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   3517593篇
  免费   296441篇
  国内免费   16042篇
耳鼻咽喉   47627篇
儿科学   112217篇
妇产科学   91758篇
基础医学   559901篇
口腔科学   95677篇
临床医学   324135篇
内科学   621994篇
皮肤病学   91521篇
神经病学   302962篇
特种医学   135663篇
外国民族医学   392篇
外科学   532740篇
综合类   106505篇
现状与发展   23篇
一般理论   2302篇
预防医学   305006篇
眼科学   79746篇
药学   241561篇
  27篇
中国医学   10570篇
肿瘤学   167749篇
  2021年   56121篇
  2020年   35697篇
  2019年   58865篇
  2018年   72744篇
  2017年   55359篇
  2016年   60983篇
  2015年   75048篇
  2014年   109580篇
  2013年   175256篇
  2012年   101453篇
  2011年   102836篇
  2010年   120007篇
  2009年   123206篇
  2008年   88135篇
  2007年   91563篇
  2006年   101742篇
  2005年   96817篇
  2004年   97678篇
  2003年   87856篇
  2002年   77340篇
  2001年   107475篇
  2000年   100804篇
  1999年   99545篇
  1998年   65780篇
  1997年   63612篇
  1996年   61270篇
  1995年   56881篇
  1994年   51031篇
  1993年   47604篇
  1992年   70781篇
  1991年   67897篇
  1990年   64441篇
  1989年   62814篇
  1988年   58404篇
  1987年   57002篇
  1986年   54413篇
  1985年   54281篇
  1984年   49258篇
  1983年   44877篇
  1982年   42018篇
  1981年   39598篇
  1980年   37234篇
  1979年   40764篇
  1978年   35921篇
  1977年   32469篇
  1976年   30312篇
  1975年   28545篇
  1974年   30021篇
  1973年   28913篇
  1972年   27058篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
122.
123.
124.
125.
126.
127.
128.
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   
129.
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   
130.
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   
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