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   2651357篇
  免费   191793篇
  国内免费   4991篇
耳鼻咽喉   34937篇
儿科学   87305篇
妇产科学   72855篇
基础医学   382318篇
口腔科学   76551篇
临床医学   242344篇
内科学   514276篇
皮肤病学   59339篇
神经病学   208450篇
特种医学   98799篇
外国民族医学   496篇
外科学   390066篇
综合类   59850篇
现状与发展   6篇
一般理论   1041篇
预防医学   208082篇
眼科学   62292篇
药学   194390篇
  12篇
中国医学   5871篇
肿瘤学   148861篇
  2019年   20895篇
  2018年   29560篇
  2017年   22419篇
  2016年   24657篇
  2015年   28238篇
  2014年   39238篇
  2013年   58482篇
  2012年   80580篇
  2011年   85258篇
  2010年   50108篇
  2009年   47318篇
  2008年   79812篇
  2007年   84928篇
  2006年   85219篇
  2005年   82043篇
  2004年   79138篇
  2003年   75515篇
  2002年   73085篇
  2001年   128314篇
  2000年   131232篇
  1999年   109514篇
  1998年   29817篇
  1997年   26423篇
  1996年   26720篇
  1995年   25439篇
  1994年   23508篇
  1993年   21857篇
  1992年   84325篇
  1991年   82089篇
  1990年   79171篇
  1989年   76544篇
  1988年   70174篇
  1987年   68713篇
  1986年   65053篇
  1985年   61517篇
  1984年   45977篇
  1983年   39601篇
  1982年   22837篇
  1979年   42069篇
  1978年   29835篇
  1977年   25244篇
  1976年   23516篇
  1975年   25006篇
  1974年   30411篇
  1973年   29658篇
  1972年   27684篇
  1971年   25763篇
  1970年   24181篇
  1969年   22724篇
  1968年   21169篇
排序方式: 共有10000条查询结果,搜索用时 15 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.
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   
6.
7.

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   
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