | - N Chernoplyiokov
- Kurchatov Institute, Russian Research Centre, Moscow, 123182, Russia
| | - A Chikanian
- Physics Department, Yale University, New Haven, Connecticut 06520, USA
| | - E Choumilov
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - V Choutko
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - C H Chung
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - C Clark
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - R Clavero
- Instituto de Astrofísica de Canarias, IAC, E-38205, La Laguna, Tenerife, Spain
| | - G Coignet
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - V Commichau
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - C Consolandi
- University of Hawaii, Physics and Astronomy Department, 2505 Correa Road, WAT 432; Honolulu, Hawaii 96822, USA and INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy
| | - A Contin
- INFN-Sezione di Bologna, I-40126 Bologna, Italy and Università di Bologna, I-40126 Bologna, Italy
| | - C Corti
- University of Hawaii, Physics and Astronomy Department, 2505 Correa Road, WAT 432; Honolulu, Hawaii 96822, USA
| | - M T Costado Dios
- Instituto de Astrofísica de Canarias, IAC, E-38205, La Laguna, Tenerife, Spain
| | - B Coste
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - D Crespo
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - Z Cui
- Shandong University, SDU, Jinan, Shandong, 250100, China
| | - M Dai
- Institute of Electrical Engineering, IEE, Chinese Academy of Sciences, Beijing, 100080, China
| | - C Delgado
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - S Della Torre
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - B Demirkoz
- Department of Physics, Middle East Technical University, METU, 06800 Ankara, Turkey
| | - P Dennett
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - L Derome
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - S Di Falco
- INFN-Sezione di Pisa, I-56100 Pisa, Italy
| | - X H Diao
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - A Diago
- Instituto de Astrofísica de Canarias, IAC, E-38205, La Laguna, Tenerife, Spain
| | - L Djambazov
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - C Díaz
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | | | - W J Du
- Shandong University, SDU, Jinan, Shandong, 250100, China
| | - J M Dubois
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - R Duperay
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - M Duranti
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - D D'Urso
- European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - A Egorov
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - A Eline
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - F J Eppling
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - T Eronen
- Space Research Laboratory, Department of Physics, University of Turku, FIN-20014 Turku, Finland
| | - J van Es
- National Aerospace Laboratory, NLR, NL-8300 AD Emmeloord, Netherlands
| | - H Esser
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - A Falvard
- Laboratoire Univers et Particules de Montpellier, LUPM (ex LPTA), IN2P3/CNRS and Université de Montpellier II, F-34095 Montpellier, France
| | - E Fiandrini
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - A Fiasson
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - E Finch
- Physics Department, Yale University, New Haven, Connecticut 06520, USA
| | - P Fisher
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - K Flood
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - R Foglio
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - M Fohey
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - S Fopp
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - N Fouque
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - Y Galaktionov
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Gallilee
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - L Gallin-Martel
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - G Gallucci
- INFN-Sezione di Pisa, I-56100 Pisa, Italy
| | - B García
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - J García
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - R García-López
- Instituto de Astrofísica de Canarias, IAC, E-38205, La Laguna, Tenerife, Spain
| | - L García-Tabares
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - C Gargiulo
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA and INFN-Sezione di Roma 1, I-00185 Roma, Italy
| | - H Gast
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - I Gebauer
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - S Gentile
- INFN-Sezione di Roma 1, I-00185 Roma, Italy and Università di Roma La Sapienza, I-00185 Roma, Italy
| | - M Gervasi
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - W Gillard
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - F Giovacchini
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - L Girard
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - P Goglov
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - J Gong
- Southeast University, SEU, Nanjing, 210096, China
| | - C Goy-Henningsen
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - D Grandi
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy
| | - M Graziani
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - A Grechko
- Kurchatov Institute, Russian Research Centre, Moscow, 123182, Russia
| | - A Gross
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - I Guerri
- INFN-Sezione di Pisa, I-56100 Pisa, Italy and Università di Pisa, I-56100 Pisa, Italy
| | - C de la Guía
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - K H Guo
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - M Habiby
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - S Haino
- National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwan and INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - F Hauler
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - Z H He
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - M Heil
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - J Heilig
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - R Hermel
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - H Hofer
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Z C Huang
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - W Hungerford
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA and NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - M Incagli
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA and INFN-Sezione di Pisa, I-56100 Pisa, Italy
| | - M Ionica
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - A Jacholkowska
- Laboratoire Univers et Particules de Montpellier, LUPM (ex LPTA), IN2P3/CNRS and Université de Montpellier II, F-34095 Montpellier, France
| | - W Y Jang
- CHEP, Kyungpook National University, 702-701 Daegu, Korea
| | - H Jinchi
- Chung-Shan Institute of Science and Technology, Lung-Tan, Tao Yuan 325, Taiwan
| | - M Jongmanns
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - L Journet
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - L Jungermann
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - W Karpinski
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - G N Kim
- CHEP, Kyungpook National University, 702-701 Daegu, Korea
| | - K S Kim
- CHEP, Kyungpook National University, 702-701 Daegu, Korea
| | - Th Kirn
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - R Kossakowski
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - A Koulemzine
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - O Kounina
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - A Kounine
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - V Koutsenko
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M S Krafczyk
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - E Laudi
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - G Laurenti
- INFN-Sezione di Bologna, I-40126 Bologna, Italy
| | - C Lauritzen
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - A Lebedev
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M W Lee
- CHEP, Kyungpook National University, 702-701 Daegu, Korea
| | - S C Lee
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
| | - C Leluc
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - H León Vargas
- Instituto de Física, Universidad Nacional Autónoma de México, UNAM, México, D. F., 01000 México
| | - V Lepareur
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - J Q Li
- Southeast University, SEU, Nanjing, 210096, China
| | - Q Li
- Southeast University, SEU, Nanjing, 210096, China
| | - T X Li
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - W Li
- Beihang University, BUAA, Beijing, 100191, China
| | - Z H Li
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - P Lipari
- INFN-Sezione di Roma 1, I-00185 Roma, Italy
| | - C H Lin
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
| | - D Liu
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
| | - H Liu
- Southeast University, SEU, Nanjing, 210096, China
| | - T Lomtadze
- INFN-Sezione di Pisa, I-56100 Pisa, Italy
| | - Y S Lu
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - S Lucidi
- INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - K Lübelsmeyer
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - J Z Luo
- Southeast University, SEU, Nanjing, 210096, China
| | - W Lustermann
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - S Lv
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - J Madsen
- Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark
| | - R Majka
- Physics Department, Yale University, New Haven, Connecticut 06520, USA
| | - A Malinin
- IPST, University of Maryland, College Park, Maryland 20742, USA
| | - C Mañá
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - J Marín
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - T Martin
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - G Martínez
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - F Masciocchi
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - N Masi
- INFN-Sezione di Bologna, I-40126 Bologna, Italy and Università di Bologna, I-40126 Bologna, Italy
| | - D Maurin
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - A McInturff
- Department of Physics, Texas A&M University, College Station, Texas 77843, USA
| | - P McIntyre
- Department of Physics, Texas A&M University, College Station, Texas 77843, USA
| | - A Menchaca-Rocha
- Instituto de Física, Universidad Nacional Autónoma de México, UNAM, México, D. F., 01000 México
| | - Q Meng
- Southeast University, SEU, Nanjing, 210096, China
| | | | - I Mereu
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - M Millinger
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - D C Mo
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - M Molina
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany and Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark and National Institute for Nuclear Physics and High Energy Physics, NIKHEF, NL-1098 SJ Amsterdam, Netherlands and Department of Physics, Middle East Technical University, METU, 06800 Ankara, Turkey and Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France and Beihang University, BUAA, Beijing, 100191, China and Institute of Electrical Engineering, IEE, Chinese Academy of Sciences, Beijing, 100080, China and Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China and INFN-Sezione di Bologna, I-40126 Bologna, Italy and Università di Bologna, I-40126 Bologna, Italy and Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA and National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwan and East-West Center for Space Science, University of Maryland, College Park, Maryland 20742, USA and IPST, University of Maryland, College Park, Maryland 20742, USA and Department of Physics, Texas A&M University, College Station, Texas 77843, USA and CHEP, Kyungpook National University, 702-701 Daegu, Korea and National Aerospace Laboratory, NLR, NL-8300 AD Emmeloord, Netherlands and CNR-IROE, I-50125 Firenze, Italy and ASDC ESRIN, I-00044 Frascati, Italy and European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and DPNC, Université de Genève, CH-1211 Genève 4, Switzerland and Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France and Sun Yat-sen University, SYSU, Guangzhou, 510275, China and University of Hawaii, Physics and Astronomy Department, 2505 Correa Road, WAT 432; Honolulu, Hawaii 96822, USA and NASA, National Aeronautics and Space Administration, Johnson Space Center
| | - P Mott
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - A Mujunen
- Metsahovi Radio Observatory, Helsinki University of Technology, FIN-02540 Kylmala, Finland
| | - S Natale
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany and Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
| | - P Nemeth
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - J Q Ni
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - N Nikonov
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - F Nozzoli
- ASDC ESRIN, I-00044 Frascati, Italy and INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - P Nunes
- Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - A Obermeier
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - S Oh
- Department of Physics, Ewha Womans University, Seoul, 120-750, Korea
| | - A Oliva
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain and INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - F Palmonari
- INFN-Sezione di Bologna, I-40126 Bologna, Italy and Università di Bologna, I-40126 Bologna, Italy
| | - C Palomares
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - M Paniccia
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France and DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - A Papi
- INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - W H Park
- CHEP, Kyungpook National University, 702-701 Daegu, Korea
| | - M Pauluzzi
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - F Pauss
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - A Pauw
- National Aerospace Laboratory, NLR, NL-8300 AD Emmeloord, Netherlands
| | | | - S Pensotti
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - R Pereira
- Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - E Perrin
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - G Pessina
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - G Pierschel
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - F Pilo
- INFN-Sezione di Pisa, I-56100 Pisa, Italy
| | - A Piluso
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - C Pizzolotto
- ASDC ESRIN, I-00044 Frascati, Italy and INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - V Plyaskin
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - J Pochon
