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Chao YS, Yang YW, Sheue CR, Lai IL. Niche and phenotypic differentiation in fern hybrid speciation, a case study of Pteris fauriei (Pteridaceae). Ann Bot 2024:mcae037. [PMID: 38470192 DOI: 10.1093/aob/mcae037] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Indexed: 03/13/2024]
Abstract
BACKGROUND AND AIMS Niche differentiation is a critical issue in speciation. Although it has a well-known role in adaptive processes of hybrid angiosperms, it is less understood in hybrid ferns. Here we investigate whether an intermediate ecological niche of a fern hybrid is a novel adaptation that provides insights into fern hybrid speciation. METHODS Pteris fauriei (Pteridaceae) is a natural hybrid fern, occurring environments between its parent species. The maternal P. minor is found in sunny areas, but the habitat of the paternal P. latipinna is shady. We combined data from morphology, leaf anatomy, and photosynthetic traits to explore adaptation and differentiation, along with measuring the environmental features of their niches. We also performed experiments in a common garden to understand ecological plasticity. KEY RESULTS The hybrid P. fauriei is intermediate between the parent species in stomatal density, leaf anatomical features, and photosynthetic characteristics in both natural habitats and a common garden. Interestingly, the maternal P. minor showed significant environmental plasticity and was more similar to the hybrid P. fauriei in the common garden, suggesting that the maternal species experiences stress in its natural habitats but thrives in the environments similar to the hybrid's. CONCLUSIONS Based on the similar niche preferences of the hybrid and parents, we propose hybrid superiority. Our results indicate that the hybrid P. fauriei exhibits greater fitness and can compete with and occupy the initial niches of the maternal P. minor. Consequently, we suggest that the maternal P. minor has experienced a niche shift, elucidating the pattern of niche differentiation in this hybrid group. These findings offer a potential explanation for the frequent occurrence of hybridization in ferns and provide novel insights into fern hybrid speciation, enhancing our understanding of fern diversity.
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Affiliation(s)
- Yi-Shan Chao
- Department Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | - Yao-Wei Yang
- Department of Life Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Chiou-Rong Sheue
- Department of Life Sciences, National Chung Hsing University, Taichung, Taiwan
- Research Center for Global Change Biology, National Chung Hsing University, Taichung, Taiwan
| | - I-Ling Lai
- Graduate Institute of Bioresources, National Pingtung University of Science and Technology, Pingtung, Taiwan
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Yang YW, Zhou ZY, Fu Y. [Head neck rhabdomyosarcoma in identical twins: a report of two cases]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2024; 59:263-265. [PMID: 38561268 DOI: 10.3760/cma.j.cn115330-20230827-00063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Affiliation(s)
- Y W Yang
- Department of Otorhinolaryngology, the Children's Hospital of Zhejiang University School of Medicine, Hangzhou 310052, China
| | - Z Y Zhou
- Department of Otorhinolaryngology, the Children's Hospital of Zhejiang University School of Medicine, Hangzhou 310052, China
| | - Y Fu
- Department of Otorhinolaryngology, the Children's Hospital of Zhejiang University School of Medicine, Hangzhou 310052, China
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Zhang HJ, Lu YF, Wang Q, Yang YW, Li YP, Wu YY, Ding C, Chang JR, Zhu Y, Xu DQ. [Study on formulation and revision of detection methods of "Standards for indoor air quality (GB/T 18883-2022)" in China]. Zhonghua Yu Fang Yi Xue Za Zhi 2023; 57:1777-1781. [PMID: 38008565 DOI: 10.3760/cma.j.cn112150-20230330-00244] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/28/2023]
Abstract
The formulation and revision of the detection methods of indoor air quality standards is an important, rigorous and delicate endeavor. This paper introduced the formulation and revision of the detection methods of the standards for indoor air quality (GB/T 18883-2022), focusing on the revision process, revision principles, main adjustments and technical points of some key indicators to facilitate users to better understand and apply the detection methods in standards for indoor air quality (GB/T 18883-2022).
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Affiliation(s)
- H J Zhang
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - Y F Lu
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - Q Wang
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - Y W Yang
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - Y P Li
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - Y Y Wu
- China CDC Key Laboratory of Radiological Protection and Nuclear Emergency/National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China
| | - C Ding
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - J R Chang
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - Y Zhu
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
| | - D Q Xu
- China CDC Key Laboratory of Environment and Population Health/National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
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Wu BT, An N, Yang YW, Huang ZZ, Feng JF. [Further understanding and paying attention to normoalbuminuric diabetic kidney disease]. Zhonghua Yu Fang Yi Xue Za Zhi 2023; 57:1663-1673. [PMID: 37859387 DOI: 10.3760/cma.j.cn112150-20230404-00256] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
Diabetes mellitus (DM) has grown up to be an important issue of global public health because of its high incidence rate. Diabetic kidney disease (DKD) is the main cause of end-stage kidney disease (ESKD). Therefore, early diagnosis and timely prevention and treatment of DKD are essential for the progress of DM. The clinical diagnosis and staging of DKD are mostly based on the urinary albumin excretion rate (UAER) and estimated glomerular filtration rate (eGFR). However, clinically, DKD patients show normoalbuminuric diabetic kidney disease (NADKD) instead of clinical proteinuria. The old NADKD concept is no longer suitable and should be updated accordingly with the redefinition of normal proteinuria by NKF/FDA (National Kidney Foundation/Food and Drug Administration). Based on the relevant guidelines of DM and chronic kidney disease (CKD) and combined with the current situation of clinical research, the review described NADKD from the aspects of epidemiology, pathological mechanism, disease diagnosis, clinical characteristics and biomarkers, to arouse the new understanding of NADKD in the medical profession and pay attention to it.
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Affiliation(s)
- B T Wu
- Department of Clinical Laboratory, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang 621000, China
| | - N An
- Department of Clinical Laboratory, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang 621000, China
| | - Y W Yang
- Department of Clinical Laboratory, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang 621000, China
| | - Z Z Huang
- Department of Clinical Laboratory, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang 621000, China
| | - J F Feng
- Department of Clinical Laboratory, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang 621000, China
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Tan XH, Deng AP, Zhang YT, Luo M, Deng H, Yang YW, Duan JH, Peng ZQ, Zhang M. [Analysis of the impact of health management measures for entry personnel on imported Dengue fever in Guangdong Province, 2020-2022]. Zhonghua Liu Xing Bing Xue Za Zhi 2023; 44:954-959. [PMID: 37380419 DOI: 10.3760/cma.j.cn112338-20221021-00899] [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] [Subscribe] [Scholar Register] [Indexed: 06/30/2023]
Abstract
Objective: To explore the impact of health management measures for entry personnel (entry management measures) against COVID-19 on the epidemiological characteristics of imported Dengue fever in Guangdong Province from 2020 to 2022. Methods: Data of imported Dengue fever from January 1, 2016 to August 31, 2022, mosquito density surveillance from 2016 to 2021, and international airline passengers and Dengue fever annual reported cases from 2011 to 2021 in Guangdong were collected. Comparative analysis was conducted to explore changes in the epidemic characteristics of imported Dengue fever before the implementation of entry management measures (from January 1, 2016 to March 20, 2020) and after the implementation (from March 21, 2020 to August 31, 2022). Results: From March 21, 2020, to August 31, 2022, a total of 52 cases of imported Dengue fever cases were reported, with an imported risk intensity of 0.12, which were lower than those before implementation of entry management measures (1 828, 5.29). No significant differences were found in the characteristics of imported cases before and after implementation of entry management measures, including seasonality, sex, age, career, and imported countries (all P>0.05). 59.62% (31/52) of cases were found at the centralized isolation sites and 38.46% (20/52) at the entry ports. However, before implementation of entry management measures, 95.08% (1 738/1 828) of cases were found in hospitals. Among 51 cases who had provided entry dates, 82.35% (42/51) and 98.04% (50/51) of cases were found within seven days and fourteen days after entry, slightly higher than before implementation [(72.69%(362/498) and 97.59% (486/498)]. There was significant difference between the monthly mean values of Aedes mosquito larval density (Bretto index) from 2020 to 2021 and those from 2016 to 2019 (Z=2.83, P=0.005). There is a strong positive correlation between the annual international airline passengers volume in Guangdong from 2011 to 2021 and the annual imported Dengue fever cases (r=0.94, P<0.001), and a positive correlation also existed between the international passenger volume and the annual indigenous Dengue fever cases (r=0.72, P=0.013). Conclusions: In Guangdong, the entry management measures of centralized isolation for fourteen days after entry from abroad had been implemented, and most imported Dengue fever cases were found within fourteen days after entry. The risk of local transmission caused by imported cases has reduced significantly.
