维普中文期刊产品整合服务
9116篇 您的检索式:作者名="Han L"
    题名 作者 年代 出处 被引量
1Osteoarthritis:toward a comprehensive understanding of pathological mechanism显示文摘Osteoarthritis(OA) is the most common degenerative joint disease and a major cause of pain and disability in adult individuals. The etiology of OA includes joint injury, obesity, aging, and heredity. However, the detailed molecular mechanisms of OA initiation and progression remain poorly understood and, currently,there are no interventions available to restore degraded cartilage or decelerate disease progression. The diathrodial joint is a complicated organ and its function is to bear weight, perform physical activity and exhibit a joint-specific range of motion during movement. During OA development, the entire joint organ is affected, including articular cartilage, subchondral bone, synovial tissue and meniscus. A full understanding of the pathological mechanism of OA development relies on the discovery of the interplaying mechanisms among different OA symptoms, including articular cartilage degradation, osteophyte formation, subchondral sclerosis and synovial hyperplasia, and the signaling pathway(s) controlling these pathological processes.Di Chen Jie Shen Weiwei Zhao Tingyu Wang Lin Han John L Hamilton Hee-Jeong Im 2017Bone Research2017,5,1:121
2A complete sequence and comparative analysis of a SARS-associated virus(Isolate BJ01)显示文摘The genome sequence of the Severe Acute Respiratory Syndrome (SARS)-associated virus provides essential information for the identification of pathogen(s), exploration of etiology and evolution, interpretation of transmission and pathogenesis, development of diagnostics, prevention by future vaccination, and treatment by developing new drugs. We report the complete genome sequence and comparative analysis of an isolate (BJ01) of the coronavirus that has been recognized as a pathogen for SARS. The genome is 29725 nt in size and has 11 ORFs (Open Reading Frames). It is composed of a stable region encoding an RNA-dependent RNA polymerase (composed of 2 ORFs) and a variable region representing 4 CDSs (coding sequences) for viral structural genes (the S, E, M, N proteins) and 5 PUPs (putative uncharacterized proteins). Its gene order is identical to that of other known coronaviruses. The sequence alignment with all known RNA viruses places this virus as a member in the family of Coronaviridae. Thirty putative substitutions have been identified by comparative analysis of the 5 SARS- associated virus genome sequences in GenBank. Fifteen of them lead to possible amino acid changes (non-synonymous mutations) in the proteins. Three amino acid changes, with predicted alteration of physical and chemical features, have been detected in the S protein that is postulated to beinvolved in the immunoreactions between the virus and its host. Two amino acid changes have been detected in the Mprotein, which could be related to viral envelope formation. Phylogenetic analysis suggests the possibility of non-human origin of the SARS-associated viruses but provides noevidence that they are man-made. Further efforts should focus on identifying the etiology of the SARS-associated virus and ruling out conclusively the existence of otherpossible SARS-related pathogen(s).QIN E'de ZHU Qingyu YU Man FAN Baochang CHANG Guohui SI Bingyin YANG Bao PENG Wenming JIANG Tao LIU Bohua DENG