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France and Instituto de Astrofísica de Canarias, IAC, E-38205, La Laguna, Tenerife, Spain
| | - M Pohl
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - V Poireau
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - S Porter
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - J Pouxe
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - A Putze
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - L Quadrani
- INFN-Sezione di Bologna, I-40126 Bologna, Italy and Università di Bologna, I-40126 Bologna, Italy
| | - X N Qi
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - P G Rancoita
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy
| | - D Rapin
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - Z L Ren
- Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
| | - J S Ricol
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - E Riihonen
- Space Research Laboratory, Department of Physics, University of Turku, FIN-20014 Turku, Finland
| | - I Rodríguez
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - U Roeser
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - S Rosier-Lees
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - L Rossi
- European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and Università di Milano, I-20090 Milano, Italy
| | - A Rozhkov
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - D Rozza
- European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - A Sabellek
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - R Sagdeev
- East-West Center for Space Science, University of Maryland, College Park, Maryland 20742, USA
| | - J Sandweiss
- Physics Department, Yale University, New Haven, Connecticut 06520, USA
| | - B Santos
- Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal
| | - P Saouter
- DPNC, Université de Genève, CH-1211 Genève 4, Switzerland
| | - M Sarchioni
- INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - S Schael
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - D Schinzel
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Schmanau
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - G Schwering
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | | | - G Scolieri
- INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - E S Seo
- IPST, University of Maryland, College Park, Maryland 20742, USA
| | - B S Shan
- Beihang University, BUAA, Beijing, 100191, China
| | - J Y Shi
- Southeast University, SEU, Nanjing, 210096, China
| | - Y M Shi
- Shanghai Jiaotong University, SJTU, Shanghai, 200030, China
| | - T Siedenburg
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - R Siedling
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - D Son
- CHEP, Kyungpook National University, 702-701 Daegu, Korea
| | - F Spada
- INFN-Sezione di Roma 1, I-00185 Roma, Italy
| | - F Spinella
- INFN-Sezione di Pisa, I-56100 Pisa, Italy
| | - M Steuer
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - K Stiff
- Department of Physics, Texas A&M University, College Station, Texas 77843, USA
| | - W Sun
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - W H Sun
- Southeast University, SEU, Nanjing, 210096, China
| | - X H Sun
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - M Tacconi
- INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy and Università di Milano-Bicocca, I-20126 Milano, Italy
| | - C P Tang
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - X W Tang
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - Z C Tang
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - L Tao
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - J Tassan-Viol
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - Samuel C C Ting
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - S M Ting
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - C Titus
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - N Tomassetti
- INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy
| | - F Toral
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain
| | - J Torsti
- Space Research Laboratory, Department of Physics, University of Turku, FIN-20014 Turku, Finland
| | - J R Tsai
- National Space Organization, Hsin-Chu City, 300, Taiwan
| | - J C Tutt
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - J Ulbricht
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - T Urban
- NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA
| | - V Vagelli
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - E Valente
- INFN-Sezione di Roma 1, I-00185 Roma, Italy
| | - C Vannini
- INFN-Sezione di Pisa, I-56100 Pisa, Italy
| | - E Valtonen
- Space Research Laboratory, Department of Physics, University of Turku, FIN-20014 Turku, Finland
| | - M Vargas Trevino
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - S Vaurynovich
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Vecchi
- National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwan
| | - M Vergain
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - B Verlaat
- National Institute for Nuclear Physics and High Energy Physics, NIKHEF, NL-1098 SJ Amsterdam, Netherlands
| | - C Vescovi
- Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France
| | - J P Vialle
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France
| | - G Viertel
- Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - G Volpini
- INFN-Sezione di Milano, I-20090 Milano, Italy and Università di Milano, I-20090 Milano, Italy
| | - D Wang
- National Space Organization, Hsin-Chu City, 300, Taiwan
| | - N H Wang
- Shandong University, SDU, Jinan, Shandong, 250100, China
| | - Q L Wang
- Institute of Electrical Engineering, IEE, Chinese Academy of Sciences, Beijing, 100080, China
| | - R S Wang
- Shanghai Jiaotong University, SJTU, Shanghai, 200030, China
| | - X Wang
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - Z X Wang
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - W Wallraff
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - Z L Weng
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China and Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
| | - M Willenbrock
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA
| | - M Wlochal
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - H Wu
- Southeast University, SEU, Nanjing, 210096, China
| | - K Y Wu
- Beihang University, BUAA, Beijing, 100191, China and Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
| | - Z S Wu
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - W J Xiao
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - S Xie
- Shanghai Jiaotong University, SJTU, Shanghai, 200030, China
| | - R Q Xiong
- Southeast University, SEU, Nanjing, 210096, China
| | - G M Xin
- Shandong University, SDU, Jinan, Shandong, 250100, China
| | - N S Xu
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - W Xu
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - Q Yan
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - J Yang
- Department of Physics, Ewha Womans University, Seoul, 120-750, Korea
| | - M Yang
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - Q H Ye
- Shanghai Jiaotong University, SJTU, Shanghai, 200030, China
| | - H Yi
- Southeast University, SEU, Nanjing, 210096, China
| | - Y J Yu
- Institute of Electrical Engineering, IEE, Chinese Academy of Sciences, Beijing, 100080, China
| | - Z Q Yu
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - S Zeissler
- Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany
| | - J G Zhang
- Southeast University, SEU, Nanjing, 210096, China
| | - Z Zhang
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - M M Zhang
- Sun Yat-sen University, SYSU, Guangzhou, 510275, China
| | - Z M Zheng
- Beihang University, BUAA, Beijing, 100191, China
| | - H L Zhuang
- Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing, 100039, China
| | - V Zhukov
- I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany
| | - A Zichichi
- INFN-Sezione di Bologna, I-40126 Bologna, Italy and Università di Bologna, I-40126 Bologna, Italy
| | - P Zuccon
- Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA and INFN-Sezione di Perugia, I-06100 Perugia, Italy
| | - C Zurbach
- Laboratoire Univers et Particules de Montpellier, LUPM (ex LPTA), IN2P3/CNRS and Université de Montpellier II, F-34095 Montpellier, France
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12
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AbdulAlmohsin S, Mohammed M, Li Z, Thomas MA, Wu KY, Cui JB. Multi-walled carbon nanotubes as a new counter electrode for dye-sensitized solar cells. J Nanosci Nanotechnol 2012; 12:2374-2379. [PMID: 22755061 DOI: 10.1166/jnn.2012.5682] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Airbrushed multi-walled carbon nanotube (MWNT) networks were investigated as a new counter electrode for dye-sensitized TiO2 photoelectrochemical solar cells. The structural and physical properties of the MWNTs were studied by various techniques including SEM, TEM, Raman, optical absorption, and electrochemical impedance spectroscopy (EIS). The MWNTs exhibited catalytic activity for the reduction of triiodide in the electrolyte as studied by EIS measurements. The performance of the dye-sensitized solar cells was improved by using MWNTs as counter electrodes. This observation is explained by the significantly increased contact area between the MWNT counter electrode and the electrolyte which facilitates efficient charge transportation in the solar cell. We demonstrated that the MWNTs are suitable for replacing expensive Pt electrodes for fabricating high efficiency dye-sensitized solar cells. The process used in this study is also technically attractive for large scale and economic production.
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Affiliation(s)
- S AbdulAlmohsin
- Department of Physics and Astronomy, University of Arkansas at Little Rock, AR 72204, USA
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13
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Abstract
A new cell immobilization technique is described in which polyvinyl alcohol is crosslinked with boric acid, with the addition of a small amount of calcium alginate. The presence of the calcium alginate improves the surface properties of the beads, preventing agglomeration. A pure culture of phenol-degrading Pseudomonas was immobilized in the PVA-alginate beads. Phenol was successfully degraded in a fluidized bed of the beads, indicating that cell viability was maintained following the immobilization procedure. The PVA-alginate beads proved to be very strong and durable, with no noticeable degradation of the beads after 2 weeks of continuous operation of the fluidized bed.
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Affiliation(s)
- K Y Wu
- Department of Chemical Engineering, The University of Tulsa, Tulsa, Oklahoma 74104, USA
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14
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Wang IJ, Wu YN, Wu WC, Leonardi G, Sung YJ, Lin TJ, Wang CL, Kuo CF, Wu KY, Cheng WC, Chan CC, Chen PC, Lin SL. The association of clinical findings and exposure profiles with melamine associated nephrolithiasis. Arch Dis Child 2009; 94:883-7. [PMID: 19608552 DOI: 10.1136/adc.2009.163477] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Little is known about the exposure profiles of melamine in children. We evaluated the association of clinical findings, exposure patterns and biomarkers with nephrolithiasis in children with potential exposure to melamine. METHODS A case-control study was conducted in children aged 0-16 years with potential exposure to contaminated dairy products. Cases were defined as nephrolithiasis detected by renal ultrasonography. On the basis of different brands of contaminated dairy products consumed, subjects were classified into high exposure, low exposure and control groups with estimated melamine exposure levels of higher than 2.5 ppm, 0.05-2.5 ppm and lower than detection limits <0.05 ppm. We measured urine melamine for those with nephrolithiasis and age-matched and gender-matched controls within the subset of the study population. RESULTS The duration of consumption of contaminated products was longer in children with nephrolithiasis in the high exposure group than in controls (median (IQR) 12.0 (3.3-24.0) vs 6.0 (4.0-7.0) months; p = 0.048). High melamine exposure levels were significantly associated with nephrolithiasis (OR 61.04 (95% CI 12.73 to 292.84)). The risk was found to increase with estimate melamine exposure levels (p for trend <0.001). Two among 10 affected subjects with nephrolithiasis showed elevated urine melamine levels. In comparison, levels of all 20 controls were lower than the detection limit. CONCLUSIONS The risk of melamine-associated nephrolithiasis was related to duration of consumption of contaminated products and estimated melamine exposure levels. Though urine melamine was not a sensitive test, it might serve as an exposure biomarker in melamine-associated nephrolithiasis.
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Affiliation(s)
- I J Wang
- Department of Pediatrics,Taipei Hospital, Taipei, Taiwan
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15
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Kuo HW, Chang SF, Wu KY, Wu FY. Chromium (VI) induced oxidative damage to DNA: increase of urinary 8-hydroxydeoxyguanosine concentrations (8-OHdG) among electroplating workers. Occup Environ Med 2003; 60:590-4. [PMID: 12883020 PMCID: PMC1740592 DOI: 10.1136/oem.60.8.590] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIMS To investigate the concentration of urinary 8-hydroxydeoxyguanosine (8-OHdG) among electroplating workers in Taiwan. METHODS Fifty workers were selected from five chromium (Cr) electroplating plants in central Taiwan. The 20 control subjects were office workers with no previous exposure to Cr. Urinary 8-OHdG concentrations were determined using high performance liquid chromatography with electrochemical detection. RESULTS Urinary 8-OHdG concentrations among Cr workers (1149.5 pmol/kg/day) were higher than those in the control group (730.2 pmol/kg/day). There was a positive correlation between urinary 8-OHdG concentrations and urinary Cr concentration (r = 0.447, p < 0.01), and urinary 8-OHdG correlated positively with airborne Cr concentration (r = 0.285). Using multiple regression analysis, the factors that affected urinary 8-OHdG concentrations were alcohol, the common cold, and high urinary Cr concentration. There was a high correlation of urinary 8-OHdG with both smoking and drinking, but multiple regression analysis showed that smoking was not a significant factor. Age and gender were also non-significant factors. CONCLUSION 8-OHdG, which is an indicator of oxidative DNA damage, was a sensitive biomarker for Cr exposure.
