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   2255408篇
  免费   165102篇
  国内免费   7716篇
耳鼻咽喉   29971篇
儿科学   68703篇
妇产科学   60546篇
基础医学   311060篇
口腔科学   65400篇
临床医学   199154篇
内科学   450788篇
皮肤病学   51515篇
神经病学   178290篇
特种医学   93382篇
外国民族医学   442篇
外科学   357626篇
综合类   47202篇
现状与发展   3篇
一般理论   628篇
预防医学   170696篇
眼科学   49462篇
药学   164751篇
  10篇
中国医学   4147篇
肿瘤学   124450篇
  2018年   23462篇
  2017年   19536篇
  2016年   21623篇
  2015年   25380篇
  2014年   33009篇
  2013年   46591篇
  2012年   63868篇
  2011年   62929篇
  2010年   38093篇
  2009年   38464篇
  2008年   57817篇
  2007年   61889篇
  2006年   63724篇
  2005年   68933篇
  2004年   67874篇
  2003年   62167篇
  2002年   55774篇
  2001年   111827篇
  2000年   113731篇
  1999年   97778篇
  1998年   25983篇
  1997年   22804篇
  1996年   23830篇
  1995年   23411篇
  1994年   21790篇
  1993年   20259篇
  1992年   80245篇
  1991年   78047篇
  1990年   75687篇
  1989年   72807篇
  1988年   67213篇
  1987年   65704篇
  1986年   61844篇
  1985年   59276篇
  1984年   43676篇
  1983年   36872篇
  1982年   20954篇
  1981年   18479篇
  1979年   39711篇
  1978年   27663篇
  1977年   23350篇
  1976年   20964篇
  1975年   22991篇
  1974年   27474篇
  1973年   25988篇
  1972年   24495篇
  1971年   22967篇
  1970年   21359篇
  1969年   19996篇
  1968年   18474篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
21.
22.
23.
24.
25.
26.
27.
28.
Past research suggests that as many as 50% of onward human immunodeficiency virus (HIV) transmissions occur during acute and recent HIV infection. It is clearly important to develop interventions which focus on this highly infectious stage of HIV infection to prevent further transmission in the risk networks of acutely and recently infected individuals. Project Protect tries to find recently and acutely infected individuals and prevents HIV transmission in their risk networks. Participants are recruited by community health outreach workers at community-based HIV testing sites and drug users' community venues, by coupon referrals and through referrals from AIDS clinics. When a network with acute/recent infection is identified, network members are interviewed about their risky behaviors, network information is collected, and blood is drawn for HIV testing. Participants are also educated and given prevention materials (condoms, syringes, educational materials); HIV-infected participants are referred to AIDS clinics and are assisted with access to care. Community alerts about elevated risk of HIV transmission are distributed within the risk networks of recently infected. Overall, 342 people were recruited to the project and screened for acute/recent HIV infection. Only six index cases of recent infection (2.3% of all people screened) were found through primary screening at voluntary counseling and testing (VCT) sites, but six cases of recent infection were found through contact tracing of these recently infected participants (7% of network members who came to the interview). Combining screening at VCT sites and contact tracing the number of recently infected people we located as compared to VCT screening alone. No adverse events were encountered. These first results provide evidence for the theory behind the intervention, i.e., in the risk networks of recently infected people there are other people with recent HIV infection and they can be successfully located without increasing stigma for project participants.  相似文献   
29.
A 42‐year‐old man presented with a viral prodrome and tested positive for influenza A. He rapidly deteriorated developing cardiogenic shock, rhabdomyolysis, and acute kidney injury. Patient improved 1 week later with supportive measures including vasopressors, inotropes, and an intraaortic balloon pump. We report this case as it highlights the discordance between echocardiographic ventricular wall thickening as a result of myocardial edema, and electrocardiographic findings at presentation, with a reversal in findings at time of resolution. Additionally, there was some suggestion of a regional pattern to the reduced longitudinal strain.  相似文献   
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