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Zhou BW, Zhang J, Ye XB, Liu GX, Xu X, Wang J, Liu ZH, Zhou L, Liao ZY, Yao HB, Xu S, Shi JJ, Shen X, Yu XH, Hu ZW, Lin HJ, Chen CT, Qiu XG, Dong C, Zhang JX, Yu RC, Yu P, Jin KJ, Meng QB, Long YW. Octahedral Distortion and Displacement-Type Ferroelectricity with Switchable Photovoltaic Effect in a 3d^{3}-Electron Perovskite System. Phys Rev Lett 2023; 130:146101. [PMID: 37084444 DOI: 10.1103/physrevlett.130.146101] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 12/02/2022] [Accepted: 03/14/2023] [Indexed: 05/03/2023]
Abstract
Because of the half-filled t_{2g}-electron configuration, the BO_{6} octahedral distortion in a 3d^{3} perovskite system is usually very limited. In this Letter, a perovskitelike oxide Hg_{0.75}Pb_{0.25}MnO_{3} (HPMO) with a 3d^{3} Mn^{4+} state was synthesized by using high pressure and high temperature methods. This compound exhibits an unusually large octahedral distortion enhanced by approximately 2 orders of magnitude compared with that observed in other 3d^{3} perovskite systems like RCr^{3+}O_{3} (R=rare earth). Essentially different from centrosymmetric HgMnO_{3} and PbMnO_{3}, the A-site doped HPMO presents a polar crystal structure with the space group Ama2 and a substantial spontaneous electric polarization (26.5 μC/cm^{2} in theory) arising from the off-center displacements of A- and B-site ions. More interestingly, a prominent net photocurrent and switchable photovoltaic effect with a sustainable photoresponse were observed in the current polycrystalline HPMO. This Letter provides an exceptional d^{3} material system which shows unusually large octahedral distortion and displacement-type ferroelectricity violating the "d^{0}-ness" rule.
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Affiliation(s)
- B W Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - J Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - X B Ye
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - G X Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - X Xu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - J Wang
- Department of Physics, Beijing Normal University, Beijing 100875, China
| | - Z H Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - L Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Z Y Liao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - H B Yao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - S Xu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - J J Shi
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - X Shen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - X H Yu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Z W Hu
- Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - H J Lin
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C T Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - X G Qiu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - C Dong
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - J X Zhang
- Department of Physics, Beijing Normal University, Beijing 100875, China
| | - R C Yu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - P Yu
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China
| | - K J Jin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Q B Meng
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Y W Long
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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Yao HB, Zhang RC, Hu JF, Zhao ZK, Shao QS. [Diagnosis and treatment of gastric cancer with immediate double primary carcinoma]. Zhonghua Yi Xue Za Zhi 2020; 100:3001-3004. [PMID: 33086451 DOI: 10.3760/cma.j.cn112137-20200210-00234] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the clinical characteristics, treatment and prognosis of gastric cancer complicated with immediate double primary cancer. Methods: The clinical data of patients who met the diagnostic criteria of gastric cancer with immediate double primary cancer from January 2016 to June 2019 were analyzed retrospectively. Results: There were 29 cases of gastric cancer with immediate double primary carcinoma, accounting for 1.7% of the 1 741 patients with gastric cancer in the same period. Of these, 17 (58.6%) were more than 70 years of age. 25 cases (86.2%) were male. The postoperative pathological staging was mainly for early gastric cancer (63.2%). Colorectal cancer accounted for 8 cases (27.6%), followed by esophageal cancer in 7 cases (24.1%). The others included 6 cases of lung cancer (20.7%), 2 cases of pancreatic cancer (6.9%), 2 cases of prostate cancer (6.9%), 1 case of non-Hodgkin's lymphoma (3.4%), 1 case of ampullary tumor (3.4%), 1 case of bile duct carcinoma (3.4%) and 1 case of laryngeal carcinoma (3.4%). The prognosis of the surgical treatment group was significantly better than that of the non-surgical treatment group (median survival time: 21.0 months vs 13.0 months, P=0.014). Conclusion: Gastric cancer complicated with immediate double primary cancer mostly occurs in elderly men and early gastric cancer patients. In the complicated tumor, colorectal cancer is the main cause, so we should pay attention to the screening of digestive system. Radical surgery should be performed as far as possible for each primary tumor.