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Affiliation(s)
- H W Kuo
- Institute of Environmental Health, China Medical College, Taichung,Taiwan, ROC.
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Abstract
The effect of endothelin-1 (ET-1) on corneal cells is not well understood. We investigated the biochemical changes of cultured porcine corneal keratocytes under exposure to ET-1. The results indicate that ET-1 has remarkable effects to inhibit corneal keratocytes on 3H-thymidine, 3H-leucine, 3H-uridine uptakes and cellular migration. It is in a dose-dependent manner at concentrations ranging from 10(-7) M to 10(-9) M. The 50% inhibitory dose (ID50) for ET-1, as measured by 3H-thymidine uptake, 3H-uridine uptake and 3H-leucine uptake, were 10(-7) M, 10(-0.52) M and 10(-11.8) M, respectively. The dead and living cells were estimated with MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide) assay that was converted tetrazolium dye of living cells only into insoluble purple formazan crystals within mitochondria. In the presence of ET-1, the cellular MTT values were also decreased. The ID50 for ET-1 with cell migration assay and MTT assay were measured at 10(-7.86) M and 10(-5.1) M. Endothelin-1 (10(-6) M) promptly changed cellular morphology and attenuated adhesion observed with laser scanning cytometer. Endothelin-1-induced characteristic apoptosis cells were observed using a TUNEL assay that detected fragmented DNA of apoptosis. Western blot assay revealed that endothelin-1 induced proteolysis and decreased in fibronectin protein. These findings indicate that endothelin-1 may lead keratocytes to death resulting from induction of apoptosis and functional loss.
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Affiliation(s)
- K Y Wu
- Department of Ophthalmology, Kaohsiung Medical University, Taiwan, Republic of China.
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17
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Lin HY, Wu KY. Tentative surgical repair of leaking filtering bleb with amniotic membrane transplantation--a case report. Kaohsiung J Med Sci 2001; 17:495-8. [PMID: 11842654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
To repair a traumatic leaking cystic bleb in a 50-year-old male patient who had received multiple glaucoma filtering surgeries with the application of mitomycin-C, an amniotic membrane covered over the leaking bleb and sutured it to the adjacent conjunctiva with 10-0 nylon was done. The anterior chamber gradually formed after the amniotic membrane transplantation (AMT) and intraocular pressure returned to the level before trauma. Three weeks after the operation, the amniotic membrane was removed. No more leakage from the bleb was observed during four months follow-up. However, another bleb revision surgery was performed later to repair recurrent bleb leakage. Although conjunctival advancement or free conjunctival autograft have been reported to repair leaking bleb successfully, the simple primary method of using AMT is still encouraged in repair of a ruptured bleb with tentative maintenance of adequate filtration.
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Affiliation(s)
- H Y Lin
- Department of Ophthalmology, College of Medicine, Kaohsiung Medical University, No. 100, Shih-Chuan 1st Rd., 807, Kaohsiung, Taiwan
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Abstract
Mitomycin-C has recently become an adjunct medication for inhibition of fibroblast proliferation in glaucoma filtering procedures. Prolonged postoperative ocular hypotony has been a frequent complication of trabeculectomy with mitomycin-C. In order to characterize the hypotony mechanism, we compared the toxic effects of mitomycin-C on cultured rabbit ciliary process cells and trabecular meshwork cells. The results indicate that mitomycin-C has a more marked effect on ciliary process cells on 3H-thymidine uptake than on trabecular meshwork cells at concentrations ranging from 10(-1) to 10(-5) mg/ml after 3-, 5- and 60-min treatment, respectively. The living cells after mitomycin-C treatment were estimated with MTT assay that was converted tetrazolium dye of living cells only into insoluble purple formazan crystals within mitochondria. In the presence of mitomycin-C for 3, 5, and 60 min, the cellular MTT values in ciliary process cells were more decreased than in trabecular meshwork cells. Depolarization of the trabecular meshwork cells with 50 mM KCl led to an increase in intracellular calcium concentration, whereas application of mitomycin-C at 10(-3) mg/ml resulted in decrease of KCl-induced intracellular calcium increase. Mitomycin-C (10(-3) mg/ml) decreased cAMP concentration in ciliary process cells following 3- and 5-min treatment; however, it did not significantly affect the cellular cAMP concentration after only a 1-min exposure. Mitomycin-induced marked ladder pattern of DNA fragmentation was observed in ciliary process tissues after treatment with 10(-1) mg/ml of mitomycin-C for 3 and 5 min. However, the DNA pattern in trabecular meshwork tissues was not obviously affected by mitomycin-C. These findings from our results indicate that mitomycin-induced ocular hypotony may result from damage to both ciliary process and trabecular meshwork tissues.
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Affiliation(s)
- S J Hong
- Department of Pharmacology, Kaohsiung Medical University, Taiwan, ROC.
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Abstract
The effect of endothelins on corneal endothelial cells is not well understood. We have investigated the effects of endothelin-1 (ET-1), endothelin-2 (ET-2) and endothelin-3 (ET-3) on bovine corneal endothelial cellular proliferation and the secondary messenger changes in cells in the presence of ET-1. It was found that the 3H-thymidine uptake was enhanced by ET-1 significantly, whereas ET-2 and ET-3 had no effect. ET-1 remarkably affects the increase of corneal endothelial cells on 3H-thymidine, 3H-leucine, and 3H-uridine uptakes in a dose-dependent manner. The 50% effective concentrations (EC50) for ET-1, as measured by 3H-thymidine uptake, 3H-uridine uptake, and 3H-leucine uptake were 10(-8.78) M, 10(-8.53) M and 10(-8.04) M, respectively. It was found that endothelin-1 increased intracellular calcium concentration by using the method of preloading with Fura-2-AM and assaying with spectrophotometry. The cellular IP1, IP2, and IP3 were also stimulated in the presence of ET-1. Moreover, ET-1 enhanced the basal cellular cAMP and cGMP concentrations in corneal endothelial cells in a dose-dependent manner. Immunofluorescent staining revealed that ET-1 increased the fibronectin protein concentration and changed protein distribution in corneal endothelial cells. These findings indicate that endothelin-1 increases in cell proliferation and biological changes may be involved in changing intracellular calcium mobility, increasing intracellular phosphoinositides, enhancing intracellular cGMP and cAMP accumulation, and fibronectin protein synthesis.
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Affiliation(s)
- K Y Wu
- Department of Ophthalmology, Kaohsiung Medical University, Taiwan, Republic of China
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Abstract
OBJECTIVE To explore a possible mechanism of the increasing incidence of monozygotic twins following assisted hatching of human embryos. DESIGN Case report. SETTING Clinical research center in a medical school teaching hospital. PATIENT A 37-year-old infertile woman with repeated IVF failures. INTERVENTION(S) Assisted hatching of the day 3 embryos using acidic Tyrode's solution. MAIN OUTCOME MEASURE(S) The morphology of the zona-drilled embryos and the pregnancy outcome. RESULT(S) After assisted hatching, a herniated blastomere through an oversized opening in the zona pellucida was found in one embryo. The transfer of two zona-drilled embryos resulted in a triplet pregnancy. CONCLUSION(S) Large openings in the zona pellucida following chemically assisted hatching may cause premature hatching of the blastomeres and may be implicated in the occurrence of monozygotic twins.
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Affiliation(s)
- T C Sheen
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Taipei Medical College Hospital, #252, Wu Hsing Street, Taipei 110, Taiwan
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Wu KY, Hong SJ, Wang HZ, Hwang JH, Lai YH. Effects of drugs on cellular proliferation in cultured iris pigment epithelial cells and retinal pigment epithelial cells. Kaohsiung J Med Sci 2001; 17:77-83. [PMID: 11416961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023] Open
Abstract
In this study, iris and retinal pigment epithelial cells were cultured from porcine and various drugs including methionine-enkephalin, isoproterenol, dibutyryl cAMP, endothelin-1, dexamethasone and phorbol 12-myristate 13-acetate (PMA) were used to investigate their effects on both cellular proliferation in cultured porcine iris and retinal pigment epithelial cells. Cellular proliferation was estimated with 3H-thymidine uptake. It is indicated that both pigment epithelial cells possess epithelial-like morphology and abundant pigment granules in cells obviously. Following the iris pigment epithelial cells being treated with endothelin-1, the 3H-thymidine uptake in the cells was increased to 126% as compared with the control. However, the cellular proliferation was decreased to 83% when the cells were treated with isoproterenol. In the case of methionine-enkephalin, dibutyryl cAMP, dexamethasone and phorbol 12-myristate 13-acetate (PMA), the thymidine uptake in the iris pigment epithelial cells was not affected by above drugs. In the retinal pigment epithelial cells, the 3H-thymidine uptakes were increased to 145% and 146% when the cells were incubated with methionine-enkephalin, and isoproterenol, respectively. In the presence of dibutyryl cAMP, dexamethasone and phorbol ester (PMA), the cellular proliferation was inhibited to 83%, 73% and 85% respectively. However, endothelin-1 did not affect the cellular proliferation in retinal pigment epithelial cells. These results show that the morphological shapes of iris pigment epithelial cells are similar to retinal pigment epithelial cells. However, the cellular proliferation in both cells may be regulated by distinct mechanisms.
