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   3485644篇
  免费   288257篇
  国内免费   13710篇
耳鼻咽喉   48659篇
儿科学   112501篇
妇产科学   89775篇
基础医学   550960篇
口腔科学   91299篇
临床医学   310553篇
内科学   624370篇
皮肤病学   91442篇
神经病学   296968篇
特种医学   138360篇
外国民族医学   686篇
外科学   541122篇
综合类   103101篇
现状与发展   23篇
一般理论   2312篇
预防医学   291385篇
眼科学   79433篇
药学   239816篇
  23篇
中国医学   9699篇
肿瘤学   165124篇
  2021年   55384篇
  2020年   35286篇
  2019年   58380篇
  2018年   71781篇
  2017年   54630篇
  2016年   60245篇
  2015年   74407篇
  2014年   108661篇
  2013年   173989篇
  2012年   95054篇
  2011年   95084篇
  2010年   117661篇
  2009年   121952篇
  2008年   82669篇
  2007年   86348篇
  2006年   96787篇
  2005年   92319篇
  2004年   94120篇
  2003年   85114篇
  2002年   75076篇
  2001年   110139篇
  2000年   104149篇
  1999年   102961篇
  1998年   66219篇
  1997年   63602篇
  1996年   61530篇
  1995年   56980篇
  1994年   51210篇
  1993年   47742篇
  1992年   72865篇
  1991年   69914篇
  1990年   66407篇
  1989年   64881篇
  1988年   60028篇
  1987年   58830篇
  1986年   55224篇
  1985年   55237篇
  1984年   49852篇
  1983年   45419篇
  1982年   41915篇
  1981年   39692篇
  1980年   37204篇
  1979年   40820篇
  1978年   35737篇
  1977年   32713篇
  1976年   30051篇
  1975年   28959篇
  1974年   29677篇
  1973年   28584篇
  1972年   26528篇
排序方式: 共有10000条查询结果,搜索用时 15 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