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   1548496篇
  免费   123393篇
  国内免费   3815篇
耳鼻咽喉   20260篇
儿科学   50778篇
妇产科学   44134篇
基础医学   218869篇
口腔科学   44122篇
临床医学   136459篇
内科学   316315篇
皮肤病学   36582篇
神经病学   128659篇
特种医学   58377篇
外国民族医学   484篇
外科学   227977篇
综合类   33891篇
现状与发展   4篇
一般理论   537篇
预防医学   124275篇
眼科学   34087篇
药学   106804篇
  1篇
中国医学   3902篇
肿瘤学   89187篇
  2021年   14214篇
  2019年   14641篇
  2018年   20660篇
  2017年   15713篇
  2016年   17103篇
  2015年   19377篇
  2014年   27260篇
  2013年   39341篇
  2012年   54500篇
  2011年   57456篇
  2010年   33124篇
  2009年   31455篇
  2008年   51891篇
  2007年   54791篇
  2006年   54674篇
  2005年   53562篇
  2004年   50975篇
  2003年   48303篇
  2002年   45065篇
  2001年   76057篇
  2000年   77582篇
  1999年   64342篇
  1998年   18218篇
  1997年   16436篇
  1996年   16593篇
  1995年   15618篇
  1994年   14242篇
  1993年   13354篇
  1992年   47590篇
  1991年   45144篇
  1990年   43040篇
  1989年   41075篇
  1988年   37607篇
  1987年   36708篇
  1986年   34168篇
  1985年   32510篇
  1984年   24729篇
  1983年   20759篇
  1982年   12631篇
  1981年   11205篇
  1979年   21370篇
  1978年   15023篇
  1977年   12446篇
  1976年   11672篇
  1975年   12024篇
  1974年   14420篇
  1973年   13939篇
  1972年   12979篇
  1971年   11768篇
  1970年   11263篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
We report on a child with several café au lait spots in association with a lumbar lipomeningomyelocele as an apparently new association. Cutaneous markers, the identification of which plays a crucial role in the early diagnosis and management of spinal malformations, can accompany occult spinal dysraphism. Herein we report a case of lumbar lipomeningomyelocele associated with an overlying café au lait spot that served as a marker of occult spinal dysraphism. The patient also had segmental café au lait spots on the face, making the association unique.  相似文献   
44.
45.
46.
47.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
48.
49.
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   
50.
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