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Wu Q, Xu R, Zhou X, Wang L, Sheng C, Ding M, Cao Y. Bolus administration of remimazolam was superior to midazolam for deep sedation in elderly patients undergoing diagnostic bronchoscopy: A randomized, double-blind, controlled trial. Medicine (Baltimore) 2024; 103:e37215. [PMID: 38518001 PMCID: PMC10956983 DOI: 10.1097/md.0000000000037215] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/24/2024] Open
Abstract
BACKGROUND To date, there is no standardized practice for the use of pharmacological sedatives during flexible bronchoscopy, particularly for elderly patients. This exploratory study aimed to assess the efficacy and safety of remimazolam at a single induced dose for deep sedation in elderly patients undergoing diagnostic flexible bronchoscopy (DFB), and compare with midazolam, a commonly used sedative. METHODS A total of 100 elderly patients (age range 65-80 yr; American Society of Anesthesiologists Physical Status I-III) undergoing DFB were randomly allocated into 2 groups according to the sedatives used for induction: the remimazolam group and the midazolam group. Sedation induction was initiated by an intravenous bolus of remimazolam (0.135 mg/kg) or midazolam (0.045 mg/kg), respectively, both groups were combined with a high-dose of alfentanil (18 µg/kg), and supplemented with high-flow nasal cannula (HFNC) oxygen supply at a flow rate of 45 L/min. If the target depth of sedation was not achieved, propofol would be titrated as a rescue. The primary outcome was the success rate of sedation at a single induced dose to achieve target depth (Ramsay sedation score [RSS] = 4) during induction, intraoperative changes in vital signs, postoperative follow-up situation and incidence of post-bronchoscopy adverse events were evaluated as secondary outcomes. RESULTS The success rate of sedation in the remimazolam group was significantly higher than that in the midazolam group (65.2% vs 39.6%, P = .013), while the incidence of extra sleep within 6 hours after procedure was lower in the remimazolam group as compared to the midazolam group (10.9% vs 31.3%, P = .016). No statistically significant differences were observed between the 2 groups regarding hemodynamic fluctuations, incidence of hypoxemia, and cough response during the procedure, as well as postoperative recall, willingness to undergo reexamination, and other post-bronchoscopy adverse events. CONCLUSIONS Bolus administration of remimazolam offers advantages over midazolam for deep sedation in elderly patients undergoing DFB, in terms of a higher success rate of sedation and a lower incidence of extra sleep within 6 hours after procedure, though the safety profiles of both groups were favorable.
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Affiliation(s)
- Qiuyue Wu
- School of Medicine, Ningbo University, Ningbo, China
- Department of Anesthesiology, Beilun District People's Hospital of Ningbo, Ningbo, China
| | - Rong Xu
- School of Medicine, Ningbo University, Ningbo, China
- Department of Anesthesiology, Beilun District People's Hospital of Ningbo, Ningbo, China
| | - Xuefei Zhou
- Department of Anesthesiology, Beilun District People's Hospital of Ningbo, Ningbo, China
| | - Longfei Wang
- Department of Anesthesiology, Qilu Hospital (Qingdao), Cheeloo College of Medicine, Shandong University, Qingdao, China
| | - Cheng Sheng
- Department of Anesthesiology, Beilun District People's Hospital of Ningbo, Ningbo, China
| | - Miao Ding
- Department of Anesthesiology, Beilun District People's Hospital of Ningbo, Ningbo, China
| | - Yunfei Cao
- Department of Anesthesiology, Beilun District People's Hospital of Ningbo, Ningbo, China
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2
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Sheng C, Ling Z, Xiao J, Yang K, Xie F, Ma S, Zhang W. Enantio- and Diastereoselective Synthesis of Chiral Tetrasubstituted α-Amino Allenoates Bearing a Vicinal All-Carbon Quaternary Stereocenter with Dual-Copper-Catalysis. Angew Chem Int Ed Engl 2023:e202305680. [PMID: 37261939 DOI: 10.1002/anie.202305680] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 04/24/2023] [Revised: 05/25/2023] [Accepted: 06/01/2023] [Indexed: 06/03/2023]
Abstract
The skeletons of chiral tetrasubstituted allenes bearing a vicinal all-carbon quaternary stereocenter are of importance but still challenging to synthesize. Herein, we report enantio- and diastereoselective γ-additions of 1-alkynyl ketimines with dual-copper-catalysis under mild conditions, affording chiral tetrasubstituted α-amino allenoates bearing a vicinal all-carbon quaternary stereocenter in high yields (up to 99% yield) with excellent enantioselectivities (up to 99% ee) and diastereoselectivities (up to >20:1 dr). Importantly, the stereodivergent synthesis of the products was realized by the asymmetric γ-addition reaction and the Grignard reagent promoted epimerization. Moreover, the dual-copper-catalyzed γ-addition reactions were smoothly applied to a gram-scale reaction and adopted to introduce chiral tetrasubstituted allenyl moieties into bioactive molecules. Mechanistic experiments and density functional theory (DFT) calculations demonstrated that the asymmetric γ-addition reactions were catalyzed by double chiral copper catalysts.
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Affiliation(s)
- Cheng Sheng
- Shanghai Jiao Tong University, School of Chemistry and Chemical Engineering, 800 Dongchuan Road, Shanghai, 800 Dongchuan Road, Shanghai, 200240, Shanghai, CHINA
| | - Zheng Ling
- Shanghai Jiao Tong University, School of Chemistry and Chemical Engineering, CHINA
| | - Junzhe Xiao
- Shanghai Institute of Organic Chemistry, State Key Laboratory of Organometallic Chemistry, CHINA
| | - Kai Yang
- Shanghai Jiao Tong University, School of Chemistry and Chemical Engineering, CHINA
| | - Fang Xie
- Shanghai Jiao Tong University, School of Chemistry and Chemical Engineering, CHINA
| | - Shengming Ma
- Shanghai Institute of Organic Chemistry, State Key Laboratory of Organometallic Chemistry, CHINA
| | - Wanbin Zhang
- Shanghai Jiao Tong University, School of Chemistry and Chemical Engineering, 800 Dongchuan Road, 200240, Shanghai, CHINA
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3
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Tang L, Luo Y, Sheng C, Xie F, Zhang W. Cu-Catalyzed Asymmetric Kinetic Boron Conjugate Addition of γ-Substituted α,β-Unsaturated γ-Lactams. Angew Chem Int Ed Engl 2023:e202304640. [PMID: 37070236 DOI: 10.1002/anie.202304640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 04/15/2023] [Accepted: 04/17/2023] [Indexed: 04/19/2023]
Abstract
Chiral α,β-unsaturated γ-lactams bearing simple γ- substituents are found in biologically active molecules and natural products, however, their synthesis still remains difficult. Herein, we report an efficient kinetic resolution of γ-substituted α,β-unsaturated γ-lactams via a Cu-catalyzed asymmetric boron conjugate addition, which also leads to the efficient synthesis of chiral β-hydroxy-γ-lactams with β,γ-stereogenic carbon centers. The kinetic resolution proceeded smoothly with a wide range of γ-alkyl or aryl substituted substrates including those bearing aromatic heterocycles and different N-protected substrates in up to 347 of s value. Their highly versatile transformations, synthetic utility in biologically active molecules, and inhibitory activities against cisplatin-sensitive ovarian cancer cell A2780 have also been demonstrated. Differing from the well-known mechanism involving Cu-B species in Cu-catalyzed boron conjugate additions, our mechanistic studies using DFT calculations and experiments indicate that a Lewis acid Cu(I)-catalyzed mechanism is the likely pathway in the catalytic reaction.
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Affiliation(s)
- Liang Tang
- Shanghai Jiao Tong University, School of Chemistry and Chemical Engineering, CHINA
| | - Yicong Luo
- Shanghai Jiao Tong University, School of Chemistry and Chemical Engineering, CHINA
| | - Cheng Sheng
- Shanghai Jiao Tong University, School of Chemistry and Chemical Engineering, CHINA
| | - Fang Xie
- Shanghai Jiao Tong University, School of Chemistry and Chemical Engineering, CHINA
| | - Wanbin Zhang
- Shanghai Jiao Tong University, School of Chemistry and Chemical Engineering, 800 Dongchuan Road, 200240, Shanghai, CHINA
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4
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Wang L, Wu Q, Wang M, Ming W, Sheng C, Zhang Y, Chen Y, Cao Y. The safety and efficacy of alfentanil combined with midazolam in fiberoptic bronchoscopy sedation: A randomized, double-blind, controlled trial. Front Pharmacol 2022; 13:1036840. [PMID: 36339547 PMCID: PMC9634630 DOI: 10.3389/fphar.2022.1036840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 10/10/2022] [Indexed: 11/13/2022] Open
Abstract
Sedation is recommended by most guidelines to be offered to all patients undergoing diagnostic flexible bronchoscopy (DFB) without contraindications, and the most commonly reported regimen is midazolam in combination with a short-acting opioid (fentanyl or alfentanil) to provide both sedative and antitussive effects. However, the optimal dose or ideal regimen of the combination therapy with midazolam and opioids has not yet been found. So this randomized, double-blinded clinical trial was designed and registered (ChiCTR2100049052) to assess the safety and efficacy of midazolam combined with different doses of alfentanil in DFB sedation. Our study showed that relative high doses of alfentanil (10–25 μg/kg) combined with a fixed low dose of midazolam can markedly reduce hemodynamic fluctuations, cough reactions, patients’ discomforts, and improve their satisfaction in a dose-dependent manner during DFB, with no significant increase in the desaturation risks.
