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   2497280篇
  免费   206357篇
  国内免费   4762篇
耳鼻咽喉   36046篇
儿科学   76299篇
妇产科学   65567篇
基础医学   351328篇
口腔科学   70220篇
临床医学   228244篇
内科学   494445篇
皮肤病学   50242篇
神经病学   213790篇
特种医学   100178篇
外国民族医学   895篇
外科学   378158篇
综合类   57998篇
现状与发展   4篇
一般理论   1157篇
预防医学   200523篇
眼科学   59111篇
药学   185580篇
  4篇
中国医学   4506篇
肿瘤学   134104篇
  2018年   26459篇
  2017年   20388篇
  2016年   22516篇
  2015年   25651篇
  2014年   36965篇
  2013年   56460篇
  2012年   76531篇
  2011年   80758篇
  2010年   47175篇
  2009年   45304篇
  2008年   76750篇
  2007年   81696篇
  2006年   82194篇
  2005年   80511篇
  2004年   77602篇
  2003年   74846篇
  2002年   73805篇
  2001年   113486篇
  2000年   117319篇
  1999年   99453篇
  1998年   29558篇
  1997年   26944篇
  1996年   26678篇
  1995年   25739篇
  1994年   24163篇
  1993年   22531篇
  1992年   80102篇
  1991年   77070篇
  1990年   74155篇
  1989年   71416篇
  1988年   66432篇
  1987年   65310篇
  1986年   61930篇
  1985年   59066篇
  1984年   45111篇
  1983年   38505篇
  1982年   24095篇
  1981年   21473篇
  1980年   20109篇
  1979年   41882篇
  1978年   29678篇
  1977年   24972篇
  1976年   23379篇
  1975年   24383篇
  1974年   30107篇
  1973年   28394篇
  1972年   26522篇
  1971年   24363篇
  1970年   22938篇
  1969年   21250篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
132.
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   
133.
134.
135.
136.
137.
138.
139.
140.
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   
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