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   1974230篇
  免费   147896篇
  国内免费   3779篇
耳鼻咽喉   28706篇
儿科学   66561篇
妇产科学   55584篇
基础医学   280827篇
口腔科学   53930篇
临床医学   170867篇
内科学   394416篇
皮肤病学   42487篇
神经病学   156110篇
特种医学   78689篇
外国民族医学   939篇
外科学   305462篇
综合类   43005篇
现状与发展   1篇
一般理论   594篇
预防医学   147987篇
眼科学   44577篇
药学   145170篇
  2篇
中国医学   3872篇
肿瘤学   106119篇
  2018年   20010篇
  2017年   15411篇
  2016年   16784篇
  2015年   19049篇
  2014年   26789篇
  2013年   41216篇
  2012年   56139篇
  2011年   59537篇
  2010年   35830篇
  2009年   34105篇
  2008年   56981篇
  2007年   60934篇
  2006年   61216篇
  2005年   59892篇
  2004年   58030篇
  2003年   56260篇
  2002年   55208篇
  2001年   93316篇
  2000年   96542篇
  1999年   82141篇
  1998年   22662篇
  1997年   20635篇
  1996年   20884篇
  1995年   19658篇
  1994年   18663篇
  1993年   17417篇
  1992年   64800篇
  1991年   63207篇
  1990年   61642篇
  1989年   58832篇
  1988年   54355篇
  1987年   53550篇
  1986年   50369篇
  1985年   48336篇
  1984年   36200篇
  1983年   30654篇
  1982年   18151篇
  1981年   16247篇
  1979年   32933篇
  1978年   22951篇
  1977年   19413篇
  1976年   18297篇
  1975年   19902篇
  1974年   23569篇
  1973年   22651篇
  1972年   21099篇
  1971年   19243篇
  1970年   18390篇
  1969年   16847篇
  1968年   15768篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
Behçet disease is a complex, multisystem disease characterized by recurrent oral and genital ulcerations. It rarely occurs in infants or children. Neonatal Behçet disease has been reported in infants whose ulcers resolve at or before 9 weeks of age. Few cases of neonatal Behçet disease persisting into childhood have previously been reported. We report the case of a 1‐month‐old infant who presented with severe recurrent genital ulcerations and at 6 months developed recurrent oral ulcerations. Her orogenital ulcerations continue to recur. Human leukocyte antigen testing revealed HLA‐B51 and B44 positivity. This is a case of pediatric Behçet disease in the neonatal period. Behçet disease should be considered in the differential diagnosis of recurrent genital and oral ulcerations in infants and children.  相似文献   
72.
73.
74.
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   
75.
76.
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   
77.
78.
79.
80.
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   
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