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   3389524篇
  免费   277379篇
  国内免费   14046篇
耳鼻咽喉   45782篇
儿科学   107848篇
妇产科学   85739篇
基础医学   540775篇
口腔科学   89801篇
临床医学   306942篇
内科学   594221篇
皮肤病学   90304篇
神经病学   292937篇
特种医学   132085篇
外国民族医学   339篇
外科学   521769篇
综合类   103091篇
现状与发展   23篇
一般理论   2507篇
预防医学   287823篇
眼科学   78297篇
药学   231202篇
  26篇
中国医学   9594篇
肿瘤学   159844篇
  2021年   56361篇
  2020年   35928篇
  2019年   59291篇
  2018年   72829篇
  2017年   55563篇
  2016年   61339篇
  2015年   75297篇
  2014年   110112篇
  2013年   176057篇
  2012年   100226篇
  2011年   101208篇
  2010年   119852篇
  2009年   123234篇
  2008年   86824篇
  2007年   90258篇
  2006年   100944篇
  2005年   95989篇
  2004年   97450篇
  2003年   87852篇
  2002年   76762篇
  2001年   95147篇
  2000年   87564篇
  1999年   89314篇
  1998年   65011篇
  1997年   62895篇
  1996年   60554篇
  1995年   56026篇
  1994年   50292篇
  1993年   46804篇
  1992年   62679篇
  1991年   59739篇
  1990年   56815篇
  1989年   56203篇
  1988年   51870篇
  1987年   51293篇
  1986年   48384篇
  1985年   48907篇
  1984年   45556篇
  1983年   41799篇
  1982年   40939篇
  1981年   38747篇
  1980年   36417篇
  1979年   37217篇
  1978年   33918篇
  1977年   31082篇
  1976年   28594篇
  1975年   26908篇
  1974年   27703篇
  1973年   26644篇
  1972年   24758篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
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   
22.
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   

23.
24.

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   
25.
26.
27.
28.
29.
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   
30.
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