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Affiliation(s)
- Longfei Wang
- School of Medicine, Ningbo University, Ningbo, China
| | - Qiuyue Wu
- School of Medicine, Ningbo University, Ningbo, China
| | - Ming Wang
- School of Medicine, Ningbo University, Ningbo, China
| | - Wanquan Ming
- Department of Anesthesiology, Beilun District People’s Hospital of Ningbo, Ningbo, China
| | - Cheng Sheng
- Department of Anesthesiology, Beilun District People’s Hospital of Ningbo, Ningbo, China
| | - Yonghua Zhang
- Department of Pulmonary, Beilun District People’s Hospital of Ningbo, Ningbo, China
| | - Yongbin Chen
- Department of Pulmonary, Beilun District People’s Hospital of Ningbo, Ningbo, China
| | - Yunfei Cao
- Department of Anesthesiology, Beilun District People’s Hospital of Ningbo, Ningbo, China
- *Correspondence: Yunfei Cao,
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5
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Sheng C, Ling Z, Ahmad T, Xie F, Zhang W. Copper‐Catalyzed Regioselective [3+3] Annulations of Alkynyl Ketimines with
α
‐Cyano Ketones: the Synthesis of Polysubstituted 4
H
‐Pyran Derivatives with a CF
3
‐Containing Quaternary Center. Chemistry 2022; 28:e202200128. [DOI: 10.1002/chem.202200128] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Indexed: 12/17/2022]
Affiliation(s)
- Cheng Sheng
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontier Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
| | - Zheng Ling
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontier Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
| | - Tanveer Ahmad
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontier Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
| | - Fang Xie
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontier Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
| | - Wanbin Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontier Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
- College of Chemistry Zhengzhou University Zhengzhou 450052 China
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Sheng C, Hou J, He X, Wang K, Guo R, Zhuang J, Mamat B, Xu P, Liu M, Wang J, Zhan M. Defect-Free Arbitrary-Geometry Assembly of Mixed-Species Atom Arrays. Phys Rev Lett 2022; 128:083202. [PMID: 35275661 DOI: 10.1103/physrevlett.128.083202] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 11/04/2021] [Accepted: 11/24/2021] [Indexed: 06/14/2023]
Abstract
Optically trapped mixed-species single atom arrays with arbitrary geometry are an attractive and promising platform for various applications, because tunable quantum systems with multiple components provide extra degrees of freedom for experimental control. Here, we report the first demonstration of two-dimensional 6×4 dual-species atom assembly of ^{85}Rb (^{87}Rb) atoms with a filling fraction of 0.88 (0.89). This mixed-species atomic synthesis is achieved via rearranging initially randomly distributed atoms by a sorting algorithm (heuristic heteronuclear algorithm) which is designed for bottom-up atom assembly with both user-defined geometries and two-species atom number ratios. Our fully tunable hybrid-atom systems with scalable advantages are a good starting point for high-fidelity quantum logic, many-body quantum simulation, and single molecule array formation.
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Affiliation(s)
- Cheng Sheng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jiayi Hou
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaodong He
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Kunpeng Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Ruijun Guo
- School of Information Engineering and Henan Key Laboratory of Laser and Opto-Electric Information Technology, Zhengzhou University, Zhengzhou 450001, China
| | - Jun Zhuang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bahtiyar Mamat
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Peng Xu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Min Liu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jin Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Mingsheng Zhan
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
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7
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Sheng C, Ling Z, Luo Y, Zhang W. Cu-catalyzed asymmetric addition of alcohols to β,γ-alkynyl-α-imino esters for the construction of linear chiral N,O-ketals. Nat Commun 2022; 13:400. [PMID: 35058446 PMCID: PMC8776757 DOI: 10.1038/s41467-022-28002-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 12/19/2021] [Indexed: 12/01/2022] Open
Abstract
N,O-acetals are part of many synthetic intermediates and important skeletons of numerous natural products and pharmaceutical drugs. The most straightforward method of the synthesis of N,O-acetals is the enantioselective addition of O-nucleophiles to imines. However, using this method for the synthesis of linear chiral N,O-ketals still remains challenging due to the instability of raw materials under acidic or basic conditions. Herein, we developed a Cu-catalyzed asymmetric addition of alcohols to β,γ-alkynyl-α-imino esters under mild conditions, providing the corresponding linear chiral N,O-ketals with up to 96% ee. The method tolerates some variation in the β,γ-alkynyl-α-imino ester and alcohol scope, including some glucose and natural amino acid derivatives. Computational results indicate that the Boc group of the substrates assist in the extraction of hydrogen atoms from the alcohols to promote the addition reactions. These products could be synthesized on a gram-scale and can be used in several transformations. This asymmetric addition system provides an efficient, mild, gram-scale, and transition-metal-catalyzed synthesis of linear chiral N,O-ketals. N,O-acetals are part of many synthetic intermediates and important skeletons of numerous natural products and pharmaceutical drugs. Here the authors show a Cu-catalyzed asymmetric addition of alcohols to β,γ-alkynyl-α-imino esters, providing the corresponding linear chiral N,O-ketals with up to 96% ee.
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8
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Li WQ, Yang L, Wang SF, Zhang LW, Sheng C, Huang YB. [Application of multi-stage competing risk model to survival data]. Zhonghua Yu Fang Yi Xue Za Zhi 2021; 55:1524-1529. [PMID: 34963255 DOI: 10.3760/cma.j.cn112150-20211103-01019] [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: 06/14/2023]
Abstract
The traditional proportional hazard model is commonly used to investigate the association between main outcome and predictor variables. However, the endpoints in medical studies are often not unique. The analyses of labeling other competing outcomes other than the main outcome as censored data will theoretically lead to a biased estimate of the risk of main outcome. Although the traditional competitive risk model can adjust the influence of other outcomes on the risk of the main outcome, it can not directly compare the differences on the risks of different outcomes. The multi-state competing risk model provides a relatively suitable solution for this problem. In this study, based on a previously published follow-up data set for prostate cancer patients, we developed traditional proportional hazard model, traditional competitive risk model, and multi-state competing risk model, respectively. By comparing the advantages and disadvantages of the three models with the same survival data, we clarified the clinical application value of the multi-state competitive risk model in survival data with multiple outcomes.
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Affiliation(s)
- W Q Li
- Project Office, Tianjin Women's and Children's Health Center, Tianjin 300070, China
| | - L Yang
- Beijing Office for Cancer Prevention and Control, Peking University Cancer Hospital & Institute, Beijing 100142, China
| | - S F Wang
- Department of Epidemiology & Bio-statistics, School of Public Health, Peking University Health Science Center, Beijing 100191, China
| | - L W Zhang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - C Sheng
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Y B Huang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
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9
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Zhang Y, Lyu ZY, Yang L, Wang SF, Zhang LW, Sheng C, Wang ZP, Zhang YC, Wang H, Huang YB, Chen KX. [Potential pleiotropism of cancer-related single nucleotide polymorphisms among Chinese population]. Zhonghua Yu Fang Yi Xue Za Zhi 2021; 55:1203-1208. [PMID: 34706505 DOI: 10.3760/cma.j.cn112150-20201121-01390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the potential pleiotropism of cancer-related single nucleotide polymorphisms (SNPs) among Chinese population. Methods: Based on the catalogue of GWAS jointly constructed by the National Human Genome Research Institute and the European Institute of Bioinformatics, according to population origin (Chinese population and non-Chinese population) and disease traits (cancer and non-cancer traits). All SNPs found by GWAS before August 2020 were divided into four categories: cancer in Chinese population, non-cancer in Chinese population, cancer in non-Chinese population and non-cancer in non-Chinese population. The number, correlation and linkage of the four categories of SNPs were described. Results: By August 2020, a total of 196 813 SNPs from 4 096 GWAS were included in the GWAS directory. The information that SNPs refer to unknown or were not related to the disease was excluded, and 117 441 independent SNPs were finally included. There were 619 SNPs related to cancer and 9 569 SNPs related to non-cancer disease in Chinese population, respectively. There were 4 624 SNPs related to cancer and 106 448 SNPs related to non-cancer disease (trait) in non-Chinese population, respectively. Three SNPs, rs2736100, rs6983267 and rs401681, were associated with two or more types of cancer in both Chinese and non-Chinese populations. Seven SNPs, rs7705526, rs2736100, rs10993994, rs2735839, rs4430796, rs174537 and rs9271588, were associated with cancer and non-cancer diseases in both Chinese and non-Chinese populations, respectively. Conclusion: There is a potential pleiotropism of cancer-related SNPs in Chinese population.
