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   2364731篇
  免费   183867篇
  国内免费   18211篇
耳鼻咽喉   31210篇
儿科学   68601篇
妇产科学   63181篇
基础医学   330007篇
口腔科学   65175篇
临床医学   219441篇
内科学   459511篇
皮肤病学   50845篇
神经病学   185448篇
特种医学   90451篇
外国民族医学   631篇
外科学   355478篇
综合类   79703篇
现状与发展   52篇
一般理论   714篇
预防医学   173109篇
眼科学   55289篇
药学   179554篇
  168篇
中国医学   15509篇
肿瘤学   142732篇
  2021年   25871篇
  2020年   17515篇
  2019年   23115篇
  2018年   30424篇
  2017年   24284篇
  2016年   26066篇
  2015年   31887篇
  2014年   43170篇
  2013年   57646篇
  2012年   79443篇
  2011年   84638篇
  2010年   50322篇
  2009年   46511篇
  2008年   74708篇
  2007年   78221篇
  2006年   78875篇
  2005年   76920篇
  2004年   70486篇
  2003年   66976篇
  2002年   64327篇
  2001年   118310篇
  2000年   121523篇
  1999年   102287篇
  1998年   28789篇
  1997年   26152篇
  1996年   25479篇
  1995年   24088篇
  1994年   21853篇
  1993年   19841篇
  1992年   75569篇
  1991年   72170篇
  1990年   69252篇
  1989年   66639篇
  1988年   60954篇
  1987年   59416篇
  1986年   55221篇
  1985年   52791篇
  1984年   38978篇
  1983年   32863篇
  1982年   18750篇
  1979年   34251篇
  1978年   23575篇
  1977年   19882篇
  1976年   18071篇
  1975年   19052篇
  1974年   23114篇
  1973年   22102篇
  1972年   20798篇
  1971年   19234篇
  1970年   18335篇
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
61.
62.
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   
63.
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   
64.
65.
66.
67.
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   
68.
69.
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   
70.
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