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Affiliation(s)
- X H Tan
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - A P Deng
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Y T Zhang
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - M Luo
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - H Deng
- Institute of Disinfection and Vector Control, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Y W Yang
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - J H Duan
- Institute of Disinfection and Vector Control, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Z Q Peng
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - M Zhang
- Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
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Wang SJ, Zhang ZQ, Sun Y, Song CL, Yang YW, Wei JH, Wu W. [Endoscopic assisted treatment of Langerhans cell histiocytosis of lingual mandibular bone in a child: a case report]. Zhonghua Kou Qiang Yi Xue Za Zhi 2022; 57:962-964. [PMID: 36097945 DOI: 10.3760/cma.j.cn112144-20211216-00553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Affiliation(s)
- S J Wang
- Department of Oral and Maxillofacial Surgery, School of Stomatology, The Fourth Military Medical University & State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Clinical Research Center for Oral Diseases, Xi'an 710032, China
| | - Z Q Zhang
- Department of Oral and Maxillofacial Surgery, School of Stomatology, The Fourth Military Medical University & State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Clinical Research Center for Oral Diseases, Xi'an 710032, China
| | - Y Sun
- Department of Oral and Maxillofacial Surgery, School of Stomatology, The Fourth Military Medical University & State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Clinical Research Center for Oral Diseases, Xi'an 710032, China
| | - C L Song
- Department of Oral and Maxillofacial Surgery, School of Stomatology, The Fourth Military Medical University & State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Clinical Research Center for Oral Diseases, Xi'an 710032, China
| | - Y W Yang
- Department of Oral and Maxillofacial Surgery, School of Stomatology, The Fourth Military Medical University & State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Clinical Research Center for Oral Diseases, Xi'an 710032, China
| | - J H Wei
- Department of Oral and Maxillofacial Surgery, School of Stomatology, The Fourth Military Medical University & State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Clinical Research Center for Oral Diseases, Xi'an 710032, China
| | - W Wu
- Department of Oral and Maxillofacial Surgery, School of Stomatology, The Fourth Military Medical University & State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Clinical Research Center for Oral Diseases, Xi'an 710032, China
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Cai W, Zhang JY, Chen HL, Yang YW, Wang J, Pang W, Zhou LJ. [Infective intracranial aneurysm after valve replacement in a patient with infective endocarditis]. Zhonghua Xin Xue Guan Bing Za Zhi 2022; 50:600-602. [PMID: 35705470 DOI: 10.3760/cma.j.cn112148-20210825-00733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Affiliation(s)
- W Cai
- Department of Neurosurgery, Affiliated Suqian First People's Hospital of Nanjing Medical University, Suqian 223800, China
| | - J Y Zhang
- Department of Neurosurgery, Affiliated Suqian First People's Hospital of Nanjing Medical University, Suqian 223800, China
| | - H L Chen
- Department of Neurosurgery, Affiliated Suqian First People's Hospital of Nanjing Medical University, Suqian 223800, China
| | - Y W Yang
- Department of Neurosurgery, Affiliated Suqian First People's Hospital of Nanjing Medical University, Suqian 223800, China
| | - J Wang
- Department of Neurosurgery, Affiliated Suqian First People's Hospital of Nanjing Medical University, Suqian 223800, China
| | - W Pang
- Department of Neurosurgery, Affiliated Suqian First People's Hospital of Nanjing Medical University, Suqian 223800, China
| | - L J Zhou
- Medical Imaging Center, Affiliated Hospital of Yangzhou University, Yangzhou 225012, China
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Shang S, Li G, Yang YW. [The Physician of the Shao Xing School in the Late Qing Dynasty -- Zhao Qingchu]. Zhonghua Yi Shi Za Zhi 2022; 52:147-151. [PMID: 35775267 DOI: 10.3760/cma.j.cn112155-20210304-00035] [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: 06/15/2023]
Abstract
Zhao Qingchu, a Confucian physician from the Kuaiji area at the end of the Qing Dynasty, learned from famous physicians of the Shao Xing School on exogenous febirle disease (Shang Han) and the You's of the Shi Cai School, drawing from the knowledge of the both medical schools. He quickly became popular for being a physician after giving up his research of Confucianism. He had a wide physician-patient network because of his art of healing as many politicians and celebrities such like Shao Youlian, Zeng Guoquan, Ren Daorong, Xu Yingkui and Ren Fuchang,were his patients. He was taken as a typical example of being good at the medical communication among doctors and doctors-patients in the Yangtze River area in the late Qing Dynasty. For instance, he once had a variety of medical communication with famous physicians, such as Wang Yuezhen, Ma Peizhi, He Lianchen, Zhang Wanxiang, Ling Jialiu and Zhou Bodu. He investigated medical theories in terms of exogenous febirle disease (Shang Han) and integrated his thinking with various medical schools, even attempting to involving western medicine. He was also skilled in teaching his medical thinking to his disciples, such as Zhao Shuan, Yang Zhian, Lu Dongchuan and He Jiren. Zhao Qingchu compiled his medical understanding based on his practice and experiences throughout his life and published this knowledge in Cun Cun Zhai Yi Hua Gao. He had it published many times, leading to a profound influence in Shaoxing and the Jiangnan area at that time.
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Affiliation(s)
- S Shang
- Institute of Science, Technology and Humanities, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - G Li
- Shanghai Museum of Traditional Chinese Medicine, Shanghai 201203, China
| | - Y W Yang
- Institute of Science, Technology and Humanities, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
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Xu CQ, Yang YW. [The epidemic and prevention of plagues in modern Shanghai]. Zhonghua Yi Shi Za Zhi 2021; 51:373-379. [PMID: 35130671 DOI: 10.3760/cma.j.cn112155-20200618-00091] [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
It was found that a variety of plagues were prevalent in Shanghai at the end of the Qing Dynasty and the beginning of the Republic of China, by analysing and synthesising the epidemic situation, the causes of the epidemic, the social impact, and prevention and control measures. These plagues led to serious social harm and economic losses. Their causes were believed closely related to some factors, such as urban environment, population flow, and climate changes. Their prevention appeared to be applicable and effective. The Shanghai concession and Chinese authorities organised society to fight against plagues and stabilise the social order. Charity organisations of the local communities were also involved in social support. It was found that more can be done in studies on interdisciplinary synthesis, comparative study of epidemic prevention measures of managers, and of traditional Chinese medicine prevention and treatment.
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Affiliation(s)
- C Q Xu
- Institute of Science, Technology and Humanities, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Y W Yang
- Institute of Science, Technology and Humanities, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
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Cao T, Yang YW, Yang X, Zhu HH. [Expression and significance of TGF-β1, p38MAPK and BMP-7 protein in liver specimens of patients with alveolar hepatic echinococcosis]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2021; 33:353-358. [PMID: 34505441 DOI: 10.16250/j.32.1374.2020229] [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: 11/27/2022]
Abstract
OBJECTIVE To detect the expression of transforming growth factor-β1 (TGF-β1), p38MAPK and bone morphogenetic protein-7 (BMP-7) protein in the liver specimens of patients with hepatic alveolar echinococcosis, and to investigate the potential role of TGF-β1, p38MAPK and BMP-7 protein in hepatic fibrosis caused by hepatic alveolar echinococcosis. METHODS A total of 20 patients with hepatic alveolar echinococcosis were enrolled as study subjects, and hepatic specimens were sampled from the sites within 0.5 cm (Group A) and 0.5 to 1.5 cm from hepatic alveolar echinococcosis lesions (Group B), while normal liver specimens sampled from the sites 2 cm and greater from hepatic alveolar echinococcosis lesions served as controls (Group C). The fibrosis of liver specimens was pathological examined using HE and Masson staining, and the expression of TGF-β1, p38MAPK and BMP-7 protein was quantified in liver tissues using Western blotting. The associations of TGF-β1, p38MAPK and BMP-7 protein expression with hepatic fibrosis were assessed. RESULTS HE staining showed the malaligned structure of hepatocytes and destruction of the structure of hepatic lobules at various degrees in liver specimens in groups A and B, with hepatocyte degeneration, atrophy and necrosis, hyperplasia of fibrous tissues and eosinophilic granulocyte infiltration seen, while no abnormal pathological alterations of liver tissues, normal hepatocyte structure and morphology and uniform size, no malaligned structure of hepatocytes, clear structure of hepatic lobules, no or mild hepatocyte degeneration or necrosis, and no eosinophilic granulocyte infiltration were seen in Group C. Masson staining showed that there was hyperplasia of multiple fibrous connective tissues in the liver portal areas in groups A and B, with fibrosis seen in hepatic lobules, while no obvious pathological changes were seen in Group C. There were significant differences seen in TGF-β1 (P < 0.001), p38MAPK (P < 0.01) and BMP-7 protein (P < 0.05) expression in liver tissues in groups A, B and C, and higher TGF-β1, p38MAPK and BMP-7 protein expression was quantified in groups A and B than in Group C (all P values < 0.05), while greater TGF-β1, p38MAPK and BMP-7 protein expression was detected in Group B than in Group C (all P values < 0.05). The expression of TGF-β1, p38MAPK and BMP-7 protein correlated positively with the severity of hepatic fibrosis (r = 0.866, 0.702 and 0.801, all P values < 0.05), and there were significant differences in TGF-β1 (F = 72.580, P < 0.01), p38MAPK (χ2 = 31.705, P < 0.01) and BMP-7 protein expression (χ2 = 48.388, P < 0.01) among liver tissues with different degrees of fibrosis. The TGF-β1 protein expression correlated positively with p38MAPK and BMP-7 protein expression (r = 0.607 and 0.702, both P values < 0.001), and the BMP-7 protein expression also correlated positively with p38MAPK protein expression (r = 0.456, P < 0.001). CONCLUSIONS The interaction among TGF-β1, p38MAPK and BMP-7 jointly participates in the development of hepatic fibrosis induced hepatic alveolar echinococcosis.
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Affiliation(s)
- T Cao
- Department of General Surgery, Qinghai Provincial People's Hospital, Xining 810007, China.,Department of Gastrointestinal Surgery, Kaizhou District People's Hospital, Chongqing City, China
| | - Y W Yang
- Department of General Surgery, Qinghai Provincial People's Hospital, Xining 810007, China
| | - X Yang
- Department of General Surgery, Qinghai Provincial People's Hospital, Xining 810007, China
| | - H H Zhu
- Department of General Surgery, Qinghai Provincial People's Hospital, Xining 810007, China
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Reich K, Gordon KB, Strober BE, Armstrong AW, Miller M, Shen YK, You Y, Han C, Yang YW, Foley P, Griffiths CEM. Five-year maintenance of clinical response and health-related quality of life improvements in patients with moderate-to-severe psoriasis treated with guselkumab: results from VOYAGE 1 and VOYAGE 2. Br J Dermatol 2021; 185:1146-1159. [PMID: 34105767 DOI: 10.1111/bjd.20568] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/07/2021] [Indexed: 01/19/2023]
Abstract
BACKGROUND Psoriasis is a chronic disease requiring long-term therapy. OBJECTIVES Physician- and patient-reported outcomes were evaluated through week 252 in VOYAGE 1 and VOYAGE 2. METHODS In total, 1829 patients were randomized at baseline to receive guselkumab 100 mg every 8 weeks, placebo or adalimumab. Patients receiving placebo crossed over to guselkumab at week 16. Patients receiving adalimumab crossed over to guselkumab at week 52 in VOYAGE 1, and randomized withdrawal and retreatment occurred at weeks 28-76 in VOYAGE 2; all patients then received open-label guselkumab through week 252. Efficacy and health-related quality of life (HRQoL) endpoints were analysed through week 252. Safety was monitored through week 264. RESULTS The proportions of patients in the guselkumab group who achieved clinical responses at week 252 in VOYAGE 1 and VOYAGE 2, respectively, were 84·1% and 82·0% [≥ 90% improvement in Psoriasis Area and Severity Index (PASI)]; 82·4% and 85·0% [Investigator's Global Assessment (IGA) 0 or 1]; 52·7% and 53·0% (100% improvement in PASI) and 54·7% and 55·5% (IGA 0). HRQoL endpoints were achieved as follows: 72·7% and 71·1% of patients (Dermatology Life Quality Index 0 or 1: no effect on patient's life); 42·4% and 42·0% [Psoriasis Symptoms and Signs Diary (PSSD) symptom score = 0] and 33·0% and 31·0% (PSSD sign score = 0). As measured in VOYAGE 2 only, approximately 45% of patients achieved ≥ 5-point reduction in Short Form-36 physical and mental component scores, and 80% reported no anxiety or depression (Hospital Anxiety and Depression Scale scores < 8). Similar findings were reported for adalimumab crossovers. These effects were maintained from week 52 in VOYAGE 1 and week 100 in VOYAGE 2. No new safety signals were identified. CONCLUSIONS Guselkumab maintains high levels of clinical response and improvement in patient-reported outcomes through 5 years in patients with moderate-to-severe psoriasis.
