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   2061257篇
  免费   150189篇
  国内免费   4221篇
耳鼻咽喉   27047篇
儿科学   68037篇
妇产科学   56169篇
基础医学   301229篇
口腔科学   59845篇
临床医学   183366篇
内科学   399027篇
皮肤病学   47533篇
神经病学   157387篇
特种医学   76899篇
外国民族医学   302篇
外科学   312099篇
综合类   45348篇
现状与发展   4篇
一般理论   622篇
预防医学   154164篇
眼科学   49313篇
药学   152638篇
  7篇
中国医学   5100篇
肿瘤学   119531篇
  2019年   15824篇
  2018年   23159篇
  2017年   17579篇
  2016年   19335篇
  2015年   21931篇
  2014年   30244篇
  2013年   44600篇
  2012年   61582篇
  2011年   65334篇
  2010年   38557篇
  2009年   36108篇
  2008年   61036篇
  2007年   65018篇
  2006年   65739篇
  2005年   62646篇
  2004年   60672篇
  2003年   57641篇
  2002年   55798篇
  2001年   106992篇
  2000年   109488篇
  1999年   90466篇
  1998年   23555篇
  1997年   20640篇
  1996年   20960篇
  1995年   19961篇
  1994年   18344篇
  1993年   17002篇
  1992年   68286篇
  1991年   66638篇
  1990年   64420篇
  1989年   61960篇
  1988年   56550篇
  1987年   55375篇
  1986年   51969篇
  1985年   49423篇
  1984年   36325篇
  1983年   30965篇
  1982年   17319篇
  1979年   32636篇
  1978年   22867篇
  1977年   19390篇
  1976年   18255篇
  1975年   19587篇
  1974年   23681篇
  1973年   22638篇
  1972年   21226篇
  1971年   19798篇
  1970年   18411篇
  1969年   17313篇
  1968年   16222篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
Graefe's Archive for Clinical and Experimental Ophthalmology - The published online version contains mistake as the author's first name and last name have been interchanged as "Hild...  相似文献   
24.
25.
Coronary embolism (CE) is an uncommon and unique cause of acute myocardial infarction. In this report, we review 216 cases of CE including 2 new cases from our institution. The mean patient age was 52.5 years and 62% of the patients were males. Chest pain was the most common presenting symptom followed by dyspnea, and the most commonly affected vessel was the left anterior descending artery. Leading etiologies of the embolus were atrial fibrillation, septic emboli, and iatrogenic causes. Treatment approaches varied with thrombus aspiration being used in 30% of cases. In-hospital mortality rate was 36% and 13% of the cases were complicated by cerebrovascular accident. CE is a unique pathology that leads to acute myocardial infarction. It portends a high mortality rate and requires a high level of suspicion as symptoms may be misleading. Further research is needed in order to improve recognition and management and to lower associated mortality.  相似文献   
26.
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   
27.
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   
28.
29.
30.
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