Yongqiang LIU Hong ZHANG Yu WANG Cui LI Yuquan GAN Yonghua LI Xiaoyu L Fushuang TAN Gang CAO Wuchun, YANG Ruifu Institute of Microbiology and Epidemiology, Chinese Academy of Military Medical Sciences, Beijing 100071, China WANG Jian, LI Wei, XU Zuyuan, LI Yan, WU Qingfa, LIN Wei, CHEN Weijun, TANG Lin, DENG Yajun, HAN Yujun, LI Changfeng, LEI Meng, LI Guoqing, LI Wenjie, L Hong, SHI Jianping, TONG Zongzhong, ZHANG Feng, LI Songgang, LIU Bin, LIU Siqi, DONG Wei, WANG Jun, Gane K-S Wong, YU Jun & YANG Huanming* Beijing Genomics Institute, Chinese Academy of Sciences, Beijing 101300 National Center for Genome Information, Beijing 101300, China 2003Chinese Science Bulletin2003,48,10:121
3Clinical Features of Adult/Adolescent Atopic Dermatitis and Chinese Criteria for Atopic Dermatitis显示文摘Ping Liu Yan Zhao Zhang-Lei Mu Qian-Jin Lu Qian-Jin L U Li Zhang Xu Yao Min Zheng Yi-Wen Tang Xin-Xiano Lu Xiu-Juan xia You-Kun Lin Yu-Zhen Li Cai-Xia Tu Zhi-Rong Yao Jin-Hua Xu Wei Li Wei Lai Hui-Min Yang Hong-Fu Xie Xiu-Ping Han Zhi-Qiang Xie Xiang Nong Zai-Pei Guo Dan-Qi Deng Tong-Xin Shi Jian-Zhong Zhang 2016Chinese Medical Journal2016,,7:64
4Multiple genetic alterations and behavior of cellular biology in gastric cancer and other gastric mucosal lesions:H.pylori infection,histological types and staging显示文摘AIM To investigate the expression of multiplegenes and the behavior of cellular biology ingastric cancer(GC)and other gastric mucosallesions and their relations to Helicobacter pylori(H.pylori)infection,tumor staging andhistological subtypes.METHODS Three hundred and twenty-sevenspecimens of gastric mucosa obtained viaendoscopy or surgical resection,and ABCimmunohistochemical staining were used todetect the expression of p53,p16,Bcl-2 andCOX-2 proteins.H.pylori was determined byrapid urea test combined with pathologicalstaining or14C urea breath test.Cellular image analysis was performed in 66 patients withintestinal metaplasia(IM)and/or dysplasia(Dys).In 30 of them,both cancer and theparacancerous tissues were obtained at the timeof surgery.Histological pattern,tumor staging,lymph node metastasis,grading ofdifferentiation and other clinical data werestudied in the medical records.RESULTS p16 expression of IM or Dys wassignificantly lower in positive H.pylori chronicatrophic gastritis(CAG)than those withnegative H.pylori(CAG:54.8% vs 88.0%,IM:34.4% vs 69.6%,Dys:23.8% vs 53.6%,allP<0.05),Bcl-2 or COX-2 expression of IM orDys in positive H.pylori cases was significantlyhigher than that without H.pylori(Bcl-2:68.8%vs23.9%,90.5% vs 60.7%;COX-2:50.0% vs10.8%,61.8% vs 17.8%;all P<0.05).Themean number of most parameters of cellularimage analysis in positive H.pylori group wassignificantly higher than that in negative H.pylori group(Ellipser:53±14,40±12μm,Area1:748±572,302±202 μm2,Area2:3050±1661,1681±1990 μm2,all P<0.05;Ellipseb:79±23,58±15 μm,Ratio1:22%±5%,13%±4%,Ratio2:79%±17%,53%±20%,all P<0.01).There was significant correlation between Bcl-2and histologic pattern of gastric carcinoma,andbetween COX-2 and tumor staging or lymph nodemetastasis(Bcl-2:75.0% vs 16.7%;COX-2:76.0% vs 20.0%,79.2% vs 16.7%;allP<0.05).CONCLUSION p1l6, Bcl-2, and COX-2 but not p53 gene may play a role in the early genesis/ progression of gastric carcinoma and are associated with H. pylori infection. p53 gene is relatively late event in gastric tumorigenesis and mainly relates to its progression. There is more cellular-biological behavior of malignant tumor in gastric mucosal lesions with H. pylori infection. Aberrant Bcl-2 protein expression appears to be preferentially associated with the intestinal type cancer. COX-2 seems to be related to tumor staging and lymph node metastasis.Heng Jun Gao Lian Zhen Yu Jian Feng Bai Yan Shen Peng Gu Sun Han Lin Zhao Kun Miu Xiu Zhen Lü Xiao Yong Zhang Zhi Quan Zhao 2000World Journal of Gastroenterology2000,6,6:52
