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   3555248篇
  免费   295739篇
  国内免费   14704篇
耳鼻咽喉   49408篇
儿科学   108921篇
妇产科学   92741篇
基础医学   556258篇
口腔科学   98565篇
临床医学   315968篇
内科学   632864篇
皮肤病学   94038篇
神经病学   304108篇
特种医学   141700篇
外国民族医学   454篇
外科学   554657篇
综合类   108556篇
现状与发展   24篇
一般理论   2393篇
预防医学   291481篇
眼科学   81402篇
药学   248784篇
  24篇
中国医学   10489篇
肿瘤学   172856篇
  2021年   55455篇
  2020年   35369篇
  2019年   58459篇
  2018年   71692篇
  2017年   54739篇
  2016年   60539篇
  2015年   74562篇
  2014年   108918篇
  2013年   174468篇
  2012年   96534篇
  2011年   96598篇
  2010年   117555篇
  2009年   122059篇
  2008年   83658篇
  2007年   88123篇
  2006年   98383篇
  2005年   93777篇
  2004年   95892篇
  2003年   86931篇
  2002年   77125篇
  2001年   109840篇
  2000年   102952篇
  1999年   101826篇
  1998年   65571篇
  1997年   63359篇
  1996年   60865篇
  1995年   56246篇
  1994年   50492篇
  1993年   47155篇
  1992年   72051篇
  1991年   68364篇
  1990年   65323篇
  1989年   64653篇
  1988年   60479篇
  1987年   59158篇
  1986年   56610篇
  1985年   56262篇
  1984年   50735篇
  1983年   45975篇
  1982年   42491篇
  1981年   39953篇
  1980年   37785篇
  1979年   43158篇
  1978年   37496篇
  1977年   34383篇
  1976年   31147篇
  1975年   30822篇
  1974年   32576篇
  1973年   31221篇
  1972年   29664篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
105.
106.
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   
107.
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   
108.
109.
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   
110.
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