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Affiliation(s)
- H B Yao
- Department of Gastrointestinal and Pancreatic Surgery, Zhejiang Provincial People's Hospital; People's Hospital of Hangzhou Medical College, Hangzhou 310014, China
| | - R C Zhang
- Department of Gastrointestinal and Pancreatic Surgery, Zhejiang Provincial People's Hospital; People's Hospital of Hangzhou Medical College, Hangzhou 310014, China
| | - J F Hu
- Department of Gastrointestinal and Pancreatic Surgery, Zhejiang Provincial People's Hospital; People's Hospital of Hangzhou Medical College, Hangzhou 310014, China
| | - Z K Zhao
- Department of Gastrointestinal and Pancreatic Surgery, Zhejiang Provincial People's Hospital; People's Hospital of Hangzhou Medical College, Hangzhou 310014, China
| | - Q S Shao
- Department of Gastrointestinal and Pancreatic Surgery, Zhejiang Provincial People's Hospital; People's Hospital of Hangzhou Medical College, Hangzhou 310014, China
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Shi YK, Mou YP, Wang YY, Qian ZY, Jin WW, Yao HB, Zhao ZK, Xu XD, Shao QS. [Surgical treatment of port-site metastases after laparoscopic radical resection of gastric cancer]. Zhonghua Yi Xue Za Zhi 2019; 99:2497-2500. [PMID: 31484275 DOI: 10.3760/cma.j.issn.0376-2491.2019.32.004] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the feasibility of surgical treatment of port-site metastasis after laparoscopic radical resection of gastric cancer. Methods: The clinical and follow-up data of five patients with port-site metastases after laparoscopic radical resection of gastric cancer at Zhejiang Provincial People's Hospital between January 2014 and January 2018 were retrospectively analyzed. Results: Port-site metastases occurred within 6 months after gastrointestinal tumor resection in three patients, 10 months after the operation in one patient, and 30 months after the operation in one patient, respectively. Metastasis to the abdominal cavity or distant metastasis was excluded before the surgical treatment of the port-site metastases, and all patients recovered well after the operation. No incisional infection or hernia occurred. By December 2018, two patients died (they survived for 13 and 24 months, respectively) and three patients survived. The follow-up duration ranged from 7 to 19 months. Conclusions: Surgical resection of port-site metastases is not difficult due to their superficial location. Surgical treatment can improve the prognosis of patients without abdominal or distant metastasis/recurrence.
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Affiliation(s)
- Y K Shi
- Department of Gastrointestinal and Pancreatic Surgery, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, and Key Laboratory of Gastroenterology of Zhejiang Province, Hangzhou 310014, China
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Hu SJ, Wei P, Kou W, Wu XF, Liu MY, Chen C, Yao HB. [Prevalence and risk factors of allergic rhinitis: a Meta-analysis]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 31:1485-1491. [PMID: 29798100 DOI: 10.13201/j.issn.1001-1781.2017.19.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Indexed: 11/12/2022]
Abstract
Objective:To clarify the morbidity and risk factors of allergic rhinitis (AR) in China so as to provide scientific basis for prevention of AR in the relevant populations.Method:Pubmed,Embase,Web of science,Cochrane Library,CNKI,VIP,Wanfang Data,CBM databases were searched for associated studies. The prevalence and risk factors of AR in China were retrieved from individual studies and the pooled estimates generated by R3.2.3 software.Result:Thirty-one cross-sectional studies were included in the Meta-analysis. The results indicated that the incidences of AR in Chinese children were 15.79%(95%CI 15.13-16.45).The highest prevalence is 17.20% in central China,the lowest is 13.94% in eastern China. The incidences of AR in Chinese adult were 13.26% (95%CI 12.05-14.47).The highest prevalence is 15.45% in southern China,the lowest is 10.93% in southwestern China. The pooled odds ratio (OR) values of family history (5.40),dust exposure history (2.04),drug allergy history (2.83),history of asthma(4.45),environmental tobacco smoking(ETS)(2.00),water damage (1.50),upholstering(1.41),pollen allergy(17.18),molds(1.31),keeping pets (1.29),cockroach (1.69).Conclusion:A study on the epidemic tendency of AR in China showed the morbidity of AR in Chinese children is higher than adult. Moreover,prevalence vary from region to region. Eleven kinds of risk factors mentioned above play imperative roles in the pathogenesis of AR. The early interventions which are associated with risk factors should be implemented in AR.