5Antiviral therapy and resistance with hepatitis B virus infection显示文摘Hepatitis B virus (HBV) infection is still the most com- mon cause of hepatocellular carcinoma and liver cirrho- sis world wide. Recently, however, there has been quite dramatic improvement in the understanding of HBV as- sociated liver disease and its treatment. It has become clear that high viral replication is a major risk factor for the development of both cirrhosis and hepatocellular carcinoma. Early studies have shown lamivudine low- ers the risk of HBV associated complications. There are currently three nucleos(t)ides licensed, in addition to interferon, and there are more drugs coming to the mar- ket soon. Interferon or its pegylated counterpart are still the only options for treatment with defined end points, while nucleos(t)ides therapy is used mostly for long term treatment. Combination therapies have not been shown to be superior to monotherapy in na?ve patients, how- ever, the outcome depends on how the end point is de- fined. Interferon plus lamivudine achieves a higher viral suppression than either treatment alone, even though Hbe-seroconversion was not different after a one year treatment. HBV-genotypes emerge as relevant factors, with genotypes 'A' and 'B' responding relatively well to interferon, achieving up to 20% HBsAg clearance in the case of genotype 'A'. In addition to having a defined treatment duration, interferon has the advantage of lack- ing resistance selection, which is a major drawback for lamivudine and the other nucleos(t)ides. The emergence of resistance against adefovir and entecavir is some- what slower in na?ve compared to lamivudine resistant patients. Adefovir has a low resistance profile with 3%, 9%, 18%, and 28% after 2, 3, 4, and 5 years, respec- tively, while entecavir has rarely produced resistance in na?ve patients for up to 3 years.Hans L Tillmann 2007World Journal of Gastroenterology2007,13,1:45
6美国临床生化科学院检验医学实践指南:睾丸、前列腺、结直肠、乳腺及卵巢癌肿瘤标志物的应用显示文摘经美国临床生化科学院(NCAB)授权,由鄢盛恺教授组织学者、专家翻译审定2009年NCAB检验医学实践指南:睾丸、前列腺、结直肠、乳腺及卵巢癌中肿瘤标志物的应用单行本(Catharine M.Sturgeon教授和Eleftherios P.Diaman-dis教授编辑)。该指南包含第1至6章共6部分内容,参加指南制订的专家阵容强大,分别从临床及检验角度对睾丸、前列腺、结直肠、乳腺及卵巢癌中肿瘤标志物的检测与临床应用方面的问题进行了详细阐述与说明,是目前国内外在肿瘤实验诊断方面的纲领性应用文件。不仅适合广大检验人员、临床医护人员学习使用,也非常适合相关仪器试剂生产厂商研发应用。本指南由刘洋、薛丽、林文涛、李江、梁红艳、顾兵、潘世扬、郑磊等翻译,姜晓峰、沈文梅、田亚平、鄢盛恺审校,最后由鄢盛恺统稿审定。本指南的翻译出版,不仅有助于我国检验人员和医护人员合理的检测和应用睾丸、前列腺、结直肠、乳腺及卵巢癌肿瘤标志物,对我国检验医学指南的编写与应用也有一定的借鉴作用。本刊特在本期刊发,以飨广大读者。鄢盛恺 Ulf-Hkan Stenman Rolf Lamerz Leendert H.Looijenga Nils Brünner Michael J.Duffy Caj Haglund Mads Holten-Andersen Hans JФrgen Nielsen Francisco J.Esteva Nadia Harbeck Daniel F.Hayes Rafael Molina Daniel W.Chan Robert C.Bast Jr Ie-Ming Shih Lori J.Sokoll Gyrgy Slétormos 刘洋 梁红艳 姜晓峰 田亚平 薛丽 林文涛 顾兵 潘世扬 沈文梅 郑磊 李江 2012临床检验杂志2012,30,2:32
