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   2038842篇
  免费   166600篇
  国内免费   7721篇
耳鼻咽喉   27667篇
儿科学   63401篇
妇产科学   57152篇
基础医学   284276篇
口腔科学   57762篇
临床医学   183369篇
内科学   407014篇
皮肤病学   45935篇
神经病学   167746篇
特种医学   83079篇
外国民族医学   433篇
外科学   318276篇
综合类   51862篇
现状与发展   4篇
一般理论   685篇
预防医学   163723篇
眼科学   45850篇
药学   145809篇
  7篇
中国医学   3579篇
肿瘤学   105534篇
  2018年   19701篇
  2016年   18330篇
  2015年   20880篇
  2014年   29351篇
  2013年   44286篇
  2012年   55973篇
  2011年   59746篇
  2010年   36509篇
  2009年   35195篇
  2008年   55969篇
  2007年   60308篇
  2006年   61110篇
  2005年   59357篇
  2004年   57184篇
  2003年   55415篇
  2002年   52888篇
  2001年   91642篇
  2000年   94070篇
  1999年   78984篇
  1998年   24307篇
  1997年   21876篇
  1996年   22579篇
  1995年   22253篇
  1994年   20916篇
  1993年   19706篇
  1992年   66284篇
  1991年   64809篇
  1990年   62684篇
  1989年   59959篇
  1988年   55853篇
  1987年   55099篇
  1986年   52025篇
  1985年   50427篇
  1984年   38784篇
  1983年   32864篇
  1982年   20796篇
  1981年   18927篇
  1980年   17859篇
  1979年   36734篇
  1978年   26637篇
  1977年   22467篇
  1976年   20670篇
  1975年   21962篇
  1974年   26452篇
  1973年   25279篇
  1972年   23735篇
  1971年   21854篇
  1970年   20396篇
  1969年   19460篇
  1968年   17850篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
1.
2.
3.
4.
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   
5.

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   
6.
Metabolism describes the series of chemical reactions that are concerned with the provision of energy to biological systems. They may be divided into reactions involved in energy yield (catabolism: demand exceeds supply), and energy storage (anabolism: supply exceeds demand). Regulation of these pathways is critical for homeostasis, and derangements in metabolism are seen in a wide variety of pathological processes. Understanding metabolism is key to the treatment of many diseases, notably diabetes, as well as underpinning clinical nutritional support.  相似文献   
7.
8.
9.
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