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   3329858篇
  免费   244775篇
  国内免费   5392篇
耳鼻咽喉   47924篇
儿科学   105511篇
妇产科学   87825篇
基础医学   461661篇
口腔科学   92996篇
临床医学   296783篇
内科学   643145篇
皮肤病学   68255篇
神经病学   274539篇
特种医学   132801篇
外国民族医学   1082篇
外科学   503426篇
综合类   74466篇
现状与发展   2篇
一般理论   1216篇
预防医学   266084篇
眼科学   78024篇
药学   251858篇
  11篇
中国医学   7231篇
肿瘤学   185185篇
  2018年   52739篇
  2017年   40548篇
  2016年   45114篇
  2015年   33291篇
  2014年   46460篇
  2013年   69859篇
  2012年   100568篇
  2011年   117465篇
  2010年   74082篇
  2009年   64593篇
  2008年   109550篇
  2007年   117859篇
  2006年   101430篇
  2005年   99645篇
  2004年   97132篇
  2003年   94353篇
  2002年   90955篇
  2001年   150440篇
  2000年   155953篇
  1999年   131374篇
  1998年   36816篇
  1997年   33089篇
  1996年   32774篇
  1995年   31424篇
  1994年   29376篇
  1993年   27431篇
  1992年   104406篇
  1991年   100794篇
  1990年   97704篇
  1989年   94280篇
  1988年   87201篇
  1987年   85509篇
  1986年   81113篇
  1985年   77257篇
  1984年   57828篇
  1983年   49171篇
  1982年   29134篇
  1981年   25748篇
  1979年   53873篇
  1978年   37365篇
  1977年   32123篇
  1976年   29490篇
  1975年   31790篇
  1974年   38789篇
  1973年   36876篇
  1972年   34699篇
  1971年   32239篇
  1970年   30329篇
  1969年   28464篇
  1968年   25739篇
排序方式: 共有10000条查询结果,搜索用时 15 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