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Affiliation(s)
- K Reich
- Translational Research in Inflammatory Skin Diseases, Institute for Health Services Research in Dermatology and Nursing, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - K B Gordon
- Medical College of Wisconsin, Milwaukee, WI, USA
| | - B E Strober
- Yale University, New Haven, CT, USA.,Central Connecticut Dermatology Research, Cromwell, CT, USA
| | - A W Armstrong
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - M Miller
- Janssen Research & Development, LLC, Spring House, PA, USA
| | - Y K Shen
- Janssen Research & Development, LLC, Spring House, PA, USA
| | - Y You
- Janssen Research & Development, LLC, Spring House, PA, USA
| | - C Han
- Janssen Global Services, LLC, Horsham and Malvern, PA, USA
| | - Y W Yang
- Janssen Global Services, LLC, Horsham and Malvern, PA, USA
| | - P Foley
- The University of Melbourne, St Vincent's Hospital Melbourne and Probity Medical Research, Skin Health Institute, Carlton, VIC, Australia
| | - C E M Griffiths
- Dermatology Centre, Salford Royal Hospital, University of Manchester, Manchester, UK
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Zhang N, Ding JQ, Wang YP, Liu XN, Li YQ, Liu MF, Fu ZM, Yang YW, Su J, Song GL, Yang F, Guo YY, Liu JM. Enhanced high temperature ferromagnetism in Bi 1-xRxFeO 3( R= Dy, Y) compounds. J Phys Condens Matter 2021; 33:135803. [PMID: 33527915 DOI: 10.1088/1361-648x/abdb10] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 01/12/2021] [Indexed: 06/04/2023]
Abstract
In this work we report experimental evidence for the weak high-temperature ferromagnetism in Bi1-xRxFeO3(R= Dy, Y) compounds by systematic characterizations, excluding the possible side-effects from other iron-based impurities. Remarkable saturated magnetic moment was observed in the Y-substituted samples, Bi1-xYxFeO3, which is larger than the moment obtained in Bi1-xDyxFeO3, the Dy-substituted samples with antiferromagnetic background. The physical origin of the weak ferromagnetic transition is discussed and serious lattice distortions have been identified based on the x-ray diffraction and Raman scattering data, although the rhombohedral structure symmetry remains unchanged upon the substitutions. It is believed that the structural distortion suppressed cycloid spin structure is the main factor for the enhanced magnetization in Bi1-xRxFeO3compounds. Additionally, the Dy3+-Fe3+antiferromagnetic coupling, which strengthens the antiferromagnetic interaction in Bi1-xDyxFeO3compounds, acts as the driving force for the magnetic discrepancy between Bi1-xYxFeO3and Bi1-xDyxFeO3samples.
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Affiliation(s)
- N Zhang
- School of Physics, Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - J Q Ding
- School of Physics, Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - Y P Wang
- School of Physics, Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - X N Liu
- School of Physics, Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - Y Q Li
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People's Republic of China
| | - M F Liu
- Institute for Advanced Materials, Hubei Normal University, Huangshi 435002, People's Republic of China
| | - Z M Fu
- School of Physics, Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - Y W Yang
- School of Physics, Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - J Su
- School of Physics, Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - G L Song
- School of Physics, Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - F Yang
- School of Physics, Henan Key Laboratory of Photovoltaic Materials, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - Y Y Guo
- College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, People's Republic of China
| | - J-M Liu
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People's Republic of China
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Sun B, Qu Z, Cheng GL, Yang YW, Miao YF, Chen XG, Zhou XB, Li B. Urinary microRNAs miR-15b and miR-30a as novel noninvasive biomarkers for gentamicin-induced acute kidney injury. Toxicol Lett 2020; 338:105-113. [PMID: 33290828 DOI: 10.1016/j.toxlet.2020.12.006] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 11/29/2020] [Accepted: 12/03/2020] [Indexed: 12/12/2022]
Abstract
MicroRNAs serve as potential biomarkers in various pathological models, and are stable and detectable in biofluids. We investigated the urinary microRNA expression profile in a gentamicin-induced acute kidney injury canine model using RNA sequencing. A total of 234 differentially expressed microRNAs were screened after 12 consecutive days of gentamicin administration (P < 0.05). Six candidate microRNAs (miR-15b, -15b-3p, -16, -30a, -30a-3p, and -30c-2-3p) were selected according to a set criterion, and validated by real-time quantitative PCR. The diagnostic values of these six candidate microRNAs were better than the traditional serum biomarkers (all P < 0.05). Further, using receiver operating characteristic curve analysis, we found that miR-15b and -15b-3p were superior to urinary kidney injury molecule-1 (both P < 0.05). Moreover, miR-15b and -30a levels in the urine samples significantly correlated with their respective levels in the kidney tissue samples (r=0.512 and 0.505, respectively, both P < 0.05). Our data concluded that miR-15b and -30a may be promising biomarkers for renal toxicity.
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Affiliation(s)
- B Sun
- College of Bioengineering, Beijing Polytechnic, Beijing, 100029, China; National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, Daxing District, Beijing, 100176, China
| | - Z Qu
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, Daxing District, Beijing, 100176, China
| | - G L Cheng
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, Daxing District, Beijing, 100176, China
| | - Y W Yang
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, Daxing District, Beijing, 100176, China
| | - Y F Miao
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, Daxing District, Beijing, 100176, China
| | - X G Chen
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China
| | - X B Zhou
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, Daxing District, Beijing, 100176, China.
| | - B Li
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, Daxing District, Beijing, 100176, China.
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14
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Wang QY, Yang YW, Cao YY, Zhu Q, Huang YG, Hu YH, Zhou YJ, Li X, Wei YF, Shu PY, Wang YF, Zhang J. Construction of SNP-STR Multiplex Amplification System with Genetic Markers and Its Forensic Application. Fa Yi Xue Za Zhi 2020; 36:316-315. [PMID: 32705843 DOI: 10.12116/j.issn.1004-5619.2020.03.005] [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: 12/19/2019] [Indexed: 11/30/2022]
Abstract
Abstract Objective To select and develop a SNP-STR multiplex amplification system with genetic markers compatible with current STR databases. To understand its genetic polymorphisms in Sichuan Han population and its application value in DNA mixture analysis. Methods Based on the STR genetic markers in commercial kits, SNPs adjacent to these STR markers were selected to be SNP-STR genetic markers. A SNP-STR multiplex amplification system with genetic markers based on allele-specific amplification was constructed using allele-specific amplification primers. The genetic polymorphism of the system in the Sichuan Han population was investigated and the efficiency of systems with different numbers of loci to detect the two individual DNA mixture samples was evaluated. Results An allele-specific multiplex amplification system constituted of 13 SNP-STR genetic markers was selected and constructed. In Sichuan Han population, the heterozygosity of each locus ranged from 0.76 to 0.88, and the combined discrimination power reached 0.999 999 999 999 999 968. In the analysis of the two individual DNA mixture samples: for single-locus amplification, the genotype of the minor components can still be detected when the mixture ratio reaches 1 000∶1; for multiple loci multiplex amplification, the maximum mixture ratio can reach 500∶1. As the number of loci in the system increased, the detection efficiency of the minor components in the DNA mixture decreased. Conclusion SNP-STR genetic markers have a higher polymorphism than STR. The multiplex amplification system made of SNP-STR genetic markers has a better analysis efficiency for mixed samples than traditional STR multiplex amplification system.
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Affiliation(s)
- Q Y Wang
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Y W Yang
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Y Y Cao
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Q Zhu
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Y G Huang
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Y H Hu
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Y J Zhou
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - X Li
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Y F Wei
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - P Y Shu
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Y F Wang
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - J Zhang
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
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Yang QQ, Wang SL, Liu WJ, Yang YW, Jiang SQ. Spatial distribution of perfluoroalkyl acids (PFAAs) and their precursors and conversion of precursors in seawater deeply affected by a city in China. Ecotoxicol Environ Saf 2020; 194:110404. [PMID: 32146197 DOI: 10.1016/j.ecoenv.2020.110404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 10/07/2019] [Revised: 02/25/2020] [Accepted: 02/27/2020] [Indexed: 06/10/2023]
Abstract
Conversion of perfluoroalkyl acid (PFAA) precursors in the environment has been a hotspot research in recent years. This study firstly determined the spatial distribution of PFAAs and their precursors including 8:2 fluorotelomer unsaturated acid (8:2 FTUCA), perfluorooctane sulfoneamide (FOSA), and diperfluorooctane sulfonamido ethanol-based phosphate (di-SAmPAP), then investigated the conversion of the potential precursors in the seawater and sewage treatment plants (STPs) effluents. The results indicated that the target pollutants showed a typical concentration gradient from nearshore to offshore. And the obviously increased concentration of perfluorinated carboxylic acids (△[PFCAs]) after oxidation treatment can verify the existence of PFAA precursors in the seawater and STP effluents. The concentrations of PFCAs with carbon atom numbers 4-9 (PFCAC4-C9) revealed the most increase. Moreover, the levels of △[PFCAs] and the ratios of △[PFCAs] to their concentration before oxidation (△[PFCA]/[PFCA]before oxidation) indicated obvious spatial variations in the seawater and STP effluents. The higher levels of △[PFCAC4-C12] and the lower ratios of ∑△[PFCAC4-C12]/∑[PFAA]before oxidation were observed in the STP effluents, which implied that precursors might be decomposed during the sewage treatment process. These results suggested the STP effluents might have an important effect on the PFAAs levels of seawater.
