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   2474288篇
  免费   187541篇
  国内免费   5530篇
耳鼻咽喉   35100篇
儿科学   78825篇
妇产科学   71683篇
基础医学   348125篇
口腔科学   71173篇
临床医学   216539篇
内科学   488001篇
皮肤病学   57273篇
神经病学   201443篇
特种医学   96262篇
外国民族医学   879篇
外科学   376773篇
综合类   57790篇
现状与发展   8篇
一般理论   868篇
预防医学   184961篇
眼科学   57801篇
药学   180481篇
  5篇
中国医学   5444篇
肿瘤学   137925篇
  2018年   25370篇
  2017年   19704篇
  2016年   22078篇
  2015年   24829篇
  2014年   35143篇
  2013年   52909篇
  2012年   70694篇
  2011年   74831篇
  2010年   44257篇
  2009年   42647篇
  2008年   70360篇
  2007年   75379篇
  2006年   76354篇
  2005年   74077篇
  2004年   71271篇
  2003年   68441篇
  2002年   66872篇
  2001年   119294篇
  2000年   122389篇
  1999年   102767篇
  1998年   28509篇
  1997年   25888篇
  1996年   25423篇
  1995年   24111篇
  1994年   22212篇
  1993年   20737篇
  1992年   78749篇
  1991年   75671篇
  1990年   73513篇
  1989年   70925篇
  1988年   65684篇
  1987年   64301篇
  1986年   61148篇
  1985年   58044篇
  1984年   44015篇
  1983年   37245篇
  1982年   22582篇
  1981年   20359篇
  1979年   40579篇
  1978年   28807篇
  1977年   24610篇
  1976年   22586篇
  1975年   24674篇
  1974年   29328篇
  1973年   28537篇
  1972年   27070篇
  1971年   24933篇
  1970年   23766篇
  1969年   22553篇
  1968年   21286篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
43.
44.
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   
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