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   3083830篇
  免费   220273篇
  国内免费   4435篇
耳鼻咽喉   43222篇
儿科学   100188篇
妇产科学   83123篇
基础医学   450341篇
口腔科学   85714篇
临床医学   278404篇
内科学   591022篇
皮肤病学   68661篇
神经病学   240687篇
特种医学   117292篇
外国民族医学   676篇
外科学   464420篇
综合类   63117篇
现状与发展   13篇
一般理论   1044篇
预防医学   235542篇
眼科学   72178篇
药学   235427篇
  18篇
中国医学   6539篇
肿瘤学   170910篇
  2019年   24424篇
  2018年   34031篇
  2017年   25923篇
  2016年   29179篇
  2015年   32780篇
  2014年   45984篇
  2013年   68875篇
  2012年   94575篇
  2011年   100650篇
  2010年   59818篇
  2009年   56275篇
  2008年   94284篇
  2007年   100679篇
  2006年   101601篇
  2005年   98293篇
  2004年   94132篇
  2003年   90750篇
  2002年   87840篇
  2001年   145908篇
  2000年   150074篇
  1999年   125928篇
  1998年   35434篇
  1997年   31143篇
  1996年   31453篇
  1995年   29577篇
  1994年   27210篇
  1993年   25665篇
  1992年   96977篇
  1991年   94306篇
  1990年   92441篇
  1989年   88943篇
  1988年   81538篇
  1987年   79950篇
  1986年   75053篇
  1985年   71545篇
  1984年   52944篇
  1983年   44983篇
  1982年   26252篇
  1979年   48441篇
  1978年   34070篇
  1977年   28972篇
  1976年   26994篇
  1975年   29530篇
  1974年   35028篇
  1973年   33518篇
  1972年   31691篇
  1971年   29945篇
  1970年   27599篇
  1969年   26414篇
  1968年   23982篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
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   
103.
A 42‐year‐old man presented with a viral prodrome and tested positive for influenza A. He rapidly deteriorated developing cardiogenic shock, rhabdomyolysis, and acute kidney injury. Patient improved 1 week later with supportive measures including vasopressors, inotropes, and an intraaortic balloon pump. We report this case as it highlights the discordance between echocardiographic ventricular wall thickening as a result of myocardial edema, and electrocardiographic findings at presentation, with a reversal in findings at time of resolution. Additionally, there was some suggestion of a regional pattern to the reduced longitudinal strain.  相似文献   
104.
105.
106.
The aim of the study was to determine the effect of β-glucan on the cytotoxicity and genotoxicity of polypectomized patient's fecal water (FW). Polypectomized volunteers (n = 69) were randomly assigned to consume bread with or without β-glucan, for 3 months. FW was collected at the beginning (t = 0), the 30th and 90th day and 2 wk after the intervention. Cytotoxicity and genotoxicity were estimated on Caco-2 cells, using trypan blue exclusion test and comet assay, respectively. Gastrointestinal symptoms were recorded and subjects kept a 3-day food diary at baseline and after completion. Trypan blue exclusion test revealed cell survival of approximately 87% after incubation with FW. The FW samples showed 49% genotoxicity at the baseline. Genotoxicity in the intervention group decreased during the trial reaching statistical significance on the 90th day compared to control. An increase was noticed 2 wk after the trial, but it still remained significantly lower compared to control. Group-specific analysis for β-glucan also revealed significant decrease in the genotoxicity on the 90th day compared to baseline. β-glucan ingestion in polypectomized patients significantly decreased the genotoxicity of their FW. Our findings suggest that β-glucan consumption could possibly provide protection against colon cancer development.  相似文献   
107.
108.
European Journal of Orthopaedic Surgery & Traumatology - The goals of this study were to compare patient satisfaction and wound-related complications in patients receiving 2-octyl cyanoacrylate...  相似文献   
109.
110.
Graefe's Archive for Clinical and Experimental Ophthalmology - To evaluate the long-term safety and efficacy of intrastromal bevacizumab for treatment of deep corneal neovascularization in...  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