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Affiliation(s)
- S J Hu
- Department of Otorhinolaryngology Head and Neck Surgery,Children's Hospital of Chongqing Medical University,Chongqing,400014,China
| | - P Wei
- Department of Otorhinolaryngology Head and Neck Surgery,Children's Hospital of Chongqing Medical University,Chongqing,400014,China
| | - W Kou
- Department of Otorhinolaryngology Head and Neck Surgery,Children's Hospital of Chongqing Medical University,Chongqing,400014,China
| | - X F Wu
- Department of Otorhinolaryngology Head and Neck Surgery,Children's Hospital of Chongqing Medical University,Chongqing,400014,China
| | - M Y Liu
- Department of Otorhinolaryngology Head and Neck Surgery,Children's Hospital of Chongqing Medical University,Chongqing,400014,China
| | - C Chen
- Department of Otorhinolaryngology Head and Neck Surgery,Children's Hospital of Chongqing Medical University,Chongqing,400014,China
| | - H B Yao
- Department of Otorhinolaryngology Head and Neck Surgery,Children's Hospital of Chongqing Medical University,Chongqing,400014,China
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Wei P, Kou W, Yao HB. [Meta-analysis of the morbidity of asthma in children with allergic rhinitis]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 30:698-701. [PMID: 29771016 DOI: 10.13201/j.issn.1001-1781.2016.09.007] [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] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Indexed: 11/12/2022]
Abstract
Objective: Pathogenesis of allergic rhinitis(AR) is thought to be related with asthma in children. However, lager scaled reports concerned on the co-morbidity of this two diseases in children are rare. In this meta-analysis, we aim to clarify the morbidity of asthma in children with AR.Method:Pubmed, Science, Springer, Elsevier, Embase, BMJ Journals, Wanfang data, VIP, CBM and CNKI were searched for relevant studies.The prevalences of asthma in children with AR were retrieved from individual studies and the pooled estimates generated by R3.2.3.Result:Fifteen cross-sectional studies were included in the meta-analysis. The results showed that the incidences of asthma in AR children were 35.01%(95%CI32.32%-37.70%) in China and 31.59%(95%CI28.02%-35.16%) in foreign countries.Conclusion:Comorbidity of AR and asthma was high in children. The incidence of asthma is higher in children with AR in China than that in foreign countries.