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Affiliation(s)
- Y Zhang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Z Y Lyu
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - L Yang
- Beijing Office for Cancer Prevention and Control, Peking University Cancer Hospital & Institute, Beijing 100142, China
| | - S F Wang
- Department of Epidemiology & Bio-statistics, School of Public Health, Peking University Health Science Center, Beijing 100191, China
| | - L W Zhang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - C Sheng
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Z P Wang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Y C Zhang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - H Wang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Y B Huang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - K X Chen
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
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10
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Sheng C, Deng Y, Gabrielse C, Lyons LR, Nishimura Y, Heelis RA, Chen Y. Sensitivity of Upper Atmosphere to Different Characteristics of Flow Bursts in the Auroral Zone. J Geophys Res Space Phys 2021; 126:e2021JA029253. [PMID: 35845984 PMCID: PMC9285067 DOI: 10.1029/2021ja029253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 09/11/2021] [Accepted: 09/19/2021] [Indexed: 06/15/2023]
Abstract
Meso-scale plasma convection and particle precipitation could be significant momentum and energy sources for the ionosphere-thermosphere (I-T) system. Following our previous work on the I-T response to a typical midnight flow burst, flow bursts with different characteristics (lifetime, size, and speed) have been examined systematically with Global Ionosphere-Thermosphere Model (GITM) simulations in this study. Differences between simulations with and without additional flow bursts are used to illustrate the impact of flow bursts on the I-T system. The neutral density perturbation due to a flow burst increases with the lifetime, size, and flow speed of the flow burst. It was found that the neutral density perturbation is most sensitive to the size of a flow burst, increasing from ∼0.3% to ∼1.3% when the size changes from 80 to 200 km. A westward-eastward asymmetry has been identified in neutral density, wind, and temperature perturbations, which may be due to the changing of the forcing location in geographic coordinates and the asymmetrical background state of the I-T system. In addition to midnight flow bursts, simulations with flow bursts centered at noon, dawn, and dusk have also been carried out. A flow burst centered at noon (12.0 Local Time [LT], 73°N) produces the weakest perturbation, and a flow burst centered at dusk (18.0 LT, 71°N) produces the strongest. Single-cell and two-cell flow bursts induce very similar neutral density perturbation patterns.
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Affiliation(s)
- Cheng Sheng
- Department of PhysicsUniversity of Texas at ArlingtonArlingtonTXUSA
| | - Yue Deng
- Department of PhysicsUniversity of Texas at ArlingtonArlingtonTXUSA
| | | | - Larry R. Lyons
- Department of Atmospheric and Oceanic SciencesUniversity of California Los AngelesLos AngelesCAUSA
| | - Yukitoshi Nishimura
- Center for Space Physics and Department of Electrical and Computer EngineeringBoston UniversityBostonMAUSA
| | | | - Yun‐Ju Chen
- Department of PhysicsUniversity of Texas at DallasRichardsonTXUSA
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11
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Zhang M, Sheng C, You H, Cai M, Gao J, Cheng X, Sheng H, Qu S. Comparing the bone mineral density among male patients with latent autoimmune diabetes and classical type 1 and type 2 diabetes, and exploring risk factors for osteoporosis. J Endocrinol Invest 2021; 44:1659-1665. [PMID: 33387352 DOI: 10.1007/s40618-020-01472-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 11/21/2020] [Indexed: 12/21/2022]
Abstract
AIMS This study aimed to compare the bone mineral densities (BMDs) among male patients with latent autoimmune diabetes in adults (LADA), classical type 1 diabetes (T1DM), and type 2 diabetes (T2DM), and to examine the risk factors for developing low BMD in these patients. PATIENTS AND METHODS Between January 2017 and October 2020, a total of 57, 67, and 223 male patients with LADA, classical T1DM, and T2DM, respectively, were recruited from the endocrinology department of Shanghai Tenth People's Hospital. Hormonal markers of bone metabolism, lipid profiles, uric acid, glycosylated hemoglobin A1c (HbA1c), and beta-cell function were measured using blood samples. BMD was measured at the lumbar spine, femoral neck, and right hip by dual-energy X-ray absorptiometry. RESULTS The mean BMD values from all three skeletal sites in male patients with LADA were comparable to those with classical T1DM but were much lower than those with T2DM. After adjusting for confounding factors, multiple linear regression analysis demonstrated that in all male patients with diabetes, body mass index (BMI), uric acid, and fasting C-peptide showed significant positive associations with BMD at all three skeletal sites; however, osteocalcin showed a negative association at all three sites. CONCLUSIONS Compared with male patients with T2DM, lower BMDs were observed in patients with LADA and T1DM. Low BMI, uric acid, C-peptide levels, and high osteocalcin levels are risk factors for developing low BMD in male patients with diabetes.
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Affiliation(s)
- M Zhang
- Department of Endocrinology and Metabolism, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Middle Yanchang Road, Shanghai, 200072, China.
| | - C Sheng
- Department of Endocrinology and Metabolism, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Middle Yanchang Road, Shanghai, 200072, China
| | - H You
- Department of Endocrinology and Metabolism, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Middle Yanchang Road, Shanghai, 200072, China
| | - M Cai
- Department of Endocrinology and Metabolism, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Middle Yanchang Road, Shanghai, 200072, China
| | - J Gao
- Department of Endocrinology and Metabolism, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Middle Yanchang Road, Shanghai, 200072, China
| | - X Cheng
- Department of Endocrinology and Metabolism, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Middle Yanchang Road, Shanghai, 200072, China
| | - H Sheng
- Department of Endocrinology and Metabolism, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Middle Yanchang Road, Shanghai, 200072, China
| | - S Qu
- Department of Endocrinology and Metabolism, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Middle Yanchang Road, Shanghai, 200072, China
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12
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Huangfu G, Li L, Zhang Z, Sheng C. Moral metaphorical effect of cleanliness on immoral workplace behaviors. Journal of Pacific Rim Psychology 2021. [DOI: 10.1177/18344909211034257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Cleanliness connotes cleanness, hygiene, and beauty. Physical cleanliness is also a metaphor for moral purity, as proposed in recent literature. However, cleanliness means not only physical cleanliness but also environmental cleanliness. The article proposes that environmental cleanliness and physical self-cleanliness may metaphorically influence immoral behaviors in the workplace, and their effects may be different. The current study conducted a 2 (environmental cleanliness: clean vs. dirty) × 3 (self-cleanliness: hands-cleansing vs. face-cleansing vs. non-cleansing) between-subjects field experiment with employees as participants in a Chinese enterprise. One-hundred-seventy-seven employees volunteered to participate in the experiment. It was found that a clean workplace, rather than physical self-cleansing, renders harsh moral judgment regarding immoral workplace behaviors. The participants were less willing to accept immoral workplace behaviors in a clean environment than in a dirty environment, while self-cleanliness (hands-cleansing or face-cleansing vs. non-cleansing) had no significant influence on employees’ moral judgments of immoral workplace behaviors. In addition, the significant effects of environmental cleanliness were found in all the ten dimensions of immoral workplace behaviors. The findings reveal the metaphorical association between environmental cleanliness and the concept of higher social moral norms, and confirm that environmental cleanliness is a key factor leading to moral metaphorical effects. This result provides unique insight to the social significance of environmental cleanliness, and has important implications to prevent immoral workplace behaviors. A theoretical framework is proposed to explain why environmental cleanliness is more likely to affect moral judgment involving organizational interests than self-cleanliness. Considering most previous research has been done with samples of college students, this study is especially valuable through a field experiment on actual employees.
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Affiliation(s)
- Gang Huangfu
- School of Economics and Management, Communication University of China, Beijing, China
| | - Lu Li
- School of Government, University of Chinese Academy of Social Sciences, Beijing, China
| | - Zhen Zhang
- College of Business & Public Management, University of La Verne, University of La Verne, CA, USA
| | - Cheng Sheng
- School of Economics and Management, Beihang University, Beihang University, Beijing, China
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13
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Chu L, Zhao J, Sheng C, Yue M, Wang F, Song S, Cheng B, Xie G, Fang X. Confocal laser endomicroscopy under propofol-based sedation for early gastric cancer and pre-cancerous lesions is associated with better diagnostic accuracy: a retrospective cohort study in China. BMC Anesthesiol 2021; 21:97. [PMID: 33784972 PMCID: PMC8008607 DOI: 10.1186/s12871-021-01312-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 03/21/2021] [Indexed: 02/08/2023] Open
Abstract
Background Confocal laser endomicroscopy (CLE) has advantages in detecting gastric neoplastic lesions, meanwhile it requires strict patient cooperation. Sedation could improve patient cooperation and quality of endoscopy. However, sedation is still not very popular in some resource-limited countries and regions. The purpose of this study was to compare propofol-based sedated versus un-sedated CLE in the value of diagnosing early gastric cancer (EGC) and precancerous lesions. Methods A retrospective, cohort, single center study of 226 patients who underwent CLE between January 1, 2015 and December 31, 2017 was performed. Patients enrolled were allocated into the propofol-based sedated group (n = 126) and the un-sedated group (n = 100). The comparison of validity and reliability of CLE for identifying EGC and precancerous lesions between the two groups was performed through analyzing CLE diagnosis and pathological diagnosis. Reporting followed the STROBE guidelines. Results The area under receiver operating characteristic curve (AUROC) of diagnosing EGC in the sedated group was 0.97 (95 % CI: 0.95 to 0.99), which was higher than that in the un-sedated group (0.88 (95 % CI: 0.80 to 0.97), P = 0.0407). CLE with sedation performed better than without sedation in diagnosing intraepithelial neoplasia and intestinal metaplasia (P = 0.0008 and P = 0.0001, respectively). For patients considered as high-grade intraepithelial neoplasia or EGC by endoscopists, they would not get biopsy during CLE but receive endoscopic submucosal dissection (ESD) subsequently, and the misdiagnosis rate of CLE was 0 % in the sedated group and 27.59 % (95 % CI: 10.30–44.91 %) in the un-sedated group (P = 0.006). Conclusions Propofol based sedation was associated with improved diagnostic value of CLE for detecting EGC as well as precancerous lesions (intraepithelial neoplasia OR intestinal metaplasia).
