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   2590083篇
  免费   184679篇
  国内免费   7579篇
耳鼻咽喉   34299篇
儿科学   85268篇
妇产科学   71622篇
基础医学   363926篇
口腔科学   69714篇
临床医学   234674篇
内科学   515942篇
皮肤病学   62563篇
神经病学   213757篇
特种医学   99925篇
外国民族医学   736篇
外科学   386593篇
综合类   50398篇
现状与发展   5篇
一般理论   969篇
预防医学   196367篇
眼科学   56689篇
药学   188150篇
  8篇
中国医学   5334篇
肿瘤学   145402篇
  2021年   20109篇
  2019年   20723篇
  2018年   29377篇
  2017年   22665篇
  2016年   26303篇
  2015年   29599篇
  2014年   40565篇
  2013年   60535篇
  2012年   80407篇
  2011年   84678篇
  2010年   51104篇
  2009年   49233篇
  2008年   79140篇
  2007年   83949篇
  2006年   85653篇
  2005年   81844篇
  2004年   78802篇
  2003年   76133篇
  2002年   73391篇
  2001年   128423篇
  2000年   131343篇
  1999年   110528篇
  1998年   31261篇
  1997年   27927篇
  1996年   28222篇
  1995年   27390篇
  1994年   25074篇
  1993年   23424篇
  1992年   85160篇
  1991年   81567篇
  1990年   78790篇
  1989年   76063篇
  1988年   69468篇
  1987年   67997篇
  1986年   63543篇
  1985年   60512篇
  1984年   44941篇
  1983年   37943篇
  1982年   22457篇
  1981年   19984篇
  1979年   38959篇
  1978年   27441篇
  1977年   23252篇
  1976年   21496篇
  1975年   22813篇
  1974年   26786篇
  1973年   25370篇
  1972年   23750篇
  1971年   21955篇
  1970年   20184篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
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   
84.
85.
86.
87.
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   
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