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   1285275篇
  免费   96553篇
  国内免费   1622篇
耳鼻咽喉   16585篇
儿科学   41780篇
妇产科学   35537篇
基础医学   192417篇
口腔科学   34981篇
临床医学   120941篇
内科学   251833篇
皮肤病学   27503篇
神经病学   103578篇
特种医学   47312篇
外国民族医学   266篇
外科学   180798篇
综合类   26131篇
现状与发展   3篇
一般理论   593篇
预防医学   107345篇
眼科学   28273篇
药学   93947篇
  6篇
中国医学   2038篇
肿瘤学   71583篇
  2019年   10484篇
  2018年   14029篇
  2017年   10808篇
  2016年   11736篇
  2015年   13512篇
  2014年   18576篇
  2013年   28450篇
  2012年   38941篇
  2011年   41424篇
  2010年   23817篇
  2009年   22935篇
  2008年   38964篇
  2007年   41664篇
  2006年   41183篇
  2005年   40285篇
  2004年   38624篇
  2003年   36987篇
  2002年   35832篇
  2001年   56454篇
  2000年   57488篇
  1999年   48492篇
  1998年   13622篇
  1997年   12443篇
  1996年   12810篇
  1995年   12125篇
  1994年   11258篇
  1993年   10537篇
  1992年   38466篇
  1991年   37942篇
  1990年   36685篇
  1989年   35531篇
  1988年   32905篇
  1987年   32244篇
  1986年   30733篇
  1985年   29007篇
  1984年   22094篇
  1983年   19314篇
  1982年   11476篇
  1979年   21098篇
  1978年   15506篇
  1977年   12875篇
  1976年   11929篇
  1975年   12886篇
  1974年   15675篇
  1973年   15439篇
  1972年   14585篇
  1971年   13630篇
  1970年   12848篇
  1969年   12127篇
  1968年   11290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.
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.
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   
6.

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   
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