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Affiliation(s)
- K Y Wu
- Department of Ophthalmology, Kaohsiung Medical University, No. 100, Shih-Chuan 1st Road, Kaohsiung, Taiwan
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22
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Walker VE, Wu KY, Upton PB, Ranasinghe A, Scheller N, Cho MH, Vergnes JS, Skopek TR, Swenberg JA. Biomarkers of exposure and effect as indicators of potential carcinogenic risk arising from in vivo metabolism of ethylene to ethylene oxide. Carcinogenesis 2000; 21:1661-9. [PMID: 10964097 DOI: 10.1093/carcin/21.9.1661] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The purposes of the present study were: (i) to investigate the potential use of several biomarkers as quantitative indicators of the in vivo conversion of ethylene (ET) to ethylene oxide (EO); (ii) to produce molecular dosimetry data that might improve assessment of human risk from exogenous ET exposures. Groups (n = 7/group) of male F344 rats and B6C3F1 mice were exposed by inhalation to 0 and 3000 p. p.m. ET for 1, 2 or 4 weeks (6 h/day, 5 days/week) or to 0, 40, 1000 and 3000 p.p.m. ET for 4 weeks. N:-(2-hydroxyethyl)valine (HEV), N:7-(2-hydroxyethyl) guanine (N7-HEG) and HPRT: mutant frequencies were assessed as potential biomarkers for determining the molecular dose of EO resulting from exogenous ET exposures of rats and mice, compared with background biomarker values. N7-HEG was quantified by gas chromatography coupled with high resolution mass spectrometry (GC-HRMS), HEV was determined by Edman degradation and GC-HRMS and HPRT: mutant frequencies were measured by the T cell cloning assay. N7-HEG accumulated in DNA with repeated exposure of rodents to 3000 p.p.m. ET, reaching steady-state concentrations around 1 week of exposure in most tissues evaluated (brain, liver, lung and spleen). The dose-response curves for N7-HEG and HEV were supralinear in exposed rats and mice, indicating that metabolic activation of ET was saturated at exposures >/=1000 p.p.m. ET. Exposures of mice and rats to 200 p.p.m. EO for 4 weeks (as positive treatment controls) led to significant increases in HPRT: mutant frequencies over background in splenic T cells from exposed rats and mice, however, no significant mutagenic response was observed in the HPRT: gene of ET-exposed animals. Comparisons between the biomarker data for both unexposed and ET-exposed animals, the dose-response curves for the same biomarkers in EO-exposed rats and mice and the results of the rodent carcinogenicity studies of ET and EO suggest that too little EO arises from exogenous ET exposure to produce a significant mutagenic response or a carcinogenic response under standard bioassay conditions.
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Affiliation(s)
- V E Walker
- Department of Pathology and Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7525, USA.
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Wang HZ, Hong SJ, Wu KY. Change of calcium and cAMP concentration by adrenoceptor agents in cultured porcine corneal endothelial cells. J Ocul Pharmacol Ther 2000; 16:299-309. [PMID: 10977125 DOI: 10.1089/jop.2000.16.299] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
It has been reported that beta-adrenergic receptors are localized in the corneal endothelial cells. In this study, the change of cellular signal transduction, such as intracellular calcium and cAMP, was determined with pure adrenergic agonists and commercial antiglaucoma adrenergic agents. The intracellular calcium of cultured porcine corneal endothelial cells was inhibited by 10 microM isoproterenol and norepinephrine, but enhanced by propranolol and 50 mM KCl. In the case of phenylephrine, calcium mobility did not alter significantly. Verapamil, at 10 microM, decreased intracellular calcium concentration. In the presence of isoproterenol, cellular cAMP concentration increased from 28.8 pmole/mg protein (1 microM) to 42.2 pmole/mg protein (100 microM) compared with control of 6.07 pmole/mg protein. Incubation with commercial adrenergic eye drops, such as betaxolol, caused the cAMP concentration to increase from 21.6 pmole/mg protein (0.0005%) to 39.1 pmole/mg protein (0.05%). Adding commercial levobunolol and timolol into cells caused cellular cAMP to increase from 14.3 pmole/mg protein (0.0005%) to 840.5 pmole/mg protein (0.05%) and from 115.2 pmole/mg protein (0.00025%) to 931.0 pmole/mg protein (0.025%), respectively. However, the preservative, benzalkonium chloride, increased cellular cAMP from 15.4 pmole/mg protein (0.00001 mg/ml) to 1087.4 pmole/mg protein (0.01 mg/ml). It is concluded that the intracellular calcium of corneal endothelium decreases when the cellular adrenergic receptor is activated by agonists. Benzalkonium chloride, due to its preservative in commercial antiglaucoma agents which increases cellular cAMP, may alter corneal endothelial physiology through long-term use.
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Affiliation(s)
- H Z Wang
- Department of Ophthalmology, Kaohsiung Medical College, Taiwan, Republic of China
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Malee MP, Wu KY. Corticosteroid dynamics in the nonpregnant, pregnant, and postpartum spontaneously hypertensive rat. Am J Hypertens 2000; 13:410-7. [PMID: 10821344 DOI: 10.1016/s0895-7061(99)00287-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Factors responsible for hypertension in the spontaneously hypertensive rat (SHR) remain under investigation. As in human pregnancy complicated by essential chronic hypertension, the hypertension of the pregnant SHR subsides and returns postpartum. Because corticosteroid excess can cause hypertension, we examined several aspects of adrenocortical activity as potentially affecting the reported blood pressure profiles of nonpregnant, term pregnant, and postpartum SHR, using normotensive Wistar-Kyoto (WKY) rats as controls. We found that corticosterone levels were comparable in nonpregnant SHR and WKY rats, and unaffected by pregnancy. No differences were detected postpartum. Although pregnancy was accompanied by significant increases in plasma aldosterone levels, no interbreed differences were observed, which remained the case postpartum. Single adrenal cell secretion of aldosterone and corticosterone, as detected by reverse hemolytic plaque assay, yielded similar results in the pregnant and postpartum rat. Hormone responses to dietary manipulations in the nonpregnant and pregnant SHR and WKY suggest an important role for ACTH, and a lesser one for AII in the regulation of corticosteroids. In situ hybridization histochemistry, using a probe that detects both P450c11beta and P450c11AS mRNA, revealed comparable message density and zonal distribution in adrenals from pregnant and nonpregnant SHR and WKY rats. Breed- and pregnancy-dependent differences in adrenal expression of P450scc, P450c11beta, and P450c11AS were noted. In summary, our findings suggest that although some discrepancies exist in the aspects of adrenocortical activity examined, they are unlikely to be etiologic in the blood pressure profile observed in nonpregnant, pregnant, and postpartum SHR.
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Affiliation(s)
- M P Malee
- Department of Obstetrics and Gynecology, Brown University School of Medicine, Providence, Rhode Island 02905, USA.
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Swenberg JA, Christova-Gueorguieva NI, Upton PB, Ranasinghe A, Scheller N, Wu KY, Yen TY, Hayes R. 1,3-butadiene: cancer, mutations, and adducts. Part V: Hemoglobin adducts as biomarkers of 1,3-butadiene exposure and metabolism. Res Rep Health Eff Inst 2000:191-210; discussion 211-9. [PMID: 10925842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
1,3-Butadiene (BD) is an important chemical used largely in the manufacture of synthetic rubber and thermoplastic resins. In addition, it has been identified in cigarette smoke, automobile exhaust, and gasoline vapor. The objective of this research was to develop highly sensitive and specific assays for the detection and quantitation of hemoglobin adducts of three BD metabolites: 1,2-epoxy-3-butene (BDO), 1,2,3,4-diepoxybutane (BDO2), and 1,2-dihydroxy-3,4-epoxybutane (BDO-diol). We have successfully developed an assay for both N-(2-hydroxy-3-butenyl)valine (HBVal) and N-(2,3,4-trihydroxybutyl)valine (THBVal) in hemoglobin. The six adducts measured were the two diastereomers (isomers I and II) of HBVal and the four diastereomers of THBVal (isomers I through IV, which were eluted as three peaks, 1, 2, and 3). HBVal and THBVal were measured in control and exposed B6C3F1 mice and Sprague-Dawley rats (1,000 ppm BD for 13 weeks at 6 hours/day, 5 days/week). In a second set of animal exposures, total THBVal was determined in B6C3F1 female mice (n = 5) exposed to 1,250 ppm BD for 1, 5, or 10 days (6 hours/day, 5 days/week). THBVal adducts were also monitored in occupationally exposed Chinese workers and nonoccupationally exposed U.S. laboratory workers. This study utilized the modified Edman degradation method of Törnqvist and colleagues (1986). Briefly, the samples were subjected to Edman degradation, Centricon-30 ultrafiltration, washing on C18 columns, and acetylation for isomers of THBVal only, followed by gas chromatography-mass spectrometry (GC-MS) quantitation. For the HBVal assay, an authentic internal standard globin alkylated with [2H6]BDO was used; for the THBVal assay, a synthesized external standard, THB[13C5]Val, was used after Edman degradation. The mean +/- SD amounts of total HBVal measured in exposed mice (in pmol/g globin) were 16,560 +/- 3,910 for female mice (n = 4) and 12,400 +/- 2,030 for male mice (n = 5). The corresponding values for rats were 8,690 +/- 930 for female rats (n = 5) and 5,480 +/- 2,880 for male rats (n = 3). The total amount of THBVal (eluted peaks 1, 2, and 3) in male mice (n = 5) was 78,900 +/- 13,700; and in females (n = 2) was 56,100 +/- 100. In male rats (n = 3), the detected value was 9,650 +/- 1,620 and in females (n = 3) the value was 21,600 +/- 6,780. In control male mice (n = 4), the total level of THBVal isomers was approximately 27 pmol/g globin. In a control male rat, total THBVal was approximately 15 pmol/g globin. In the time course study, the amount of THBVal adducts increased linearly with exposure, resulting in values of 4,200 +/- 830, 19,760 +/- 1,780, and 35,940 +/- 3,460 pmol/g globin following 1, 5, or 10 days of exposure to 1,250 ppm BD, respectively. Detection of HBVal in human samples was difficult due to low concentrations of adducts and a high background in the chromatograms. In a pooled sample from 4 individuals, we performed multiple separations with high-pressure liquid chromatography (HPLC) of the derivatized adducts and detected 4.6 pmol/g globin (that is, 2.7 and 1.9 pmol/g globin for isomers I and II, respectively). We measured the amounts of THBVal in both nonoccupationally exposed U.S. laboratory workers and occupationally exposed workers from a polybutadiene plant in China. The mean total amount of THBVal among the U.S. laboratory workers was 36 +/- 23 pmol/g globin for nonsmokers (n = 7) and 40 +/- 9 for smokers (n = 4), compared with a mean total amount of 39 +/- 13 pmol/g globin in a control set of Chinese workers (n = 25). These control values are overestimations of the true values because the amounts of THBVal in globin samples from other unexposed individuals (15 of 51) were below our limit of detection. BD-exposed Chinese workers had a total amount of 88 +/- 59 pmol/g globin THBVal. The difference between smokers and nonsmokers was not significant, whereas the difference between control and exposed Chinese workers was highly significant (p < 0.001).
