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   2973655篇
  免费   254974篇
  国内免费   13504篇
耳鼻咽喉   41298篇
儿科学   93337篇
妇产科学   73723篇
基础医学   480831篇
口腔科学   78278篇
临床医学   283346篇
内科学   509413篇
皮肤病学   87229篇
神经病学   253791篇
特种医学   116784篇
外国民族医学   79篇
外科学   474489篇
综合类   88078篇
现状与发展   97篇
一般理论   2081篇
预防医学   252529篇
眼科学   68516篇
药学   195106篇
  22篇
中国医学   8621篇
肿瘤学   134485篇
  2022年   23125篇
  2021年   55708篇
  2020年   37696篇
  2019年   58484篇
  2018年   74328篇
  2017年   57820篇
  2016年   63264篇
  2015年   77793篇
  2014年   114447篇
  2013年   179749篇
  2012年   79257篇
  2011年   78316篇
  2010年   118185篇
  2009年   124660篇
  2008年   64872篇
  2007年   65837篇
  2006年   77530篇
  2005年   72369篇
  2004年   73997篇
  2003年   65142篇
  2002年   55181篇
  2001年   73719篇
  2000年   64716篇
  1999年   71173篇
  1998年   63597篇
  1997年   61809篇
  1996年   59208篇
  1995年   54521篇
  1994年   48179篇
  1993年   45097篇
  1992年   47150篇
  1991年   46469篇
  1990年   43994篇
  1989年   44164篇
  1988年   40945篇
  1987年   40088篇
  1986年   37940篇
  1985年   38835篇
  1984年   38437篇
  1983年   36069篇
  1982年   37940篇
  1981年   36136篇
  1980年   34224篇
  1979年   30593篇
  1978年   29388篇
  1977年   27252篇
  1976年   25406篇
  1975年   24412篇
  1974年   23755篇
  1973年   22718篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
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   
23.
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   

24.
25.

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   
26.
27.
28.
29.
30.
Metabolism describes the series of chemical reactions that are concerned with the provision of energy to biological systems. They may be divided into reactions involved in energy yield (catabolism: demand exceeds supply), and energy storage (anabolism: supply exceeds demand). Regulation of these pathways is critical for homeostasis, and derangements in metabolism are seen in a wide variety of pathological processes. Understanding metabolism is key to the treatment of many diseases, notably diabetes, as well as underpinning clinical nutritional support.  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