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   1268966篇
  免费   94823篇
  国内免费   1593篇
耳鼻咽喉   16358篇
儿科学   41121篇
妇产科学   35000篇
基础医学   189922篇
口腔科学   34888篇
临床医学   118089篇
内科学   248924篇
皮肤病学   27325篇
神经病学   102194篇
特种医学   46953篇
外国民族医学   265篇
外科学   179453篇
综合类   25765篇
现状与发展   3篇
一般理论   568篇
预防医学   104939篇
眼科学   28108篇
药学   93074篇
  6篇
中国医学   2030篇
肿瘤学   70397篇
  2018年   13603篇
  2017年   10462篇
  2016年   11396篇
  2015年   13144篇
  2014年   18103篇
  2013年   27627篇
  2012年   37772篇
  2011年   40214篇
  2010年   23184篇
  2009年   22333篇
  2008年   37936篇
  2007年   40597篇
  2006年   40161篇
  2005年   39319篇
  2004年   37747篇
  2003年   36138篇
  2002年   35068篇
  2001年   56222篇
  2000年   57222篇
  1999年   48275篇
  1998年   13454篇
  1997年   12277篇
  1996年   12697篇
  1995年   11960篇
  1994年   11159篇
  1993年   10450篇
  1992年   38360篇
  1991年   37826篇
  1990年   36578篇
  1989年   35376篇
  1988年   32798篇
  1987年   32125篇
  1986年   30627篇
  1985年   28887篇
  1984年   21999篇
  1983年   19247篇
  1982年   11391篇
  1981年   10348篇
  1979年   20987篇
  1978年   15410篇
  1977年   12803篇
  1976年   11856篇
  1975年   12830篇
  1974年   15614篇
  1973年   15376篇
  1972年   14531篇
  1971年   13573篇
  1970年   12805篇
  1969年   12085篇
  1968年   11247篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
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   
2.
3.
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   
4.
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   
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.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
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