7TAF和TDF上调NS5ATP9,汇集调控TGFβ1/Smad3、NF-κB/NLRP3炎性小体信号通路,抑制肝纤维化显示文摘【据《Hepatol Int》2020年1月报道】题:TAF和TDF上调NS5ATP9,汇集调控TGFβ1/Smad3、NF-κB/NLRP3炎性小体信号通路,抑制肝纤维化(作者ZHAO J等)来自北京地坛医院的zhao等进行了一项研究,旨在探讨替诺福韦阿芬太尼富马酸替诺福韦(TAF)/替诺福韦富马酸二异丙酚(TDF)在治疗肝纤维化中的作用和机制。首先研究了TAF/TDF对四氯化碳诱导的C57BL/6野生型或HCV非结构蛋白5A反式激活蛋白9(NS5ATP9)基因敲除小鼠肝纤维化及肝脏炎症的治疗作用。其次,体外实验检测了TAF/TDF对肝星状细胞分化、激活、增殖的影响。赵静 成军 ZHAO J HAN M ZHOU L 2020临床肝胆病杂志2020,36,3:15
8Millennial-scale climate change since the last glaciation recorded by grain sizes of loess deposits on the northeastern Tibetan Plateau显示文摘Whether climatic changes in high latitudes of the Northern Hemisphere since the last glaciation have effects on the Tibetan Plateau monsoon, and the variation characteristics of the Plateau monsoon itself are still not solved but of great significance. The 22-m high-resolution Ioess-paleosol sequence in the Hezuo Basin on the northeastern Tibetan Plateau demonstrates that the Plateau winter monsoon experienced a millennial variation similar to high latitude Northern Hemisphere, with cold events clearly correlated with Heinrich events but less for the warm events (Dansgarrd-Oeschger events). It may indicate that the climate system at high latitudes in the Northern Hemisphere had played an important role in both the Plateau monsoon and the high-level westerlies. On 10^4 year scale, there are two distinct anomalous changes, which are not found in the records from high latitude northern hemisphere, revealed by the loess grain size in the Hezuo Basin. One is that there was a considerable grain size increase at -36 kaBP, suggesting an abrupt enhancement of the Plateau winter monsoon at that time; the other is that, during 43--36 kaBP, the grain size decreased distinctly, indicating a notable weakening of the Plateau winter monsoon around that period. Both of the two anomalies suggest that the Tibetan climate may have been controlled by some other factors, besides the high latitude climatic changes in the Northern Hemisphere.Lü Lianqing FANG Xiaomin LU Huayu HAN Yongxiang YANG Shengli LI Jijun AN Zhisheng 2004Chinese Science Bulletin2004,49,11:13
9运用PTEN和ERG免疫染色区分针吸活检组织中前列腺导管内癌以及高级别PIN显示文摘前列腺导管内癌和高级别上皮内瘤变(PIN)在治疗方案上有着显著的区别,但二者的针吸活检组织很难区分。在前列腺根治标本中,作者发现运用PTEN和ERG的免疫组化染色可以解决这一难题。作者在实验中进一步验证在针吸标本中这些标志物是否有用。单独或组合的免疫标记法运用于形态学明确的导管内癌、PIN、交界性导管内增生的活检,后者缺乏类似于导管内癌的形态学准则而比PIN更令人担忧。Morais C L Han J S Gordetsky J 徐磊 孙咏梅 2015临床与实验病理学杂志2015,31,4:11
10Excretion of Four Catechins in Tea Polyphenols in Rats显示文摘Objective To investigate excretion profiles of the four major anti-oxidant active catechins, (-) epigallo-catechin-3-gallate (EGCG), (-) epicatechin-3-gallate (ECG), (-) epigallocatechin (EGC), and epicatechin (EC) in tea polyphenols (TP) in rats in order to provide experimental data for clinical uses and development of TP as a novel drug. Methods The above four catechins in urine, bile, and feces were simultaneously determined by high performance liquid chromatography coupled with ultraviolet absorption detector (HPLC-UV) assay with a binary gradient elution. The samples were extracted by ethyl acetate prior to HPLC. The quantification was carried out by peak area internal standard method. Following iv dosing TP 100 mg/kg to rats, the samples were collected at different time intervals up to 8 h (urine and bile) and 24 h (feces). Results The urinary Ae, 0-8 h (cumulative excretion amount over 8 h) of EGCG, ECG, EGC, and EC were, on the average, 150.83, 30.75, 116.69, and 254.56 μg, corresponding to fe, 0-8 h (cumulative