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   4034868篇
  免费   326848篇
  国内免费   15234篇
耳鼻咽喉   56770篇
儿科学   122189篇
妇产科学   105892篇
基础医学   619661篇
口腔科学   115252篇
临床医学   362014篇
内科学   724297篇
皮肤病学   102683篇
神经病学   339380篇
特种医学   159968篇
外国民族医学   519篇
外科学   627454篇
综合类   118965篇
现状与发展   24篇
一般理论   2415篇
预防医学   326315篇
眼科学   94308篇
药学   287120篇
  25篇
中国医学   11613篇
肿瘤学   200086篇
  2021年   55474篇
  2020年   35394篇
  2019年   58487篇
  2018年   72437篇
  2017年   55420篇
  2016年   61315篇
  2015年   75037篇
  2014年   109350篇
  2013年   174812篇
  2012年   105167篇
  2011年   106613篇
  2010年   120072篇
  2009年   123888篇
  2008年   94693篇
  2007年   99979篇
  2006年   109939篇
  2005年   104932篇
  2004年   106701篇
  2003年   97506篇
  2002年   87851篇
  2001年   143973篇
  2000年   138504篇
  1999年   130446篇
  1998年   69034篇
  1997年   65796篇
  1996年   63380篇
  1995年   58842篇
  1994年   52864篇
  1993年   49324篇
  1992年   94546篇
  1991年   90264篇
  1990年   86754篇
  1989年   85275篇
  1988年   79314篇
  1987年   77538篇
  1986年   73719篇
  1985年   72837篇
  1984年   61914篇
  1983年   55488篇
  1982年   46122篇
  1981年   43009篇
  1980年   40513篇
  1979年   53751篇
  1978年   44141篇
  1977年   40153篇
  1976年   36224篇
  1975年   36726篇
  1974年   39971篇
  1973年   38304篇
  1972年   36313篇
排序方式: 共有10000条查询结果,搜索用时 4 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