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   3117566篇
  免费   241109篇
  国内免费   5215篇
耳鼻咽喉   45462篇
儿科学   98218篇
妇产科学   82878篇
基础医学   439155篇
口腔科学   89814篇
临床医学   282506篇
内科学   602880篇
皮肤病学   65766篇
神经病学   255251篇
特种医学   124160篇
外国民族医学   1082篇
外科学   472296篇
综合类   71990篇
现状与发展   2篇
一般理论   1195篇
预防医学   243893篇
眼科学   73898篇
药学   237905篇
  11篇
中国医学   6379篇
肿瘤学   169149篇
  2018年   31815篇
  2017年   24617篇
  2016年   27333篇
  2015年   30757篇
  2014年   43880篇
  2013年   66138篇
  2012年   89627篇
  2011年   94686篇
  2010年   55911篇
  2009年   53215篇
  2008年   89290篇
  2007年   95439篇
  2006年   96694篇
  2005年   93531篇
  2004年   90107篇
  2003年   86906篇
  2002年   85456篇
  2001年   149139篇
  2000年   154469篇
  1999年   130349篇
  1998年   36437篇
  1997年   32822篇
  1996年   32596篇
  1995年   31250篇
  1994年   29209篇
  1993年   27311篇
  1992年   104000篇
  1991年   100299篇
  1990年   97189篇
  1989年   93859篇
  1988年   86825篇
  1987年   85148篇
  1986年   80775篇
  1985年   76924篇
  1984年   57558篇
  1983年   48920篇
  1982年   29016篇
  1981年   25644篇
  1979年   53583篇
  1978年   37187篇
  1977年   31971篇
  1976年   29340篇
  1975年   31607篇
  1974年   38486篇
  1973年   36615篇
  1972年   34469篇
  1971年   32020篇
  1970年   30069篇
  1969年   28214篇
  1968年   25514篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
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   
95.
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   
96.
97.
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   
98.
99.
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   
100.
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