excretion fraction of dose over 8 h) of 1.45%, 0.84%, 7.88%, and 10.73%, respectively; the biliary Ae, 0-8 h were 12.61, 42.64, 6.61, and 1.24 μg, corresponding to the fe, 0-8 h of 0.12%, 1.16%, 0.45%, and 0.053%,respectively. For fecal excretion, only EGCG and EGC were detected with Ae, 0-24 h of 7.38 μg (fe, 0-24 h of 0.07%) and 157 μg (fe, 0-24 h of 9.99 %), respectively. The fe, total (the total fe of 3 excretory routes) were 18.32%, 10.78%, 2.00%, and 1.64% for EGC, EC, ECG, and EGCG, respectively. Conclusion EGCG and EC are mainly excreted in urine, ECG in bile, and EGC in feces by reference to their Ae and fe. The excretion of the four catechins based on fe, total is ranked in order of EGC > EC > ECG > EGCG. Only small amount of four catechins are recovered in urine, bile, and feces, indicating an extensive metabolic conversion of catechins in the rat body.LI Qiu-sha1, ZOU Ling-li1, FU Ting1, HAN Guo-zhu1, L Li1, ZHOU Qin1, LIN Ya-fang1, LI Nan2 1. Department of Clinical Pharmacology, Dalian Medical University, Dalian 116044, China 2. Department of Analytical Chemistry, Dalian University of Science & Technology, Dalian 116023, China 2009Chinese Herbal Medicines2009,1,1:10
11曹雪涛院士科研团队论文荣膺中国百篇最具影响国际学术论文--长链非编码RNA1nc-DC通过STAT3调控人DC的分化和功能显示文摘树突状细胞(DC)是免疫系统中重要的抗原提呈细胞,其成熟和功能状态决定着免疫应答的走向和强度。哺乳动物基因组能够转录产生大量的长链非编码RNA(long noncoding RNA,IncRNA),其在免疫系统中的功能还知之甚少。 曹雪涛院十科研团队王品副教授课题组采用了转录组芯片二代测序高通量筛选方法、RNA-pulldown、ChIP-seq等技术展开了对IncRNA在DC分化和功能中作用的研究,发现并鉴定了特异性高表达于DC的1ncRNA,命名为1nc-DC,其可通过抑制STAT3去磷酸化,从而促进DC分化和功能。该研究成果发表于Science杂志[2014,344(6181):310-313],并于2015年12月被评为“中国百篇最具影响国际学术论文”。wang p xue y han y lin l wu c xu s jiang z xu j liu q cao x 2016中国肿瘤生物治疗杂志2016,23,1:10
12血管紧张素转换酶抑制剂和血管紧张素受体拮抗剂的使用与2019冠状病毒疾病检测阳性之间的关系显示文摘血管紧张素转换酶抑制剂(angiotensin-converting enzyme inhibitor,ACEI)和血管紧张素受体拮抗剂(angiotensin receptor blocker,ARB)在2019新型冠状病毒疾病(coronavirus disease 2019,COVID-19)全球大流行背景下的作用备受争议。此类药物是治疗一些慢性病的必须药物,有建议停止使用这些药物.Mehta N KalraA Nowacki AS Anjewierden S Han Z Bhat p Rubio AEC Jacob M Procop GW Harrington S Milinovich A Svensson LG Jehi L Young JB Chung MK 周卫(译) 叶鹏(校) 2020中华高血压杂志2020,28,5:9
13Dietary and metabolomic determinants of relapse in ulcerative colitis patients: A pilot prospective cohort study显示文摘AIM To identify demographic, clinical, metabolomic, and lifestyle related predictors of relapse in adult ulcerative colitis(UC) patients.METHODS In this prospective pilot study, UC patients in clinical remission were recruited and followed-up at 12 mo to assess a clinical relapse, or not. At baseline information on demographic and clinical parameters was collected. Serum and urine samples were collected for analysis of metabolomic assays using a combined direct infusion/liquid chromatography tandem mass spectrometry and nuclear magnetic resolution spectroscopy. Stool samples were also collected to measure fecal calprotectin(FCP). Dietary assessment was performed using a validated self-administered food frequency questionnaire. RESULTS Twenty patients were included(mean age: 42.7 ± 14.8 years, females: 55%). Seven patients(35%) experienced a clinical relapse during the follow-up period. While 6 patients(66.7%) with normal body weight developed a clinical relapse, 1 UC patient(9.1%) who was overweight/obese relapsed during the follow-up(P = 0.02). At baseline, poultry intake was significantly higher in patients who were still in remission