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   1075079篇
  免费   73359篇
  国内免费   1364篇
耳鼻咽喉   15052篇
儿科学   34647篇
妇产科学   28658篇
基础医学   153676篇
口腔科学   29581篇
临床医学   95099篇
内科学   203943篇
皮肤病学   24421篇
神经病学   81623篇
特种医学   42997篇
外国民族医学   203篇
外科学   163344篇
综合类   21706篇
现状与发展   1篇
一般理论   263篇
预防医学   74854篇
眼科学   24531篇
药学   86254篇
  7篇
中国医学   2805篇
肿瘤学   66137篇
  2019年   7793篇
  2018年   11347篇
  2017年   8935篇
  2016年   10118篇
  2015年   11291篇
  2014年   15312篇
  2013年   22265篇
  2012年   30652篇
  2011年   32413篇
  2010年   19035篇
  2009年   17881篇
  2008年   30031篇
  2007年   32159篇
  2006年   32803篇
  2005年   31124篇
  2004年   29832篇
  2003年   28632篇
  2002年   27610篇
  2001年   60088篇
  2000年   61544篇
  1999年   50997篇
  1998年   12467篇
  1997年   11022篇
  1996年   11035篇
  1995年   10345篇
  1994年   9356篇
  1993年   8871篇
  1992年   37849篇
  1991年   36325篇
  1990年   35784篇
  1989年   34332篇
  1988年   30898篇
  1987年   30021篇
  1986年   28247篇
  1985年   26479篇
  1984年   19207篇
  1983年   16142篇
  1982年   8832篇
  1979年   17047篇
  1978年   11415篇
  1977年   10241篇
  1976年   8843篇
  1975年   10077篇
  1974年   11663篇
  1973年   11286篇
  1972年   10760篇
  1971年   10097篇
  1970年   9257篇
  1969年   8948篇
  1968年   7921篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
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   
34.
35.
BackgroundSecond-hand smoking or environmental tobacco smoke is a critical health risk. Children are the most vulnerable to second-hand smoking because of their small bronchial ducts, less developed immunity, and low-physical activity.ObjectivesThe purpose of this study was to ascertain the effects of second-hand smoking on lung functions in athlete and non-athlete school-aged children.MethodsThis observational study included forty-six school-aged children, their age was 8–15 years, assigned to three groups; 2 study groups and 1 control group (n=15). The study groups comprised of 16 football players, and of 15 cyclists. Lung functions were evaluated recording forced vital capacity, forced expiratory volume in 1 sec and peak expiratory flow using digital spirometer.ResultsAll measures were recorded in definite values and the children were also classified into second-hand smoking (SH), or non-exposed to tobacco smoking (NE). The findings presented a significant increase (p<0.05) of the study groups in forced vital capacity, forced expiratory volume in 1 sec and peak expiratory flow solely for the non-exposed children. However, there were non-significant differences between the cyclists and football players or between the passive smoking children and non-exposed children in any of the two study groups (p>0.05).ConclusionThe outcomes of this study suggest beneficial influences of the sports activity on the lung functions, without different influences of the cyclists and football players on the lung functions.  相似文献   
36.
37.
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   
38.
39.
40.
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