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   1319704篇
  免费   102606篇
  国内免费   2114篇
耳鼻咽喉   18944篇
儿科学   45585篇
妇产科学   35775篇
基础医学   187382篇
口腔科学   34324篇
临床医学   115731篇
内科学   267452篇
皮肤病学   28684篇
神经病学   104373篇
特种医学   52900篇
外国民族医学   661篇
外科学   203779篇
综合类   27458篇
现状与发展   1篇
一般理论   414篇
预防医学   98512篇
眼科学   28658篇
药学   97387篇
  2篇
中国医学   2466篇
肿瘤学   73936篇
  2019年   10004篇
  2018年   14231篇
  2017年   10766篇
  2016年   11726篇
  2015年   13379篇
  2014年   18743篇
  2013年   28189篇
  2012年   39248篇
  2011年   41414篇
  2010年   24680篇
  2009年   23446篇
  2008年   39621篇
  2007年   42330篇
  2006年   42580篇
  2005年   41444篇
  2004年   40501篇
  2003年   39189篇
  2002年   38294篇
  2001年   64330篇
  2000年   66736篇
  1999年   56751篇
  1998年   15649篇
  1997年   14167篇
  1996年   14514篇
  1995年   13751篇
  1994年   13054篇
  1993年   12035篇
  1992年   44744篇
  1991年   43645篇
  1990年   42372篇
  1989年   40259篇
  1988年   37035篇
  1987年   36362篇
  1986年   33742篇
  1985年   32402篇
  1984年   24277篇
  1983年   20425篇
  1982年   11902篇
  1981年   10838篇
  1979年   21419篇
  1978年   14885篇
  1977年   12590篇
  1976年   11730篇
  1975年   12648篇
  1974年   14700篇
  1973年   14135篇
  1972年   12960篇
  1971年   11742篇
  1970年   11057篇
  1969年   10032篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
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   
35.
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   
36.
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   
37.
38.
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   
39.
40.
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