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Affiliation(s)
- P Wei
- Department of Otolaryngology-Head and Neck Surgery, Children's Hospital of Chongqing Medical University, Chongqing, 400014, China
| | - W Kou
- Department of Otolaryngology-Head and Neck Surgery, Children's Hospital of Chongqing Medical University, Chongqing, 400014, China
| | - H B Yao
- Department of Otolaryngology-Head and Neck Surgery, Children's Hospital of Chongqing Medical University, Chongqing, 400014, China
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Yao HB, Lu JF. [Long-term clinical effect and safety observation of sublingual dermatophagoides farinae drop in preschool and school-age children with allergic rhinitis]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 31:377-381. [PMID: 29871266 DOI: 10.13201/j.issn.1001-1781.2017.05.012] [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] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Indexed: 11/12/2022]
Abstract
Objective:To evaluate the efficacy of specific sublingual immunotherapy (SLIT) with Dermatophagoides farinae drops on preschool and school age children with allergic rhinitis.Method:Fifty preschool children (≤6 year), and 52 school age children (> 6 year), who suffered from dust mite induced allergic rhinitis, were randomly divided into subingual immunotherapy (SLIT) + drug group and drug group. SLIT + drug group was treated with a standardized subingual immunotherapy drops of Dermatophagoides farinae and combined with symptomatic therapy, drug group was treated with mometasone furoate nasal spray and dseloratdine tablets as symptomatic treatment. These children were followed up for 2 years with one visit in every 3 months. Symptom scores and medication scores were record at each visit. Comprehensive evaluation of symptom, medication, and patients' degree of satisfaction were used.Result:Two years after SLIT finished, symptom scores (SLIT + drug group: 1.13±1.05; drug group: 4.68±3.09), medication scores (SLIT + drug group: 0.07±0.04; drug group: 0.36±0.25) of SLIT+drug group were significantly lower than those in drug group respectively, all P< 0.01. The subjective assessment of patient' symptom, medication, and treatment satisfaction in SLIT+drug group was significantly lower than those in drug group. Subjective assessment symptoms, medication, and treatment satisfaction in preschool group was the same as in school age group. After SLIT ended for 2 years, subjective assessment and treatment satisfaction in the school age group was better than those in preschool group in medication score.Conclusion:SLIT demonstrated clinical improvement in children of different ages during 2 years treatment. the symptom scores, medication scores and subjective satisfaction in school age group are better than those in preschool group.
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Affiliation(s)
- H B Yao
- Department of Otolaryngology, the First Hospital of Chunan, Chunan, 311700, China
| | - J F Lu
- Department of Otolaryngology, the First Hospital of Chunan, Chunan, 311700, China
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Yao HB, Xu Y, Chen LG, Guan TP, Ma YY, He XJ, Xia YJ, Tao HQ, Shao QS. AKR1B10, a good prognostic indicator in gastric cancer. Eur J Surg Oncol 2013; 40:318-24. [PMID: 24406159 DOI: 10.1016/j.ejso.2013.12.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2013] [Revised: 12/15/2013] [Accepted: 12/16/2013] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND AND OBJECTIVES The aim of the study was to investigate the correlation between AKR1B10 expression and clinicopathological features of gastric cancer (GC). METHODS Real-time polymerase chain reaction (RT-PCR) was performed to determine AKR1B10 mRNA expression. AKR1B10 protein levels were measured by immunohistochemistry. RESULTS RT-PCR analysis confirmed that AKR1B10 was significantly down-regulated in gastric cancer compared with paired, normal mucosa. Immunohistochemistry revealed that the percentage of AKR1B10-positive specimens was lower in gastric carcinoma compared with normal specimens. The frequency of AKR1B10-positive GC specimens was higher in patients with tumor size <5 cm, no lymph node metastasis, no distant metastasis and lower tumor stages The mean survival time for patients in the AKR1B10-positive group was significantly higher compared with the AKR1B1-negative group. The 5-year survival rate for the AKR1B10-positive group was also significantly higher than for the AKR1B1-negative group. Cox regression analysis revealed that AKR1B10 expression is an independent prognostic factor of GC. CONCLUSIONS Expression of AKR1B10 in gastric cancer was significantly associated with tumor size, lymph node metastasis, distance metastasis and TNM stage, and AKR1B10 may be a good prognostic indicator in gastric cancer.