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Affiliation(s)
- Q Q Yang
- School of Geography and Tourism, Qufu Normal University, Rizhao, 276826, China
| | - S L Wang
- School of Life Science, Qufu Normal University, Qufu, 273165, China
| | - W J Liu
- School of Life Science, Qufu Normal University, Qufu, 273165, China
| | - Y W Yang
- School of Life Science, Qufu Normal University, Qufu, 273165, China.
| | - S Q Jiang
- Changshushi Middle School, Changshu, 215500, China
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16
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Yang YW, Lehrer MD, Mangold AR, Yiannias JA, Nelson SA, Pittelkow MR. Treatment of granuloma annulare and related granulomatous diseases with sulphasalazine: a series of 16 cases. J Eur Acad Dermatol Venereol 2020; 35:211-215. [PMID: 32216136 DOI: 10.1111/jdv.16356] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 02/21/2020] [Accepted: 02/28/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND Granuloma annulare (GA) and the related annular elastolytic giant cell granuloma (AEGCG) and interstitial granulomatous dermatitis (IGD) are idiopathic histiocytic inflammatory disorders, which are frequently recalcitrant to treatment. OBJECTIVES Evaluate the efficacy of sulphasalazine in treating GA, AEGCG and IGD. METHODS Sixteen patients were identified with granulomatous disease who were treated with sulphasalazine between September 2015 and September 2019. Outcomes were based on patients' and providers' subjective evaluations. RESULTS Sixteen patients were included in the study (ages 56-89, four male and twelve female). Previous treatments were attempted in fifteen patients. Clinical improvement was seen in fourteen patients (87.5%). Initial improvement was noted within a mean (SD) of 66.4 (35.1) days after starting therapy, with increasing benefits over time. Ten patients (62.5%) reported complete or near-complete clearance, three patients (18.8%) reported significant improvement, and one (6.3%) reported partial improvement. Twelve patients elected to stop or reduce therapy, resulting in relapse or worsening in five patients. CONCLUSIONS Sulphasalazine may be considered as treatment for GA and GA-related conditions.
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Affiliation(s)
- Y W Yang
- Mayo Clinic, Scottsdale, AZ, USA
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17
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Yang YW, Zhao M, Zhang LQ, Qiao P, Bai X, Zhang XX, Walcott RR, Guan W, Zhao TC. Development of a multiplex PCR assay based on the pilA gene sequences to detect different types of Acidovorax citrulli. J Microbiol Methods 2019; 158:93-98. [PMID: 30742840 DOI: 10.1016/j.mimet.2019.02.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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: 09/29/2018] [Revised: 01/28/2019] [Accepted: 02/05/2019] [Indexed: 11/24/2022]
Abstract
Bacterial fruit blotch (BFB) of cucurbits, caused by Acidovorax citrulli, is a major threat to commercial watermelon and melon production worldwide. At present, there are at least two genetically distinct sub-populations (group I and II) of A. citrulli that differ in host preference among cucurbit species and copper sensitivity. In this study, we analyzed the pilA gene sequences of 103 A. citrulli strains from China and other countries. Based on these data, we classified all tested A. citrulli strains into three types. The pilA-based type 1 strains in this study coincided with the previously established group I strains; while the type 2 strains coincided with group II strains. Ten strains that did not cluster with group I or II strains were classified into a new type, designated type 3. Based on differences in pilA sequences, we designed a multiplex PCR assay to distinguish the three A. citrulli pilus types. This multiplex PCR assay has proven to be viable for strain typing of 139 A. citrulli strains and for the detection of this pathogen in artificially inoculated seeds and leaves and naturally infected leaves and fruits. This assay proved to be rapid, accurate, reliable and applicable for early distinction of A. citrulli types associated with BFB epidemics. It may also inform the judicious and environmentally sound use of bactericides, especially copper-based compounds.
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Affiliation(s)
- Y W Yang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Chinese Academy of Agricultural Sciences, Institute of Plant Protection, Beijing, China; College of Plant Protection, China Agricultural University, Beijing, China
| | - M Zhao
- Department of Plant Pathology, University of Georgia, Athens, GA, USA
| | - L Q Zhang
- College of Plant Protection, China Agricultural University, Beijing, China
| | - P Qiao
- Faculty of Agronomy, Jilin Agricultural University, Changchun, China
| | - X Bai
- Faculty of Agronomy, Jilin Agricultural University, Changchun, China
| | - X X Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Chinese Academy of Agricultural Sciences, Institute of Plant Protection, Beijing, China
| | - R R Walcott
- Department of Plant Pathology, University of Georgia, Athens, GA, USA
| | - W Guan
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Chinese Academy of Agricultural Sciences, Institute of Plant Protection, Beijing, China
| | - T C Zhao
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Chinese Academy of Agricultural Sciences, Institute of Plant Protection, Beijing, China.
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18
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Kang M, Tan XH, Yang YW, Wu J, Zheng HZ, Song T. [Epidemiological characteristics of influenza in Guangdong province, during winter of 2017-2018]. Zhonghua Liu Xing Bing Xue Za Zhi 2018; 39:1071-1076. [PMID: 30180430 DOI: 10.3760/cma.j.issn.0254-6450.2018.08.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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 understand the epidemiological characteristics of influenza in Guangdong province, during the winter of 2017-2018, to provide evidence for response to the diversity of influenza, in different seasonal patterns. Methods: Data on weekly influenza surveillance from January 2016 to April 2018, were collected in Guangdong. Information on patients with Influenza-like illness (ILI), on influenza virus positive rates and on outbreaks during the winter of 2017 to 2018, was analyzed and compared with those in spring of 2016 and summer of 2017. χ(2) test and Fisher exact test were used. Results: In the above said winter, the average percentage of visits for ILI in 28 hospitals where sentinel surveillance program had been set, was 4.99% (157 235/3 149 656), which was above the level of the same period in the previous five years. The positive rates of influenza virus among samples collected from ILI outpatients and hospitalized cases under severe acute respiratory infection (SARI) were 28.33% (2 137/7 543) and 14.93% (256/1 715), with the proportions of B (Yamagata) as 70.43% (1 505/2 137) and 73.05% (187/256) respectively. A total of 257 influenza outbreaks were reported in the winter period, with 82.49% (212/257) occurred in elementary schools. Cases aged 6-14 years occurred in winter and spring appeared of having higher positive rate than those seen in summer (P<0.05) whereas elderly cases aged 60 and above showed higher positive rate in summer than those in winter and spring two seasons (P<0.05). Conclusions: Epidemiological characteristics of influenza appeared in Guangdong province, during the winter from 2017 to 2018, were correlated to Influenza B (Yamagata). Capacity on the implementation of surveillance programs and on the coverage of vaccination should be improved and increased in order to control influenza in different epidemic seasons, in Guangzhou.
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Affiliation(s)
- M Kang
- Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China; School of Public Health, Southern Medical Universiry, Guangzhou 510515, China
| | - X H Tan
- Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - Y W Yang
- Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - J Wu
- Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - H Z Zheng
- Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
| | - T Song
- Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
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Yang YW, Yu F, Zhang HC, Dong Y, Qiu YN, Jiao Y, Xing XD, Tian M, Huang L, Chen JH. Physicochemical properties and cytotoxicity of an experimental resin-based pulp capping material containing the quaternary ammonium salt and Portland cement. Int Endod J 2017; 51:26-40. [PMID: 28375561 DOI: 10.1111/iej.12777] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [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: 09/28/2016] [Accepted: 03/29/2017] [Indexed: 11/26/2022]
Abstract
AIM To evaluate in vitro the physicochemical properties, cytotoxicity and calcium phosphate nucleation of an experimental light-curable pulp capping material composed of a resin with antibacterial monomer (MAE-DB) and Portland cement (PC). METHODOLOGY The experimental material was prepared by mixing PC with a resin containing MAE-DB at a 2 : 1 ratio. Cured pure resin containing MAE-DB served as control resin. ProRoot MTA and Dycal served as commercial controls. The depth of cure, degree of monomer conversion, water absorption and solubility of dry samples, calcium release, alkalinizing activity, calcium phosphate nucleation and the cytotoxicity of materials were evaluated. Statistical analysis was carried out using anova followed by Tukey's HSD test (equal variance assumed) or Tamhane test (equal variance not assumed) and independent-samples t-tests. RESULTS The experimental material had a cure depth of 1.19 mm, and the mean degree of monomer conversion was 70.93% immediately post-cure and 88.75% at 24 h post-cure. The water absorption of the experimental material was between those of MTA and Dycal, and its solubility was significantly less (P < 0.05) than that of Dycal and higher than that of MTA. The experimental material exhibited continuous calcium release and an alkalinizing power between those of MTA and Dycal throughout the test period. Freshly set experimental material, control resin and all 24-h set materials had acceptable cytotoxicity. The experimental material, MTA and Dycal all exhibited the formation of apatite precipitates after immersion in phosphate-buffered saline. CONCLUSIONS The experimental material possessed adequate physicochemical properties, low cytotoxicity and good calcium phosphate nucleation.
