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   1397799篇
  免费   110211篇
  国内免费   10045篇
耳鼻咽喉   19405篇
儿科学   45830篇
妇产科学   37229篇
基础医学   196219篇
口腔科学   35538篇
临床医学   127162篇
内科学   277754篇
皮肤病学   29371篇
神经病学   106893篇
特种医学   55339篇
外国民族医学   730篇
外科学   208871篇
综合类   45712篇
现状与发展   25篇
一般理论   381篇
预防医学   103270篇
眼科学   31454篇
药学   107126篇
  117篇
中国医学   8432篇
肿瘤学   81197篇
  2021年   13749篇
  2019年   13075篇
  2018年   17146篇
  2017年   13548篇
  2016年   14262篇
  2015年   17467篇
  2014年   23550篇
  2013年   32141篇
  2012年   44636篇
  2011年   47558篇
  2010年   28609篇
  2009年   26403篇
  2008年   42900篇
  2007年   45520篇
  2006年   45817篇
  2005年   44744篇
  2004年   41873篇
  2003年   40501篇
  2002年   39215篇
  2001年   66815篇
  2000年   69450篇
  1999年   59586篇
  1998年   17291篇
  1997年   15853篇
  1996年   15719篇
  1995年   14885篇
  1994年   13993篇
  1993年   12588篇
  1992年   45642篇
  1991年   44420篇
  1990年   43049篇
  1989年   40848篇
  1988年   37536篇
  1987年   36842篇
  1986年   34062篇
  1985年   32692篇
  1984年   24342篇
  1983年   20419篇
  1982年   11828篇
  1981年   10787篇
  1979年   21439篇
  1978年   14863篇
  1977年   12559篇
  1976年   11733篇
  1975年   12660篇
  1974年   14706篇
  1973年   14150篇
  1972年   12961篇
  1971年   11750篇
  1970年   11064篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
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   
65.
66.
67.
BACKGROUNDGuillain-Barré syndrome (GBS) is a rare disorder that typically presents with ascending weakness, pain, paraesthesias, and numbness, which mimic the findings in lumbar spinal stenosis. Here, we report a case of severe lumbar spinal stenosis combined with GBS.CASE SUMMARYA 70-year-old man with a history of lumbar spinal stenosis presented to our emergency department with severe lower back pain and lower extremity numbness. Magnetic resonance imaging confirmed the diagnosis of severe lumbar spinal stenosis. However, his symptoms did not improve postoperatively and he developed dysphagia and upper extremity numbness. An electromyogram was performed. Based on his symptoms, physical examination, and electromyogram, he was diagnosed with GBS. After 5 d of intravenous immunoglobulin (0.4 g/kg/d for 5 d) therapy, he gained 4/5 of strength in his upper and lower extremities and denied paraesthesias. He had regained 5/5 of strength in his extremities when he was discharged and had no symptoms during follow-up.CONCLUSIONGBS should be considered in the differential diagnosis of spinal disorder, even though magnetic resonance imaging shows severe lumbar spinal stenosis. This case highlights the importance of a careful diagnosis when a patient has a history of a disease and comes to the hospital with the same or similar symptoms.  相似文献   
68.
69.
70.
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