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   2620160篇
  免费   190445篇
  国内免费   7632篇
耳鼻咽喉   34640篇
儿科学   86098篇
妇产科学   72339篇
基础医学   368400篇
口腔科学   70404篇
临床医学   238796篇
内科学   522066篇
皮肤病学   62956篇
神经病学   216644篇
特种医学   101170篇
外国民族医学   736篇
外科学   391691篇
综合类   50924篇
现状与发展   5篇
一般理论   1018篇
预防医学   199510篇
眼科学   57437篇
药学   190623篇
  8篇
中国医学   5363篇
肿瘤学   147409篇
  2021年   20700篇
  2019年   21329篇
  2018年   30079篇
  2017年   23163篇
  2016年   26851篇
  2015年   30201篇
  2014年   41551篇
  2013年   61937篇
  2012年   82696篇
  2011年   86886篇
  2010年   52405篇
  2009年   50319篇
  2008年   81130篇
  2007年   86154篇
  2006年   87693篇
  2005年   83859篇
  2004年   80785篇
  2003年   77976篇
  2002年   75149篇
  2001年   128915篇
  2000年   131788篇
  1999年   110991篇
  1998年   31671篇
  1997年   28288篇
  1996年   28494篇
  1995年   27686篇
  1994年   25272篇
  1993年   23622篇
  1992年   85485篇
  1991年   81901篇
  1990年   79102篇
  1989年   76432篇
  1988年   69794篇
  1987年   68274篇
  1986年   63842篇
  1985年   60782篇
  1984年   45182篇
  1983年   38186篇
  1982年   22634篇
  1981年   20153篇
  1979年   39128篇
  1978年   27574篇
  1977年   23370篇
  1976年   21606篇
  1975年   22915篇
  1974年   26912篇
  1973年   25500篇
  1972年   23866篇
  1971年   22080篇
  1970年   20277篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
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   
152.
153.
154.
155.
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   
156.
157.
Hypertrophic lichen planus (HLP) is a T‐cell‐mediated process typically presenting with hypertrophic or verrucous plaques on the lower limbs. We report the case of a 24‐year‐old woman with a history of HLP since age 3 years presenting with rapid malignant transformation of one lesion into a large squamous cell carcinoma (SCC). Subsequent examination revealed progressive, widespread metastatic involvement, and the patient ultimately died from her disease. SCC associated with HLP is rare, with a review of the literature revealing fewer than 50 cases. This case highlights the need to be aware of suspicious changes in HLP and to educate patients as to when to be reevaluated.  相似文献   
158.
159.
160.
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