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   1257708篇
  免费   80615篇
  国内免费   4090篇
耳鼻咽喉   16015篇
儿科学   39379篇
妇产科学   36236篇
基础医学   172528篇
口腔科学   33894篇
临床医学   112937篇
内科学   245329篇
皮肤病学   32477篇
神经病学   98409篇
特种医学   49616篇
外国民族医学   238篇
外科学   189830篇
综合类   23968篇
现状与发展   1篇
一般理论   392篇
预防医学   91943篇
眼科学   26487篇
药学   96371篇
  8篇
中国医学   3003篇
肿瘤学   73352篇
  2021年   12422篇
  2019年   11967篇
  2018年   13879篇
  2017年   11759篇
  2016年   13481篇
  2015年   14954篇
  2014年   19820篇
  2013年   29090篇
  2012年   35324篇
  2011年   37649篇
  2010年   23608篇
  2009年   23353篇
  2008年   34825篇
  2007年   37041篇
  2006年   38465篇
  2005年   36491篇
  2004年   35052篇
  2003年   34113篇
  2002年   32739篇
  2001年   63478篇
  2000年   64299篇
  1999年   54186篇
  1998年   15997篇
  1997年   14315篇
  1996年   14327篇
  1995年   14088篇
  1994年   12909篇
  1993年   12056篇
  1992年   41302篇
  1991年   39648篇
  1990年   38723篇
  1989年   37424篇
  1988年   33625篇
  1987年   32843篇
  1986年   30965篇
  1985年   29377篇
  1984年   21908篇
  1983年   18638篇
  1982年   11159篇
  1981年   10029篇
  1979年   18930篇
  1978年   13300篇
  1977年   12123篇
  1976年   10337篇
  1975年   11566篇
  1974年   12866篇
  1973年   12395篇
  1972年   11697篇
  1971年   10895篇
  1970年   9988篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
4.
5.
6.
As millions of people turn to social media for health information, better understanding the factors that guide health-related judgments and perceptions in this context is imperative. We report on two Web experiments (n > 400 total) examining the power of society’s widespread weight bias and related stereotypes to influence nutrition judgments in social media spaces. In Experiment 1, meals were judged as lower in nutritional quality when the person who recommended them (the source) was depicted as obese rather than of normal weight, an effect mediated by stereotypic beliefs about the source as a generally unhealthy person. Experiment 2 replicated this effect, which—notably—remained significant when controlling for objective nutritional information (calories and fat content). Results highlight spillover effects of weight bias that extend beyond person perception to color impressions of objects (here, food) that are associated with stigmatized attributes. Implications for everyday nutrition judgments and public health are considered.  相似文献   
7.
8.
9.
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   
10.
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   
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