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Affiliation(s)
- J A Swenberg
- Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill 27599, USA
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Abstract
There is increasing evidence that the intrauterine milieu and corticosteroid exposure play a role in the etiology of hypertension. We examined adrenocortical gene expression and circulating corticosteroids in the d 21 fetal spontaneously hypertensive rat (SHR) and its normotensive genetic control, the Wistar-Kyoto (WKY) rat. By RNase protection assays, we found no differences in the relative abundances of mRNAs for P450scc and P450c11beta, and barely detectable P450c11AS mRNA in the adrenals of fetal SHR and WKY rats. P450c11B3 RNA was undetectable by reverse transcription polymerase chain reaction in both SHR and WKY fetuses. The zonal expression of P450c11 mRNA was comparable in SHR and WKY fetuses by in situ hybridization histochemistry. There were no significant differences in peripheral levels of aldosterone and corticosterone by radioimmunoassay in fetal SHR and WKY rats. Based upon the absence of distinct differences in the aspects of adrenocortical activity examined, it is unlikely that they are integral in the programming of hypertension in this model.
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Affiliation(s)
- M P Malee
- Department of Obstetrics and Gynecology, Brown University School of Medicine, Providence, Rhode Island 02905, USA
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Abstract
Improper use of mitomycin-C in ocular medication may result in damage to corneal cells. In this study, the toxic effects of mitomycin-C on cultured porcine keratocytes and endothelial cells were estimated by MTT, 3H-thymidine uptake and cellular counting assay methods. It was found that mitomycin-C caused a dose-dependent toxic effect to keratocytes and endothelial cells. Both cells were treated with mitomycin-C at the concentration ranging from 100, 10, 1, 0.1 to 0.01 microg/ml for 3 min, 5 min or 100 min. The 50% inhibitory dose (ID50) of mitomycin-C to keratocytes and endothelial cells as measured by MTT assay was 0.40, 0.18, 0.16 mg/ml and 0.27, 0.15, 0.14 mg/ml, respectively, after 3, 5 and 100 minutes drug treatment. The ID50 for keratocytes and endothelial cells as measured by 3H-thymidine uptake immediately, 1 day and 7 days after 100 minutes mitomycin-C treatment was 0.3, 0.0002, 143.2 microg/ml and 45.1, 101.1, 450.2 microg/ml, respectively. The ID50 for keratocytes and endothelial cells as measured by cellular counting 1 day and 7 days after mitomycin-C treatment was 232.5, 109.7 microg/ml and 239.9, 367.5 microg/ml, respectively. It is concluded that mitomycin-C is more toxic to cellular proliferation in cultured corneal keratocytes than in endothelial cells.
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Affiliation(s)
- K Y Wu
- Department of Ophthalmology, Kaohsiung Medical College, Taiwan, Republic of China
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Wu KY, Ranasinghe A, Upton PB, Walker VE, Swenberg JA. Molecular dosimetry of endogenous and ethylene oxide-induced N7-(2-hydroxyethyl) guanine formation in tissues of rodents. Carcinogenesis 1999; 20:1787-92. [PMID: 10469625 DOI: 10.1093/carcin/20.9.1787] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The formation of N7-(2-hydroxyethyl)guanine (7-HEG) in DNA was investigated previously in target and non-target tissues of F-344 rats and B6C3F1 mice exposed to >/=ISOdia>/=10 p.p.m. concentrations of ethylene oxide (EO) using fluorescence-linked high-performance liquid chromatography [V.E. Walker et al. (1992) Cancer Res., 52, 4238-4334]. In order to study the dose-responses for 7-HEG at lower exposures, a highly sensitive and specific gas chromatography coupled with high-resolution mass spectrometry (GC-HRMS) assay was developed. DNA was extracted from liver, brain, lung and spleen of B6C3F1 mice and F-344 rats exposed to 0, 3, 10, 33 or 100 p.p.m. EO for 4 weeks (6 h/day, 5 days/week). Analysis of DNA from control rodents showed that endogenous 7-HEG varied from 0.2 +/- 0.1 to 0.3 +/- 0.2 pmol/micromol guanine in tissues of rats and mice. 7-HEG exhibited tissue- and species-specific dose-response relationships in EO-exposed animals. Linear dose-response relationships were evident in mouse liver, brain and spleen at exposures between 3 and 100 p.p.m. Mouse lung exhibited a slightly sublinear response between 33 and 100 p.p.m. EO. The relationships were linear in liver and spleen of rats between 3 and 100 p.p.m. EO, but were slightly sublinear in brain and lung between 33 and 100 p.p.m. EO. The number of 7-HEG adducts present in rats exposed to 3 p.p.m. EO was 5.3-12.5 times higher than endogenous 7-HEG in unexposed controls. In contrast, mice exposed to 3 p.p.m. EO only had 1.3- to 2.5-fold greater numbers of 7-HEG adducts. The factors driving the exposure-response relationships are also likely to affect carcinogenic and mutagenic responses of rodents to EO. Likewise, a better understanding of the relationships between 7-HEG derived from low exposures to EO and endogenously formed 7-HEG may be important for the accurate extrapolation of risk to humans.
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Affiliation(s)
- K Y Wu
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC 27599, USA
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Wu KY, Scheller N, Ranasinghe A, Yen TY, Sangaiah R, Giese R, Swenberg JA. A gas chromatography/electron capture/negative chemical ionization high-resolution mass spectrometry method for analysis of endogenous and exogenous N7-(2-hydroxyethyl)guanine in rodents and its potential for human biological monitoring. Chem Res Toxicol 1999; 12:722-9. [PMID: 10458706 DOI: 10.1021/tx990059n] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A gas chromatography/electron capture/negative chemical ionization high-resolution mass spectrometry (GC/EC/NCI-HRMS) method was developed for quantitating N7-(2-hydroxyethyl)guanine (N7-HEG) with excellent sensitivity and specificity. [4,5,6,8-(13)C(4)]-N7-HEG was synthesized, characterized, and quantitated using HPLC/electrospray ionization mass spectrometry (HPLC/ESI-MS) so it could serve as an internal standard. After being converted to its corresponding xanthine and derivatized with pentafluorobenzyl (PFB) bromide twice, the PFB derivative of N7-HEG was characterized using GC/EC/NCI-HRMS carried out at full scan mode. The most abundant fragment was at m/z 555, with a molecular formula of C(21)H(9)N(4)O(3)F(10), resulting from the loss of one PFB group. By monitoring m/z 555.0515 (analyte) and m/z 559.0649 (internal standard), this assay demonstrated a linear relationship over a range of 1 fmol to 1 pmol of N7-HEG versus 20 fmol of [(13)C(4)]-N7-HEG on column. The limit of detection (LOD) for the complete assay was 600 amol (S/N = 5) injected on column. The variation of this assay was within 15% from 1 to 20 fmol of N7-HEG versus 2 fmol of [(13)C(4)]-N7-HEG with four replications for each calibration standard. Two hundred to three hundred micrograms of spleen DNA of control rats and mice and 100 microg of spleen DNA of rats and mice exposed to 3000 ppm ethylene for 6 h/day for 5 days were analyzed using GC/EC/NCI-HRMS. The amounts of N7-HEG varied from 0.2 to 0.3 pmol/micromol of guanine in tissues of control rats. Ethylene-exposed animals had 5-15-fold higher N7-HEG levels than controls. This assay was able to quantitate N7-HEG in 25-30 microg of DNA from human lymphocytes with excellent specificity. This was due in part to human tissues having 10-15-fold higher amounts of endogenous N7-HEG than rodents. These results show that this GC/EC/NCI-HRMS method is highly sensitive and specific and can be used in biological monitoring and molecular dosimetry and molecular epidemiology studies.
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Affiliation(s)
- K Y Wu
- Laboratory of Molecular Carcinogenesis and Mutagenesis, Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 27599-7400, USA
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Abstract
Offspring of diabetics are at increased risk for diabetes as adults. As corticosteroids are intimately involved in glucose homeostasis, we investigated aspects of corticosteroid activity in the late gestation fetuses of control, moderately diabetic and insulin-controlled streptozotocin-induced diabetic rats. We found that moderate maternal diabetes had no effect upon litter size or fetal body weight. Uncontrolled maternal diabetes was accompanied by fetal hyperglycemia, hyperinsulinemia and elevated aldosterone. Maternal insulin treatment normalized fetal glucose and aldosterone; fetal insulin and corticosterone levels increased. Maternal diabetes had no effect upon fetal adrenal expression of P450scc mRNA; the abundance of P450c11beta mRNA increased, and returned to that of the control gestation upon insulin treatment. P450c11AS mRNA was barely detectable, and decreased in the fetuses of insulin-treated diabetics. P450c11B3 mRNA was undetectable in all fetal groups. Our results implicate aspects of maternal diabetes in the expression of a fetal adrenocortical imprint, manifested as a greater abundance of P450c11beta mRNA. Although not accompanied by elevated corticosterone in the fetus, this imprint could ultimately allow for greater potential corticosterone production in response to typical stimuli, and thus contribute to the tendency towards glucose dysregulation in these offspring of diabetic gestations.
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Affiliation(s)
- M P Malee
- Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, Women and Infants' Hospital, Brown University, Providence, RI 02905, USA.
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Abstract
Blood pressure is reportedly elevated in the spontaneously hypertensive rat (SHR) neonate, the etiology of which remains unclear. Aberrations in the hypothalamic-pituitary-adrenal axis have been implicated, as it is well accepted that excess corticosteroids are associated with hypertension. We examined aspects of adrenocortical activity in the neonatal SHR 1 to 21 days old and its normotensive genetic control, the Wistar-Kyoto rat (WKY). We found a fourfold greater abundance of P450scc mRNA in adrenals of SHR versus WKY day 1 neonates, and increasing but comparable abundance of adrenal P450c11B mRNA on neonatal days 1 to 21. The pattern of P450c11AS mRNA expression was distinctly different in the adrenals of SHR and WKY neonates; the relative abundance of this mRNA in SHR increased 15-fold over the 21-day period examined, whereas that in WKY remained fairly stable. RT-PCR for the presence/abundance of adrenal P450c11B3 mRNA showed absence in day 1 SHR and WKY, comparable abundances on neonatal days 7 and 14, and a distinctly greater abundance in the day 21 SHR adrenals. Peripheral corticosterone levels were threefold greater in the day 1 SHR neonate; aldosterone levels were elevated in both the SHR and WKY day 1 neonate. Thereafter, corticosterone and aldosterone levels were comparable on days 7, 14, and 21, although the anticipated depression in circulating corticosterone levels typical of the stress hyporesponsive period was noted in both SHR and WKY neonates. Although patterns of adrenocortical activity differ in the newborn SHR and WKY rat, our findings do not support an etiologic role for corticosteroids in the reported hypertension of the SHR. However, observed differences in corticosteroid profiles may augment or have a permissive effect upon the etiologic factor(s).
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Affiliation(s)
- M P Malee
- Department of Obstetrics and Gynecology, Women and Infants' Hospital, Brown University School of Medicine, Providence, Rhode Island 02905, USA.
