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   1278696篇
  免费   99956篇
  国内免费   2009篇
耳鼻咽喉   18445篇
儿科学   44480篇
妇产科学   35061篇
基础医学   182462篇
口腔科学   33593篇
临床医学   111392篇
内科学   258585篇
皮肤病学   28053篇
神经病学   100469篇
特种医学   51247篇
外国民族医学   661篇
外科学   196688篇
综合类   27170篇
现状与发展   1篇
一般理论   377篇
预防医学   95863篇
眼科学   27944篇
药学   94915篇
  2篇
中国医学   2429篇
肿瘤学   70824篇
  2018年   13168篇
  2017年   9995篇
  2016年   10949篇
  2015年   12425篇
  2014年   17222篇
  2013年   26288篇
  2012年   36132篇
  2011年   38180篇
  2010年   22859篇
  2009年   21880篇
  2008年   36729篇
  2007年   39353篇
  2006年   39622篇
  2005年   38539篇
  2004年   37690篇
  2003年   36515篇
  2002年   35856篇
  2001年   64033篇
  2000年   66536篇
  1999年   56453篇
  1998年   15147篇
  1997年   13770篇
  1996年   14205篇
  1995年   13460篇
  1994年   12776篇
  1993年   11798篇
  1992年   44579篇
  1991年   43501篇
  1990年   42251篇
  1989年   40133篇
  1988年   36914篇
  1987年   36252篇
  1986年   33636篇
  1985年   32299篇
  1984年   24149篇
  1983年   20276篇
  1982年   11732篇
  1981年   10704篇
  1980年   9525篇
  1979年   21360篇
  1978年   14838篇
  1977年   12549篇
  1976年   11702篇
  1975年   12643篇
  1974年   14677篇
  1973年   14133篇
  1972年   12964篇
  1971年   11747篇
  1970年   11059篇
  1969年   10039篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
Pharmaceutical Chemistry Journal - Three extracts were produced from the above-ground part of the meadowsweet Filipendula ulmaria (L.) Maxim. using water, 40% ethanol, and 70% ethanol. Comparative...  相似文献   
42.
43.
Haemophilia is a common cause of genetically inherited bleeding disorders. Pseudotumours occur in 1–2 % of persons with severe forms of haemophilia. These are a result of repeated haemorrhage into soft tissues, subperiosteum or a site of bone fracture with inadequate resorption of the extravasated blood. There are a number of therapeutic alternatives for this dangerous condition: surgical removal, percutaneous management, irradiation, embolization etc. In this case report, we describe the natural history, clinical course and successful surgical management of a patient with haemophilia who presented with a massive pseudotumour. We also briefly review the relevant literature on the various therapeutic modalities that have been implemented in the management of this rare complication. Though surgeons may be averse to operate on haemophiliacs, primary surgical management as done in our case may prove to be the definitive treatment option for such patients.  相似文献   
44.
45.
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   
46.
47.
48.
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   
49.
50.
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