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   3195159篇
  免费   245184篇
  国内免费   5277篇
耳鼻咽喉   46783篇
儿科学   101158篇
妇产科学   84845篇
基础医学   451019篇
口腔科学   92632篇
临床医学   289401篇
内科学   615972篇
皮肤病学   68103篇
神经病学   263313篇
特种医学   127300篇
外国民族医学   1082篇
外科学   483546篇
综合类   72354篇
现状与发展   2篇
一般理论   1228篇
预防医学   248451篇
眼科学   75737篇
药学   243495篇
  11篇
中国医学   6481篇
肿瘤学   172707篇
  2018年   33644篇
  2017年   26196篇
  2016年   29256篇
  2015年   32422篇
  2014年   45643篇
  2013年   69554篇
  2012年   93875篇
  2011年   99501篇
  2010年   58538篇
  2009年   54913篇
  2008年   94113篇
  2007年   100466篇
  2006年   101484篇
  2005年   98301篇
  2004年   94593篇
  2003年   91452篇
  2002年   89872篇
  2001年   151353篇
  2000年   157254篇
  1999年   132048篇
  1998年   37161篇
  1997年   33428篇
  1996年   33078篇
  1995年   31695篇
  1994年   29615篇
  1993年   27698篇
  1992年   104374篇
  1991年   100611篇
  1990年   97495篇
  1989年   94178篇
  1988年   87099篇
  1987年   85455篇
  1986年   81000篇
  1985年   77308篇
  1984年   57974篇
  1983年   49250篇
  1982年   29378篇
  1981年   25955篇
  1979年   53875篇
  1978年   37451篇
  1977年   32256篇
  1976年   29563篇
  1975年   31851篇
  1974年   38716篇
  1973年   36809篇
  1972年   34611篇
  1971年   32180篇
  1970年   30216篇
  1969年   28349篇
  1968年   25654篇
排序方式: 共有10000条查询结果,搜索用时 718 毫秒
101.
102.
103.
104.
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   
105.
Caring for patients with end-stage kidney disease (ESKD) in the United States is challenging, due in part to the complex epidemiology of the disease's progression as well as the ways in which care is delivered. As CKD progresses toward ESKD, the number of comorbidities increases and care involves multiple healthcare providers from multiple subspecialties. This occurs in the context of a fragmented US healthcare delivery system that is traditionally siloed by provider specialty, organization, as well as systems of payment and administration. This article describes the role of care fragmentation in the delivery of optimal ESKD care and identifies research gaps in the evidence across the continuum of care. We then consider the impact of care fragmentation on ESKD care from the patient and health system perspectives and explore opportunities for system-level interventions aimed at improving care for patients with ESKD.  相似文献   
106.
107.
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   
108.
109.
110.
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   
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