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Su CY, Lin CP, Wang HZ, Su MY, Tsai RK, Wu KY, Sheu MM. Intraocular use of fluconazole in the management of ocular fungal infection. Kaohsiung J Med Sci 1999; 15:218-25. [PMID: 10330801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Abstract
In this study, we investigate the efficacy and safety of intraocular use of fluconazole in the treatment of ocular fungal infection. Ten patients with intraocular fungal infections were examined. Among these patients, eight were infected with keratomycosis with intraocular spreading, one had postoperative fungal endophthalmitis after cataract operation with an intraocular lens implant, and another suffered from endogenous fungal endophthalmitis. In addition to the conventional local application with or without systemic administration of antifungal drugs, all ten patients were treated with intraocular administration of 5-10 micrograms/ml of fluconazole. The ocular fungal infections resolved in nine patients without obvious side effect. One failed in the antifungal treatment with loss of vision. In our experience, the results revealed that fluconazole is a safe and effective antifungal agent that can be administered intraocularly. We suggest that intraocular administration of this drug could be considered as an alternative or additional choice for the treatment of severe ocular fungal infections.
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Affiliation(s)
- C Y Su
- Department of Ophthalmology, Kaohsiung Medical College, Taiwan, Republic of China
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Chen S, Xu R, Yee A, Wu KY, Wang CN, Read S, De Grandis SA. An automated fluorescent PCR method for detection of shiga toxin-producing Escherichia coli in foods. Appl Environ Microbiol 1998; 64:4210-6. [PMID: 9797267 PMCID: PMC106629 DOI: 10.1128/aem.64.11.4210-4216.1998] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/1998] [Accepted: 08/12/1998] [Indexed: 11/20/2022] Open
Abstract
An automated fluorescence-based PCR system (a model AG-9600 AmpliSensor analyzer) was investigated to determine whether it could detect Shiga toxin-producing Escherichia coli (STEC). The AmpliSensor PCR assay involves amplification-mediated disruption of a fluorogenic DNA signal duplex (AmpliSensor) that is homologous to conserved target sequences in a 323-bp amplified fragment of Shiga toxin genes stx1, stx2, and stxe. Using the Amplisensor assay, we detected 113 strains of STEC belonging to 50 different serotypes, while 18 strains of non-Shiga-toxin-producing E. coli and 68 strains of other bacteria were not detected. The detection limits of the assay were less than 1 to 5 CFU per PCR mixture when pure cultures of five reference strains were used and 3 CFU per 25 g of food when spiked ground beef samples that were preenriched overnight were used. The performance of the assay was also evaluated by using 53 naturally contaminated meat samples and 48 raw milk samples. Thirty-two STEC-positive samples that were confirmed to be positive by the culture assay were found to be positive when the AmpliSensor assay was used. Nine samples that were found to be positive when the PCR assay was used were culture negative. The system described here is an automated PCR-based system that can be used for detection of all serotypes of STEC in food or clinical samples.
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Affiliation(s)
- S Chen
- Guelph Molecular Supercentre, Laboratory Services Division, University of Guelph, Guelph, Ontario, Canada N1H 8J7
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Schleper C, DeLong EF, Preston CM, Feldman RA, Wu KY, Swanson RV. Genomic analysis reveals chromosomal variation in natural populations of the uncultured psychrophilic archaeon Cenarchaeum symbiosum. J Bacteriol 1998; 180:5003-9. [PMID: 9748430 PMCID: PMC107533 DOI: 10.1128/jb.180.19.5003-5009.1998] [Citation(s) in RCA: 119] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/1998] [Accepted: 07/21/1998] [Indexed: 11/20/2022] Open
Abstract
Molecular phylogenetic surveys have recently revealed an ecologically widespread crenarchaeal group that inhabits cold and temperate terrestrial and marine environments. To date these organisms have resisted isolation in pure culture, and so their phenotypic and genotypic characteristics remain largely unknown. To characterize these archaea, and to extend methodological approaches for characterizing uncultivated microorganisms, we initiated genomic analyses of the nonthermophilic crenarchaeote Cenarchaeum symbiosum found living in association with a marine sponge, Axinella mexicana. Complex DNA libraries derived from the host-symbiont population yielded several large clones containing the ribosomal operon from C. symbiosum. Unexpectedly, cloning and sequence analysis revealed the presence of two closely related variants that were consistently found in the majority of host individuals analyzed. Homologous regions from the two variants were sequenced and compared in detail. The variants exhibit >99.2% sequence identity in both small- and large-subunit rRNA genes and they contain homologous protein-encoding genes in identical order and orientation over a 28-kbp overlapping region. Our study not only indicates the potential for characterizing uncultivated prokaryotes by genome sequencing but also identifies the primary complication inherent in the approach: the widespread genomic microheterogeneity in naturally occurring prokaryotic populations.
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Affiliation(s)
- C Schleper
- Marine Science Institute, University of California, Santa Barbara, California 93106, USA
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Wu KY, Wang HZ, Chang ST, Hong SJ. Dexon and nylon-sutured wound reaction in conjunctival flap after trabeculectomy combined with or without topical application of mitomycin-C. Kaohsiung J Med Sci 1998; 14:644-52. [PMID: 9819507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
In this study, rabbits were used to evaluate the sutured wound reaction with Dexon or nylon in the conjunctival flap 1, 4, 7, 14 and 28 days after trabeculectomy surgery with or without the use of mitomycin-C. Four major treated groups were used to compare their wound healing reaction; group 1--nylon-suture and non-mitomycin treatment; group 2--nylon-suture and mitomycin treatment; group 3--Dexon-suture and non-mitomycin treatment; group 4--Dexon-suture and mitomycin treatment. One day after surgery, the number of polymorphs was the greatest most in the nylon-sutured and non-mitomycin treated tissues (86 +/- 2). Four days after surgery, the number of polymorphs was the greatest most in Dexon-sutured and non-mitomycin treated tissues (109 +/- 87). The number of fibroblasts was the greatest most in nylon-sutured and non-mitomycin treated tissues (111 +/- 23). Seven days after surgery, the number of polymorphs was the greatest most in Dexon-sutured and mitomycin treated tissues (32 +/- 12). The number of fibroblasts was the greatest most in nylon-sutured and non-mitomycin treated tissues (126 +/- 15). Fourteen days after surgery, the number of fibroblasts was the greatest most in Dexon-sutured and non-mitomycin tissues (43 +/- 10). The number of goblet cells was the greatest most in nylon-sutured and non-mitomycin treated tissues (4 +/- 2). Twenty-eight days after surgery, the number of fibroblasts was the greatest most in Dexon-sutured and mitomycin treated tissues (40 +/- 15). The number of goblet cells was the greatest most in nylon-sutured and non-mitomycin treated tissues (4 +/- 2). Our conclusions are as follows: 1). The concentration of mitomycin in conjunctival wound edge should be maintained at as low a level as possible because the mitomycin will delay the wound healing process; 2). Nylon material is better than Dexon for conjunctival wound suture because nylon could induce a great quantity of fibroblasts before Dexon did.
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Affiliation(s)
- K Y Wu
- Department of Ophthalmology, Kaohsiung Medical College, Taiwan, Republic of China
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Wu KY, Wang HZ, Hong SJ. Calcium-induced changes on crystallins in organ-cultured porcine lens. Kaohsiung J Med Sci 1998; 14:569-76. [PMID: 9796201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
In this study, intact porcine lenses were cultured in vitro for 7 days supplemented with commercial balanced salt solution (BSS) which is usually used as an irrigation solution during intraocular surgery, and the lenses were maintained under various culture conditions, e.g. temperature and CO2 concentration. The intact porcine lenses after 7 days culture were analyzed with optical density scanner, gel permeation chromatography on TSK HM-55 column and SDS-PAGE (polyacrylamide gel electrophoresis). It was found that lenses exhibited the least opacity when lenses were cultured with Ca(+2)-free BSS buffer, CO2-free incubator and maintained at a temperature of 25 degrees C. After the lenses were cultured with Ca(+2)-free BSS or BSS medium, the composition of crystallins in lenses was separated with TSK HM-55 column. It was indicated that the percentage of high molecular weight (HMW) protein and (alpha-crystallin increased, and gamma-crystallin decreased in lenses incubated with BSS medium compared with lenses incubated with Ca(+2)-free BSS medium. Following an increase in the concentration of calcium in the medium from 4.3 mM, 20 mM, 50 mM, 100 mM to 200 mM, the opacity of the lens was measured with a densitometer. The changed percentage of various crystallins was similar to lenses with BSS media that increased in HMW protein and alpha-crystallin, decreasing in gamma-crystallin. In the case of lens protein pattern, the crystallin washed from TSK HM-55 gel was separated with SDS-PAGE (polyacrylamide gel electrophoresis). It was indicated that some of proteins disappeared when lenses were incubated with various concentrations of calcium. The vanished pH proteins were 20.5 kDa at 50 mM calcium, 20.5 kDa and 21 kDa at 100 mM, 20.5 kDa, 21 kDa, 22 kDa and 23 kDa at 200 mM which were compared with the protein bands in the presence of 20 mM calcium in BSS medium. This study indicates that the commercial balanced salt solution (BSS) which is usually used as an irrigating solution during intraocular operations may increase the risk for lens opacity because of the calcium contained in the solution.
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Affiliation(s)
- K Y Wu
- Department of Ophthalmology and Pharmacology, Kaohsiung Medical College, Taiwan, Republic of China
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Hong SJ, Wu KY, Chen IJ. Ocular hypotensive and vasodilative effects of two beta-adrenergic blockers with intrinsic sympathomimetic activity. Curr Eye Res 1998; 17:700-7. [PMID: 9678415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
PURPOSE The ocular hypotensive and vasodilative effects of vaninolol and eugenolol, two beta-adrenergic blockers with intrinsic sympathomimetic activity, were tested in rabbits and their pharmacologic mechanisms were also studied in vitro. METHODS Intraocular pressure was measured in ocular hypertonic rabbits which were induced by infusing 20% NaCl or 5% glucose solution. The rabbit's ocular blood flow was determined using the colored microsphere technique. The concentrations of cAMP were evaluated in porcine ciliary body and cultured A7r5 smooth muscle cells by radioimmunoassay. Ca+2 concentration was measured in A7r5 cells by spectrofluorometry after loading cells with Fura-2-AM. RESULTS It was found that 0.5% eugenolol and vaninolol could suppress the intraocular pressure in glucose-induced ocular hypertensive rabbits and delay the intraocular pressure recovery in NaCl-induced ocular hypertensive rabbits. In addition, both agents improved the ocular blood flow in the iris, ciliary body, retina and choroid. Vaninolol and eugenolol of 10 microM inhibited the basal cAMP accumulation from 23.9 +/- 2.0 of control to 8.7 +/- 0.4 and 2.4 +/- 0.1 respectively and inhibited the isoproterenol-induced cAMP accumulation from 154.3 +/- 13.6 to 120.6 +/- 8.3 and 74.2 +/- 6.1 respectively in the porcine ciliary body. The cellular cAMP concentration was significantly increased from 10 +/- 1 of control to 96 +/- 5 (vaninolol) and 38 +/- 3 (eugenolol) in cultured A7r5 smooth muscle cells. Both agents also increased the intracellular calcium concentration in A7r5 cells. CONCLUSIONS These results indicate that the lowering of intraocular pressure by vaninolol and eugenolol may be due to cAMP suppression in the ciliary body by beta-antagonist and/or alpha2-agonist activities. Both agents cause vasodilation via beta2-agonist action that increase the smooth muscle cellular cAMP level more than vasoconstriction via alpha-agonist activity by increasing an influx of extracellular Ca+2.
