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   197633篇
  免费   17661篇
  国内免费   10474篇
耳鼻咽喉   1872篇
儿科学   2874篇
妇产科学   3164篇
基础医学   25687篇
口腔科学   3689篇
临床医学   24061篇
内科学   32476篇
皮肤病学   2593篇
神经病学   13291篇
特种医学   6441篇
外国民族医学   88篇
外科学   21673篇
综合类   24614篇
现状与发展   41篇
一般理论   56篇
预防医学   15024篇
眼科学   5124篇
药学   18743篇
  94篇
中国医学   7791篇
肿瘤学   16372篇
  2024年   403篇
  2023年   2212篇
  2022年   5008篇
  2021年   7925篇
  2020年   5708篇
  2019年   5596篇
  2018年   6332篇
  2017年   5317篇
  2016年   5301篇
  2015年   7297篇
  2014年   9119篇
  2013年   9145篇
  2012年   13224篇
  2011年   14267篇
  2010年   8600篇
  2009年   7103篇
  2008年   10087篇
  2007年   10140篇
  2006年   9654篇
  2005年   9310篇
  2004年   6903篇
  2003年   6331篇
  2002年   5791篇
  2001年   7231篇
  2000年   7249篇
  1999年   6863篇
  1998年   3588篇
  1997年   3186篇
  1996年   2308篇
  1995年   2131篇
  1994年   1834篇
  1993年   1311篇
  1992年   2894篇
  1991年   2426篇
  1990年   2177篇
  1989年   2078篇
  1988年   1798篇
  1987年   1595篇
  1986年   1433篇
  1985年   1162篇
  1984年   710篇
  1983年   587篇
  1982年   322篇
  1981年   261篇
  1980年   188篇
  1979年   328篇
  1978年   81篇
  1974年   79篇
  1973年   99篇
  1972年   74篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
11.
12.

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   
13.
14.
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   
15.
16.
17.
Bipolar disorder (BD) is a common psychiatric mood disorder affecting more than 1-2% of the general population of different European countries. Unfortunately, there is no objective laboratory-based test to aid BD diagnosis or monitor its progression, and little is known about the molecular basis of BD. Here, we performed a comparative proteomic study to identify differentially expressed plasma proteins in various BD mood states (depressed BD, manic BD, and euthymic BD) relative to healthy controls. A total of 10 euthymic BD, 20 depressed BD, 15 manic BD, and 20 demographically matched healthy control subjects were recruited. Seven high-abundance proteins were immunodepleted in plasma samples from the 4 experimental groups, which were then subjected to proteome-wide expression profiling by two-dimensional electrophoresis and matrix-assisted laser desorption/ionization-time-of-flight/time-of-flight tandem mass spectrometry. Proteomic results were validated by immunoblotting and bioinformatically analyzed using MetaCore. From a total of 32 proteins identified with 1.5-fold changes in expression compared with healthy controls, 16 proteins were perturbed in BD independent of mood state, while 16 proteins were specifically associated with particular BD mood states. Two mood-independent differential proteins, apolipoprotein (Apo) A1 and Apo L1, suggest that BD pathophysiology may be associated with early perturbations in lipid metabolism. Moreover, down-regulation of one mood-dependent protein, carbonic anhydrase 1 (CA-1), suggests it may be involved in the pathophysiology of depressive episodes in BD. Thus, BD pathophysiology may be associated with early perturbations in lipid metabolism that are independent of mood state, while CA-1 may be involved in the pathophysiology of depressive episodes.  相似文献   
18.
19.
20.
European Archives of Oto-Rhino-Laryngology - Several polymorphisms in a disintegrin and metalloproteinase 33 (ADAM33) have been implicated in susceptibility to allergic rhinitis (AR), but the...  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