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   1276157篇
  免费   99989篇
  国内免费   1987篇
耳鼻咽喉   18429篇
儿科学   44384篇
妇产科学   35024篇
基础医学   182151篇
口腔科学   33609篇
临床医学   111175篇
内科学   257497篇
皮肤病学   28036篇
神经病学   100508篇
特种医学   51267篇
外国民族医学   660篇
外科学   196465篇
综合类   27055篇
现状与发展   1篇
一般理论   377篇
预防医学   95738篇
眼科学   27874篇
药学   94810篇
  2篇
中国医学   2423篇
肿瘤学   70648篇
  2018年   13159篇
  2017年   9990篇
  2016年   10926篇
  2015年   12412篇
  2014年   17218篇
  2013年   26281篇
  2012年   36105篇
  2011年   38160篇
  2010年   22863篇
  2009年   21855篇
  2008年   36739篇
  2007年   39356篇
  2006年   39624篇
  2005年   38540篇
  2004年   37675篇
  2003年   36557篇
  2002年   35874篇
  2001年   64075篇
  2000年   66559篇
  1999年   56473篇
  1998年   15160篇
  1997年   13773篇
  1996年   14219篇
  1995年   13478篇
  1994年   12782篇
  1993年   11810篇
  1992年   44538篇
  1991年   43493篇
  1990年   42247篇
  1989年   40144篇
  1988年   36898篇
  1987年   36245篇
  1986年   33628篇
  1985年   32294篇
  1984年   24139篇
  1983年   20240篇
  1982年   11701篇
  1981年   10650篇
  1980年   9471篇
  1979年   21318篇
  1978年   14809篇
  1977年   12509篇
  1976年   11679篇
  1975年   12610篇
  1974年   14659篇
  1973年   14120篇
  1972年   12956篇
  1971年   11734篇
  1970年   11049篇
  1969年   10029篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
51.
52.
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   
53.
54.
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   
55.
56.
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   
57.
58.
59.
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   
60.
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