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Affiliation(s)
- H B Yao
- Department of Gastrointestinal Surgery, Zhejiang Provincial People's Hospital, Hangzhou 310014, Zhejiang, China
| | - Y Xu
- Department of Gastrointestinal Surgery, Zhejiang Provincial People's Hospital, Hangzhou 310014, Zhejiang, China
| | - L G Chen
- Department of Gastrointestinal Surgery, Zhejiang Provincial People's Hospital, Hangzhou 310014, Zhejiang, China
| | - T P Guan
- Department of Gastrointestinal Surgery, Zhejiang Provincial People's Hospital, Hangzhou 310014, Zhejiang, China
| | - Y Y Ma
- Key Laboratory of Gastroenterology of Zhejiang Province, Hangzhou 310014, Zhejiang, China
| | - X J He
- Key Laboratory of Gastroenterology of Zhejiang Province, Hangzhou 310014, Zhejiang, China
| | - Y J Xia
- Key Laboratory of Gastroenterology of Zhejiang Province, Hangzhou 310014, Zhejiang, China
| | - H-Q Tao
- Key Laboratory of Gastroenterology of Zhejiang Province, Hangzhou 310014, Zhejiang, China
| | - Q S Shao
- Department of Gastrointestinal Surgery, Zhejiang Provincial People's Hospital, Hangzhou 310014, Zhejiang, China.
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Yao HB, Han GJ, Liu GX, Xie Y, Wang CH. Determination of Imazaquin and its metabolite by liquid chromatography-quadrupole-time of flight tandem mass. Bull Environ Contam Toxicol 2010; 85:142-146. [PMID: 20652226 DOI: 10.1007/s00128-010-0076-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2010] [Accepted: 07/08/2010] [Indexed: 05/29/2023]
Abstract
A method consisting of solvent extraction followed by liquid chromatography-quadrupole-time of flight- tandem mass spectrometry analysis was developed for the identification of Imazaquin and its metabolite. The relationships between detector response and sample concentrations showed a high degree of linearity (r > 0.998) over the range 0.03-10 microg/g. The recoveries obtained were in the acceptable range of 86%-104% between spiked. The relative standard deviation of this method was 6.4%-17.1%. A 35-day study of Imazaquin degradation was taken in agricultural soil from Binzhou, China. The degradation followed first order kinetics (C = 0.7672e(-0.0774t)), with half-life of less than 8.5 days. Investigation of the by-products from liquid chromatography-quadrupole-time of flight- tandem mass spectrometry has shown that there were four important metabolites 4-methylene-2-(quinolin-2-yl)-1H-imidazol-5(4H)-one, quinoline-3-carbaldehyde, 1-amino-2,3-dimethyl-1-oxobutan-2-ylium and 1H-[1,2]oxazino[4,5-b]quinolin-1-one in the degradation process. The accurate mass measurements error was 5 ppm in this study. The method was successfully applied to the analysis of imazaquin and its metabolite residues in soil.
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Affiliation(s)
- H B Yao
- Department of Chemistry and Chemical Engineering, Binzhou University, Binzhou, Shandong, China.
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Back BB, Betts RR, Chang J, Chang WC, Chi CY, Chu YY, Cumming JB, Dunlop JC, Eldredge W, Fung SY, Ganz R, Garcia E, Gillitzer A, Heintzelman G, Henning WF, Hofman DJ, Holzman B, Kang JH, Kim EJ, Kim SY, Kwon Y, McLeod D, Mignerey AC, Moulson M, Nanal V, Ogilvie CA, Pak R, Ruangma A, Russ DE, Seto R, Stanskas PJ, Stephans GS, Wang H, Wolfs FL, Wuosmaa AH, Xiang H, Xu GH, Yao HB, Zou CM. Antilambda production in Au+Au collisions at 11.7A GeV/c. Phys Rev Lett 2001; 87:242301. [PMID: 11736497 DOI: 10.1103/physrevlett.87.242301] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2001] [Indexed: 05/23/2023]
Abstract
We present results for antilambda and antiproton production in Au+Au collisions at 11.7 A GeV/c including spectra and extracted invariant yields for both species in central and peripheral collisions in the rapidity range 1.0<y<1.4. The antilambda yield increases from dN(Lambda;)/dy = 1.2(+0.7+0.2)(-0.6-0.2)x10(-3) in peripheral collisions to 19(+4+3)(-5-2)x10(-3) in central collisions. The direct antiproton yield is deduced from the measured total antiproton spectra to extract the ratio of antilambda-to-direct-antiproton production. The Lambda/p ratio near midrapidity increases from 0.26(+0.19+0.5)(-0.15-0.4) in peripheral collisions to 3.6(+4.7+2.7)(-1.8-1.1) in central collisions, a value larger than current theoretical estimates.