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Affiliation(s)
- Y W Yang
- Department of Stomatology, Lanzhou General Hospital, Lanzhou Military Area Command of Chinese PLA, Lanzhou, Gansu, China.,State Key Laboratory of Military Stomatology & National Clinical Research Centre for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - F Yu
- State Key Laboratory of Military Stomatology & National Clinical Research Centre for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - H C Zhang
- Department of Clinical Nursing, School of Nursing, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Y Dong
- State Key Laboratory of Military Stomatology & National Clinical Research Centre for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Y N Qiu
- Department of Stomatology, Lanzhou General Hospital, Lanzhou Military Area Command of Chinese PLA, Lanzhou, Gansu, China
| | - Y Jiao
- Department of Stomatology, PLA Army General Hospital, Beijing, China
| | - X D Xing
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, China
| | - M Tian
- State Key Laboratory of Military Stomatology & National Clinical Research Centre for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - L Huang
- State Key Laboratory of Military Stomatology & National Clinical Research Centre for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of General Dentistry and Emergency, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - J H Chen
- State Key Laboratory of Military Stomatology & National Clinical Research Centre for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
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Tang CH, Wang BCM, Furnback WE, Ney JP, Yang YW, Fang CH, Hsu PN. Estimating Health Care Resource Utilization of Patients with Rheumatoid Arthritis in Taiwan Using a National Claims Database. Value Health 2014; 17:A774. [PMID: 27202861 DOI: 10.1016/j.jval.2014.08.335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- C H Tang
- Taipei Medical University, Taipei, Taiwan
| | - B C M Wang
- Alliance Life Sciences, Somerset, NJ, USA
| | | | - J P Ney
- University of Washington, Seattle, WA, USA
| | - Y W Yang
- Pfizer Limited, New Taipei City, Taiwan
| | | | - P N Hsu
- National Taiwan University, Taipei, Taiwan
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21
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Zhu HJ, Yang YW, Zhu Y. An efficient and rapid thin-layer chromatography method for the identification of 32 dye substances in hair dye products. Int J Cosmet Sci 2014; 36:369-78. [PMID: 24750099 DOI: 10.1111/ics.12135] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 04/14/2014] [Indexed: 11/29/2022]
Abstract
OBJECTIVE The use of dye substances in hair dye products has led to controversial public and scientific discussions about their impact on human health. This study aimed to explore a rapid method for identification of dye substances in hair dye products. METHODS Thin layer chromatography (TLC) method was conducted in this study. We developed basic data of 32 dye substances by 4 developing solvents and 2 indicator sprays. The dye substances were identified by comparing the Rf values and colors between samples and reference substances. RESULTS Thirty samples were identified by the established method. 22 hair dye substances were detected in 16 formula known samples, 15 hair dye substances were detected in 14 formula unknown samples. Four laboratories participated in the validation and the results showed good interlaboratory reproducibility. CONCLUSION The developed TLC method is simple, rapid, reliable and can be finely used for identification of dye substances in hair dye products.
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Affiliation(s)
- H J Zhu
- Institute for Environmental Health and Related Product Safety, Chinese Center for Disease Control and Prevention, Beijing, 100021, China
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22
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Yang YW, Cheng WP, Lu JK, Dong XH, Wang CB, Zhang J, Zhao LY, Gao ZF. Timing of xenon-induced delayed postconditioning to protect against spinal cord ischaemia-reperfusion injury in rats. Br J Anaesth 2013; 113:168-76. [PMID: 24277726 DOI: 10.1093/bja/aet352] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND This study was designed to assess the neuroprotective effect of xenon-induced delayed postconditioning on spinal cord ischaemia-reperfusion injury (IRI) and to determine the time of administration for best neuroprotection in a rat model of spinal cord IRI. METHODS Fifty male rats were randomly divided equally into a sham group, control group, and three xenon postconditioning groups (n=10 per group). The control group underwent spinal cord IRI and immediately inhaled 50% nitrogen/50% oxygen for 3 h at the initiation of reperfusion. The three xenon postconditioning groups underwent the same surgical procedure and immediately inhaled 50% xenon/50% oxygen for 3 h at the initiation of reperfusion or 1 and 2 h after reperfusion. The sham operation group underwent the same surgical procedure without aortic occlusion, and inhaled 50% nitrogen/50% oxygen. Neurological function was assessed using the Basso, Beattie, and Bresnahan score at 4, 24, and 48 h of reperfusion. Histological examination was performed using Nissl staining and immunohistochemistry, and apoptosis was detected by terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick end-labelling staining. RESULTS Compared with the control group, the three xenon postconditioning groups showed improvements in neurological outcomes, and had more morphologically normal neurones at 48 h of reperfusion. Apoptotic cell death was reduced and the ratio of Bcl-2/Bax immunoreactivity increased in xenon-treated rats compared with controls. CONCLUSIONS Xenon postconditioning up to 2 h after reperfusion provided protection against spinal cord IRI in rats, but the greatest neuroprotection occurred with administration of xenon for 1 h at reperfusion.
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Affiliation(s)
- Y W Yang
- Department of Anaesthesiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing 100029, China
| | - W P Cheng
- Department of Anaesthesiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing 100029, China
| | - J K Lu
- Department of Anaesthesiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing 100029, China
| | - X H Dong
- Department of Anaesthesiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing 100029, China
| | - C B Wang
- Department of Anaesthesiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing 100029, China
| | - J Zhang
- Department of Anaesthesiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing 100029, China
| | - L Y Zhao
- Department of Anaesthesiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing 100029, China
| | - Z F Gao
- Department of Anaesthesiology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing 100029, China
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Liu Z, Yang Y, Li R, Huang L, Zhang T. Formation and mechanical properties of Zr-based bulk metallic glass composites with high oxygen levels. Chin Sci Bull 2012. [DOI: 10.1007/s11434-012-5293-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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24
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Kong LY, Su BG, Bao ZB, Xing HB, Yang YW, Ren QL. Direct quantification of mono- and di-D-α-tocopherol polyethylene glycol 1000 succinate by high performance liquid chromatography. J Chromatogr A 2011; 1218:8664-71. [PMID: 22035696 DOI: 10.1016/j.chroma.2011.10.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Revised: 09/25/2011] [Accepted: 10/07/2011] [Indexed: 11/24/2022]
Abstract
A simple and direct reversed-phase high performance liquid chromatography (RP-HPLC) method with UV detection was developed and validated for the determination of mono- and di-D-α-tocopherol polyethylene glycol 1000 succinate (TPGS 1000) in TPGS mixture. Before the HPLC analysis, mono- and di-TPGS 1000 were separated by simulated moving bed (SMB) chromatography system and characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The mass spectrometric results confirmed that the molar mass distribution of TPGS prepared in our laboratory was very close to that of the product of Eastman Chemical Company with similar n¯ (average polymerization degree), M(n)¯ (number-average molecular weight) and M(w)¯ (weight-average molecular weight). The HPLC analysis was carried out on a C30 analytical column with mobile phases comprised of acetonitrile (A) and isopropanol (B) in gradient conditions. Validation of the analytical method was done on the following parameters: system suitability, linearity, limits of detection and quantification, accuracy and precision, method robustness and solution stability. The linearity of the calibration curves for mono- and di-TPGS 1000 from both sources was found to be good (r(2)>0.9996). The recovery values were from 94.6% to 103.3% for mono-TPGS, and 93.5% to 103.3% for di-TPGS. This method could be successfully used in the direct quantification of mono- and di-TPGS in TPGS 1000 mixture using TPGS standards with similar molecular mass distributions although derived from different sources.
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Affiliation(s)
- L Y Kong
- Department of Chemical and Biological Engineering, Institute of Pharmaceutical Engineering, Zhejiang University, Hangzhou, China
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Yang YW, Tsai CL, Lu CY. Exclusive breastfeeding and incident atopic dermatitis in childhood: a systematic review and meta-analysis of prospective cohort studies. Br J Dermatol 2009; 161:373-83. [PMID: 19239469 DOI: 10.1111/j.1365-2133.2009.09049.x] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Breastfeeding is undisputedly preferable to formula feeding for infant nutrition because of its nutritional, immunological and psychological benefits. However, studies on the association between breastfeeding and development of atopic dermatitis (AD) have shown inconsistent results. OBJECTIVES To examine the association between exclusive breastfeeding for at least 3 months after birth and the development of AD in childhood. METHODS An electronic literature search of MEDLINE (January 1966-May 2008) and EMBASE (1980-May 2008) was conducted. Prospective cohort studies that met the predetermined criteria were independently assessed by three reviewers. The pooled effect estimate was calculated by random effects model. Heterogeneity across the studies was investigated by meta-regression analysis. RESULTS Twenty-one studies with 27 study populations were included for meta-analysis. The summary odds ratio (OR) for the effect of exclusive breastfeeding on the risk of AD was 0.89 (95% confidence interval, CI 0.76-1.04). Heterogeneity was found across the studies (chi(2) = 83.6, d.f. = 26; P < 0.001). Breastfeeding was associated with a decreased risk of AD (OR 0.70; 95% CI 0.50-0.99) when analysis was restricted to the studies comparing breastfeeding with conventional formula feeding. The pooled OR for study populations with atopic heredity was 0.78 (95% CI 0.58-1.05). CONCLUSIONS There is no strong evidence of a protective effect of exclusive breastfeeding for at least 3 months against AD, even among children with a positive family history.
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Affiliation(s)
- Y W Yang
- Department of Dermatology, Taipei Medical University Hospital, Sinyi District, Taipei City, Taiwan.
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26
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Abstract
Speciation and possible reaction paths of nanosize copper pollutants extracted with a RTIL (room-temperature ionic liquid ([C4mim][PF6], 1-butyl-3-methylimidazolium hexafluorophosphate)) have been studied in the present work. Experimentally, in a very short contact time (2 min), 80-95% of nanosize CuO as well as other forms of copper (such as nanosize Cu, Cu2+, or Cu(II)(ads) (in the channels of MCM-41)) in the samples could be extracted into the RTIL. The main copper species extracted in the RTIL as observed by XANES (X-ray absorption near edge structure) were Cu(II). Existence of Cu-N bondings with coordination numbers (CNs) of 3-4 for copper extracted in the RTIL was found by EXAFS (extended X-ray absorption fine structural) spectroscopy. Interestingly, chelation of Cu(II) with 1-methylimidazole (MIm) in the RTIL during extraction was also observed by 1H NMR (nuclear magnetic resonance). At least two possible reaction paths for the rapid extraction of nanosize copper pollutants with the RTIL might occur: (1) an enhanced dissolution of nanosize CuO (to form Cu2+) and (2) formation of [Cu(MIm)4(H2O)2]2+ that acted as a carrier of copper into the RTIL matrix.
