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   2660167篇
  免费   208502篇
  国内免费   4344篇
耳鼻咽喉   35931篇
儿科学   86904篇
妇产科学   74083篇
基础医学   385026篇
口腔科学   77055篇
临床医学   243681篇
内科学   515986篇
皮肤病学   57718篇
神经病学   216793篇
特种医学   103783篇
外国民族医学   725篇
外科学   392982篇
综合类   60857篇
现状与发展   5篇
一般理论   1154篇
预防医学   213857篇
眼科学   60876篇
药学   198100篇
  9篇
中国医学   4672篇
肿瘤学   142816篇
  2018年   27853篇
  2017年   21593篇
  2016年   24005篇
  2015年   27660篇
  2014年   38301篇
  2013年   58148篇
  2012年   79240篇
  2011年   84329篇
  2010年   49401篇
  2009年   47339篇
  2008年   79489篇
  2007年   84347篇
  2006年   84589篇
  2005年   82670篇
  2004年   80178篇
  2003年   76676篇
  2002年   74537篇
  2001年   115227篇
  2000年   118333篇
  1999年   100968篇
  1998年   29285篇
  1997年   26519篇
  1996年   26619篇
  1995年   25604篇
  1994年   23884篇
  1993年   22474篇
  1992年   82297篇
  1991年   80291篇
  1990年   78234篇
  1989年   75784篇
  1988年   70328篇
  1987年   69216篇
  1986年   66094篇
  1985年   63470篇
  1984年   48054篇
  1983年   41896篇
  1982年   25097篇
  1981年   22636篇
  1979年   45831篇
  1978年   32708篇
  1977年   27553篇
  1976年   25876篇
  1975年   27455篇
  1974年   33462篇
  1973年   32490篇
  1972年   30219篇
  1971年   28299篇
  1970年   26310篇
  1969年   24899篇
  1968年   22870篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
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   
72.
73.
74.
75.
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   
76.
77.
78.
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   
79.
80.
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