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   2609432篇
  免费   185855篇
  国内免费   7629篇
耳鼻咽喉   34559篇
儿科学   85627篇
妇产科学   71995篇
基础医学   366777篇
口腔科学   69992篇
临床医学   236524篇
内科学   520399篇
皮肤病学   62772篇
神经病学   215849篇
特种医学   100654篇
外国民族医学   738篇
外科学   389918篇
综合类   50517篇
现状与发展   5篇
一般理论   973篇
预防医学   197311篇
眼科学   57009篇
药学   189523篇
  8篇
中国医学   5407篇
肿瘤学   146359篇
  2021年   20313篇
  2019年   21009篇
  2018年   29748篇
  2017年   22943篇
  2016年   26598篇
  2015年   29983篇
  2014年   41107篇
  2013年   61330篇
  2012年   81600篇
  2011年   85941篇
  2010年   51931篇
  2009年   49941篇
  2008年   80383篇
  2007年   85254篇
  2006年   86938篇
  2005年   83174篇
  2004年   80086篇
  2003年   77409篇
  2002年   74667篇
  2001年   128684篇
  2000年   131543篇
  1999年   110775篇
  1998年   31577篇
  1997年   28198篇
  1996年   28443篇
  1995年   27612篇
  1994年   25254篇
  1993年   23612篇
  1992年   85334篇
  1991年   81725篇
  1990年   78900篇
  1989年   76177篇
  1988年   69581篇
  1987年   68106篇
  1986年   63662篇
  1985年   60608篇
  1984年   45042篇
  1983年   38044篇
  1982年   22563篇
  1981年   20069篇
  1979年   39032篇
  1978年   27481篇
  1977年   23315篇
  1976年   21537篇
  1975年   22866篇
  1974年   26825篇
  1973年   25427篇
  1972年   23777篇
  1971年   21988篇
  1970年   20199篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
81.
82.
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   
83.
84.
85.
86.
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   
87.
88.
89.
90.
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