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Affiliation(s)
- Hsin-Liang Huang
- Department of Environmental Engineering, National Cheng Kung University, Tainan City 701, Taiwan
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Tsai CH, Chang FC, Su YC, Tsai FJ, Lu MK, Lee CC, Kuo CC, Yang YW, Lu CS. Two novel mutations of the glycine receptor gene in a Taiwanese hyperekplexia family. Neurology 2004; 63:893-6. [PMID: 15365143 DOI: 10.1212/01.wnl.0000138566.65519.67] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The authors report a Taiwanese family with autosomal recessive hyperekplexia. Two novel mutations, W96C (from the paternal allele) and R344X (from the maternal allele), which are located in exon 4 and exon 7 of the GLRA1 gene, were identified in this family. A series of electrophysiologic investigations were conducted in one of the probands, and the results suggest that the "startle center" is located subcortically.
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MESH Headings
- Acoustic Stimulation
- Adult
- Amino Acid Substitution
- Brain/physiopathology
- DNA Mutational Analysis
- Electromyography
- Evoked Potentials, Motor
- Female
- Genes, Recessive
- Humans
- Magnetics
- Mutation, Missense
- Pedigree
- Physical Stimulation
- Point Mutation
- Polymorphism, Single-Stranded Conformational
- Receptors, Glycine/genetics
- Reflex, Abnormal/genetics
- Reflex, Startle/genetics
- Reflex, Startle/physiology
- Reflex, Stretch/genetics
- Sequence Analysis, DNA
- Taiwan/epidemiology
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Affiliation(s)
- C H Tsai
- Neuroscience Laboratory, Department of Neurology, China Medical University Hospital, Taichung, Taiwan
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28
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Affiliation(s)
- Y C Lee
- Department of Environmental Science, Tunghai University, Taichung City, Taiwan 407, Republic of China
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29
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Affiliation(s)
- P Y Chang
- Department of Environmental Science, Tunghai University, Taichung City, 407 Taiwan, Republic of China
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Lee CY, Wei YL, Tsai HN, Yang YW, Lee JF. Characterization of lead species in Al2O3 contaminated with lead(II). Bull Environ Contam Toxicol 2003; 71:833-839. [PMID: 14672139 DOI: 10.1007/s00128-003-0211-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Affiliation(s)
- C Y Lee
- Department of Environmental Science, Tunghai University, Taichung City, 407 Taiwan, Republic of China
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31
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Affiliation(s)
- M J Hu
- Department of Environmental Science, Tunghai University, Taichung City, 407 Taiwan, Republic of China
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32
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Ting CK, Lin SM, Yang YW, Tsai HJ, Lao HC, Chu YC, Tsai SK. Reversal of mivacurium chloride: edrophonium of spontaneous recovery in microscopic laryngeal surgery. Acta Anaesthesiol Sin 2001; 39:157-62. [PMID: 11840581] [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: 02/23/2023]
Abstract
BACKGROUND A double-blind, randomized study was designed to compare the recovery manner of mivacurium infusion with or without edrophonium reversal in microscopic laryngeal surgery. Neuromuscular blockade was quantified using the train-of-four stimuli to the ulnar nerve and quantification of the ratio of the fourth twitch to the first twitch. METHODS With the approval of the Human Studies Committee of the Taipei Veterans General Hospital and patient informed consent, 40 healthy (ASA I or II) patients with age from 24 to 54 years, undergoing microscopic laryngeal surgery were randomly selected for study. Mivacurium chloride 0.2 mg/kg was given intravenously, and then it was given in continuous infusion to maintain muscle relaxation at 90% twitch block during the procedure. At the end of operation, mivacurium infusion was terminated. In a double-blind manner, group I patients (n = 20) received intravenous edrophonium 1 mg/kg and atropine 0.01 mg/kg for reversal when T1 was at 10% recovery whereas patients in Group II (n = 20) received placebo in the same manner. Mean infusion rate, recovery index (RI50, time from T1 25% to T1 50%; RI75, time from T1 25% to T1 75%), extubation time, and discharge time between groups were compared. Nausea, vomiting, and dysrhythmias were also documented until the patient was discharged from hospital. RESULTS The demographic data between two groups were similar. The recovery index (RI75) for group I was shorter than that of placebo group (5.3 +/- 2.19 min vs. 7.3 +/- 0.9 min) and the difference was statistically significant (P = 0.017). There were no statistically significant differences in mean infusion rate, incidence of nausea and vomiting, and discharge time from the POR. The incidence of tachycardia or arrhythmia in group I was significantly greater than that in group placebo. CONCLUSIONS Mivacurium, a short-acting nondepolarizing agent, is a suitable muscle relaxant for patients receiving microscopic laryngeal surgery. Recovery time with the use of edrophonium as reversal agent was shorter than with placebo, but extubation and discharge time did not differ in two groups. The time which could be saved by the use of edrophonium for reversal of mivacurium to hasten the maximal recovery appears to be less than a few minutes. Therefore, clinically, the value of routine use of edrophonium to obtain a faster recovery does not outweigh its demerits of cost and risk and is not worthy of recommendation.
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Affiliation(s)
- C K Ting
- Department of Anesthesiology, Taipei Veterans General Hospital, School of Medicine, National Yang-Ming University, 201, Sec. 2, Shi-Pai Rd, Pei-Tou 112, Taipei, Taiwan, R.O.C
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Abstract
Experimentally, CCl4 was effectively mineralized by CuO to yield stable inorganic species of CO2 and CuCl2 (CCl4 + 2CuO --> 2CuCl2 + CO2). High CCl4 conversions (63-83%) were found in the mineralization process performed at 513-603 K for 10-30 min. Using X-ray-absorption near edge structure (XANES) and X-ray photoelectron spectroscopies, we found that most CuCl2 was encapsulated in the CCl4-mineralized product solid (mineralization at 513 K for 30 min). At higher mineralization temperatures (563-603 K), CuCl2 was found to be predominant on the surfaces of the mineralization product. Speciation of copper in the mineralization product solid was also studied by extended X-ray absorption fine structure (EXAFS) spectroscopy. Bond distances of Cu-O and Cu-Cl in the CCl4-mineralized product solid were 1.93-1.94 and 2.10-2.12 , respectively, which were greater than those of normal CuO and CuCl2 by 0.03-0.07 A. The increase of the bond distances for Cu-O and Cu-Cl might be due to Cl insertion and concomitant structural perturbation of unreacted CuO in the mineralization process. Forthe second shell around copper atom, bond distances of Cu-(O)-Cu also increased by 0.03-0.05 A, and the coordination numbers of Cu-O and Cu-(O)-Cu decreased, as expected, in the mineralization process. In addition, stoichiometrically excess oxygen atoms were found on the solid surfaces, and they might play an important role in the mineralization of CCl4, leading to the formation of CO2 and Cl. Chloride atoms might be further captured by CuO, yielding CuCl2 in the mineralization process. This work exemplifies the utilization of X-ray spectroscopies (XANES, EXAFS, and XPS) to reveal the speciation and possible reaction pathway in a very complex mineralization process in detail.
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Affiliation(s)
- Y C Chien
- Department of Environmental Engineering, National Cheng Kung University, Tainan, Taiwan
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Yang YW, Venkatesh S, Fan LJ, Dann TE, Lai LJ. NEXAFS study of 1-butanethiol adsorbed on Cu(111) and square root of 7 x square root of 7 R19.1 degrees S/Cu(111). J Synchrotron Radiat 2001; 8:1121-1123. [PMID: 11486365 DOI: 10.1107/s0909049500016782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2000] [Accepted: 06/01/2001] [Indexed: 05/23/2023]
Abstract
The adsorption of 1-butanethiol on Cu(111) and square root of 7 x square root of 7 R19.1 degrees S/Cu(111) surfaces has been studied by S K-edge near edge X-ray absorption fine structure (NEXAFS) spectroscopy and thermal desorption spectroscopy. Upon adsorption on clean Cu(111) surface at room temperature, butanethiolate as well as atomic sulfur is formed. For the butanethiolate, the S-C bond is found predominately perpendicular to the surface as revealed by polarization analysis. In contrast, on square root of 7 x square root of 7 R19.1 degrees S/Cu(111) surface, the S-H and S-C bonds of the butanethiol stay intact, resulting in a weakly chemisorbed butanethiol.
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Affiliation(s)
- Y W Yang
- Synchrotron Radiation Research Center, No 1, R&D Road, VI, Hsinchu, Taiwan 30077, R.O.C.
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Abstract
PURPOSE The purpose of this study was to evaluate glucose responsiveness in HepG2 human hepatoma cells transduced by a recombinant adeno-associated virus (rAAV) vector containing the insulin gene promoter. and to investigate the effect of protamine sulfate on rAAV-mediated gene delivery. METHODS Recombinant AAV vector, AAV.Ins.Luc.delta EGFP, was employed to transduce HepG2 hepatoma cells. Virus infection was carried out either in the absence or presence of protamine sulfate, followed by fluorescence microscopic examination, luciferase activity assay, and flow cytometric analysis. Electrokinetic measurements were carried out to determine the effect of protamine sulfate on zeta potential of the cells and the virus. RESULTS Glucose-responsive luciferase gene expression was obtained in rAAV-transduced HepG2 cells. Addition of 5 microg/ml protamine reversed the zeta potential of the cells and the virus particles, leading to enhanced transgene expression in rAAV-transduced HepG2 cells. Enhancement of protamine sulfate on rAAV-mediated gene transfer was dose-dependent. Addition of more than 5 microg/ml protamine resulted in a reduction of infectability of the virus. CONCLUSIONS Glucose responsiveness in the millimolar concentration range can be obtained in rAAV-transduced HepG2 cells. Protamine sulfate, up to 5 microg/ml, enhanced the rAAV transduction efficiency in HepG2 cells. The enhancement was correlated with zeta potential of the cells and the virus.
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Affiliation(s)
- Y W Yang
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei.
