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   1380769篇
  免费   84458篇
  国内免费   9403篇
耳鼻咽喉   17328篇
儿科学   42647篇
妇产科学   34056篇
基础医学   187744篇
口腔科学   33047篇
临床医学   123422篇
内科学   255731篇
皮肤病学   26527篇
神经病学   105052篇
特种医学   56396篇
外国民族医学   271篇
外科学   207421篇
综合类   42942篇
现状与发展   26篇
一般理论   268篇
预防医学   100227篇
眼科学   30762篇
药学   108567篇
  123篇
中国医学   9352篇
肿瘤学   92721篇
  2021年   13347篇
  2020年   9085篇
  2019年   11734篇
  2018年   37587篇
  2017年   30334篇
  2016年   34301篇
  2015年   17339篇
  2014年   22422篇
  2013年   28838篇
  2012年   45901篇
  2011年   62939篇
  2010年   43407篇
  2009年   34335篇
  2008年   57059篇
  2007年   62605篇
  2006年   39493篇
  2005年   40120篇
  2004年   38255篇
  2003年   38525篇
  2002年   34607篇
  2001年   63246篇
  2000年   65093篇
  1999年   54325篇
  1998年   14892篇
  1997年   13440篇
  1996年   12717篇
  1995年   11924篇
  1994年   10762篇
  1993年   9805篇
  1992年   39005篇
  1991年   37411篇
  1990年   36751篇
  1989年   35131篇
  1988年   31597篇
  1987年   30683篇
  1986年   28762篇
  1985年   26958篇
  1984年   19469篇
  1983年   16345篇
  1982年   9026篇
  1979年   17212篇
  1978年   11513篇
  1977年   10270篇
  1975年   10104篇
  1974年   11735篇
  1973年   11311篇
  1972年   10772篇
  1971年   10110篇
  1970年   9299篇
  1969年   8997篇
排序方式: 共有10000条查询结果,搜索用时 20 毫秒
51.
52.
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   
53.
54.
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   
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.
60.
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