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   960567篇
  免费   67773篇
  国内免费   1519篇
耳鼻咽喉   13174篇
儿科学   24958篇
妇产科学   23609篇
基础医学   136660篇
口腔科学   28929篇
临床医学   82506篇
内科学   190655篇
皮肤病学   19667篇
神经病学   74252篇
特种医学   37743篇
外国民族医学   79篇
外科学   157262篇
综合类   18163篇
现状与发展   1篇
一般理论   234篇
预防医学   62671篇
眼科学   21663篇
药学   74507篇
  3篇
中国医学   2265篇
肿瘤学   60858篇
  2018年   9581篇
  2017年   7526篇
  2016年   8331篇
  2015年   9497篇
  2014年   12800篇
  2013年   18451篇
  2012年   25609篇
  2011年   26673篇
  2010年   15720篇
  2009年   14990篇
  2008年   26005篇
  2007年   27212篇
  2006年   27979篇
  2005年   26944篇
  2004年   26104篇
  2003年   25063篇
  2002年   24644篇
  2001年   55471篇
  2000年   57217篇
  1999年   47651篇
  1998年   11161篇
  1997年   9808篇
  1996年   9896篇
  1995年   9200篇
  1994年   8526篇
  1993年   7830篇
  1992年   35947篇
  1991年   34312篇
  1990年   33054篇
  1989年   32261篇
  1988年   29293篇
  1987年   28564篇
  1986年   26619篇
  1985年   25444篇
  1984年   18030篇
  1983年   15314篇
  1982年   7905篇
  1981年   6886篇
  1979年   15940篇
  1978年   10727篇
  1977年   9159篇
  1976年   7969篇
  1975年   8739篇
  1974年   10577篇
  1973年   9954篇
  1972年   9438篇
  1971年   8957篇
  1970年   8503篇
  1969年   8016篇
  1968年   7288篇
排序方式: 共有10000条查询结果,搜索用时 15 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.
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   
8.
9.
10.
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