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   3499780篇
  免费   307319篇
  国内免费   13953篇
耳鼻咽喉   48024篇
儿科学   110444篇
妇产科学   89072篇
基础医学   556551篇
口腔科学   94462篇
临床医学   318052篇
内科学   623382篇
皮肤病学   90011篇
神经病学   302228篇
特种医学   140099篇
外国民族医学   326篇
外科学   542285篇
综合类   106802篇
现状与发展   25篇
一般理论   2314篇
预防医学   298849篇
眼科学   80226篇
药学   241784篇
  24篇
中国医学   9704篇
肿瘤学   166388篇
  2021年   55427篇
  2020年   35264篇
  2019年   58332篇
  2018年   71864篇
  2017年   54704篇
  2016年   60454篇
  2015年   74544篇
  2014年   108890篇
  2013年   174201篇
  2012年   96699篇
  2011年   97204篇
  2010年   117994篇
  2009年   122009篇
  2008年   84041篇
  2007年   88042篇
  2006年   98280篇
  2005年   93925篇
  2004年   95770篇
  2003年   86588篇
  2002年   75690篇
  2001年   111412篇
  2000年   105001篇
  1999年   102503篇
  1998年   66358篇
  1997年   63973篇
  1996年   62103篇
  1995年   57842篇
  1994年   51922篇
  1993年   48584篇
  1992年   73949篇
  1991年   70656篇
  1990年   66885篇
  1989年   65300篇
  1988年   60568篇
  1987年   59224篇
  1986年   56035篇
  1985年   56162篇
  1984年   50586篇
  1983年   45900篇
  1982年   42689篇
  1981年   40087篇
  1980年   37778篇
  1979年   41910篇
  1978年   36684篇
  1977年   33243篇
  1976年   30568篇
  1975年   29163篇
  1974年   30434篇
  1973年   29156篇
  1972年   27136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