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   2163174篇
  免费   150979篇
  国内免费   2848篇
耳鼻咽喉   29510篇
儿科学   70380篇
妇产科学   59061篇
基础医学   315007篇
口腔科学   60411篇
临床医学   197404篇
内科学   414363篇
皮肤病学   47903篇
神经病学   169105篇
特种医学   82273篇
外国民族医学   461篇
外科学   315845篇
综合类   44630篇
现状与发展   3篇
一般理论   781篇
预防医学   167098篇
眼科学   49337篇
药学   165458篇
  11篇
中国医学   4524篇
肿瘤学   123436篇
  2018年   22629篇
  2017年   17517篇
  2016年   19506篇
  2015年   22171篇
  2014年   30643篇
  2013年   45957篇
  2012年   62718篇
  2011年   66598篇
  2010年   38983篇
  2009年   37145篇
  2008年   62598篇
  2007年   66967篇
  2006年   67244篇
  2005年   65011篇
  2004年   62353篇
  2003年   59937篇
  2002年   57960篇
  2001年   104451篇
  2000年   106872篇
  1999年   89694篇
  1998年   23958篇
  1997年   21469篇
  1996年   21666篇
  1995年   20360篇
  1994年   18850篇
  1993年   17706篇
  1992年   69549篇
  1991年   67598篇
  1990年   66048篇
  1989年   63852篇
  1988年   58472篇
  1987年   57059篇
  1986年   54205篇
  1985年   51062篇
  1984年   38062篇
  1983年   32756篇
  1982年   18794篇
  1981年   16726篇
  1979年   35321篇
  1978年   24972篇
  1977年   21555篇
  1976年   19450篇
  1975年   21440篇
  1974年   25626篇
  1973年   25012篇
  1972年   23820篇
  1971年   22299篇
  1970年   20829篇
  1969年   19870篇
  1968年   18172篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
3.
4.
5.
6.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
7.
8.
Bulletin of Experimental Biology and Medicine - Ammonium, an end-product of catabolism, in low doses can promote adaptation of metabolic pathways in erythrocytes under conditions of extreme...  相似文献   
9.

Objectives

Expedient extubation after cardiac surgery has been associated with improved outcomes, leading to postoperative extubation frequently during overnight hours. However, recent evidence in a mixed medical-surgical intensive care unit population demonstrated worse outcomes with overnight extubation. This study investigated the impact of overnight extubation in a statewide, multicenter Society of Thoracic Surgeons database.

Methods

Records from 39,812 patients undergoing coronary artery bypass grafting or valve operations (2008-2016) and extubated within 24 hours were stratified according to extubation time between 06:00 and 18:00 (day) or between 18:00 and 6:00 (overnight). Outcomes including reintubation, mortality, and composite morbidity-mortality were evaluated using hierarchical regression models adjusted for Society of Thoracic Surgeons predictive risk scores. To further analyze extubation during the night, a subanalysis stratified patients into 3 groups: 06:00 to 18:00, 18:00 to 24:00, and 24:00 to 06:00.

Results

A total of 20,758 patients were extubated overnight (52.1%) and were slightly older (median age 66 vs 65 years, P < .001) with a longer duration of ventilation (4 vs 7 hours, P < .001). Day and overnight extubation were associated with equivalent operative mortality (1.7% vs 1.7%, P = .880), reintubation (3.7% vs 3.4%, P = .141), and composite morbidity-mortality (8.2% vs 8.0%, P = .314). After risk adjustment, overnight extubation was not associated with any difference in reintubation, mortality, or composite morbidity-mortality. On subanalysis, those extubated between 24:00 and 06:00 exhibited increased composite morbidity-mortality (odds ratio, 1.18; P = .001) but no difference in reintubation or mortality.

Conclusions

Extubation overnight was not associated with increased mortality or reintubation. These results suggest that in the appropriate clinical setting, it is safe to routinely extubate cardiac surgery patients overnight.  相似文献   
10.
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