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   3433438篇
  免费   250208篇
  国内免费   9233篇
耳鼻咽喉   46436篇
儿科学   113202篇
妇产科学   95751篇
基础医学   481827篇
口腔科学   94766篇
临床医学   314778篇
内科学   673849篇
皮肤病学   81398篇
神经病学   282424篇
特种医学   130831篇
外国民族医学   1111篇
外科学   512456篇
综合类   74153篇
现状与发展   7篇
一般理论   1335篇
预防医学   267579篇
眼科学   77716篇
药学   248381篇
  10篇
中国医学   7288篇
肿瘤学   187581篇
  2019年   27486篇
  2018年   38499篇
  2017年   29557篇
  2016年   33964篇
  2015年   38255篇
  2014年   53286篇
  2013年   80004篇
  2012年   106751篇
  2011年   113248篇
  2010年   67866篇
  2009年   64762篇
  2008年   105244篇
  2007年   111677篇
  2006年   113520篇
  2005年   109227篇
  2004年   104768篇
  2003年   101027篇
  2002年   97596篇
  2001年   165424篇
  2000年   169463篇
  1999年   142508篇
  1998年   41214篇
  1997年   36703篇
  1996年   36723篇
  1995年   35510篇
  1994年   32426篇
  1993年   30344篇
  1992年   110017篇
  1991年   105617篇
  1990年   102349篇
  1989年   98589篇
  1988年   90440篇
  1987年   88604篇
  1986年   82991篇
  1985年   79413篇
  1984年   59548篇
  1983年   50476篇
  1982年   30182篇
  1981年   26908篇
  1979年   52633篇
  1978年   37252篇
  1977年   31396篇
  1976年   29247篇
  1975年   30835篇
  1974年   36713篇
  1973年   35102篇
  1972年   32988篇
  1971年   30514篇
  1970年   28347篇
  1969年   26991篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.
BackgroundThe aim of this paper is to assess the current state of quality and outcomes measures being reported for hepatic resections in the recent literature.MethodsMedline and PubMed databases were searched for English language articles published between 1 January 2002 and 30 April 2013. Two examiners reviewed each article and relevant citations for appropriateness of inclusion, which excluded papers of liver donor hepatic resections, repeat hepatectomies or meta-analyses. Data were extracted and summarized by two examiners for analysis.ResultsFifty-five studies were identified with suitable reporting to assess peri-operative mortality in hepatic resections. In only 35% (19/55) of the studies was the follow-up time explicitly stated, and in 47% (26/55) of studies peri-operative mortality was limited to in-hospital or 30 days. The time period in which complications were captured was not explicitly stated in 19 out of 28 studies. The remaining studies only captured complications within 30 days of the index operation (8/28). There was a paucity of quality literature addressing truly patient-centred outcomes.ConclusionQuality outcomes after a hepatic resection are inconsistently reported in the literature. Quality outcome studies for a hepatectomy should report mortality and morbidity at a minimum of 90 days after surgery.  相似文献   
73.
74.
75.
76.
Objective: Report measured resting energy expenditure (REE) in wheelchair rugby athletes and evaluate agreement between REE and the prediction models of Chun, Cunningham, Harris-Benedict, Mifflin, Nightingale and Gorgey, and Owen.

Design: Cohort-based validation study.

Setting. Paralympic team training camp.

Participants: Fourteen internationally competitive athletes who play wheelchair rugby, 13 of whom had cervical spinal cord injuries (SCI).

Outcome Measures: A portable metabolic analyzer was used to measure REE following an overnight fast and dual-energy X-ray absorptiometry (DXA) was used to assess lean body mass for the prediction equations.

Results: REE in the current sample was 1735?±?257?kcal?×?day?1 ranging from 1324 to 2068?kcal?×?day?1 Bhambhani Y. Physiology of wheelchair racing in athletes with spinal cord injury. Sports Med 2002;32(1):2351.[Crossref], [PubMed], [Web of Science ®] [Google Scholar]. Bland–Altman analyses revealed negative mean bias but similar limits of agreement between measured REE and scores predicted by Chun, Cunningham, Mifflin, Nightingale and Gorgey, and Owen models in elite athletes who play wheelchair rugby.

Conclusion: Prediction models regressed on persons with and without SCI under-predicted REE of competitive wheelchair rugby athletes. This outcome may be explained by the higher REE/fat-free mass (FFM) ratio of current athletes compared to less active samples. Findings from the current study will help practitioners to determine nutrient intake needs on training days of varied intensity.  相似文献   
77.
78.
79.
80.
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