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   1384262篇
  免费   100343篇
  国内免费   1675篇
耳鼻咽喉   18329篇
儿科学   45070篇
妇产科学   37781篇
基础医学   207214篇
口腔科学   38551篇
临床医学   127926篇
内科学   269310篇
皮肤病学   30735篇
神经病学   114288篇
特种医学   52000篇
外国民族医学   265篇
外科学   196847篇
综合类   26273篇
现状与发展   3篇
一般理论   606篇
预防医学   111405篇
眼科学   30593篇
药学   100790篇
  6篇
中国医学   2207篇
肿瘤学   76081篇
  2019年   11281篇
  2018年   16165篇
  2017年   12666篇
  2016年   14249篇
  2015年   15545篇
  2014年   20747篇
  2013年   32436篇
  2012年   43807篇
  2011年   47069篇
  2010年   27047篇
  2009年   24925篇
  2008年   44936篇
  2007年   47959篇
  2006年   47324篇
  2005年   46322篇
  2004年   44326篇
  2003年   42786篇
  2002年   41540篇
  2001年   60124篇
  2000年   62197篇
  1999年   50986篇
  1998年   14651篇
  1997年   13235篇
  1996年   13447篇
  1995年   12562篇
  1994年   11728篇
  1993年   10997篇
  1992年   38784篇
  1991年   38165篇
  1990年   36923篇
  1989年   35748篇
  1988年   33116篇
  1987年   32504篇
  1986年   30924篇
  1985年   29349篇
  1984年   22500篇
  1983年   19670篇
  1982年   11860篇
  1979年   21347篇
  1978年   15762篇
  1977年   13182篇
  1976年   12198篇
  1975年   13149篇
  1974年   15915篇
  1973年   15634篇
  1972年   14740篇
  1971年   13793篇
  1970年   13006篇
  1969年   12251篇
  1968年   11431篇
排序方式: 共有10000条查询结果,搜索用时 15 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.
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   
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.
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