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Affiliation(s)
- Lihua Chu
- Department of Anesthesiology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, Hangzhou, China
| | - Jialian Zhao
- Department of Anesthesiology, the Children's Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Cheng Sheng
- Department of Anesthesiology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, Hangzhou, China.,Department of Anesthesiology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Beilun District, Ningbo, China
| | - Min Yue
- Department of Gastroenterology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Feifei Wang
- Department of Intensive Care Unit, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Shengwen Song
- Department of Anesthesiology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, Hangzhou, China
| | - Baoli Cheng
- Department of Anesthesiology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, Hangzhou, China.
| | - Guohao Xie
- Department of Anesthesiology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, Hangzhou, China.
| | - Xiangming Fang
- Department of Anesthesiology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang, Hangzhou, China
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14
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Sheng C, Zhang S, Zhang Y. The influence of different polymer types of microplastics on adsorption, accumulation, and toxicity of triclosan in zebrafish. J Hazard Mater 2021; 402:123733. [PMID: 33254764 DOI: 10.1016/j.jhazmat.2020.123733] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 08/10/2020] [Accepted: 08/13/2020] [Indexed: 05/23/2023]
Abstract
Although the combined effects of microplastics (MPs) and other organic pollutants have raised increasing attention, the impacts of polymer types on the biological effects (e.g., bioaccumulation and toxicity) of the mixtures are still unclear. This study aimed to evaluate the influence of different polymer types of MPs including polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC) on the adsorption, accumulation, and toxic effects of triclosan (TCS) in zebrafish. As a result, all three types of MPs could adsorb TCS and PP-MPs has the highest adsorption capacity for TCS (1.18 mg/g). Compared with the TCS alone, MPs changed the distribution of TCS in tissues and increased the accumulation of TCS in the liver and gut following the order of TCS + PP > TCS + PVC > TCS + PE. Compared with individual TCS and PP-MPs, after co-exposed for 28 days, TCS + PP significantly aggravated oxidative stress and lipid peroxidation in the liver as well as enhanced neurotoxicity in the brain. Moreover, TCS + PP disturbed the metabolism in the liver and MPs contributed more to the metabolic disorders. The upregulated lipid metabolites (e.g., sphingosine and L-palmitoylcarnitine) and downregulated carbohydrate metabolites (e.g., sucrose) could be potential targets for future risk assessment of MPs combined with other pollutants.
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Affiliation(s)
- Cheng Sheng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China
| | - Shenghu Zhang
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, Jiangsu, 210042, China
| | - Yan Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China.
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15
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Sheng C, Zhao Y, Duan C, Dong L, Zhang P. Theoretical Analysis and Optimization of Fine Lignite Drying and Separation with a Pulsed Fluidized Bed. ACS Omega 2020; 5:29199-29208. [PMID: 33225151 PMCID: PMC7675562 DOI: 10.1021/acsomega.0c03967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 10/22/2020] [Indexed: 06/11/2023]
Abstract
We established a pulsed fluidized bed system to dry and concurrently separate fine lignite (-6 + 3 and -3 + 1 mm lignite). The kinetics and evaporation of lignite moisture were investigated in the pulsed air flow. The variation in the evaporation rate was studied theoretically with respect to temperature, velocity of the pulsed air flow, and pulsed frequency. The rubbing effect between the air and lignite particle probably dominates the evaporation of water. The influence of temperature on the evaporation rate is more significant than that of air velocity by merely considering the effect of air entrainment of the evaporated moisture. Four operational parameters, including inlet temperature, air velocity, pulsating frequency, and bed height, were investigated and optimized through a response surface method to study the interactions between factors and determine the optimal separation conditions. Results indicate that the maximum standard deviation of the ash content of 23.74% was recorded under the optimal condition of the inlet temperature (80 °C), pulsating frequency (3.93 Hz), air velocity (1.09 m/s), and bed height (120 mm) for -6 + 3 mm lignite, and the maximum standard deviation of 24.99% was recorded for -3 + 1 mm lignite under the condition of the inlet temperature (100 °C), pulsating frequency (3.49 Hz), air velocity (0.55 m/s), and bed height (80 mm). The probable error values of separations of -6 + 3 mm lignite and -3 + 1 mm lignite with the pulsed fluidized bed were 0.12-0.16 and 0.10-0.16 g/cm3, respectively, which demonstrates that efficient drying and simultaneous separation of lignite can be achieved with the pulsed fluidized bed.
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Affiliation(s)
| | | | | | - Liang Dong
- . Phone: +86 516 83591102. Fax: +86 516 83591101
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16
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He X, Wang K, Zhuang J, Xu P, Gao X, Guo R, Sheng C, Liu M, Wang J, Li J, Shlyapnikov GV, Zhan M. Coherently forming a single molecule in an optical trap. Science 2020; 370:331-335. [PMID: 32972992 DOI: 10.1126/science.aba7468] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Accepted: 08/27/2020] [Indexed: 11/02/2022]
Abstract
Ultracold single molecules have wide-ranging potential applications, such as ultracold chemistry, precision measurements, quantum simulation, and quantum computation. However, given the difficulty of achieving full control of a complex atom-molecule system, the coherent formation of single molecules remains a challenge. Here, we report an alternative route to coherently bind two atoms into a weakly bound molecule at megahertz levels by coupling atomic spins to their two-body relative motion in a strongly focused laser with inherent polarization gradients. The coherent nature is demonstrated by long-lived atom-molecule Rabi oscillations. We further manipulate the motional levels of the molecules and measure the binding energy precisely. This work opens the door to full control of all degrees of freedom in atom-molecule systems.
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Affiliation(s)
- Xiaodong He
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China. .,Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Kunpeng Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China.,Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jun Zhuang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China.,Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Peng Xu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China.,Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Xiang Gao
- Institute for Theoretical Physics, Vienna University of Technology, A-1040 Vienna, Austria.,Beijing Computational Science Research Center, Beijing 100193, China
| | - Ruijun Guo
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China.,Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Cheng Sheng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China.,Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Min Liu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China.,Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jin Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China.,Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jiaming Li
- Department of Physics and Center for Atomic and Molecular Nanosciences, Tsinghua University, Beijing 100084, China.,Key Laboratory for Laser Plasmas (Ministry of Education), and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.,Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - G V Shlyapnikov
- LPTMS, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay, France.,Russian Quantum Center, Skolkovo, Moscow 121025, Russia.,Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098 XH Amsterdam, Netherlands
| | - Mingsheng Zhan
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China. .,Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
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17
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Guo R, He X, Sheng C, Yang J, Xu P, Wang K, Zhong J, Liu M, Wang J, Zhan M. Balanced Coherence Times of Atomic Qubits of Different Species in a Dual 3×3 Magic-Intensity Optical Dipole Trap Array. Phys Rev Lett 2020; 124:153201. [PMID: 32357028 DOI: 10.1103/physrevlett.124.153201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 03/30/2020] [Indexed: 06/11/2023]
Abstract
We construct a polarization-mediated magic-intensity (MI) optical dipole trap (ODT) array, in which the detrimental effects of light shifts on the mixed-species qubits are efficiently mitigated so that the coherence times of the mixed-species qubits are both substantially enhanced and balanced for the first time. This mixed-species magic trapping technique relies on the tunability of the coefficient of the third-order cross term and ground state hyperpolarizability, which are inherently dependent on the degree of circular polarization of the trapping laser. Experimentally, polarization of the ODT array for ^{85}Rb qubits is finely adjusted to a definite value so that its working magnetic field required for magic trapping amounts to the one required for magically trapping ^{87}Rb qubits in another ODT array with fully circular polarization. Ultimately, in such a polarization-mediated MI-ODT array, the coherence times of ^{87}Rb and ^{85}Rb qubits are, respectively, enhanced up to 891±47 ms and 943±35 ms. Moreover, we reveal that the noise of the elliptic polarization causes dephasing effect on the ^{85}Rb qubits but it could be efficiently mitigated by choosing the dynamical range of active polarization device. We also show that light shifts seen by qubits in an elliptically polarized MI-ODT can be more efficiently compensated due to the decrease in the ground state hyperpolarizability. It is anticipated that the novel mixed-species MI-ODT array is a versatile platform for building scalable quantum computers with neutral atoms.
