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   4261317篇
  免费   340382篇
  国内免费   14473篇
耳鼻咽喉   58997篇
儿科学   132034篇
妇产科学   111634篇
基础医学   651505篇
口腔科学   121191篇
临床医学   381067篇
内科学   768447篇
皮肤病学   104934篇
神经病学   356825篇
特种医学   169505篇
外国民族医学   564篇
外科学   659317篇
综合类   124980篇
现状与发展   23篇
一般理论   2514篇
预防医学   347265篇
眼科学   99765篇
药学   303327篇
  24篇
中国医学   11549篇
肿瘤学   210705篇
  2021年   55475篇
  2019年   58323篇
  2018年   72759篇
  2017年   55592篇
  2016年   61524篇
  2015年   75138篇
  2014年   109507篇
  2013年   174704篇
  2012年   110629篇
  2011年   113215篇
  2010年   121779篇
  2009年   124771篇
  2008年   101224篇
  2007年   106416篇
  2006年   116536篇
  2005年   111538篇
  2004年   113718篇
  2003年   103844篇
  2002年   93779篇
  2001年   157543篇
  2000年   153523篇
  1999年   142729篇
  1998年   70751篇
  1997年   67163篇
  1996年   65135篇
  1995年   60645篇
  1994年   54647篇
  1993年   50915篇
  1992年   106563篇
  1991年   102212篇
  1990年   98119篇
  1989年   96183篇
  1988年   89017篇
  1987年   87340篇
  1986年   82827篇
  1985年   82021篇
  1984年   68032篇
  1983年   60857篇
  1982年   48491篇
  1981年   45025篇
  1980年   42248篇
  1979年   59607篇
  1978年   47482篇
  1977年   42482篇
  1976年   38946篇
  1975年   38752篇
  1974年   42835篇
  1973年   41110篇
  1972年   38380篇
  1971年   35776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.
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   
53.
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   

54.
55.

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   
56.
57.
58.
59.
60.
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