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   4347239篇
  免费   348442篇
  国内免费   14682篇
耳鼻咽喉   60292篇
儿科学   139400篇
妇产科学   114201篇
基础医学   666487篇
口腔科学   117957篇
临床医学   396864篇
内科学   790177篇
皮肤病学   107714篇
神经病学   368158篇
特种医学   169431篇
外国民族医学   753篇
外科学   656000篇
综合类   121262篇
现状与发展   24篇
一般理论   2614篇
预防医学   360288篇
眼科学   100876篇
药学   307504篇
  26篇
中国医学   11933篇
肿瘤学   218402篇
  2021年   56125篇
  2020年   35799篇
  2019年   58781篇
  2018年   74348篇
  2017年   56965篇
  2016年   63076篇
  2015年   76043篇
  2014年   110242篇
  2013年   175768篇
  2012年   124158篇
  2011年   128868篇
  2010年   125839篇
  2009年   127566篇
  2008年   115093篇
  2007年   122356篇
  2006年   131176篇
  2005年   125263篇
  2004年   126574篇
  2003年   116788篇
  2002年   106036篇
  2001年   166936篇
  2000年   162011篇
  1999年   148663篇
  1998年   71656篇
  1997年   67603篇
  1996年   65621篇
  1995年   61041篇
  1994年   54967篇
  1993年   51011篇
  1992年   106618篇
  1991年   101382篇
  1990年   97244篇
  1989年   94812篇
  1988年   87143篇
  1987年   85311篇
  1986年   80196篇
  1985年   78355篇
  1984年   65394篇
  1983年   58196篇
  1982年   47188篇
  1981年   43857篇
  1980年   41073篇
  1979年   55101篇
  1978年   44756篇
  1977年   39979篇
  1976年   36840篇
  1975年   36807篇
  1974年   39610篇
  1973年   37753篇
  1972年   35360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