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   2910860篇
  免费   243303篇
  国内免费   12934篇
耳鼻咽喉   40000篇
儿科学   91840篇
妇产科学   73061篇
基础医学   479057篇
口腔科学   77993篇
临床医学   260588篇
内科学   496661篇
皮肤病学   83004篇
神经病学   249798篇
特种医学   113539篇
外国民族医学   88篇
外科学   458278篇
综合类   88485篇
现状与发展   23篇
一般理论   2098篇
预防医学   248439篇
眼科学   66459篇
药学   196499篇
  22篇
中国医学   8579篇
肿瘤学   132586篇
  2022年   22908篇
  2021年   54612篇
  2020年   34826篇
  2019年   57809篇
  2018年   69903篇
  2017年   53158篇
  2016年   58423篇
  2015年   73126篇
  2014年   107220篇
  2013年   172195篇
  2012年   75386篇
  2011年   73568篇
  2010年   112499篇
  2009年   117894篇
  2008年   61294篇
  2007年   62215篇
  2006年   73952篇
  2005年   69729篇
  2004年   71971篇
  2003年   63307篇
  2002年   53592篇
  2001年   74494篇
  2000年   66608篇
  1999年   72088篇
  1998年   62036篇
  1997年   60496篇
  1996年   58311篇
  1995年   53761篇
  1994年   47887篇
  1993年   44872篇
  1992年   48212篇
  1991年   46538篇
  1990年   44183篇
  1989年   44192篇
  1988年   41042篇
  1987年   40189篇
  1986年   38225篇
  1985年   39065篇
  1984年   38707篇
  1983年   36200篇
  1982年   38146篇
  1981年   36380篇
  1980年   34391篇
  1979年   31046篇
  1978年   29832篇
  1977年   27843篇
  1976年   25547篇
  1975年   24207篇
  1974年   23964篇
  1973年   22722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