首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4481184篇
  免费   355764篇
  国内免费   15227篇
耳鼻咽喉   60957篇
儿科学   143089篇
妇产科学   118849篇
基础医学   682862篇
口腔科学   124409篇
临床医学   411735篇
内科学   810536篇
皮肤病学   111294篇
神经病学   371288篇
特种医学   173542篇
外国民族医学   570篇
外科学   676946篇
综合类   130942篇
现状与发展   24篇
一般理论   2698篇
预防医学   375677篇
眼科学   106402篇
药学   313947篇
  30篇
中国医学   12473篇
肿瘤学   223905篇
  2021年   56343篇
  2019年   59036篇
  2018年   74833篇
  2017年   57230篇
  2016年   63231篇
  2015年   76330篇
  2014年   110723篇
  2013年   176433篇
  2012年   126296篇
  2011年   132175篇
  2010年   127185篇
  2009年   128015篇
  2008年   118107篇
  2007年   125852篇
  2006年   133557篇
  2005年   128353篇
  2004年   129449篇
  2003年   118670篇
  2002年   107920篇
  2001年   168906篇
  2000年   164154篇
  1999年   150021篇
  1998年   72334篇
  1997年   67931篇
  1996年   65968篇
  1995年   61429篇
  1994年   55526篇
  1993年   51547篇
  1992年   108504篇
  1991年   104403篇
  1990年   99815篇
  1989年   97558篇
  1988年   89983篇
  1987年   88015篇
  1986年   83531篇
  1985年   81295篇
  1984年   68123篇
  1983年   60702篇
  1982年   48352篇
  1981年   45092篇
  1980年   42305篇
  1979年   58975篇
  1978年   47721篇
  1977年   42536篇
  1976年   39197篇
  1975年   39160篇
  1974年   43476篇
  1973年   42114篇
  1972年   39379篇
  1971年   36476篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
102.
103.
104.
105.
106.
107.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
108.
There is a sharp difference in how one views TCR structure–function–behaviour dependent on whether its recognition of major histocompatibility complex‐encoded restriction elements (R) is germline selected or somatically generated. The generally accepted or Standard model is built on the assumption that recognition of R is by the V regions of the αβ TCR, which is not driven by allele specificity, whereas the competing model posits that recognition of R is allele‐specific. The establishing of allele‐specific recognition of R by the TCR would rule out the Standard model and clear the road to a consideration of a competing construct, the Tritope model. Here, the case for allele‐specific recognition (germline selected) is detailed making it obvious that the Standard model is untenable.  相似文献   
109.
110.
Krishna S. Iyer 《Platelets》2020,31(4):474-482
Abstract

Platelets are small, anucleated effector cells that play an important role in linking the hemostatic and inflammatory processes in the body. Platelet function is known to be altered under various inflammatory conditions including aging. A gain in platelet function during aging can increase the risk of thrombotic events, such as stroke and acute myocardial infarction. Anti-platelet therapy is designed to reduce risk of serious cerebrovascular and cardiovascular events, but the adverse consequences of therapy, such as risk for bleeding increases with aging as well. Age-associated comorbidities such as obesity, diabetes, and hyperlipidemia also contribute to increased platelet activity and thus can enhance the risk of thrombosis. Therefore, identification of unique mechanisms of platelet dysfunction in aging and in age-associated comorbidities is warranted to design novel antiplatelet drugs. This review outlines some of the current areas of research on aging-related mechanisms of platelet hyperactivity and addresses the clinical urgency for designing anti-platelet therapies toward novel molecular targets in the aging population.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号