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Affiliation(s)
- Ruijun Guo
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Xiaodong He
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Cheng Sheng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jiaheng Yang
- School of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao 266061, China
| | - Peng Xu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Kunpeng Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jiaqi Zhong
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Min Liu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jin Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Mingsheng Zhan
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, APM, Chinese Academy of Sciences, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
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18
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Qiao R, Sheng C, Lu Y, Zhang Y, Ren H, Lemos B. Microplastics induce intestinal inflammation, oxidative stress, and disorders of metabolome and microbiome in zebrafish. Sci Total Environ 2019; 662:246-253. [PMID: 30690359 DOI: 10.1016/j.scitotenv.2019.01.245] [Citation(s) in RCA: 418] [Impact Index Per Article: 83.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 01/16/2019] [Accepted: 01/20/2019] [Indexed: 05/20/2023]
Abstract
Microplastics (MPs) can be ingested by a variety of species and mainly accumulate in the gut. However, the consequences of MPs exposure in the gut are largely unknown. Here we evaluated the impacts of MPs exposure in zebrafish gut. Animals were experimentally exposed to polystyrene MPs (5-μm beads; 50 μg/L and 500 μg/L) for 21 days and monitored for alterations in tissue histology, enzymatic biomarkers, gut microbiome and metabolomic responses. Inflammation and oxidative stress were observed in the zebrafish gut after exposed to MPs. Furthermore, significant alterations in the gut microbiome and tissue metabolic profiles were observed, with most of these were associated with oxidative stress, inflammation and lipid metabolism. This study provides evidence that MPs exposure causes gut damage as well as alterations in gut metabolome and microbiome, yielding novel insights into the consequences of MPs exposure.
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Affiliation(s)
- Ruxia Qiao
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China
| | - Cheng Sheng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China
| | - Yifeng Lu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China
| | - Yan Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China.
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China
| | - Bernardo Lemos
- Program in Molecular and Integrative Physiological Sciences, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
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19
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Sheng C, He X, Xu P, Guo R, Wang K, Xiong Z, Liu M, Wang J, Zhan M. High-Fidelity Single-Qubit Gates on Neutral Atoms in a Two-Dimensional Magic-Intensity Optical Dipole Trap Array. Phys Rev Lett 2018; 121:240501. [PMID: 30608742 DOI: 10.1103/physrevlett.121.240501] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 09/04/2018] [Indexed: 06/09/2023]
Abstract
As a conventional approach, optical dipole trap (ODT) arrays with linear polarization have been widely used to assemble neutral-atom qubits for building a quantum computer. However, due to the inherent scalar differential light shifts (DLS) of qubit states induced by trapping fields, the microwave-driven gates acting on single qubits suffer from errors on the order of 10^{-3}. Here, we construct a DLS compensated ODT array based upon a recently developed magic-intensity trapping technique. In such a magic-intensity optical dipole trap (MI-ODT) array, the detrimental effects of DLS are efficiently mitigated so that the performance of global microwave-driven Clifford gates is significantly improved. Experimentally, we achieve an average error of (4.7±1.1)×10^{-5} per global gate, which is characterized by randomized benchmarking in a 4×4 MI-ODT array. Moreover, we experimentally study the correlation between the coherence time and gate errors in a single MI-ODT with an optimum error per gate of (3.0±0.7)×10^{-5}. Our demonstration shows that MI-ODT array is a versatile platform for building scalable quantum computers with neutral atoms.
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Affiliation(s)
- Cheng Sheng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences-Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Xiaodong He
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences-Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Peng Xu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences-Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Ruijun Guo
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences-Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Kunpeng Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences-Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Zongyuan Xiong
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences-Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Min Liu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences-Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jin Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences-Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Mingsheng Zhan
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences-Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
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20
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Schnepf A, Leitner D, Landl M, Lobet G, Mai TH, Morandage S, Sheng C, Zörner M, Vanderborght J, Vereecken H. CRootBox: a structural-functional modelling framework for root systems. Ann Bot 2018; 121:1033-1053. [PMID: 29432520 PMCID: PMC5906965 DOI: 10.1093/aob/mcx221] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 01/08/2018] [Indexed: 05/18/2023]
Abstract
Background and Aims Root architecture development determines the sites in soil where roots provide input of carbon and take up water and solutes. However, root architecture is difficult to determine experimentally when grown in opaque soil. Thus, root architecture models have been widely used and been further developed into functional-structural models that simulate the fate of water and solutes in the soil-root system. The root architecture model CRootBox presented here is a flexible framework to model root architecture and its interactions with static and dynamic soil environments. Methods CRootBox is a C++-based root architecture model with Python binding, so that CRootBox can be included via a shared library into any Python code. Output formats include VTP, DGF, RSML and a plain text file containing coordinates of root nodes. Furthermore, a database of published root architecture parameters was created. The capabilities of CRootBox for the unconfined growth of single root systems, as well as the different parameter sets, are highlighted in a freely available web application. Key results The capabilities of CRootBox are demonstrated through five different cases: (1) free growth of individual root systems; (2) growth of root systems in containers as a way to mimic experimental setups; (3) field-scale simulation; (4) root growth as affected by heterogeneous, static soil conditions; and (5) coupling CRootBox with code from the book Soil physics with Python to dynamically compute water flow in soil, root water uptake and water flow inside roots. Conclusions CRootBox is a fast and flexible functional-structural root model that is based on state-of-the-art computational science methods. Its aim is to facilitate modelling of root responses to environmental conditions as well as the impact of roots on soil. In the future, this approach will be extended to the above-ground part of the plant.
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Affiliation(s)
- Andrea Schnepf
- Forschungszentrum Juelich GmbH, Agrosphere (IBG-3), Juelich, Germany
| | | | - Magdalena Landl
- Forschungszentrum Juelich GmbH, Agrosphere (IBG-3), Juelich, Germany
| | - Guillaume Lobet
- Forschungszentrum Juelich GmbH, Agrosphere (IBG-3), Juelich, Germany
| | - Trung Hieu Mai
- Forschungszentrum Juelich GmbH, Agrosphere (IBG-3), Juelich, Germany
| | - Shehan Morandage
- Forschungszentrum Juelich GmbH, Agrosphere (IBG-3), Juelich, Germany
| | - Cheng Sheng
- Forschungszentrum Juelich GmbH, Agrosphere (IBG-3), Juelich, Germany
| | - Mirjam Zörner
- Forschungszentrum Juelich GmbH, Agrosphere (IBG-3), Juelich, Germany
| | - Jan Vanderborght
- Forschungszentrum Juelich GmbH, Agrosphere (IBG-3), Juelich, Germany
| | - Harry Vereecken
- Forschungszentrum Juelich GmbH, Agrosphere (IBG-3), Juelich, Germany
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Abstract
We examined the association between workplace environment cleanliness and employees' judgment of counterproductive work behavior (CWB). We recruited 59 participants who were employees of a large company in China, and assigned 28 to a clean workroom and 31 to a dirty workroom. We measured
their judgment of whether or not behavior was acceptable, using the Counterproductive Work Behavior Checklist. Results showed that participants working in a clean environment tended to regard CWB as less acceptable than did those in a dirty environment, that is, a cleaner environment led to
harsher judgment. Results suggested that there is a metaphorical association between environmental cleanliness and moral judgment. Theoretical and practical implications are discussed.
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22
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Li Y, Zhang M, Liu X, Cui W, Rampersad S, Li F, Lin Z, Yang P, Li H, Sheng C, Cheng X, Qu S. Correlates and prevalence of hypogonadism in patients with early- and late-onset type 2 diabetes. Andrology 2017; 5:739-743. [PMID: 28470687 DOI: 10.1111/andr.12360] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 02/16/2017] [Accepted: 02/19/2017] [Indexed: 01/14/2023]
Affiliation(s)
- Y. Li
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
- Nanjing Medical University; Nanjing China
| | - M. Zhang
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
| | - X. Liu
- Department of Urology; Putuo District People's Hospital; Shanghai China
| | - W. Cui
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
| | - S. Rampersad
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
| | - F. Li
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
| | - Z. Lin
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
| | - P. Yang
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
| | - H. Li
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
| | - C. Sheng
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
| | - X. Cheng
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
| | - S. Qu
- Department of Endocrinology & Metabolism; Shanghai Tenth People's Hospital; Tongji University School of Medicine; Shanghai China
- Nanjing Medical University; Nanjing China
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23
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Wang SY, Wang M, Wang XX, Chen W, Sheng C, Gong ZK. Study on the clinical application of the MRS in the cognitive assessment after stroke. Eur Rev Med Pharmacol Sci 2017; 21:2437-2442. [PMID: 28617543] [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
OBJECTIVE To discuss the value of the application of the magnetic resonance spectroscopy (MRS) in the assessment of cognitive function impairment and the observation of therapeutic effect. PATIENTS AND METHODS 30 patients with cognitive impairment after stroke (cognitive impairment group) and 30 patients with no apparent cognitive impairment (control group of the stroke) were selected through the screening of the mini-mental state examination (MMSE) scale, and another 30 healthy volunteers were selected (control group of the health). The general information of gender, age, education degree, disease duration and so on was matched among the 3 groups. MRS examined all the patients of the 3 groups at the time of enrollment, and the patients of both cognitive impairment and control groups received another assessment 2 months after treatment. RESULTS The NAA/Cr (N-acetyl aspartate/creatine) of the bilateral hippocampus of the cognitive impairment group was lower than those of both control group of stroke and health (p < 0.05), while the Cho/Cr was higher (p < 0.05). After treatment, both patients of the cognitive impairment group and the control group of the stroke experienced an increase of NAA/Cr and a decrease of Cho/Cr (p < 0.05). CONCLUSIONS MRS is applicative in the assessment of the cognitive impairment degree of the stroke patients and can also effectively identify the existence of the cognitive impairment, which makes it preferably valuable in the clinical application.
