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   1530279篇
  免费   121940篇
  国内免费   3432篇
耳鼻咽喉   20508篇
儿科学   50794篇
妇产科学   43970篇
基础医学   219428篇
口腔科学   41758篇
临床医学   136208篇
内科学   305896篇
皮肤病学   36819篇
神经病学   129382篇
特种医学   59027篇
外国民族医学   468篇
外科学   228677篇
综合类   33269篇
现状与发展   3篇
一般理论   522篇
预防医学   116967篇
眼科学   34131篇
药学   107087篇
  1篇
中国医学   3534篇
肿瘤学   87202篇
  2021年   11961篇
  2019年   12934篇
  2018年   19198篇
  2017年   14884篇
  2016年   17100篇
  2015年   18447篇
  2014年   25245篇
  2013年   38276篇
  2012年   51613篇
  2011年   54955篇
  2010年   32086篇
  2009年   29641篇
  2008年   51420篇
  2007年   54395篇
  2006年   54674篇
  2005年   53112篇
  2004年   50559篇
  2003年   48512篇
  2002年   46958篇
  2001年   77014篇
  2000年   79638篇
  1999年   64561篇
  1998年   18270篇
  1997年   16447篇
  1996年   16399篇
  1995年   15494篇
  1994年   14060篇
  1993年   13202篇
  1992年   46552篇
  1991年   44092篇
  1990年   42102篇
  1989年   40180篇
  1988年   36709篇
  1987年   35954篇
  1986年   33375篇
  1985年   31980篇
  1984年   24460篇
  1983年   20586篇
  1982年   12776篇
  1981年   11320篇
  1979年   21196篇
  1978年   15042篇
  1977年   12566篇
  1976年   11776篇
  1975年   12055篇
  1974年   14409篇
  1973年   13882篇
  1972年   12934篇
  1971年   11790篇
  1970年   11224篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
41.
42.
43.
44.
45.
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   
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