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   4066708篇
  免费   307734篇
  国内免费   10202篇
耳鼻咽喉   57478篇
儿科学   130364篇
妇产科学   111140篇
基础医学   568567篇
口腔科学   116935篇
临床医学   375214篇
内科学   789484篇
皮肤病学   91253篇
神经病学   338092篇
特种医学   158566篇
外国民族医学   1438篇
外科学   610128篇
综合类   91179篇
现状与发展   6篇
一般理论   1720篇
预防医学   325326篇
眼科学   94706篇
药学   301334篇
  11篇
中国医学   7990篇
肿瘤学   213713篇
  2018年   43693篇
  2017年   33612篇
  2016年   38170篇
  2015年   43080篇
  2014年   60669篇
  2013年   92080篇
  2012年   122383篇
  2011年   129887篇
  2010年   77887篇
  2009年   74458篇
  2008年   121881篇
  2007年   129449篇
  2006年   131214篇
  2005年   126841篇
  2004年   122236篇
  2003年   117855篇
  2002年   114697篇
  2001年   187054篇
  2000年   192545篇
  1999年   163301篇
  1998年   48485篇
  1997年   43271篇
  1996年   42915篇
  1995年   41618篇
  1994年   38638篇
  1993年   36152篇
  1992年   129764篇
  1991年   125530篇
  1990年   121336篇
  1989年   117245篇
  1988年   108365篇
  1987年   106747篇
  1986年   100819篇
  1985年   96582篇
  1984年   72639篇
  1983年   62033篇
  1982年   37355篇
  1981年   33616篇
  1979年   66750篇
  1978年   47234篇
  1977年   40024篇
  1976年   37495篇
  1975年   39595篇
  1974年   47992篇
  1973年   45811篇
  1972年   43110篇
  1971年   39925篇
  1970年   37308篇
  1969年   35279篇
  1968年   32452篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
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   
65.
66.
67.
68.
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   
69.

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   
70.
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