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   2156134篇
  免费   166085篇
  国内免费   4339篇
耳鼻咽喉   29287篇
儿科学   66047篇
妇产科学   59275篇
基础医学   306273篇
口腔科学   61645篇
临床医学   191667篇
内科学   426969篇
皮肤病学   48671篇
神经病学   174152篇
特种医学   83042篇
外国民族医学   536篇
外科学   333503篇
综合类   46934篇
现状与发展   4篇
一般理论   683篇
预防医学   160523篇
眼科学   49364篇
药学   157815篇
  4篇
中国医学   4844篇
肿瘤学   125320篇
  2019年   16080篇
  2018年   23134篇
  2017年   17809篇
  2016年   19975篇
  2015年   22506篇
  2014年   31394篇
  2013年   46777篇
  2012年   63456篇
  2011年   66931篇
  2010年   39472篇
  2009年   37953篇
  2008年   63310篇
  2007年   66718篇
  2006年   67852篇
  2005年   65625篇
  2004年   62932篇
  2003年   60275篇
  2002年   58578篇
  2001年   114455篇
  2000年   117404篇
  1999年   97499篇
  1998年   25559篇
  1997年   22864篇
  1996年   23009篇
  1995年   21746篇
  1994年   19847篇
  1993年   18531篇
  1992年   74076篇
  1991年   70880篇
  1990年   68165篇
  1989年   65729篇
  1988年   60170篇
  1987年   58757篇
  1986年   54703篇
  1985年   52418篇
  1984年   38781篇
  1983年   32708篇
  1982年   18688篇
  1981年   16439篇
  1979年   34191篇
  1978年   23554篇
  1977年   19857篇
  1976年   18081篇
  1975年   19051篇
  1974年   23122篇
  1973年   22116篇
  1972年   20807篇
  1971年   19246篇
  1970年   18349篇
  1969年   17105篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
Acne vulgaris (acne) is a chronic inflammatory disease of the sebaceous gland, characterized by follicular hyperkeratinization, excessive colonization by Propionibacterium acnes (Pacnes) as well as immune reactions and inflammation. Despite an armamentarium of topical treatments available including benzoyl peroxide, retinoids and azelaic acid, topical antibiotics in monotherapies, especially erythromycin and clindamycin, are still used in Europe to treat acne. This intensive use led to antimicrobial‐resistant P. acnes and staphylococci strains becoming one of the main health issues worldwide. This is an update on the current topical acne treatments available in Europe, their mechanism of action, their potential to induce antimicrobial resistance and their clinical efficacy and safety.  相似文献   
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.
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   
47.
48.
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   
49.
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