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   1516799篇
  免费   155057篇
  国内免费   3454篇
耳鼻咽喉   20055篇
儿科学   51692篇
妇产科学   42708篇
基础医学   219569篇
口腔科学   42773篇
临床医学   143315篇
内科学   311694篇
皮肤病学   39955篇
神经病学   132177篇
特种医学   56644篇
外国民族医学   467篇
外科学   226531篇
综合类   33476篇
现状与发展   3篇
一般理论   564篇
预防医学   119271篇
眼科学   33635篇
药学   106275篇
  1篇
中国医学   4390篇
肿瘤学   90115篇
  2021年   12854篇
  2020年   11833篇
  2019年   22109篇
  2018年   25737篇
  2017年   22714篇
  2016年   24945篇
  2015年   26772篇
  2014年   33618篇
  2013年   45646篇
  2012年   51826篇
  2011年   54404篇
  2010年   37293篇
  2009年   33064篇
  2008年   48976篇
  2007年   50658篇
  2006年   51180篇
  2005年   49319篇
  2004年   47208篇
  2003年   44893篇
  2002年   43359篇
  2001年   74156篇
  2000年   75583篇
  1999年   62383篇
  1998年   17631篇
  1997年   15932篇
  1996年   16046篇
  1995年   15195篇
  1994年   13775篇
  1993年   12925篇
  1992年   46225篇
  1991年   43838篇
  1990年   41844篇
  1989年   39896篇
  1988年   36495篇
  1987年   35642篇
  1986年   33167篇
  1985年   31565篇
  1984年   24138篇
  1983年   20294篇
  1982年   12509篇
  1981年   11030篇
  1979年   20933篇
  1978年   14765篇
  1977年   12250篇
  1976年   11507篇
  1975年   11751篇
  1974年   14150篇
  1973年   13683篇
  1972年   12751篇
  1971年   11557篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
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   
53.
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   
54.
55.
56.
57.
58.
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   
59.
60.
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   
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