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Affiliation(s)
- S-Y Wang
- Department of Rehabilitation Medicine, Xuzhou Center Hospital, Affiliated to Nanjing University of Traditional Chinese Medicine, Xuzhou, China.
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24
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Sheng C, Duan C, Zhao Y, Zhou C, Zhang Y. Simulation and experimental research on coarse coal slime particles’ separation in inclined tapered diameter separation bed. CAN J CHEM ENG 2017. [DOI: 10.1002/cjce.22832] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Cheng Sheng
- Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, School of Chemical Engineering and Technology; China University of Mining and Technology; Xuzhou 221116 China
- Forschungszentrum Jülich; Jülich 52428 Germany
| | - Chenlong Duan
- Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, School of Chemical Engineering and Technology; China University of Mining and Technology; Xuzhou 221116 China
| | - Yuemin Zhao
- Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, School of Chemical Engineering and Technology; China University of Mining and Technology; Xuzhou 221116 China
| | - Chenyang Zhou
- Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, School of Chemical Engineering and Technology; China University of Mining and Technology; Xuzhou 221116 China
| | - Yong Zhang
- Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, School of Chemical Engineering and Technology; China University of Mining and Technology; Xuzhou 221116 China
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25
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Yang J, He X, Guo R, Xu P, Wang K, Sheng C, Liu M, Wang J, Derevianko A, Zhan M. Coherence Preservation of a Single Neutral Atom Qubit Transferred between Magic-Intensity Optical Traps. Phys Rev Lett 2016; 117:123201. [PMID: 27689269 DOI: 10.1103/physrevlett.117.123201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Indexed: 06/06/2023]
Abstract
We demonstrate that the coherence of a single mobile atomic qubit can be well preserved during a transfer process among different optical dipole traps (ODTs). This is a prerequisite step in realizing a large-scale neutral atom quantum information processing platform. A qubit encoded in the hyperfine manifold of an ^{87}Rb atom is dynamically extracted from the static quantum register by an auxiliary moving ODT and reinserted into the static ODT. Previous experiments were limited by decoherences induced by the differential light shifts of qubit states. Here, we apply a magic-intensity trapping technique which mitigates the detrimental effects of light shifts and substantially enhances the coherence time to 225±21 ms. The experimentally demonstrated magic trapping technique relies on the previously neglected hyperpolarizability contribution to the light shifts, which makes the light shift dependence on the trapping laser intensity parabolic. Because of the parabolic dependence, at a certain "magic" intensity, the first order sensitivity to trapping light-intensity variations over ODT volume is eliminated. We experimentally demonstrate the utility of this approach and measure hyperpolarizability for the first time. Our results pave the way for constructing scalable quantum-computing architectures with single atoms trapped in an array of magic ODTs.
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Affiliation(s)
- Jiaheng Yang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaodong He
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Ruijun Guo
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Peng Xu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Kunpeng Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Cheng Sheng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
| | - Min Liu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Jin Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Andrei Derevianko
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
- Department of Physics, University of Nevada, Reno, Nevada 89557, USA
| | - Mingsheng Zhan
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
- Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
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26
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Zhong N, Xu B, Cui R, Xu M, Su J, Zhang Z, Liu Y, Li L, Sheng C, Sheng H, Qu S. Positive Correlation between Serum Osteocalcin and Testosterone in Male Hyperthyroidism Patients with High Bone Turnover. Exp Clin Endocrinol Diabetes 2016; 124:452-6. [PMID: 27219888 DOI: 10.1055/s-0042-107944] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 10/21/2022]
Affiliation(s)
- N. Zhong
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
| | - B. Xu
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
| | - R. Cui
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
| | - M. Xu
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
| | - J. Su
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
| | - Z. Zhang
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
| | - Y. Liu
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
| | - L. Li
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
| | - C. Sheng
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
| | - H. Sheng
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
| | - S. Qu
- Department of Endocrinology and Metabolism, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, China
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27
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Qian R, Bilige S, Dong JL, Zhuo SJ, Gu S, Sheng C, Wang Q. [Review on Analytical Methods of Doping Elements in Synthetic Crystals]. Guang Pu Xue Yu Guang Pu Fen Xi 2016; 36:1458-1463. [PMID: 30001031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
During the synthesis of crystal material, specific dopant can enhance the qualities and performance of crystals, while the types, concentrations and distributions of doping elements also have significant influence on the structures and properties of artificial crystals. Hence, it is very important to determine the concentrations of doping elements for further improving the crystal material formulas, crystal growth process, andits quality control. Currently, the analysis techniques for doping elements’ characterization include atomic spectrometry, X-ray fluorescence spectrometry, inorganic mass spectrometry, electron probe microanalysis, etc. The principles, advantages and disadvantages of these techniques are discussed in this paper. Considering the specialties and scope of application, it is necessary to choose the suitable methods to improve the efficiency and accuracy. Meanwhile, the developing trends of analysis methods for doping elements are also prospected.
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28
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Deng Y, Sheng C, Su YJ, Hairston MR, Knipp D, Huang CY, Ober D, Redmon RJ, Coley R. Correlation between Poynting flux and soft electron precipitation in the dayside polar cap boundary regions. J Geophys Res Space Phys 2015; 120:9102-9109. [PMID: 27812438 PMCID: PMC5066343 DOI: 10.1002/2015ja021075] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 09/21/2015] [Accepted: 09/22/2015] [Indexed: 05/31/2023]
Abstract
Observations have revealed large Poynting flux and soft electron precipitation around the cusp region, which have strong impacts on the polar ionosphere/thermosphere. Simulations also confirmed that Poynting flux and soft electron precipitation significantly change the neutral density and dynamics around the dayside polar cap boundary regions. However, no detailed study has been conducted to show if they should coincide with each other or not. Our analysis of Defense Meteorological Satellite Program (DMSP) satellite data reveals a complex correlation between them. Poynting flux and soft particle precipitation are coincident in some cases (match cases), but a clear displacement between them can also be identified in others (nonmatch cases). In the 29 cusp crossings from F13 we investigated, the ratio between nonmatch and match cases is close to 1:4. In nonmatch cases, the displacement between the Poynting flux enhancement and soft particle precipitation enhancement can be as large as 1° in geomagnetic latitude.
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Affiliation(s)
- Yue Deng
- Department of Physics University of Texas at Arlington Arlington Texas USA
| | - Cheng Sheng
- Department of Physics University of Texas at Arlington Arlington Texas USA
| | - Yi-Jiun Su
- Space Vehicles Directorate Air Force Research Laboratory Albuquerque New Mexico USA
| | - Marc R Hairston
- Department of Physics University of Texas at Dallas Richardson Texas USA
| | - Delores Knipp
- Aerospace Engineering Sciences University of Colorado Boulder Boulder Colorado USA
| | - Cheryl Y Huang
- Space Vehicles Directorate Air Force Research Laboratory Albuquerque New Mexico USA
| | - Daniel Ober
- Space Vehicles Directorate Air Force Research Laboratory Albuquerque New Mexico USA
| | - Rob J Redmon
- National Oceanic and Atmospheric Administration Boulder Colorado USA
| | - Robin Coley
- Department of Physics University of Texas at Dallas Richardson Texas USA
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29
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Zhang H, Sheng C, Yin Y, Wen S, Yang G, Cheng Z, Zhu Q. PABPC1 interacts with AGO2 and is responsible for the microRNA mediated gene silencing in high grade hepatocellular carcinoma. Cancer Lett 2015; 367:49-57. [PMID: 26188282 DOI: 10.1016/j.canlet.2015.07.010] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [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: 05/07/2015] [Revised: 07/03/2015] [Accepted: 07/10/2015] [Indexed: 12/14/2022]
Abstract
MicroRNAs (miRNA) have been considered as oncogenes, tumor suppressors, or modulators involved in the tumorigenesis and metastasis of hepatocellular carcinoma (HCC) today. As miRNA induces mRNA degradation or translation inhibition in RNA-induced silencing complex (RISC), the changes in RISC and its interacted proteins might contribute to the functional alternations of miRNA. To explore the molecular function of RISC in HCC, we co-purified RISC interacted proteins by anti-AGO2 antibody and identified 12 AGO2 binding proteins by mass spectrometry. Among them, we found PABPC1 was over-expressed in HCC, especially in high grade HCC. Further studies showed PABPC1 interacted with AGO2 in the cytoplasm of HCC cells. This interaction increased the recruitment of mRNA to RISC and enhanced the inhibition efficiency of miRNA. In general, PABPC1 acted as an oncogene in HCC as it induced cell proliferation by promoting entry into the S phase and enhanced the anchorage independent growth. Our study identified a novel method by which the activities of miRNA could be enhanced with the increase of PABPC1 in HCC and could explain why several miRNAs play critical roles in HCC progression without clear level changes. This finding would benefit the diagnosis and treatment of HCC.
