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   3158796篇
  免费   235872篇
  国内免费   4766篇
耳鼻咽喉   44953篇
儿科学   105114篇
妇产科学   85991篇
基础医学   459710篇
口腔科学   87569篇
临床医学   284330篇
内科学   611963篇
皮肤病学   69824篇
神经病学   249877篇
特种医学   120065篇
外国民族医学   1096篇
外科学   478170篇
综合类   67321篇
现状与发展   12篇
一般理论   1119篇
预防医学   247316篇
眼科学   74065篇
药学   235738篇
  11篇
中国医学   6179篇
肿瘤学   169011篇
  2019年   25163篇
  2018年   35061篇
  2017年   26343篇
  2016年   29502篇
  2015年   33261篇
  2014年   46842篇
  2013年   70674篇
  2012年   97321篇
  2011年   103692篇
  2010年   61784篇
  2009年   58374篇
  2008年   97471篇
  2007年   104146篇
  2006年   104981篇
  2005年   101678篇
  2004年   97926篇
  2003年   94434篇
  2002年   91913篇
  2001年   144824篇
  2000年   149043篇
  1999年   126123篇
  1998年   36537篇
  1997年   32188篇
  1996年   32571篇
  1995年   30906篇
  1994年   28722篇
  1993年   26847篇
  1992年   98558篇
  1991年   96572篇
  1990年   94009篇
  1989年   90234篇
  1988年   83053篇
  1987年   81836篇
  1986年   76474篇
  1985年   73609篇
  1984年   55022篇
  1983年   46720篇
  1982年   27734篇
  1981年   24983篇
  1979年   50373篇
  1978年   35738篇
  1977年   30015篇
  1976年   28489篇
  1975年   30780篇
  1974年   36492篇
  1973年   34934篇
  1972年   32577篇
  1971年   30489篇
  1970年   28426篇
  1969年   26756篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
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   
84.
85.
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   
86.
87.
Dosage form is a mean used for the delivery of drug to a living body. In order to get the desired effect the drug should be delivered to its site of action at such rate and concentration to achieve the maximum therapeutic effect and minimum adverse effect. Since oral route is still widely accepted route but having a common drawback of difficulty in swallowing of tablets and capsules. Therefore a lot of research has been done on novel drug delivery systems. This review is about oral dispersible tablets a novel approach in drug delivery systems that are now a day''s more focused in formulation world, and laid a new path that, helped the patients to build their compliance level with the therapy, also reduced the cost and ease the administration especially in case of pediatrics and geriatrics. Quick absorption, rapid onset of action and reduction in drug loss properties are the basic advantages of this dosage form.  相似文献   
88.
89.
90.
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