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   1396172篇
  免费   102624篇
  国内免费   18720篇
耳鼻咽喉   18665篇
儿科学   32862篇
妇产科学   33300篇
基础医学   194861篇
口腔科学   39594篇
临床医学   132094篇
内科学   264417篇
皮肤病学   27256篇
神经病学   102809篇
特种医学   53420篇
外国民族医学   298篇
外科学   210571篇
综合类   60584篇
现状与发展   57篇
一般理论   305篇
预防医学   87289篇
眼科学   35016篇
药学   115318篇
  198篇
中国医学   16095篇
肿瘤学   92507篇
  2022年   12408篇
  2021年   19044篇
  2020年   13434篇
  2019年   15469篇
  2018年   20141篇
  2017年   16450篇
  2016年   16839篇
  2015年   21806篇
  2014年   28470篇
  2013年   33571篇
  2012年   47282篇
  2011年   50365篇
  2010年   29738篇
  2009年   26637篇
  2008年   42279篇
  2007年   44058篇
  2006年   44693篇
  2005年   43174篇
  2004年   37692篇
  2003年   36079篇
  2002年   34324篇
  2001年   75888篇
  2000年   78283篇
  1999年   66240篇
  1998年   17654篇
  1997年   15763篇
  1996年   14838篇
  1995年   13877篇
  1994年   12458篇
  1993年   10887篇
  1992年   46838篇
  1991年   44271篇
  1990年   42323篇
  1989年   41261篇
  1988年   37454篇
  1987年   36376篇
  1986年   33809篇
  1985年   31957篇
  1984年   22525篇
  1983年   18917篇
  1982年   9777篇
  1979年   19569篇
  1978年   13004篇
  1977年   11198篇
  1975年   10548篇
  1974年   12730篇
  1973年   11986篇
  1972年   11419篇
  1971年   10904篇
  1970年   10270篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
5.
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   
6.
7.
8.
9.
10.
Abstract

Objective: To understand the origin of extremely high gonadotropin levels in a perimenopausal woman.

Methods: A 52-year-old woman with a 2?months of amenorrhea followed spontaneous menstrual cycles recovery was referred to our outpatient clinic with elevated follicle-stimulating hormone (FSH, 483 mUI/ml), luteinizing hormone (LH, 475 mUI/ml) and prolactin (PRL, 173?ng/ml). She was known to take levosulpiride. The gonadotropin levels did not fit with the clinical features.

Results: A gonadotroph tumor was ruled out. Further analysis confirmed constantly high FSH, LH and PRL levels. The measurements were repeated using different analytical platforms with different results. After serial dilutions, nonlinearity was present suggesting an immunoassay interference. After post-polyethylene glycol recovery, hormone levels appeared in the normal range. Anti-goat antibodies were recognized in the serum of the patient.

Conclusions: This case report shows a case of falsely abnormal high gonadotropin and PRL levels in a woman during menopause transition. In the clinical practice the evaluation of gonadotropin profile is not recommended at this age, but the abnormal levels stimulated further evaluation. An interference in the assay due to anti-goat antibodies resulted in abnormally high level of FSH and LH. A strict collaboration between clinicians and the laboratory is needed, when laboratory findings do not correspond to clinical findings.  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