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   2764496篇
  免费   214511篇
  国内免费   4596篇
耳鼻咽喉   39482篇
儿科学   85514篇
妇产科学   71877篇
基础医学   406847篇
口腔科学   76940篇
临床医学   253078篇
内科学   532133篇
皮肤病学   56923篇
神经病学   223764篇
特种医学   110264篇
外国民族医学   933篇
外科学   418311篇
综合类   61476篇
现状与发展   3篇
一般理论   1060篇
预防医学   220539篇
眼科学   64455篇
药学   209213篇
  5篇
中国医学   5164篇
肿瘤学   145622篇
  2018年   28175篇
  2016年   24040篇
  2015年   27050篇
  2014年   38484篇
  2013年   58277篇
  2012年   79925篇
  2011年   85092篇
  2010年   49865篇
  2009年   47062篇
  2008年   80221篇
  2007年   85856篇
  2006年   86427篇
  2005年   83988篇
  2004年   81028篇
  2003年   78300篇
  2002年   77182篇
  2001年   126256篇
  2000年   130610篇
  1999年   110158篇
  1998年   31588篇
  1997年   28466篇
  1996年   28324篇
  1995年   27292篇
  1994年   25624篇
  1993年   24044篇
  1992年   89032篇
  1991年   87822篇
  1990年   85325篇
  1989年   82408篇
  1988年   76616篇
  1987年   75526篇
  1986年   71267篇
  1985年   68093篇
  1984年   51329篇
  1983年   43726篇
  1982年   26005篇
  1981年   23215篇
  1980年   21823篇
  1979年   48361篇
  1978年   34062篇
  1977年   28342篇
  1976年   27296篇
  1975年   29402篇
  1974年   35758篇
  1973年   33914篇
  1972年   31764篇
  1971年   29417篇
  1970年   27683篇
  1969年   25662篇
  1968年   23508篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
35.
36.
37.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
38.

Purpose

Endovascular treatment with mechanical thrombectomy devices demonstrated high recanalization rates but functional outcome did not correlate with high rates of recanalization obtained. Patient selection prior to the endovascular treatment is very important in the final outcome of the patient. The primary aim of our study was to evaluate the prognostic value of posterior circulation Alberta Stroke Program Early CT Score (pc-ASPECTS) and Pons-Midbrain Index (PMI) scores in patients with Basilar Artery Occlusion (BAO) treated with successful angiographic recanalization after mechanical thrombectomy.

Methods

Retrospective single-center study including 18 patients between 2008 and 2013 who had acute basilar artery occlusion managed with endovascular treatment within 24 hours from symptoms onset and with successful angiographic recanalization. The patients were initially classified into two groups according to clinical outcome and mortality at 90 days. For analysis we also divided patients into groups based on pc-ASPECTS (≥8vs.< 8) and PMI (≥3vs.< 3) on non-contrast CT (NCCT) and CT Angiography Source Images (CTASI). Imaging data were correlated to clinical outcome and mortality rate.

Results

CTASI pc-ASPECTS, dichotomized at < 8 versus≥8, was associated with a favorable outcome (RR: 2.6; 95% CI: 1.3-5.2) and a reduced risk of death (RR: 6.5: 95% CI: 7.8-23.3). All patients that survived and were functionally independent had pc-ASPECTS score≥8. None of the 5 patients with CTASI pc-ASPECTS score less than 8 survived.

Conclusion

PC-ASPECTS on CTASI is helpful for predicting functional outcome after BAO recanalization with endovascular treatment. These results should be validated in a randomized controlled trial in order to decide whether or not to treat a patient with BAO.  相似文献   
39.
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   
40.
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   
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