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   2820031篇
  免费   223422篇
  国内免费   5183篇
耳鼻咽喉   38839篇
儿科学   94539篇
妇产科学   80415篇
基础医学   403592篇
口腔科学   80498篇
临床医学   252613篇
内科学   548802篇
皮肤病学   62916篇
神经病学   228916篇
特种医学   110295篇
外国民族医学   933篇
外科学   425313篇
综合类   69758篇
现状与发展   7篇
一般理论   1085篇
预防医学   220622篇
眼科学   65721篇
药学   206533篇
  3篇
中国医学   5932篇
肿瘤学   151304篇
  2018年   29570篇
  2017年   22716篇
  2016年   25691篇
  2015年   29094篇
  2014年   40734篇
  2013年   61860篇
  2012年   82971篇
  2011年   87670篇
  2010年   52301篇
  2009年   49618篇
  2008年   82318篇
  2007年   87277篇
  2006年   88446篇
  2005年   85862篇
  2004年   83288篇
  2003年   79572篇
  2002年   77217篇
  2001年   133314篇
  2000年   137154篇
  1999年   115304篇
  1998年   32450篇
  1997年   29309篇
  1996年   29154篇
  1995年   28016篇
  1994年   25963篇
  1993年   24505篇
  1992年   91228篇
  1991年   88364篇
  1990年   85877篇
  1989年   82718篇
  1988年   76504篇
  1987年   75045篇
  1986年   70946篇
  1985年   68193篇
  1984年   51430篇
  1983年   44012篇
  1982年   26348篇
  1981年   23393篇
  1979年   47713篇
  1978年   33404篇
  1977年   28230篇
  1976年   26477篇
  1975年   27763篇
  1974年   33815篇
  1973年   32783篇
  1972年   30324篇
  1971年   28196篇
  1970年   26460篇
  1969年   24601篇
  1968年   22804篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
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   
74.
75.
76.
77.
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   
78.
79.
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   
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