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   2655749篇
  免费   192134篇
  国内免费   4992篇
耳鼻咽喉   34940篇
儿科学   87429篇
妇产科学   72962篇
基础医学   382995篇
口腔科学   76733篇
临床医学   242846篇
内科学   515070篇
皮肤病学   59417篇
神经病学   208936篇
特种医学   98865篇
外国民族医学   496篇
外科学   390558篇
综合类   59960篇
现状与发展   6篇
一般理论   1051篇
预防医学   208553篇
眼科学   62353篇
药学   194709篇
  12篇
中国医学   5886篇
肿瘤学   149098篇
  2019年   20977篇
  2018年   29631篇
  2017年   22472篇
  2016年   24720篇
  2015年   28310篇
  2014年   39326篇
  2013年   58632篇
  2012年   80805篇
  2011年   85489篇
  2010年   50252篇
  2009年   47411篇
  2008年   80015篇
  2007年   85126篇
  2006年   85406篇
  2005年   82230篇
  2004年   79287篇
  2003年   75711篇
  2002年   73227篇
  2001年   128402篇
  2000年   131349篇
  1999年   109598篇
  1998年   29859篇
  1997年   26469篇
  1996年   26737篇
  1995年   25481篇
  1994年   23531篇
  1993年   21885篇
  1992年   84385篇
  1991年   82196篇
  1990年   79234篇
  1989年   76640篇
  1988年   70280篇
  1987年   68839篇
  1986年   65149篇
  1985年   61643篇
  1984年   46048篇
  1983年   39645篇
  1982年   22870篇
  1979年   42127篇
  1978年   29894篇
  1977年   25293篇
  1976年   23554篇
  1975年   25044篇
  1974年   30452篇
  1973年   29694篇
  1972年   27725篇
  1971年   25796篇
  1970年   24212篇
  1969年   22745篇
  1968年   21198篇
排序方式: 共有10000条查询结果,搜索用时 0 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