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   1241236篇
  免费   78744篇
  国内免费   1688篇
耳鼻咽喉   17745篇
儿科学   40508篇
妇产科学   32452篇
基础医学   176612篇
口腔科学   34803篇
临床医学   108014篇
内科学   234414篇
皮肤病学   28990篇
神经病学   96895篇
特种医学   50692篇
外国民族医学   224篇
外科学   190147篇
综合类   22743篇
现状与发展   1篇
一般理论   316篇
预防医学   83275篇
眼科学   28770篇
药学   97835篇
  7篇
中国医学   3207篇
肿瘤学   74018篇
  2021年   9095篇
  2019年   9389篇
  2018年   14704篇
  2017年   11588篇
  2016年   13527篇
  2015年   14938篇
  2014年   19124篇
  2013年   27981篇
  2012年   39760篇
  2011年   41658篇
  2010年   23993篇
  2009年   21552篇
  2008年   38708篇
  2007年   41791篇
  2006年   42247篇
  2005年   40887篇
  2004年   39116篇
  2003年   37660篇
  2002年   36309篇
  2001年   64949篇
  2000年   66337篇
  1999年   55089篇
  1998年   13746篇
  1997年   12093篇
  1996年   11844篇
  1995年   11026篇
  1994年   9965篇
  1993年   9451篇
  1992年   39555篇
  1991年   37945篇
  1990年   37383篇
  1989年   35829篇
  1988年   32216篇
  1987年   31361篇
  1986年   29456篇
  1985年   27632篇
  1984年   20126篇
  1983年   16884篇
  1982年   9391篇
  1979年   18028篇
  1978年   12160篇
  1977年   10845篇
  1976年   9413篇
  1975年   10821篇
  1974年   12451篇
  1973年   12029篇
  1972年   11513篇
  1971年   10815篇
  1970年   9906篇
  1969年   9553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.
6.
7.
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   
8.
9.
Individuals with sudden unilateral deafness offer a unique opportunity to study plasticity of the binaural auditory system in adult humans. Stimulation of the intact ear results in increased activity in the auditory cortex. However, there are no reports of changes at sub-cortical levels in humans. Therefore, the aim of the present study was to investigate changes in sub-cortical activity immediately before and after the onset of surgically induced unilateral deafness in adult humans. Click-evoked auditory brainstem responses (ABRs) to stimulation of the healthy ear were recorded from ten adults during the course of translabyrinthine surgery for the removal of a unilateral acoustic neuroma. This surgical technique always results in abrupt deafferentation of the affected ear. The results revealed a rapid (within minutes) reduction in latency of wave V (mean pre = 6.55 ms; mean post = 6.15 ms; p < 0.001). A latency reduction was also observed for wave III (mean pre = 4.40 ms; mean post = 4.13 ms; p < 0.001). These reductions in response latency are consistent with functional changes including disinhibition or/and more rapid intra-cellular signalling affecting binaurally sensitive neurons in the central auditory system. The results are highly relevant for improved understanding of putative physiological mechanisms underlying perceptual disorders such as tinnitus and hyperacusis.  相似文献   
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