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   2809739篇
  免费   202938篇
  国内免费   21641篇
耳鼻咽喉   36251篇
儿科学   87935篇
妇产科学   75978篇
基础医学   388914篇
口腔科学   73519篇
临床医学   263578篇
内科学   550583篇
皮肤病学   64902篇
神经病学   225559篇
特种医学   107693篇
外国民族医学   832篇
外科学   410389篇
综合类   83674篇
现状与发展   53篇
一般理论   1008篇
预防医学   210118篇
眼科学   62920篇
药学   210676篇
  172篇
中国医学   16102篇
肿瘤学   163462篇
  2021年   30875篇
  2020年   20583篇
  2019年   27776篇
  2018年   36774篇
  2017年   29172篇
  2016年   32479篇
  2015年   39045篇
  2014年   52431篇
  2013年   71562篇
  2012年   96604篇
  2011年   102553篇
  2010年   62095篇
  2009年   57978篇
  2008年   90866篇
  2007年   95660篇
  2006年   96984篇
  2005年   93352篇
  2004年   86648篇
  2003年   83044篇
  2002年   79353篇
  2001年   132979篇
  2000年   136019篇
  1999年   115834篇
  1998年   34652篇
  1997年   31359篇
  1996年   30821篇
  1995年   29802篇
  1994年   27149篇
  1993年   24812篇
  1992年   86886篇
  1991年   83064篇
  1990年   80072篇
  1989年   77171篇
  1988年   70449篇
  1987年   68871篇
  1986年   64244篇
  1985年   61056篇
  1984年   45296篇
  1983年   38208篇
  1982年   22613篇
  1979年   39131篇
  1978年   27531篇
  1977年   23329篇
  1976年   21562篇
  1975年   22874篇
  1974年   26865篇
  1973年   25441篇
  1972年   23805篇
  1971年   22006篇
  1970年   20236篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
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   
104.
105.
106.
107.
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   
108.
109.
110.
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