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   931295篇
  免费   67558篇
  国内免费   1340篇
耳鼻咽喉   12959篇
儿科学   24413篇
妇产科学   23242篇
基础医学   132971篇
口腔科学   28247篇
临床医学   80555篇
内科学   183411篇
皮肤病学   19226篇
神经病学   72229篇
特种医学   36812篇
外国民族医学   79篇
外科学   152094篇
综合类   18042篇
现状与发展   1篇
一般理论   235篇
预防医学   61782篇
眼科学   21310篇
药学   72635篇
  3篇
中国医学   2199篇
肿瘤学   57748篇
  2018年   8970篇
  2017年   7029篇
  2016年   7776篇
  2015年   8871篇
  2014年   12004篇
  2013年   17527篇
  2012年   24127篇
  2011年   25067篇
  2010年   14822篇
  2009年   14279篇
  2008年   24637篇
  2007年   25721篇
  2006年   26518篇
  2005年   25469篇
  2004年   24580篇
  2003年   23634篇
  2002年   23174篇
  2001年   54749篇
  2000年   56567篇
  1999年   46975篇
  1998年   10738篇
  1997年   9471篇
  1996年   9600篇
  1995年   8937篇
  1994年   8285篇
  1993年   7599篇
  1992年   35505篇
  1991年   33925篇
  1990年   32745篇
  1989年   31885篇
  1988年   29005篇
  1987年   28259篇
  1986年   26299篇
  1985年   25154篇
  1984年   17837篇
  1983年   15141篇
  1982年   7800篇
  1981年   6772篇
  1979年   15783篇
  1978年   10601篇
  1977年   9052篇
  1976年   7871篇
  1975年   8629篇
  1974年   10466篇
  1973年   9860篇
  1972年   9359篇
  1971年   8853篇
  1970年   8427篇
  1969年   7923篇
  1968年   7201篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
1.
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional...  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.

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   
5.
6.
7.
8.
9.
Acne vulgaris (acne) is a chronic inflammatory disease of the sebaceous gland, characterized by follicular hyperkeratinization, excessive colonization by Propionibacterium acnes (Pacnes) as well as immune reactions and inflammation. Despite an armamentarium of topical treatments available including benzoyl peroxide, retinoids and azelaic acid, topical antibiotics in monotherapies, especially erythromycin and clindamycin, are still used in Europe to treat acne. This intensive use led to antimicrobial‐resistant P. acnes and staphylococci strains becoming one of the main health issues worldwide. This is an update on the current topical acne treatments available in Europe, their mechanism of action, their potential to induce antimicrobial resistance and their clinical efficacy and safety.  相似文献   
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