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   5011194篇
  免费   387666篇
  国内免费   15441篇
耳鼻咽喉   69736篇
儿科学   160805篇
妇产科学   133806篇
基础医学   749769篇
口腔科学   139000篇
临床医学   464065篇
内科学   914753篇
皮肤病学   119515篇
神经病学   419302篇
特种医学   194053篇
外国民族医学   984篇
外科学   747432篇
综合类   137824篇
现状与发展   27篇
一般理论   3103篇
预防医学   421811篇
眼科学   117780篇
药学   356502篇
  29篇
中国医学   13056篇
肿瘤学   250949篇
  2021年   57339篇
  2019年   59722篇
  2018年   76935篇
  2017年   59094篇
  2016年   65338篇
  2015年   77799篇
  2014年   112454篇
  2013年   178631篇
  2012年   147586篇
  2011年   156857篇
  2010年   133435篇
  2009年   132741篇
  2008年   142569篇
  2007年   153232篇
  2006年   159865篇
  2005年   154488篇
  2004年   154988篇
  2003年   144292篇
  2002年   133110篇
  2001年   192048篇
  2000年   188170篇
  1999年   169872篇
  1998年   75136篇
  1997年   70060篇
  1996年   68317篇
  1995年   63583篇
  1994年   57658篇
  1993年   53356篇
  1992年   125069篇
  1991年   120310篇
  1990年   115879篇
  1989年   112611篇
  1988年   104102篇
  1987年   102055篇
  1986年   96447篇
  1985年   93703篇
  1984年   76559篇
  1983年   67620篇
  1982年   51287篇
  1981年   47433篇
  1980年   44545篇
  1979年   66971篇
  1978年   52919篇
  1977年   46597篇
  1976年   43089篇
  1975年   44077篇
  1974年   49193篇
  1973年   47425篇
  1972年   44618篇
  1971年   41352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.
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