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36
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Abstract
Speciation of copper in the fly ash solidification process has been studied by X-ray based spectroscopies inthe present work. Fourier transformed EXAFS (extended X-ray absorption fine structural) spectra of the solidified fly ashes showed that the bond distance of Cu-O (first shell) was 1.96 A with a coordination number (CN) of about 3.0. However, in the second shell of copper atoms, the bond distance of Cu-(O)-Cu was decreased by 0.12-0.22 A during solidification, which might cause the stabilization of the CuO species in the solidified fly ash matrix. By the least-squares fits of the XANES (X-ray absorption near edge structural) spectra, fractions of the main copper species in the solidified fly ashes such as CuCl2 (0.08-0.11), Cu2O (0.07-0.09), Cu(OH)2 (0.31-0.33), and CuO (0.49-0.52) were observed. Combined EXAFS and XANES observations suggested that chemical reactions such as hydroxylation of CuCl2 and oxidation of Cu2O and/or metallic Cu might involve in the solidification process, which also led to a significant reduction of the leachability of copper from the solidified fly ashes.
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Affiliation(s)
- M C Hsiao
- Department of Environmental Engineering, National Cheng Kung University, Tainan City, Taiwan
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37
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Yang YW, Hsieh YC. Regulated secretion of proinsulin/insulin from human hepatoma cells transduced by recombinant adeno-associated virus. Biotechnol Appl Biochem 2001; 33:133-40. [PMID: 11277867 DOI: 10.1042/ba20000096] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
To employ hepatocytes as surrogate beta-cells for gene therapy of diabetes, a regulatory system was devised in this study by placing the human insulin cDNA under the control of the phosphoenolpyruvate carboxykinase (PEPCK) promoter, followed by the cytomegalovirus immediate early promoter-driven enhanced-green-fluorescent-protein open reading frame. The expression cassette was inserted into the adeno-associated virus vector between two inverted terminal repeats, and used to produce recombinant adeno-associated virus (rAAV). HepG2 human hepatoma cells were transduced by rAAV at the desired multiplicity of infection, followed by treatment with various concentrations of retinoic acid, dexamethasone, dibutyryl cAMP (dbcAMP) and 3-isobutyl-1-methylxanthine (IBMX). The cell-culture media were collected at 8, 16 and 24 h later. Proinsulin/insulin levels were determined with human proinsulin/insulin radioimmunoassay kits. Transduction of HepG2 cells by rAAV showed that green fluorescence was produced as early as 12 h after rAAV infection. Flow-cytometrical analysis demonstrated that transduction efficiency increased with the numbers of transducing rAAV particles used. The transduced hepatocytes were shown to secrete immunoreactive proinsulin/insulin, which were stimulated by the concentrations of retinoic acid, dexamethasone and dbcAMP in the culture medium. High conversion from proinsulin into insulin occurred when these cells were treated with dexamethasone and dbcAMP. The presence of IBMX enhanced the secretion of proinsulin/insulin from the dbcAMP-treated cells. We conclude that rAAV is a promising vector for gene therapy of diabetes. Regulated secretion of proinsulin/insulin can be obtained in the rAAV-transduced HepG2 cells conferred with the PEPCK promoter via rAAV-mediated gene transfer.
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Affiliation(s)
- Y W Yang
- School of Pharmacy, College of Medicine, National Taiwan University, 1, Jen-Ai Road, Section 1, Taipei 100, Taiwan.
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Hsiao MC, Wang HP, Huang YJ, Yang YW. EXAFS study of copper in waste incineration fly ashes. J Synchrotron Radiat 2001; 8:931-933. [PMID: 11512983 DOI: 10.1107/s0909049500020987] [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] [Received: 07/31/2000] [Accepted: 12/21/2000] [Indexed: 05/23/2023]
Abstract
Copper species such as CuCO3, Cu(OH)2, CuS and CuO were found in the bag house and EP (electrostatic precipitator) fly ashes of waste incineration processes by X-ray absorption near edge structural (XANES) spectroscopy. A small amount of Cu(I) and metallic Cu was found in the bag house fly ash. The averaged Cu-O bond distance in the fly ashes determined by EXAFS (extended X-ray absorption fine structural) was 1.96 A with coordination numbers of 2.4-3.9. However, the Cu-(O)-Cu (2nd shell) bond distance of the fly ashes in the incineration process was decreased by 0.19-0.21 A if compared to that of the CuO standard. The coordination numbers of the 2nd shell contribution to the bag house fly ash were not very significant.
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Affiliation(s)
- M C Hsiao
- Department of Environmental Engineering, National Cheng Kung University, Tainan, Taiwan, ROC
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Wei YL, Yang YW, Lee JF, Huang MY, Hsu LH. Chromium speciation in residues after sequential extraction of a thermally treated sludge analog. J Synchrotron Radiat 2001; 8:963-965. [PMID: 11512995 DOI: 10.1107/s0909049500020641] [Citation(s) in RCA: 2] [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] [Received: 07/31/2000] [Accepted: 12/19/2000] [Indexed: 05/23/2023]
Abstract
XANES fitting indicates that non-Cr2O3 form of Cr(III), transformed from CrO3 by four-hour heat application at 1100 degrees C, is the key species sorbed onto or lattice-diffused into kaolin matrices that exhibits strong leaching resistance to sequential extraction using various combined solutions including HNO3, H2O2, and HF. The EXAFS spectra are all in agreement with the XANES results. It is suggested that some Cr2O3 might have reacted with kaolin to form new compounds such as Cr2O3 x Al2O3 x 2SiO2 to account for the slight dissimilarity between the EXAFS spectra of samples and that of Cr2O3.
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Affiliation(s)
- Y L Wei
- Department of Environmental Science, Tunghai University, Taichung City, Taiwan.
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Liu SH, Wang HP, Wang HC, Yang YW. In-situ EXAFS study of copper in the electrokinetic remediation process. J Synchrotron Radiat 2001; 8:919-921. [PMID: 11512978 DOI: 10.1107/s0909049500020628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2000] [Accepted: 12/19/2000] [Indexed: 05/23/2023]
Abstract
The speciation of copper in the early stage of the electrokinetic remediation (EKR) process has been studied by extended X-ray absorption fine structure (EXAFS) spectroscopy in the present work. By in-situ EXAFS, we found that copper in a contaminated soil possessed a Cu-O bond distance of 1.98 A with a coordination number (CN) of 5.8. In the second shell, the bond distance of Cu-(O)-Cu was 2.87 A with a CN of 6.4. However, possibly due to the fact that incompact copper atoms in the outer shells were distorted by EKR, the Cu-(O)-Cu (2nd shell) bond distance and the CN of copper in the contaminated soil decreased by 0.08 A and 5.4, respectively in the early stage of the EKR process. Interestingly, after prolonging the contact time to about 80 minutes, the 1st-shell copper atoms were also perturbed by EKR. This work is an example of usefulness of the in-situ EXAFS spectroscopy for detailed studies of the speciation of copper in the contaminated soil during EKR process.
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Affiliation(s)
- S H Liu
- Department of Environmental Engineering, National Cheng Kung University, Tainan, Taiwan
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Wang HC, Wang HP, Peng CY, Liu SH, Yang YW. Speciation of As in the blackfoot disease endemic area. J Synchrotron Radiat 2001; 8:961-962. [PMID: 11512994 DOI: 10.1107/s090904950002063x] [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] [Received: 07/31/2000] [Accepted: 12/19/2000] [Indexed: 05/23/2023]
Abstract
Speciation of arsenic (As) in well water and contaminated soil in the blackfoot disease endemic area has been studied by extended X-ray absorption fine structural (EXAFS) spectroscopy in the present work. Experimentally, we found that arsenic in the well water possessed an As-O bond distance of 1.72 A with a coordination number (CN) of 4.3. In the blackfoot disease area, arsenic with a high oxidation state (As(V)) was also observed in the contaminated soil. In the early stage (after 90 minutes) of the electrokinetic remediation (EKR) of the contaminated soil, the in-situ EXAFS data indicated that the CN of As-O (1st shell) decreased slightly, that may be due to the perturbation of the incompact As atoms in the outer shells by EKR.
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Affiliation(s)
- H C Wang
- Department of Environmental Engineering, National Cheng Kung University, Tainan City, Taiwan.
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Abstract
Thermal immobilization of copper contaminants in soil analogue minerals, quartz and kaolin, at low temperatures such as 300 degrees C is studied to corroborate its technical feasibility as a method for soil remediation. We use a synchrotron-based, X-ray absorption spectroscopy (XAS) technique to study the speciation of and the local structure around copper in the soil analogues that are thermally treated at 300-900 degrees C for 1 h. The toxicity characteristic leaching procedure (TCLP) method is employed to investigate the leaching behavior of copper compounds. CuO, being predominately transformed from Cu(OH)2 with a lesser amount from Cu(NO3)2 by 1-h heat application at 300-900 degrees C, is identified by the spectroscopy of X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) as the key species that is leaching-resistant due to its low solubility and its chemisorption onto the soil analogue minerals. Fourier transform of EXAFS spectrum of the Cu-doped kaolin heated at 900 degrees C for 1 h indicates that the intensity of Cu-Cu peaks (2.50 and 5.48 A, both without phase shift correction) is either relatively smaller or disappearing as compared with that of kaolin samples heated at 300 and 500 degrees C. The EXAFS analysis suggests that the Cu solid phase in the 900 degrees C kaolin sample is different from the lower temperature samples, the 900 degrees C SiO2 sample, and the Cu standards. The leaching studies also support the formation of a less soluble phase in the 900 degrees C kaolin sample. An increase of heating temperature, in the range of 105-900 degrees C, reduces the Cu leaching percentage; this reduction trend is more marked for Cu-doped kaolin than for Cu-doped SiO2.
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Affiliation(s)
- Y L Wei
- Department of Environmental Science, Tunghai University, Taichung City, Taiwan, Republic of China.
