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   3447901篇
  免费   291682篇
  国内免费   13592篇
耳鼻咽喉   48338篇
儿科学   111838篇
妇产科学   89275篇
基础医学   546789篇
口腔科学   90835篇
临床医学   307468篇
内科学   616804篇
皮肤病学   91134篇
神经病学   293835篇
特种医学   137288篇
外国民族医学   686篇
外科学   536221篇
综合类   102692篇
现状与发展   23篇
一般理论   2270篇
预防医学   289079篇
眼科学   78817篇
药学   237712篇
  23篇
中国医学   9654篇
肿瘤学   162394篇
  2021年   54956篇
  2020年   35028篇
  2019年   58066篇
  2018年   71167篇
  2017年   54205篇
  2016年   59802篇
  2015年   73963篇
  2014年   108110篇
  2013年   173277篇
  2012年   91800篇
  2011年   91690篇
  2010年   116570篇
  2009年   121152篇
  2008年   79667篇
  2007年   83062篇
  2006年   93729篇
  2005年   89275篇
  2004年   91422篇
  2003年   82563篇
  2002年   72772篇
  2001年   110020篇
  2000年   104082篇
  1999年   102879篇
  1998年   66072篇
  1997年   63493篇
  1996年   61439篇
  1995年   56888篇
  1994年   51143篇
  1993年   47677篇
  1992年   72815篇
  1991年   69875篇
  1990年   66378篇
  1989年   64844篇
  1988年   60005篇
  1987年   58803篇
  1986年   55199篇
  1985年   55207篇
  1984年   49831篇
  1983年   45397篇
  1982年   41899篇
  1981年   39669篇
  1980年   37189篇
  1979年   40812篇
  1978年   35728篇
  1977年   32697篇
  1976年   30039篇
  1975年   28948篇
  1974年   29661篇
  1973年   28570篇
  1972年   26525篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
Gattermann  J. 《Der Onkologe》2020,26(11):1010-1018
Die Onkologie - Die Corona-Pandemie hat in den letzten Monaten verdeutlicht, dass das Thema Sterblichkeit trotz erheblicher Fortschritte im Bereich der Hospiz- und Palliativversorgung zu...  相似文献   
112.
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   
113.
Introduction: Triple negative breast cancer (TNBC) is an aggressive breast cancer subtype associated with an increased risk of recurrence and cancer-related death. Unlike hormone receptor-positive or HER2-positive breast cancers, there are limited targeted therapies available to treat TNBC and cytotoxic chemotherapy remains the mainstay of treatment. Sacituzumab govitecan (IMMU-132) is an antibody-drug conjugate targeting Trop-2 expressing cells and selectively delivering SN-38, an active metabolite of irinotecan.

Areas covered: This review covers the mechanism of action, safety and efficacy of sacituzumab govitecan in patients with previously treated, metastatic TNBC. Additionally, efficacy data in other epithelial malignancies is included based on a PubMed search for ‘sacituzumab govitecan’ and ‘clinical trial’.

Expert opinion: Sacituzumab govitecan has promising anti-cancer activity in patients with metastatic TNBC previously treated with at least two prior lines of systemic therapy based on a single arm Phase I/II clinical trial. A confirmatory Phase III randomized clinical trial is ongoing. Sacituzumab govitecan has a manageable side effect profile, with the most common adverse events being nausea, neutropenia, and diarrhea. The activity of sacituzumab govitecan likely extends beyond TNBC with promising early efficacy data in many other epithelial cancers, including hormone receptor-positive breast cancer.  相似文献   

114.
115.

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   
116.
Erosive pustular dermatosis of the scalp (EPDS) is an uncommon chronic inflammatory response to scalp trauma that usually resolves with cicatricial alopecia. It most commonly affects elderly patients with a history of actinic damage. Herein, we describe a 16‐year‐old girl with acrofacial dysostosis type 1 presenting after surgery with crusting purulent scalp lesions, whose clinical presentation and histopathologic findings were consistent with EPDS. A review of the literature on EPDS in children is also detailed.  相似文献   
117.
118.
119.
120.
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