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Affiliation(s)
- Hui Zhang
- School of Pharmaceutical Sciences, Central South University, Changsha 410013, Hunan, China
| | - Cheng Sheng
- The Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China
| | - Yongjia Yin
- The Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China
| | - Shu Wen
- Baylor College of Medicine, Houston, TX 77030, USA
| | - Guoping Yang
- School of Pharmaceutical Sciences, Central South University, Changsha 410013, Hunan, China
| | - Zeneng Cheng
- The Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China
| | - Qubo Zhu
- The Third Xiangya Hospital, Central South University, Changsha 410013, Hunan, China.
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30
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Sheng C, Zhao Y, Duan C, Zhang B, Feng P, Lv K, Yuan W, Zhang P, Zhou C. Establishment and Evaluation of a Dynamic Pressure Measuring and Analysis System for the Air Dense Medium Fluidized Bed. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.proeng.2015.01.290] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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31
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Li P, Sheng C, Huang L, Zhang H, Huang L, Cheng Z, Zhu Q. MiR-183/-96/-182 cluster is up-regulated in most breast cancers and increases cell proliferation and migration. Breast Cancer Res 2014; 16:473. [PMID: 25394902 PMCID: PMC4303194 DOI: 10.1186/s13058-014-0473-z] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 10/28/2014] [Indexed: 12/22/2022] Open
Abstract
Introduction The miR-183/-96/-182 cluster is a conserved polycistronic microRNA (miRNA) cluster which is highly expressed in most breast cancers. Although there are some sporadic reports which demonstrate the importance of each miRNA in this cluster in breast cancer, the biological roles of this cluster as a whole and its regulation mechanisms in breast cancer are still unclear. We compared the expression of this cluster in different cancer types, analyzed the regulation mechanism of this cluster, identified new target genes, and examined the impact of this cluster on breast cancer cells. Methods The miRNA level was detected by LNA-based northern blot and Real-time PCR, and was also analyzed from TCGA dataset. Bioinformatics research and luciferase assay were applied to find the promoter regions and transcription factors. To investigate the biological effects of the miR-183/-96 /-182 cluster in breast cancer, we generated miR-96, miR-182 and miR-183 overexpression stable cell lines to check the overdose effects; we also used miR-Down™ antagomir for each miRNA as well as miR-183/-96 /-182 cluster sponge lentivirus to check the knockdown effects. Growth, migration, cell cycle profile and survival of these cells was then monitored by colony formation assay, MTT assay, cell wound healing assay, flow cytometry and microscopy. The target gene was validated by Real-time PCR, luciferase assay, Western blot and Phalloidin/DAPI counterstaining. Results The miR-183/-96/-182 cluster was highly expressed in most breast cancers, and its transcription is disordered in breast cancer. The miR-183/-96/-182 cluster was transcribed in the same pri-miRNA and its transcription was regulated by ZEB1 and HSF2. It increased breast cell growth by promoting more rapid completion of mitosis, promoted cell migration and was essential for cell survival. MiR-183 targeted the RAB21 mRNA directly in breast cancer. Conclusion The miR-183/-96/-182 cluster is up-regulated in most breast cancer. It functions as an oncogene in breast cancer as it increases cell proliferation and migration. Electronic supplementary material The online version of this article (doi:10.1186/s13058-014-0473-z) contains supplementary material, which is available to authorized users.
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Gao F, Liu H, Sheng C, Zhu C, Zhu SN. Refractive index sensor based on the leaky radiation of a microfiber. Opt Express 2014; 22:12645-12652. [PMID: 24921381 DOI: 10.1364/oe.22.012645] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this work we present a refractive index sensor based on the leaky radiation of a microfiber. The 5.3um diameter microfiber is fabricated by drawing a commercial optical fiber. When the microfiber is immersed into a liquid with larger refractive index than the effective index of fiber mode, the light will leak out through the leaky radiation process. The variation of refractive index of liquid can be monitored by measuring radiation angle of light. The refractive index sensitivity can be over 400 degree/RIU in theory. In the experiment, the variation value 0.001 of refractive index of liquid around this microfiber can be detected through this technique. This work provides a simple and sensitive method for refractive index sensing application.
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Zhou T, Duan J, Hong D, Liu P, Sheng C, Huang Y. Characteristics of a single bubble in subcooled boiling region of a narrow rectangular channel under natural circulation. ANN NUCL ENERGY 2013. [DOI: 10.1016/j.anucene.2013.01.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wang Y, Sheng C, Liu H, Zheng YJ, Zhu C, Wang SM, Zhu SN. Transformation bending device emulated by graded-index waveguide. Opt Express 2012; 20:13006-13013. [PMID: 22714328 DOI: 10.1364/oe.20.013006] [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
We demonstrate that a transformation device can be emulated using a gradient-index waveguide. The effective index of the waveguide is spatially varied by tailoring a gradient thickness dielectric waveguide. Based on this technology, we demonstrate a transformation device guiding visible light around a sharp corner, with low scattering loss and reflection loss. The experimental results are in good agreement with the numerical results.
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Affiliation(s)
- Y Wang
- Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
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Sheng C, Chen Q, Norwood RA, Wang J, Thomas J, Peyghambarian N. Simple way for achieving passive all-optical switching of continuous waves lasers using pure nematic liquid crystal. Appl Opt 2011; 50:5788-5790. [PMID: 22015405 DOI: 10.1364/ao.50.005788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have examined pure nematic liquid crystal (LC), 4'-pentyl-4-biphenylcarbonitrile (5-CB), with a 90° twisted alignment within a cell made of two cross-polarized absorptive plastic polarizers, and investigated the nonlinear transmission properties using cw (532 nm) lasers. We observed optically self-activated polarization switching with a factor of three lower switching power than a dye-doped LC cell with similar linear transmittance using glass substrates. We also studied the dynamics of the switching processes and observed millisecond switching time. These studies have demonstrated a simpler but more efficient way for fabricating broadband, low switching power, millisecond time scale switching, and optical limiting devices.
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Affiliation(s)
- C Sheng
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
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Abstract
During the past two decades, the incidence of invasive fungal infections has been increasing dramatically. Clinical available antifungal agents have several drawbacks such as limited potency and spectrum, drug related toxicity, non-optimal pharmacokinetics, and severe resistance. There is an emergent need to develop new antifungal drugs with novel chemical structures and novel mechanism of action. This review will focus on the most significant achievements in the discovery of antifungal lead structures within last few years. In particular, we pay more attention on the structure-activity relationship of antifungal leads and provide perspectives for future antifungal drug discovery.
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Affiliation(s)
- C Sheng
- Department of Medicinal Chemistry, School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, PR China
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Sima GQ, Ling K, Sheng C. [Facial nerve injury caused by foreign bodies in parotid and deep part of the neck:a case report]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2011; 46:420. [PMID: 21781567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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38
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Li Z, Xu L, Peng C, Kuang H, Xu C, Wang L, Xue F, Ding T, Sheng C, Gong Y. Simultaneous Determination of Nine Types of Phthalate Residues in Commercial Milk Products Using HPLC-ESI-MS-MS. J Chromatogr Sci 2011; 49:338-43. [DOI: 10.1093/chrsci/49.4.337] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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39
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Yue L, Jiang Z, Wu W, Zhang Y, Yin P, Zhang Y, Sheng C, Wei G, Li X, Ling K. [Latent membrane protein-1 of EB virus and the phenotype of epithelial-mesenchymal transition and cervical lymph node metastasis in nasopharyngeal carcinoma]. Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2011; 25:270-273. [PMID: 21650062] [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: 05/30/2023]
Abstract
OBJECTIVE To evaluate the relation of EB virus latent membrane protein-1 (LMP-1) and the phenotype of epithelial-mesenchymal transition (EMT) and cervical lymph node metastasis in nasopharyngeal carcinoma. METHOD Based on histopathology and MRI imaging, nasopharyngeal biopsy tissues from 88 patients with nasopharyngeal carcinoma were divided into 3 groups: pathologic metastasis (18), MRI metastasis(40) and without metastasis (30). The expressions of LMP-1, STAT3, Twist, E-Cadherin and Vimentin were examined immunohistochemically in biopsy tissues. RESULT LMP-1 expression was found in 35 of 88 biopsy tissues with a positive rate of 38.7%. The positive rates of LMP-1 in groups of pathologic metastasis, MRI metastasis and without metastasis were 38.9% (7/18), 47.5% (19/40) and 30.0% (9/30), respectively, and significant difference were not found among three groups. The expression of LMP-1 was positively correlated to both expressions of Twist and Vimentin (r = 0.276 and 0.282, are P < 0.01), but not to both expressions of STAT3 and E-Cadherin. The positive expressions or abnormal expression of STAT3, Twist, Vimentin and E-Cadherin were found in 57 of 88 (64.8%), 48 of 88 (54.5%), 22 of 88 (20.0%)and 53 of 88 (60.2%), respectively. Significant differences in the expression of STAT3, Twist, Vimentin and E-Cadherin were all found among groups of pathologic metastasis, MRI metastasis and without metastasis, respectively (are P < 0.05). The expression of STAT3 was positively correlated to both expressions of Twist and Vimentin (r = 0.712 and 0.316, P < 0.01). CONCLUSION EMT plays important role in cervical lymph node metastasis in nasopharyngeal carcinoma. LMP-1 may be only as one of upstream factors associated with the EMT, but not the decisive factor for cervical lymph node metastasis.
