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   2574171篇
  免费   208469篇
  国内免费   4527篇
耳鼻咽喉   37451篇
儿科学   79911篇
妇产科学   70541篇
基础医学   366583篇
口腔科学   73021篇
临床医学   232554篇
内科学   503322篇
皮肤病学   52627篇
神经病学   214184篇
特种医学   103352篇
外国民族医学   920篇
外科学   392060篇
综合类   61530篇
现状与发展   2篇
一般理论   1115篇
预防医学   204624篇
眼科学   60686篇
药学   192561篇
  4篇
中国医学   4908篇
肿瘤学   135211篇
  2018年   26695篇
  2017年   20556篇
  2016年   22656篇
  2015年   25625篇
  2014年   36617篇
  2013年   55830篇
  2012年   74870篇
  2011年   78898篇
  2010年   46826篇
  2009年   44639篇
  2008年   74751篇
  2007年   79611篇
  2006年   80420篇
  2005年   78188篇
  2004年   75382篇
  2003年   72714篇
  2002年   71665篇
  2001年   120516篇
  2000年   124724篇
  1999年   105358篇
  1998年   29873篇
  1997年   27354篇
  1996年   27131篇
  1995年   26211篇
  1994年   24654篇
  1993年   22953篇
  1992年   84601篇
  1991年   81848篇
  1990年   79039篇
  1989年   76189篇
  1988年   70705篇
  1987年   69527篇
  1986年   65854篇
  1985年   62829篇
  1984年   47440篇
  1983年   40416篇
  1982年   24576篇
  1981年   21746篇
  1979年   44382篇
  1978年   31271篇
  1977年   26325篇
  1976年   24620篇
  1975年   26069篇
  1974年   32139篇
  1973年   30578篇
  1972年   28585篇
  1971年   26364篇
  1970年   24875篇
  1969年   23058篇
  1968年   21092篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
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   
54.
55.
56.
57.
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   
58.
Pediatric trachyonychia is an acquired nail disease that can cause distress to families. It is a poorly understood disease, and long‐term follow‐up data are lacking. We present an institutional review of 11 children with isolated pediatric trachyonychia followed over time. Children with the diagnosis of pediatric trachyonychia were identified and invited to participate. Pictures were taken on follow‐up and a questionnaire was answered. Exclusion criteria include having another diagnosis at the initial visit that causes nail dystrophy. Eleven patients with the diagnosis of pediatric trachyonychia were available for follow‐up. The mean age of appearance was 2.7 years (range 2–7 yrs) and the average follow‐up was 66 months (range 10–126 mos). Nine patients were treated with potent topical corticosteroids, one used only petrolatum, and one took vitamin supplements. One patient was found to have an additional skin and hair diagnosis of alopecia areata on follow‐up. On follow‐up, 82% noted improvement of the nails, whereas 18% noted no change. A majority of cases of pediatric trachyonychia are isolated and improve with time, regardless of treatment.  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