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Abstract
PURPOSE Recent progress in genetic engineering presents the possibility of providing physiologically regulated glucose metabolism in individuals with diabetes. The objective of this study is to explore the feasibility of obtaining glucose dependent gene expression in the pancreatic beta-cell lines via recombinant adeno-associated virus type 2 (rAAV) mediated gene transfer. METHODS Two transcription cassettes containing the luciferase gene under the control of the rat insulin I gene promoter and the enhanced green fluorescent protein (EGFP) open reading frame under the control of the immediate early gene promoter of human cytomegalovirus (CMV) were placed in series between the inverted terminal repeats (ITRs) of AAV. The rAAV vectors produced were used to transduce pancreatic beta-cell line grown in the absence or presence of various concentrations of glucose. Luciferase activity assays were performed at 72 hr post-transduction. RESULTS Glucose-responsive reporter gene expression was obtained in both calcium phosphate transfected HIT-T15 and betaHC-9 cells, demonstrating regulated luciferase gene expression under control of the insulin gene promoter. At MOI of 100, rAAV-transduced betaHC-9 cells exhibited glucose-dependent luciferase activities, which were approximately 4.3 fold higher than those transfected by the calcium phosphate coprecipitation method at 20 mM glucose. CONCLUSIONS Delivery of the insulin gene promoter via rAAV was shown in this study to result in glucose-dependent control of the reporter gene expression. The results suggest that rAAV is an efficient viral vector for gene transfer into the pancreatic islet cells.
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Affiliation(s)
- Y W Yang
- School of Pharmacy, National Taiwan University, Taipei
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44
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Abstract
In this study we attempted to investigate the feasibility of transferring exogenous DNA into the recipient host via polyomavirus major capsid protein VP(1) pseudocapsids generated from recombinant Escherichia coli, designated PyVP(1,E), both in vitro and in vivo. NIH-3T3 and FR3T3 cells were transfected with pCMV beta and pPyMT-1 plasmid DNA, respectively. In vitro DNA transfection was carried out via Pseudofect- and PyVP(1,E)-mediated methods, or by co-precipitation with calcium phosphate. Expression of beta-galactosidase and PyMT reporter genes was examined by Western-blot analysis. Parallel experiments were performed in vivo by direct injection of pCMV beta and pPyMT-1 plasmid DNA, complexed with PyVP(1,E), into the livers of Wistar rats, followed by Western-blot analysis and histochemical staining. The results obtained from in vitro transfection experiments showed that expression of the reporter genes can be detected in the recipient cells at 48 h post-transfection. PyVP(1,E) was shown to exhibit similarly efficient in vitro DNA transfection properties to Pseudofect, which was obtained from recombinant baculovirus.
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Affiliation(s)
- Y W Yang
- School of Pharmacy, College of Medicine, National Taiwan University, 1, Jen-Ai Road, Section 1, Taipei 100,
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45
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Abstract
Behavior of Br in pyrolysis of the printed circuit board waste with valuable copper and oil recycling has been studied in the present work. Experimentally, pyrolysis of the printed circuit board waste generated approximately 40.6% of oils, 24.9% of noncondensible gases and 34.5% of solid residues that enriched in copper (90-95%). The cuts of the oils produced from pyrolysis of the printed circuit board waste into weighted boiling fraction were primarily light naphtha and heavy gas oil. Approximately 72.3% of total Br in the printed circuit board waste were found in product gas mainly as HBr and bromobenzene. However, by extended X-ray absorption fine structural (EXAFS) spectroscopy, Cu-O and Cu-(O)-Cu species with bond distance of 1.87 and 2.95 A, respectively, were observed in the solid residues. Essentially, no Cu-Br species was found.
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Affiliation(s)
- Y C Chien
- Department of Environmental Engineering, Cheng Kung University, Tainan, Taiwan, ROC
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46
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Yang YW, Lai KN, Tai PY, Ma DP, Li WH. Molecular phylogenetic studies of Brassica, rorippa, arabidopsis and allied genera based on the internal transcribed spacer region of 18S-25S rDNA. Mol Phylogenet Evol 1999; 13:455-62. [PMID: 10620403 DOI: 10.1006/mpev.1999.0648] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The phylogenetic relationships of nine genera in four tribes of the family Brassicaceae were estimated from the sequences of the internal transcribed spacer region (ITS) of the 18S-25S nuclear ribosomal DNA. The entire ITS region of 16 accessions belonging to 10 species of seven genera was sequenced. Eight published sequences of Brassicaceae were also used. A total of 27 sequences were included in this study; four of them were found to be pseudogenes. Both the neighbor-joining and the parsimony trees suggest that the nine genera can be divided into three groups: (1) Arabidopsis, Cardaminopsis, Capsella, and Lepidium; (2) Rorippa and Cardamine; and (3) Brassica, Sinapis, and Raphanus. In contradiction to the proposal that Cardaminopsis and Arabidopsis be put into an expanded tribe Arabideae, our data show that these two genera are more closely related to Capsella and Lepidium (tribe Lepidieae) than to Rorippa and Cardamine (tribe Arabideae). Further, our data show that within the tribe Brassiceae, Raphanus is more closely related to B. nigra than to the B. oleracea/B. rapa clade. This result is in agreement with the nuclear data obtained in several studies, but is in conflict with the RFLP data of mitochondrial and chloroplast DNA. As pointed out by previous authors, it is possible that Raphanus is a hybrid between the B. nigra and B. oleracea/B. rapa lineages with the latter as the maternal parent.
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Affiliation(s)
- Y W Yang
- Institute of Botany, Academia Sinica, Taipei, Taiwan, 11529.
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47
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Yang YW, Lai KN, Tai PY, Li WH. Rates of nucleotide substitution in angiosperm mitochondrial DNA sequences and dates of divergence between Brassica and other angiosperm lineages. J Mol Evol 1999; 48:597-604. [PMID: 10198125 DOI: 10.1007/pl00006502] [Citation(s) in RCA: 250] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We obtained 16 nucleotide sequences ( approximately 1400 bp each) of the first intron of the mitochondrial (mt) gene for NADH subunit 4 (nad4) from 10 species of Brassicaceae. Using these new sequences and five published sequences from GenBank, we constructed a phylogenetic tree of the Brassicaceae species under study and showed that the rate of nucleotide substitution in the first intron of nad4 is very low, about 0.16-0.23 x 10(-9) substitution per site per year, which is about half of the silent rate in exons of nad4. The ratios of substitution rates in this intron, ITS, and IGS are approximately 1:23:73, where ITS is the nuclear intergenic spacer between 18S and 25S rRNA genes and IGS is the intergenic spacer of 5S rRNA genes. A segment (335 bp) in the first intron of nad4 in Brassicaceae species that is absent in wheat was considered as a nonfunctional sequence and used to estimate the neutral rate (the rate of mutation) in mtDNA to be 0.5-0.7 x 10(-9) substitution per site per year, which is about three times higher than the substitution rate in the rest of the first intron of nad4. We estimated that the dates of divergence are 170-235 million years (Myr) for the monocot-dicot split, 112-156 Myr for the Brassicaceae-Lettuce split, 14.5-20.4 Myr for the Brassica-Arabidopsis split, and 14.5-20.4 Myr for the Arabidopsis-Arabideae split.
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Affiliation(s)
- Y W Yang
- Institute of Botany, Academia Sinica, Taipei, Taiwan 11529.
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48
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Abstract
Conformations of polyomavirus (Py) major capsid protein VP1 were analyzed by circular dichroism (CD) and fluorescence spectroscopy in the presence of sodium dodecyl sulfate (SDS). Binding of PyVP1 to SDS induced marked conformational changes of PyVP1, which were reflected on the CD and fluorescence spectra. Abrupt changes in both optical properties occurred within the narrow ranges of SDS concentrations with the transition midpoints closely related to SDS micelle formation. Analysis of circular dichroism spectra showed that the contents of alpha-helices, beta-sheets, beta-turns and random coils in PyVP1 varied upon addition of SDS, demonstrating the exquisite sensitivity of the conformations of the protein to the environment. The interactions of PyVP1 with SDS were shown to be dependent on the ionic strength of the protein solution, suggesting that both hydrophobic and electrostatic forces contribute to the PyVP1-SDS complex formation. The SDS-induced conformational changes of PyVP1 appeared to be a two-stage process.
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Affiliation(s)
- Y W Yang
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei.
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49
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Abstract
Based on the electrical properties of the skin, a method employing the unijunction transistor (UJT) relaxation oscillator for detecting low skin resistance points (LSRP) was developed in this study. By means of this instrumentation, the topography of the LSRP in Wistar rats was developed. All the LSRP in the rats were found to be bilaterally and symmetrically distributed except those points located on the dorsal midline (i.e., governor vessel, GV) and the ventral midline (i.e., conception vessel, CV). The resistances of the LSRP on these two major vessels, including 14 CV points and 17 GV points of six rats were experimentally determined to be in the ranges of 179.4 +/- 41.2 K omega and 152.5 +/- 32.2 K omega, respectively. The resistances of the GV points were found in general to be lower than those of the CV points. Most non-LSRP, on the other hand, exhibited resistances of greater than 420 K omega. It is noted that the resistances of most LSRP increased yet still retained a separate identity within thirty minutes after the death of the animals, but the low resistance properties of some LSRP gradually disappeared thereafter and could not be detected by the relaxation oscillator.
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Affiliation(s)
- S Y Chiou
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei
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50
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Abstract
The guanidine hydrochloride (GdnHCl)- and urea-induced equilibrium denaturation of recombinant polyomavirus (Py) major capsid protein VP1 was studied by circular dichroism and fluorescence spectroscopy. Both secondary and tertiary structures of PyVP1 were shown to be disrupted in the presence of denaturants. Although the far-UV circular dichroism (CD) spectra of PyVP1 in the denaturants exhibit similar two-phase transition as those obtained from the fluorescence measurements, the unfolding of PyVP1 in GdnHCl was shown to be more complex than a similar two-state mechanism. The presence of unfolding intermediates is manifested by the noncoincidence of transitions when detected by different probes. The unfolding intermediate appeared to be stabilized by 1 M NaCl. Addition of Ca2+ and 2-mercaptoethanol does not show significant effect on the conformational stability of PyVP1. Unfolding of PyVP1 in GdnHCl was shown to be an irreversible process.
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Affiliation(s)
- Y W Yang
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei, ROC
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