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Affiliation(s)
- Lihua Yue
- Department of Otorhinolaryngology, the First Affiliated Hospital of Jiaxing College, Jiaxing, 314000, China.
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Ferreira M, Austerlitz C, Sheng C, Benhabib S, Allison R, Sibata C. SU-GG-T-304: Spreadsheet for Determination of Irradiance Delivered by Cylindrical Diffusers for Intracavitary PDT Treatments. Med Phys 2010. [DOI: 10.1118/1.3468699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Lee T, Wang W, O'Brien K, Sheng C, Wang T, Johnke R, Allison R. Post-exposure Radioprotection of American Ginseng on Lymphocytes: A Study of 40 Human Cases. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.1261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Sheng C, Bonnerup C, Austerlitz C, Allison R, Sibata C. WE-E-304A-04: Local Determination of Tissue Optical Properties: Reconstruction Based On Fiber-Array Reflectance Profiles. Med Phys 2009. [DOI: 10.1118/1.3182574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Ferreira M, Austerlitz C, Sheng C, Benhabib S, Allison R, Sibata C. MO-FF-A1-06: Quantitative Light Dosimetry in Air Using Spherical Optical Fiber Detector. Med Phys 2009. [DOI: 10.1118/1.3182282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Shan HZ, Zhuo SJ, Sheng C, Shen RX. [Mineralogical effect correction for pressed iron ore samples in wavelength dispersive X-ray fluorescence analysis]. Guang Pu Xue Yu Guang Pu Fen Xi 2008; 28:1661-1664. [PMID: 18844184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The possibility of correcting mineralogical effect for pressed powder pellets of iron ore samples was studied in wavelength dispersive X-ray fluorescence analysis of major and minor elements with 10 Chinese iron ore CRMs. Two methods were applied to reduce the influence of mineralogical effect. The first one is to check 20 angles for every sample before measurement to correct peak shift; another method is replacing peak intensity with peak area of the analytical line to correct the shape distortion of the spectrum. The K factors of the two methods for each element were compared to those from regular measurements. The results show that the calibration for most of the elements was improved, although to different degrees. The improvement in the calibration for sulfur is evident. The calibration for other elements can meet the general requirements except for total iron.
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Affiliation(s)
- Hua-Zhen Shan
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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Sheng C, Zhang W, Zhang M, Song Y, Ji H, Zhu J, Yao J, Yu J, Yang S, Zhou Y, Zhu J, Lu J. Homology Modeling of Lanosterol 14α-Demethylase ofCandida albicansandAspergillus fumigatusand Insights into the Enzyme-Substrate Interactions. J Biomol Struct Dyn 2004; 22:91-9. [PMID: 15214809 DOI: 10.1080/07391102.2004.10506984] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [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: 10/28/2022]
Abstract
The crystal structure of 14alpha-sterol demethylase from Mycobacterium tuberculosis (MT_14DM) provides a good template for modeling the three dimensional structure of lanosterol 14alpha-demethylase, which is the target of azole antifungal agents. Homologous 3D models of lanosterol 14alpha-demethylase from Candida albicans (CA_14DM) and Aspergillus fumigatus (AF_14DM) were built on the basis of the crystal coordinates of MT_14DM in complex with 4-phenylimidazole and fluconazole. The reliability of the two models was assessed by Ramachandran plots, Profile-3D analysis, and by analyzing the consistency of the two models with the experimental data on the P450(14DM). The overall structures of the resulting CA_14DM model and AF_14DM model are similar to those of the template structures. The two models remain the core structure characteristic for cytochrome P450s and most of the insertions and deletions expose the molecular surface. The structurally and functionally important residues such as the heme binding residues, the residues lining the substrate access channel, and residues in active site were identified from the model. To explore the binding mode of the substrate with the two models, 24(28)-methylene-24,25-dihydrolanosterol was docked into the active site of the two models and hydrophobic interaction and hydrogen-bonding were found to play an important role in substrate recognition and orientation. These results provided a basis for experiments to probe structure-function relationships in the P450(14DM). Although CA_14DM and AF_14DM shared similar core structural character, the active site of the two models were quite different, thus allowing the rational design of specific inhibitors to the target enzyme and the discovery of novel antifungal agents with broad spectrum.
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Affiliation(s)
- C Sheng
- School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, People's Republic of China
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Abstract
A method for the direct measurement of intracellular nitric oxide (NO) production stimulated by penicillin G (PG) in cultured hippocampal neurons with diaminoanthraquinone (DAA) using laser scanning confocal microscopy (LSCM) was developed. Intracellular DAA fluorescence could specifically represent NO production based on two facts: (1) 3-morpholinosydnonimine, a NO donor, could dose-dependently increase DAA fluorescence; and (2) haemoglobin, a NO scavenger, could inhibit the increase of DAA fluorescence. The PG dose-dependently increased the intercellular level of glutamate (Glu, 5 min after stimulation) and the intracellular NO production (30 min throughout stimulation). The increase of NO production could be reversed by N(w)-nitro- l -arginine (a NO synthase inhibitor), and also by d (-)2-amino-5-phosphonovaleric acid, a subtype of Glu receptor antagonist. These results revealed that DAA could be used to indicate real-time and kinetic intracellular NO production of hippocampal neurons with higher sensitivity, specificity and accuracy.
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Affiliation(s)
- X Chen
- Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, The People's Republic of China
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Thipse SS, Sheng C, Booty MR, Magee RS, Dreizin EL. Synthetic fuel for imitation of municipal solid waste in experimental studies of waste incineration. Chemosphere 2001; 44:1071-1077. [PMID: 11513393 DOI: 10.1016/s0045-6535(00)00470-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Synthetic fuel is prepared to imitate municipal solid waste (MSW) in experimental studies of incineration processes. The fuel is composed based on the Environmental Protection Agency reports on the materials contained in MSW. Uniform synthetic fuel pellets are prepared using available and inexpensive components including newsprint, hardwood mulch, low density polyethylene, iron, animal feed, sand, and water to imitate paperbound, wood, yard trimming, plastic, metal, food wastes, and other materials in MSW. The synthetic fuel preparation procedure enables one to reproduce and modify the fuel for a wide range of experiments in which the mechanisms of waste incineration are addressed. The fuel is characterized using standard ASTM tests and it is shown that its parameters, such as combustion enthalpy, density, as well as moisture, ash and fixed carbon contents are adequate for the representation of municipal solid waste. In addition, chlorine, nitrogen, and sulfur contents of the fuel are shown to be similar to those of MSW. Experiments are conducted in which the synthetic fuel is used for operation of a pilot-scale incinerator research facility. Steady-state temperature operation regimes are achieved and reproduced in these experiments. Thermodynamic equilibrium flame conditions are computed using an isentropic one-dimensional equilibrium code for a wide range of fuel/air ratios. The molecular species used to represent the fuel composition included cellulose, water, iron, polyethylene, methanamine, and silica. The predicted concentrations of carbon monoxide, nitric oxides, and oxygen in the combustion products are compared with the respective experimental concentrations in the pilot-scale incinerator exhaust.
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Affiliation(s)
- S S Thipse
- Department of Mechanical Engineering, New Jersey Institute of Technology, Newark 07102-1982, USA
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Abstract
A quantitative theory of plate number N in capillary electrophoresis was developed for buffers containing neutral cyclodextrins (CDs) capable of forming inclusion complexes. In the theory, N was modeled by longitudinal diffusion, injection extent, width of the detection window, and the detector time constant. The apparent mobility was modeled as a weighted sum of the mobilities of the free-solution analyte and the inclusion complex. The apparent diffusion coefficient was modeled as a similarly weighted sum. Both the apparent mobility and diffusion coefficient were corrected by functions that compensated for increases of buffer temperature caused by Joule heat. The experimental N's and apparent mobilities of neutral thiourea and of the anions, dansyl D- and L-leucine, dansyl D- and L-aspartic acid, benzoate, and 4-nitrophenolate, were determined in buffers containing from 0 to 15 mM beta-CD. The binding constants, and mobilities and diffusion coefficients of the free-solution analyte and inclusion complex, were calculated as regression coefficients by fitting theory to these determinations. The regression coefficients were shown to have physicochemical meaning, as assessed by literature values, independent measurements, and theoretical predictions. The assessment showed the Nernst-Einstein equation does not relate mobilities and diffusion coefficients at the electrolyte concentration used. The interdependence of mobilities, diffusion coefficients, binding constants, and other dispersion sources was interpreted to evaluate the factors affecting the variation of N with CD concentration. From the interpretation, an approximate equation for N in low-concentration CD buffers was derived. The equation depends on free-solution and inclusion-complex mobilities and diffusion coefficients, the binding constant, the potential difference over the effective capillary length, and the number of plates in a CD-free buffer.
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Affiliation(s)
- T H Seals
- Department of Chemistry and Biochemistry, Southern Illinois University at Carbondale, 62901-4409, USA
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