during follow-up(0.9 oz vs 0.2 oz, P = 0.002). Five patients(71.4%) with FCP > 150 μg/g and 2 patients(15.4%) with normal FCP(≤ 150 μg/g) at baseline relapsed during the follow-up(P = 0.02). Interestingly, baseline urinary and serum metabolomic profiling of UC patients with or without clinical relapse within 12 mo showed a significant difference. The most important metabolites that were responsible for this discrimination were trans-aconitate, cystine and acetamide in urine, and 3-hydroxybutyrate, acetoacetate and acetone in serum. CONCLUSION A combination of baseline dietary intake, fecal calprotectin, and metabolomic factors are associated with risk of UC clinical relapse within 12 mo.Ammar Hassanzadeh Keshtel iFloris F van den Brand Karen L Madsen Rupasri Mandal Rosica ValchevaKaren I Kroeker Beomsoo Han Rhonda C Bell Janis Cole Thomas Hoevers David S Wishart Richard N Fedorak Levinus A Dieleman 2017World Journal of Gastroenterology2017,23,21:9
14华北克拉通西部陆块北缘新生代岩石圈地幔特征的初步研究显示文摘凉城、四子王旗、三义堂和大同的地幔包体的岩石学和矿物的主、微量元素成分显示华北克拉通中、西部北缘总体为过渡型岩石圈地幔,为原始地幔经过不同程度的熔体抽取和后期交代富集作用的残留。凉城岩石圈地幔经历的熔体抽取程度最低,后期交代富集作用比较强烈,这与其橄榄岩中尖晶石的Cr#较低,并且共存的单斜辉石的Mg#较低一致。三义堂岩石圈地幔经历的熔体抽取程度最高,后期交代富集作用最强烈,不同样品甚至同一样品中不同单斜辉石颗粒的La/Yb和LREE配分模式变化范围非常大,且矿物边部比核部更富集微量元素。大同、四子王旗岩石圈地幔经历的熔体抽取程度介于凉城和三义堂之间,但后期的交代富集作用明显不如凉城和三义堂强烈。研究区的岩石圈地幔主要受硅酸盐熔体交代作用的影响,只有三义堂岩石圈地幔还可能也受到了碳酸盐交代作用的影响。王亚妹 William L GRIFFIN 韩宝福 WANG YaMei HAN BaoFu 2011岩石学报2011,27,10:9
15Allogeneic Vγ9Vδ2 T-cell immunotherapy exhibits promising clinical safety and prolongs the survival of patients with late-stage lung or liver cancer显示文摘Vγ9Vδ2 T cells are promising candidates for cellular tumor immunotherapy.Due to their HLA-independent mode of action,allogeneic Vγ9Vδ2 T cells can be considered for clinical application.To apply allogeneic Vγ9Vδ2 T cells in adoptive immunotherapy,the methodology used to obtain adequate cell numbers with optimal effector function in vitro needs to be optimized,and clinical safety and efficacy also need to be proven.Therefore,we developed a novel formula to improve the expansion of peripheralγδT cells from healthy donors.Then,we used a humanized mouse model to validate the therapeutic efficacy of expandedγδT cells in vivo;furthermore,the expandedγδT cells were adoptively transferred into late-stage liver and lung cancer patients.We found that the expanded cells possessed significantly improved immune effector functions,including proliferation,differentiation,and cancer cell killing,both in vitro and in the humanized mouse model.Furthermore,a phase I clinical trial in 132 late-stage cancer patients with a total of 414 cell infusions unequivocally validated the clinical safety of allogeneic Vγ9Vδ2 T cells.Among these 132 patients,8 liver cancer patients and 10 lung cancer patients who received≥5 cell infusions showed greatly prolonged survival,which preliminarily verified the efficacy of allogeneic Vγ9Vδ2 T-cell therapy.Our clinical studies underscore the safety and efficacy of allogeneic Vγ9Vδ2 T-cell immunotherapy,which will inspire further clinical investigations and eventually benefit cancer patients.Yan Xu Zheng Xiang Mohammed Alnaggar Léonce Kouakanou Jiawei Li Junyi He Jiashuang Yang Yi Hu Yan Chen Li Lin Jianlei Hao Jingxia Li Jibing Chen Man Li Qingling Wu Christian Peters Qinghua Zhou Jianshuang Li Yingqing Liang Xiaohua Wang Baohui Han Meili Ma Dieter Kabelitz Kecheng Xu Wenwei Tu Yangzhe Wu Zhinan Yin 2021Cellular & Molecular Immunology2021,18,2:8