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Affiliation(s)
- B B Back
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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Back BB, Betts RR, Chang J, Chang WC, Chi CY, Chu YY, Cumming JB, Dunlop JC, Eldredge W, Fung SY, Ganz R, Garcia E, Gillitzer A, Heintzelman G, Henning WF, Hofman DJ, Holzman B, Kang JH, Kim EJ, Kim SY, Kwon Y, McLeod D, Mignerey AC, Moulson M, Nanal V, Ogilvie CA, Pak R, Ruangma A, Russ DE, Seto RK, Stanskas PJ, Stephans GS, Wang HQ, Wolfs FL, Wuosmaa AH, Xiang H, Xu GH, Yao HB, Zou CM. Baryon rapidity loss in relativistic Au + Au collisions. Phys Rev Lett 2001; 86:1970-1973. [PMID: 11289832 DOI: 10.1103/physrevlett.86.1970] [Citation(s) in RCA: 6] [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: 03/17/2000] [Indexed: 05/23/2023]
Abstract
An excitation function of proton rapidity distributions for different centralities is reported from AGS Experiment E917 for Au+Au collisions at 6, 8, and 10.8 GeV/nucleon. The rapidity distributions from peripheral collisions have a valley at midrapidity which smoothly change to distributions that display a broad peak at midrapidity for central collisions. The mean rapidity loss increases with increasing beam energy, whereas the fraction of protons consistent with isotropic emission from a stationary source at midrapidity decreases with increasing beam energy. The data suggest that the stopping is substantially less than complete at these energies.
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Affiliation(s)
- B B Back
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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Shaw PC, Mulot S, Ma SK, Xu QF, Yao HB, Wu S, Lu XH, Dong YC. Structure/function relationship study of Tyr14 and Arg22 in trichosanthin, a ribosome-inactivating protein. Eur J Biochem 1997; 245:423-7. [PMID: 9151974 DOI: 10.1111/j.1432-1033.1997.00423.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Amino acids Tyr14 and Arg22 in trichosanthin are residues on helix A1 close to the active-site cleft. They are invariant in various type-I and type-II ribosome-inactivating proteins. In this study, Tyr14 was changed to Phe and Arg22 to Lys and Leu. Modified proteins were purified, and activities compared by assaying their median inhibitory concentration (ID50) on a rabbit-reticulocyte-lysate protein-synthesis system. While the ID50 of wild-type trichosanthin was 0.02 nM, those for [Phe14], [Lys22], [Leu22] and [Phe14, Leu22]trichosanthin were 0.10, 0.03, 0.25 and 0.15 nM, respectively. Therefore, compared with Tyr14, Arg22 appears to play a more important role in trichosanthin. Structural studies on [Leu22]trichosanthin showed that two water molecules occupy the space left by the side chain of Arg22, and hydrogen bonds exist between these water molecules and nearby residues to retain the conformation. The use of intermolecular rather than intramolecular hydrogen bonds may have an adverse effect on stability or folding of the protein and results in a mild decrease in activity.
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Affiliation(s)
- P C Shaw
- Department of Biochemistry, The Chinese University of Hong Kong, Shatin
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