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Affiliation(s)
- S J Hong
- Department of Pharmacology, Kaohsiung Medical College, Taiwan, ROC.
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Ranasinghe A, Scheller N, Wu KY, Upton PB, Swenberg JA. Application of gas chromatography/electron capture negative chemical ionization high-resolution mass spectrometry for analysis of DNA and protein adducts. Chem Res Toxicol 1998; 11:520-6. [PMID: 9585483 DOI: 10.1021/tx9702042] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The analytical potential of gas chromatography/electron capture negative chemical ionization high-resolution mass spectrometry (HRMS) for characterization and quantitation of DNA and hemoglobin adducts was demonstrated using three model compounds: N2, 3-ethenoguanine (EG), 7-(2-hydroxyethyl)guanine (7-HEG), and N-(2-hydroxyethyl)valine (HEV). At a resolving power of 10 000, the signal-to-noise (S/N) ratios obtained from quantitative selected ion monitoring (SIM) experiments using biological samples were comparable to or better than existing unit mass resolution experiments due to the reduction of chemical noise from the use of narrower mass windows. The specificity gained by HRMS was essential for quantitation of ultratrace amounts near the limit of detection since coeluting interferences of the analyte or internal standard can lead to inaccurate measurement of response factors. The limit of detection (LOD) was 100 amol (S/N = 5) using a pure standard of TTB2-EG. The LOD for complete assays using spiked samples was 500 amol (S/N = 5) for EG and 600 amol (S/N = 5) injected for 7-HEG. The standard deviation (SD) for the HRMS quantitative measurements was typically less than 10%. The SD for the complete biological assays as determined by spiking replicate samples was less than 15%. This method has adequate sensitivity and specificity to accurately measure DNA and protein adducts as low as endogenous concentrations in rodent and human tissues.
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Affiliation(s)
- A Ranasinghe
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 27599-7400, USA
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Wang HZ, Wu KY, Lin CP, Fong JC, Hong SJ. Alteration of glucose uptake in cultured human corneal endothelial cells grown in high glucose media via cAMP-dependent pathway. Kaohsiung J Med Sci 1997; 13:566-71. [PMID: 9348735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
In this study, cultured human corneal endothelial cells were incubated in media containing various concentrations of glucose at 5 mM, 10 mM, and 25 mM for 2 days. Then, the cellular 2-deoxyglucose uptake and cAMP concentration of cultured human corneal endothelial cells were measured. The results indicated that the activity of cellular glucose uptake of nmole/min/mg protein was decreased gradually from 0.18 (5 mM), 0.10 (10 mM), 0.07 (20 mM) to 0.06 (25 mM) after 2 days incubation with a high concentration of glucose. The glucose uptake in insulin-treated human corneal endothelial cells also exhibited a similar declining effect in high glucose media from 0.30 (5 mM), 0.11 (10 mM), 0.08 (20 mM) to 0.05 (25 mM). The cAMP concentration in human corneal endothelial cells was measured in the presence of high glucose media. It was indicated that the cAMP concentrations of pmole/well in both insulin-treated and non-insulin treated cells were also decreased after increasing the glucose concentration in the media from 73 (5 mM) to 20 (25 mM) and 101 (5 mM) respectively. The cAMP concentration in insulin-treated cells was less than in non-insulin treated cells. This decreasing effect was significantly reversed by the addition of 1 mM dibutyryl-cAMP to the cells for 1 hour in both groups. These results suggest that the diabetic state may decrease the 2-deoxyglucose uptake in human corneal endothelial cells via cAMP-dependent pathway.
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Affiliation(s)
- H Z Wang
- Department of Ophthalmology, Kaohsiung Medical College, Taipei, Taiwan, Republic of China
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Chen S, Yee A, Griffiths M, Wu KY, Wang CN, Rahn K, De Grandis SA. A rapid, sensitive and automated method for detection of Salmonella species in foods using AG-9600 AmpliSensor Analyzer. J Appl Microbiol 1997; 83:314-21. [PMID: 9351211 DOI: 10.1046/j.1365-2672.1997.00226.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The AG-9600 AmpliSensor Analyzer is an automated fluorescence-based system for detection of polymerase chain reaction (PCR) products. The principle of the AmpliSensor PCR assay involves amplification-mediated disruption of a fluorogenic DNA signal duplex (AmpliSensor) that is homologous to a target sequence within a 284-bp amplified fragment of the Salmonella invA gene. Since the assay is homogenous, the data can be obtained by direct measurement of fluorescence of the amplification mixture. The accumulation of the amplified product, reflected by the fluorescence index, is monitored cycle by cycle by the AG-9600 Analyzer. The detection limit of the assay was less than 2 colony-forming units (cfu) per PCR reaction using a pure culture of Salmonella typhimurium. In post-spiking experiments in which Salmonella was added to the overnight pre-enriched samples (chicken carcass rinses, ground beef, ground pork and raw milk), the detection limit of the assay was 2-6 cfu per PCR reaction. In pre-spiking experiments in which Salmonella was added to the samples prior to overnight pre-enrichment, the detection limit was less than 3 cfu per 25 g or 25 ml of food. The assay was up to 2 orders of magnitude more sensitive than detection by ethidium bromide-stained agarose gel electrophoresis. To further evaluate assay performance, 54 naturally contaminated chicken carcass rinses, 65 raw milk and six ground pork samples were tested in the study. Thirty-eight Salmonella-positive samples confirmed by the Modified Semi-solid Rappaport-Vassiliadis (MSRV) culture assay were found positive using the AmpliSensor assay. Two chicken carcass rinses found positive using the assay were MSRV-negative. In addition, relative quantification using the AmpliSensor assay was linear up to 3 logs of initial target concentration in artificially contaminated food samples.
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Affiliation(s)
- S Chen
- University of Guelph, Department of Food Science, Ontario, Canada
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Wu KY, Hong SJ, Fong JC, Chung YM. Effects of antiglaucoma drugs and corticosteroids on the cellular glucose uptake in cultured porcine corneal endothelial cells. Kaohsiung J Med Sci 1997; 13:480-6. [PMID: 9311199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
In this study, various commercially used antiglaucoma drugs and corticosteroids were investigated in their effects on porcine corneal endothelial cells especially in cellular glucose uptake. Cellular glucose uptake directly affects the pumping efficiency in corneal endothelial cells. Following the cells' treatment with various antiglaucoma eyedrops for 100 min, the 3H-2-deoxyglucose uptake in cultured porcine corneal endothelial cells was affected by betaxolol from 3.1% (1.6 mM), 181% (0.16 mM) to 158% (0.016 mM), by timolol from 93% (0.79 mM), 227% (0.079 mM) to 151% (0.0079 mM), by carteolol from 141% (3.4 mM), 180% (0.34 mM) to 97% (0.034 mM), by levobunolol from 80% (1.5 mM), 98% (0.15 mM) to 90% (0.015 mM), by dipivefrin from 116% (0.2 mM), 176% (0.02 mM) to 108% (0.002 mM) and by pilocarpine from 115% (9.6 mM), 210% (0.96 mM) to 210% (0.096 mM) when the cells were compared with a control medium. In the presence of various corticosteroids, the glucose uptake in corneal endothelial cells was affected by fluorometholone from 160% (0.26 mM), 139% (0.026 mM) to 107% (0.0026 mM), by dexamethasone from 85% (0.25 mM), 117% (0.025 mM) to 109% (0.0025 mM) and by betamethasone from 95% (0.25 mM), 96% (0.025 mM) to 99% (0.0025 mM). These results show that the commercial eyedrops of antiglaucoma drugs and corticosteroids will not decrease the cellular glucose uptake in cultured porcine corneal endothelial cells except when incubated with high concentrations of betaxolol, levobunolol and dexamethasone.
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Affiliation(s)
- K Y Wu
- Department of Ophthalmology, Kaohsiung Medical College, Taiwan, Republic of China
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Abstract
It has been found that long-term therapy with topical antiglaucoma drugs may decrease the success of glaucoma filtering surgery. In this study, various antiglaucoma drugs, including carteolol, betaxolol, levobunolol, pilocarpine, and timolol, were investigated for their proliferative effect on cultured human Tenon's fibroblast cells. It was found that the 3H-thymidine uptake of cultured fibroblast cells was inhibited by commercial antiglaucoma drugs, including carteolol of 0.1% concentration (13%), 0.01% (50%) and 0.001% (53%), betaxolol of 0.05% concentration (14%), 0.005% (42%) and 0.0005% (62%), levobunolol of 0.05% concentration (2%), 0.005% (32%) and 0.0005% (55%), and timolol of 0.025% concentration (4%), 0.0025% (47%) and 0.00025% (55%), whereas the 3H-thymidine uptake was increased by commercial pilocarpine eyedrop from 103% (0.2% of concentration), 170% (0.02% of concentration) to 171% (0.002% of concentration), when cells were treated with commercial drugs for 100 min. Meanwhile, the proliferations of cultured fibroblast cells were stimulated by simultaneously combining 0.2%, 0.02% and 0.002% concentrations of pilocarpine eyedrops with other antiglaucoma drugs, such as carteolol of 0.1% concentration (50%), 0.01% (113%) and 0.001% (138%), betaxolol of 0.05% concentration (24%), 0.005% (128%) and 0.0005% (142%), levobunolol of 0.05% concentration (32%), 0.005% (87%) and 0.0005% (119%), and timolol of 0.025% concentration (15%), 0.0025% (94%) and 0.00025% (118%). Following incubation with pure pilocarpine, the proliferation of Tenon's fibroblast cells was inhibited for 84% (0.2% concentration), 84% (0.02% concentration) and 90% (0.002% concentration). When fibroblast cells were treated with commercial pilocarpine eyedrops for 24 hours, the 3H-thymidine uptake was increased to 160% (0.02% concentration) and 172% (0.002% concentration). This result shows that the commercial pilocarpine may play a crucial role for the proliferation of cultured human Tenon's fibroblast cells.
