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   2692259篇
  免费   191509篇
  国内免费   5847篇
耳鼻咽喉   37711篇
儿科学   86571篇
妇产科学   75997篇
基础医学   381064篇
口腔科学   79861篇
临床医学   237672篇
内科学   521391篇
皮肤病学   61145篇
神经病学   211084篇
特种医学   103275篇
外国民族医学   659篇
外科学   410235篇
综合类   62902篇
现状与发展   10篇
一般理论   926篇
预防医学   196510篇
眼科学   65041篇
药学   199479篇
  11篇
中国医学   6429篇
肿瘤学   151642篇
  2018年   27990篇
  2017年   21597篇
  2016年   23949篇
  2015年   27178篇
  2014年   37951篇
  2013年   56515篇
  2012年   76592篇
  2011年   80995篇
  2010年   48114篇
  2009年   45458篇
  2008年   76058篇
  2007年   82011篇
  2006年   82620篇
  2005年   79462篇
  2004年   77058篇
  2003年   73816篇
  2002年   71807篇
  2001年   131536篇
  2000年   134701篇
  1999年   112685篇
  1998年   30491篇
  1997年   27227篇
  1996年   26700篇
  1995年   25498篇
  1994年   23518篇
  1993年   21900篇
  1992年   86474篇
  1991年   84046篇
  1990年   81516篇
  1989年   78876篇
  1988年   72504篇
  1987年   71278篇
  1986年   67676篇
  1985年   64314篇
  1984年   47934篇
  1983年   40852篇
  1982年   23822篇
  1981年   21512篇
  1979年   44458篇
  1978年   31277篇
  1977年   26859篇
  1976年   24637篇
  1975年   27181篇
  1974年   32562篇
  1973年   31602篇
  1972年   29815篇
  1971年   27791篇
  1970年   26092篇
  1969年   24728篇
  1968年   23241篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  相似文献   
52.
53.
54.
55.
56.
57.
Red cell exchange (RCE) is a common procedure in adults with sickle cell disease (SCD). Implantable dual lumen Vortex (DLV) ports can be used for RCE in patients with poor peripheral venous access. We performed a retrospective cohort study of RCE procedures performed in adults with SCD. The main objective of the study was to compare the inlet speed, duration of procedures and rate of complications performed through DLV ports to those performed through temporary central venous and peripheral catheters. Twenty‐nine adults with SCD underwent a total of 318 RCE procedures. Twenty adults had DLV ports placed and 218 procedures were performed using DLV ports. Mean length of follow‐up after DLV port placement was 397 ± 263 days. Six DLV ports were removed due to infection and 1 for malfunction after a mean of 171 ± 120 days. Compared to temporary central venous and peripheral catheters, DLV port procedures had a greater rate of procedural complications, a longer duration, and a lower inlet speed (all P < 0.01). When accounting for the maximum allowable inlet speed to avoid citrate toxicity, 40% of DLV port procedures were greater than 10% below maximum speed, compared to 7 and 14% of procedures performed through temporary central venous and peripheral catheters (P < 0.0001). In conclusion, DLV ports can be used for RCE in adults with SCD, albeit with more procedural complications and longer duration. The smaller internal diameter and longer catheter of DLV ports compared to temporary central venous catheters likely accounts for the differences noted. J. Clin. Apheresis 30:353–358, 2015. © 2015 Wiley Periodicals, Inc.  相似文献   
58.
59.
60.
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   
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