16大塑性变形6013铝合金的时效特性与力学性能(英文)显示文摘利用X射线衍射分析(XRD)、差示扫描量热法(DSC)和拉伸试验,研究不同温度等通道转角挤压(ECAP)和常规静态时效处理后6013 Al-Mg-Si铝合金的微观结构、时效行为、析出动力学以及力学性能。XRD测得的ECAP变形后合金的平均晶粒尺寸在66-112 nm范围内,平均位错密度在1.20×10^14-1.70×10^14 m^-2范围内。DSC分析表明,由于ECAP后试样比常规时效处理试样拥有更细小的晶粒和更高的位错密度,因此,ECAP变形后合金的析出动力学更快。与未变形合金相比,ECAP后试样的屈服强度和抗拉强度都得到了显著提高。室温ECAP后试样的强度达到最大,其屈服强度是静态峰时效屈服强度的1.6倍。细晶强化、位错强化以及由于ECAP过程中的动态析出而产生的析出相强化,是ECAP合金获得高强度的几种主要强化机制。刘满平 蒋婷慧 王俊 刘强 吴振杰 Ying-da YU Pl C.SKARET Hans J.ROVEN 2014Transactions of Nonferrous Metals Society of China2014,24,12:8
17Superior grains determined by grain weight are not fully correlated with the flowering order in rice显示文摘Rice panicles are composed of many branches with two types of extreme grains,the superior and the inferior.Traditionally,it has been well accepted that earlier flowers result in superior grains and late flowers generate inferior grains.However,these correlations have never been strictly examined in practice.In order to determine the accurate relationship between superior and inferior grains and the flowering order,we localized all the seeds in a panicle in four distinct rice species and systematically documented the rice flowering order,flower locations and the final grain weight for their relationships.Our results demonstrated that the grain weight is more heavily determined by the position of the seeds than by the flowering order.Despite earlier flowering has a positive correlation with the grain weight in general,grains from flowers blooming on the second day after anthesis generally gained the highest weight.This suggests earlier flowers may not result in superior grains.Therefore,we concluded that superior and inferior grains,commonly determined by grain weight,are not fully correlated with the flowering order in rice.Following the order of the grain weight,the superior grains are generally localized at the middle parts of the primary branches,whereas inferior grains were mainly on the last two secondary branches of the lower half part of the panicle.In addition,the weight of inferior grains were affected by spikelet thinning and spraying with exogenous plant growth regulators,indicating that physiological incompetence might be the major reason for the occurrence of the inferior grains.PENG Ting L Qiang ZHAO Ya-fan SUN Hong-zheng HAN Ying-chun DU Yan-xiu ZHANG Jing LI Jun-zhou WANG Lin-lin ZHAO Quan-zhi 2015Journal of Integrative Agriculture2015,14,5:7
18大气二氧化氮与每日总死亡率、心血管和呼吸系统疾病死亡率的短期关联:398个城市的多中心分析显示文摘目的:采用统一的分析方案,评估全球多个国家/地区的二氧化氮(NO_(2))与总死亡率、心血管和呼吸系统疾病死亡率之间的短期关联。研究设计:采用两阶段的时间序列分析方法、过度离散的广义线性模型和多水平meta分析。研究地点:22个低到高收入国家/地区的398个城市。主要结局指标:1973—2018年逐日总死亡人数(6280万人)、心血管疾病死亡人数(1970万人)和呼吸系统疾病死亡人数(550万人)。结果:平均而言,NO_(2)浓度在滞后1天(前1天)每增加10μg/m^(3),会导致总死亡率、心血管和呼吸系统疾病死亡率分别增加0.46%(95%可信区间0.36%~0.57%)、0.37%(0.22%~0.51%)、0.47%(0.21%~0.72%)。在对共污染物(PM_(10)、PM_(2.5)、臭氧、二氧化硫和一氧化碳)进行调整后,这些关联仍然很稳定。所有3种死因的暴露-反应曲线几乎是线性的,没有明显的阈值。在398个城市中,可归因于高过假定零水平的NO_(2)浓度造成的死亡比例为1.23%(95%可信区间0.96%~1.51%)。结论:这项多中心研究提供了关于NO_(2)短期暴露与总死亡率、心血管和呼吸系统死亡风险之间的独立和线性关联的关键证据,说明通过加强NO_(2)的控制和监管限制标准,可获得人群水平的健康收益。孟夏 刘聪(校) 陈仁杰 郑湃(译) 阚海东(校) Francesco Sera Ana Vicedo-Cabrera Ai Milojevic Maria Guo Yuming Tong Shilu Micheline de Sousa Zanotti Stagliorio Coelh Paulo Hilario Nascimento Saldiva Eric Lavigne Patricia Matus Correa Nicolas Valdes Ortega Samuel Osorio Garcia Jan Kysely Ales Urban Hans Orru Marek Maasikmets Jouni J K Jaakkola Niilo Ryti Veronika Huber Alexandra Schneider Klea Katsouyanni Antonis Analitis Masahiro Hashizume Yasushi Honda Chris Fook Sheng Ng Baltazar Nunes João Paulo Teixeira Iulian Horia Holobaca Simona Fratianni Ho Kim Aurelio Tobias Carmeníniguez Bertil Forsberg ChristoferÅström Martina S Ragettli Yue-Liang Leon Guo Shih-Chun Pan Shanshan Li Michelle L Bell Antonella Zanobetti Joel Schwartz Tangchun Wu Antonio Gasparrini 2021英国医学杂志中文版2021,24,8:7