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Affiliation(s)
- K Y Wu
- Department of Ophthalmology, Kaohsiung Medical College, Taiwan, Republic of China
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Abstract
We present the design of a 12 × 12 photonic crossbar interconnection network constructed using a single three-dimensional acousto-optic crystal. Previous crossbars based on bulk acousto-optic cells require multichannel deflectors with one deflector per optical input; in contrast the design presented here angularly multiplexes these independent deflectors into a single-transducer acousto-optic device. A Fourier-optics analysis of an acoustically lossy Bragg deflector is coupled to a momentum-space analysis that permits the derivation of complete design equations for the switch. As a concrete example, the complete design of a 12 × 12 crossbar is presented. Finally, a coupled-mode analysis of the first- and second-order diffractions in the angularly multiplexed Bragg cell reveals the fundamental efficiency bounds of the switching network.
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Chiang PW, Song WJ, Wu KY, Korenberg JR, Fogel EJ, Van Keuren ML, Lashkari D, Kurnit DM. Use of a fluorescent-PCR reaction to detect genomic sequence copy number and transcriptional abundance. Genome Res 1996; 6:1013-26. [PMID: 8908521 DOI: 10.1101/gr.6.10.1013] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We present a fluorescent-PCR-based technique to assay genomic sequence copy number and transcriptional abundance. This technique relies on the ability to follow fluorescent PCR progressively in real time during the exponential phase of the reaction so that quantitative PCR is accomplished. We demonstrated the ability of this technique to quantitate both known deletions and amplifications of loci that have been measured previously by other methods, and to measure transcriptional abundance. Using an efficient variant of the fluorescent-PCR technology, we can monitor transcription semiquantitatively. The ability to detect all amplifications and deletions at any single copy locus by PCR makes this the technique of choice to assay genomic sequence copy number anomalies in birth defects and cancers. The ability to detect variations in transcript abundance enables this technique to fashion a time and tissue analysis of transcription.
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Affiliation(s)
- P W Chiang
- Department of Pediatrics, University of Michigan Medical School, Ann Arbor 48109-0650, USA.
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Wu KY, Hong SJ, Chung YM. Effects of dopamine antagonists and agonist on cultured human Tenon's fibroblast cells. Kaohsiung J Med Sci 1996; 12:388-93. [PMID: 8753140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
It was found that long-term therapy with topical antiglaucoma drugs may increase the number of fibroblasts and inflammatory cells in the conjunctiva and Tenon's capsule then decrease the success of glaucoma filtering surgery. Since some dopamine antagonists and agonists are reported to have ocular hypotensive effects, they could potentially be used as clinical antiglaucoma agents in future. In this study, several dopamine antagonists and agonists were evaluated in their effects on the fibroblast proliferation of ocular tissues with cultured human ocular Tenon's fibroblast cells. It was found that dopamine antagonists inhibited [3H]-thymidine uptake to 10.8%, 14.4%, 42.2% and 72.4% of control in domperidone, 28.6%, 67.7%, 96.9% and 99.2% in haloperidol, 9.8%, 18.9%, 103.5% and 104.6% in moperone and 9.8%, 24.7%, 70.8% and 96.9% in loxapine respectively, while the 0.5% concentration of drugs were dissolved in dimethyl sulfoxide (DMSO) followed by dilution in culture medium to final concentrations ranging from 0.05%, 0.005%, 0.0005% to 0.00005%. In the case of dopamine agonist, bromocriptine, the proliferation of cultured human Tenon's fibroblast cells was also inhibited for 25.1% of the control at 0.05% concentration and 92.3% of the control at 0.00005% concentration. These results indicate that these dopamine drugs have a potential long-term application in the treatment of glaucoma without having the stimulating effect on the proliferation of human Tenon's fibroblast cells.
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Affiliation(s)
- K Y Wu
- Department of Ophthalmology, Kaohsiung Medical College, Taiwan, Republic of China
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Preston CM, Wu KY, Molinski TF, DeLong EF. A psychrophilic crenarchaeon inhabits a marine sponge: Cenarchaeum symbiosum gen. nov., sp. nov. Proc Natl Acad Sci U S A 1996; 93:6241-6. [PMID: 8692799 PMCID: PMC39006 DOI: 10.1073/pnas.93.13.6241] [Citation(s) in RCA: 348] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Archaea, one of the three major domains of extant life, was thought to comprise predominantly microorganisms that inhabit extreme environments, inhospitable to most Eucarya and Bacteria. However, molecular phylogenetic surveys of native microbial assemblages are beginning to indicate that the evolutionary and physiological diversity of Archaea is far greater than previously supposed. We report here the discovery and preliminary characterization of a marine archaeon that inhabits the tissues of a temperate water sponge. The association was specific, with a single crenarchaeal phylotype inhabiting a single sponge host species. To our knowledge, this partnership represents the first described symbiosis involving Crenarchaeota. The symbiotic archaeon grows well at temperatures of 10 degrees C, over 60 degrees C below the growth temperature optimum of any cultivated species of Crenarchaeota. Archaea have been generally characterized as microorganisms that inhabit relatively circumscribed niches, largely high-temperature anaerobic environments. In contrast, data from molecular phylogenetic surveys, including this report, suggest that some crenarchaeotes have diversified considerably and are found in a wide variety of lifestyles and habitats. We present here the identification and initial description of Cenarchaeum symbiosum gen. nov., sp. nov., a symbiotic archaeon closely related to other nonthermophilic crenarchaeotes that inhabit diverse marine and terrestrial environments.
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Affiliation(s)
- C M Preston
- Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA 93106, USA
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Stein JL, Marsh TL, Wu KY, Shizuya H, DeLong EF. Characterization of uncultivated prokaryotes: isolation and analysis of a 40-kilobase-pair genome fragment from a planktonic marine archaeon. J Bacteriol 1996; 178:591-9. [PMID: 8550487 PMCID: PMC177699 DOI: 10.1128/jb.178.3.591-599.1996] [Citation(s) in RCA: 310] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
One potential approach for characterizing uncultivated prokaryotes from natural assemblages involves genomic analysis of DNA fragments retrieved directly from naturally occurring microbial biomass. In this study, we sought to isolate large genomic fragments from a widely distributed and relatively abundant but as yet uncultivated group of prokaryotes, the planktonic marine Archaea. A fosmid DNA library was prepared from a marine picoplankton assemblage collected at a depth of 200 m in the eastern North Pacific. We identified a 38.5-kbp recombinant fosmid clone which contained an archaeal small subunit ribosomal DNA gene. Phylogenetic analyses of the small subunit rRNA sequence demonstrated it close relationship to that of previously described planktonic archaea, which form a coherent group rooted deeply within the Crenarchaeota branch of the domain Archaea. Random shotgun sequencing of subcloned fragments of the archaeal fosmid clone revealed several genes which bore highest similarity to archaeal homologs, including large subunit ribosomal DNA and translation elongation factor 2 (EF2). Analyses of the inferred amino acid sequence of archaeoplankton EF2 supported its affiliation with the Crenarchaeote subdivision of Archaea. Two gene fragments encoding proteins not previously found in Archaea were also identified: RNA helicase, responsible for the ATP-dependent alteration of RNA secondary structure, and glutamate semialdehyde aminotransferase, an enzyme involved in initial steps of heme biosynthesis. In total, our results indicate that genomic analysis of large DNA fragments retrieved from mixed microbial assemblages can provide useful perspective on the physiological potential of abundant but as yet uncultivated prokaryotes.
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Affiliation(s)
- J L Stein
- Recombinant BioCatalysis, Inc., La Jolla, California 92037, USA
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Abstract
Biotransformation of chemical carcinogens involves both metabolic activation and detoxication. The molecular dose present on DNA as adducts represents a balance between these two pathways (formation) and DNA repair. All of these are enzymatic processes subject to saturation. When none of the pathways is saturated, linear molecular dosimetry is expected, whereas if metabolic activation is saturated, a supralinear response occurs. If detoxication or DNA repair is saturated, a sublinear response occurs. With chronic exposure, steady-state concentrations of DNA adducts develop and these follow the same patterns. With several alkylating agents, multiple adducts are formed. The extent of formation is chemically defined, but different DNA repair pathways can be involved for different adducts. By understanding the molecular dose and biology of each adduct and comparing these to the dose-response for tumor induction, it may be possible to identify the most appropriate biomarkers for risk assessment. Recently, endogenous DNA adducts identical to those induced by known human carcinogens have been identified. These endogenously formed adducts may play an important role in human carcinogenesis.
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Affiliation(s)
- J A Swenberg
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill 27599-7400, USA
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Abstract
We report the construction of a physical map based on cloned DNA within the candidate region for the tuberous sclerosis complex (TSC1) gene on chromosome 9q34, between the markers D9S149 and D9S66. The DNA clones form three contigs consisting of 7 YACs, bridged by P1 and cosmid clones, and cover more than 950 kb of 9q34. Despite intensive screening of all available libraries, two gaps remain. A detailed physical map of much of this region was derived, and restriction mapping of the YAC, P1, and cosmid clones reveals novel CpG islands in this region. This set of genomic clones provides a resource for characterizing candidates for the TSC1 gene, guided by the location of CpG islands.
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Affiliation(s)
- C Y Zhou
- Department of Pathology, University of Cambridge, United Kingdom
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Abstract
Archaea (archaebacteria) constitute one of the three major evolutionary lineages of life on Earth. Previously these prokaryotes were thought to predominate in only a few unusual and disparate niches, characterized by hypersaline, extremely hot, or strictly anoxic conditions. Recently, novel (uncultivated) phylotypes of Archaea have been detected in coastal and subsurface marine waters, but their abundance, distribution, physiology and ecology remain largely undescribed. Here we report exceptionally high archaeal abundance in frigid marine surface waters of Antarctica. Pelagic Archaea constituted up to 34% of the prokaryotic biomass in coastal Antarctic surface waters, and they were also abundant in a variety of other cold, pelagic marine environments. Because they can make up a significant fraction of picoplankton biomass in the vast habitats encompassed by cold and deep marine waters, these pelagic Archaea represent an unexpectedly abundant component of the Earth's biota.
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Affiliation(s)
- E F DeLong
- Biology Department, University of California, Santa Barbara 93106
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