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   2887657篇
  免费   222906篇
  国内免费   5465篇
耳鼻咽喉   38912篇
儿科学   95263篇
妇产科学   80148篇
基础医学   410620篇
口腔科学   85797篇
临床医学   259672篇
内科学   559089篇
皮肤病学   63828篇
神经病学   229312篇
特种医学   112264篇
外国民族医学   702篇
外科学   438177篇
综合类   70117篇
现状与发展   6篇
一般理论   1011篇
预防医学   220690篇
眼科学   68386篇
药学   215231篇
  9篇
中国医学   6370篇
肿瘤学   160424篇
  2018年   30401篇
  2017年   23409篇
  2016年   25817篇
  2015年   29595篇
  2014年   41088篇
  2013年   61341篇
  2012年   84089篇
  2011年   88654篇
  2010年   52520篇
  2009年   49417篇
  2008年   83432篇
  2007年   88431篇
  2006年   89315篇
  2005年   86036篇
  2004年   83960篇
  2003年   80208篇
  2002年   77791篇
  2001年   141001篇
  2000年   145068篇
  1999年   121410篇
  1998年   32900篇
  1997年   29277篇
  1996年   29219篇
  1995年   28214篇
  1994年   26266篇
  1993年   24435篇
  1992年   96215篇
  1991年   93446篇
  1990年   90642篇
  1989年   87398篇
  1988年   80542篇
  1987年   78944篇
  1986年   75018篇
  1985年   71994篇
  1984年   53363篇
  1983年   45843篇
  1982年   26417篇
  1981年   23638篇
  1979年   49444篇
  1978年   34127篇
  1977年   29004篇
  1976年   27223篇
  1975年   28839篇
  1974年   35180篇
  1973年   33795篇
  1972年   31215篇
  1971年   29307篇
  1970年   27092篇
  1969年   25356篇
  1968年   23377篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
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   
35.
36.
37.
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   
38.
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   
39.
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   
40.
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