19Single nucleotide polymorphism in the tumor necrosis factor-alpha gene affects inflammatory bowel diseases risk显示文摘AIM: To investigate the role that single nucleotide polymorphisms (SNPs) in the promoter of the tumour necrosis factor-alpha (TNF-α) gene play in the risk of inflammatory bowel diseases (IBDs) in a New Zealand population, in the context of international studies. METHODS: DNA samples from 388 patients with Crohn's disease (CD), 405 ulcerative colitis (UC), 27 indeterminate colitis (IC) and 201 randomly selected controls, from Canterbury, New Zealand were screened for 3 common polymorphisms in the TNF-α receptor: -238 G→A, -308 G→A and -857C→T, using a TaqmanR assay. A meta-analysis was performed on the data obtained on these polymorphisms combined with that from other published studies. RESULTS: Individuals carrying the -308 G/A allele had a significantly (OR = 1.91, χ2 = 17.36, P < 0.0001) increased risk of pancolitis, and a 1.57-fold increased risk (OR = 1.57, χ2 = 4.34, P = 0.037) of requiring a bowel resection in UC. Carrying the -857 C/T variant decreased the risk of ileocolonic CD (OR = 0.56, χ2 =4.32, P = 0.037), and the need for a bowel resection (OR = 0.59, χ2 = 4.85, P = 0.028). The risk of UC was reduced in individuals who were smokers at diagnosis, (OR = 0.48, χ2 = 4.86, P = 0.028). CONCLUSION: TNF-α is a key cytokine known to play a role in inflammatory response, and the locus for the gene is found in the IBD3 region on chromosome 6p21, known to be associated with an increased risk for IBD. The -308 G/A SNP in the TNF-α promoter is functional, and may account in part for the increased UC risk associated with the IBD3 genomic region. The -857 C/T SNP may decrease IBD risk in certain groups. Pharmaco- or nutrigenomic approaches may be desir- able for individuals with such affected genotypes.Lynnette R Ferguson Claudia Huebner Ivonne Petermann Richard B Gearry Murray L Barclay Pieter Demmers Alan McCulloch Dug Yeo Han 2008World Journal of Gastroenterology2008,14,29:7
20白喉-破伤风-无细胞百日咳-b型流行性感冒嗜血杆菌联合疫苗对中国婴儿安全性和免疫原性的研究显示文摘目的评价白喉-破伤风-无细胞百日咳-b型流行性感冒嗜血杆菌联合疫苗(Diphtheria,Tetanus,Acellular Pertussis and Haemophilus Influenzae Type b Combined Vaccine;DTaP-Hib),对中国婴儿的安全性和免疫原性。方法通过一项安全性研究(研究A)和一项安全性及免疫原性研究(研究B),评价DTaP-Hib联合疫苗接种于3、4、5月龄婴儿的安全性及免疫原性,并与DTaP联合疫苗及Hib疫苗(DTaP+Hib)同时分别接种进行比较。结果共690名健康婴儿接受了DTaP-Hib联合疫苗或DTaP联合疫苗与Hib疫苗分别同时接种的基础免疫。DTaP-Hib联合疫苗的耐受性与DTaP联合疫苗+Hib疫苗分别接种一致,两组局部及全身不良反应发生率差异无统计学意义。在接种DTaP-Hib联合疫苗的受试者中,至少有97.5%在基础免疫后一个月产生了针对白喉、破伤风、Hib的血清学保护性抗体,以及对无细胞百日咳抗原的免疫应答。按照预先制订的标准,DTaP-Hib联合疫苗的免疫应答与DTaP联合疫苗+Hib疫苗分别接种免疫应答应的差异无统计学意义。结论DTaP-Hib联合疫苗接种后可获得预期的安全性和免疫原性。临床试验注册国家食品药品监督管理局《药物临床批件》2003L03331。李艳萍 张庶民 叶强 侯启明 李亚男 李红 徐颖华 马霄 刘幼平 陈晓玲 黄莉荣 Gunasekaran Ramakrishnan 李荣成 赵雷 唐海文 Olivier Van Der Meeren Hans L Bock 2010中国疫苗和免疫2010,16,2:7
返回顶部 每页显示:
共456页 首页 上一页 第1页 下一页 末页 /456 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费