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   3562842篇
  免费   295597篇
  国内免费   14239篇
耳鼻咽喉   48211篇
儿科学   113217篇
妇产科学   92840篇
基础医学   565116篇
口腔科学   94226篇
临床医学   320218篇
内科学   636699篇
皮肤病学   93593篇
神经病学   306754篇
特种医学   138925篇
外国民族医学   490篇
外科学   545729篇
综合类   108048篇
现状与发展   24篇
一般理论   2380篇
预防医学   299232篇
眼科学   81211篇
药学   243575篇
  22篇
中国医学   10514篇
肿瘤学   171654篇
  2021年   55552篇
  2020年   35383篇
  2019年   58456篇
  2018年   72177篇
  2017年   55118篇
  2016年   60900篇
  2015年   74780篇
  2014年   109114篇
  2013年   174346篇
  2012年   101961篇
  2011年   102521篇
  2010年   118863篇
  2009年   123012篇
  2008年   89056篇
  2007年   92939篇
  2006年   103227篇
  2005年   98467篇
  2004年   99566篇
  2003年   89900篇
  2002年   79138篇
  2001年   118225篇
  2000年   111635篇
  1999年   107600篇
  1998年   66784篇
  1997年   64340篇
  1996年   62166篇
  1995年   57614篇
  1994年   51531篇
  1993年   48097篇
  1992年   74243篇
  1991年   69901篇
  1990年   65636篇
  1989年   64442篇
  1988年   59388篇
  1987年   58100篇
  1986年   54637篇
  1985年   54444篇
  1984年   49508篇
  1983年   45079篇
  1982年   42182篇
  1981年   39565篇
  1980年   37247篇
  1979年   40229篇
  1978年   35573篇
  1977年   32291篇
  1976年   29624篇
  1975年   27950篇
  1974年   29023篇
  1973年   28038篇
  1972年   26230篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
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   
52.
53.
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   
54.
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   

55.
56.

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   
57.
58.
59.
60.
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