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   4039354篇
  免费   319927篇
  国内免费   14862篇
耳鼻咽喉   56557篇
儿科学   131109篇
妇产科学   107140篇
基础医学   623631篇
口腔科学   110974篇
临床医学   362294篇
内科学   723540篇
皮肤病学   102457篇
神经病学   337757篇
特种医学   159489篇
外国民族医学   675篇
外科学   620934篇
综合类   118673篇
现状与发展   23篇
一般理论   2447篇
预防医学   336904篇
眼科学   93974篇
药学   281629篇
  24篇
中国医学   10988篇
肿瘤学   192924篇
  2021年   55700篇
  2020年   35556篇
  2019年   58664篇
  2018年   73250篇
  2017年   55927篇
  2016年   61837篇
  2015年   75407篇
  2014年   109916篇
  2013年   175596篇
  2012年   107709篇
  2011年   111110篇
  2010年   122024篇
  2009年   124711篇
  2008年   98467篇
  2007年   104297篇
  2006年   114133篇
  2005年   109424篇
  2004年   111068篇
  2003年   101943篇
  2002年   91866篇
  2001年   136322篇
  2000年   130201篇
  1999年   123722篇
  1998年   69119篇
  1997年   65719篇
  1996年   63722篇
  1995年   59124篇
  1994年   53468篇
  1993年   49512篇
  1992年   90926篇
  1991年   87895篇
  1990年   85038篇
  1989年   83316篇
  1988年   77306篇
  1987年   76016篇
  1986年   72041篇
  1985年   71314篇
  1984年   61111篇
  1983年   54951篇
  1982年   46193篇
  1981年   43073篇
  1980年   40516篇
  1979年   53023篇
  1978年   43962篇
  1977年   39395篇
  1976年   36599篇
  1975年   36524篇
  1974年   39653篇
  1973年   38252篇
  1972年   35789篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
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   
82.
83.
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   
84.
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   

85.
86.

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   
87.
88.
89.
90.
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