首页 | 官方网站   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   2368789篇
  免费   198331篇
  国内免费   4197篇
医药卫生   2571317篇
  2018年   24285篇
  2016年   20649篇
  2015年   23336篇
  2014年   33621篇
  2013年   50995篇
  2012年   68943篇
  2011年   72460篇
  2010年   42603篇
  2009年   40948篇
  2008年   68913篇
  2007年   73252篇
  2006年   74130篇
  2005年   72188篇
  2004年   69479篇
  2003年   67142篇
  2002年   66372篇
  2001年   112475篇
  2000年   116550篇
  1999年   98357篇
  1998年   27891篇
  1997年   25545篇
  1996年   25470篇
  1995年   24630篇
  1994年   23177篇
  1993年   21566篇
  1992年   79402篇
  1991年   76404篇
  1990年   73545篇
  1989年   70803篇
  1988年   65785篇
  1987年   64761篇
  1986年   61293篇
  1985年   58377篇
  1984年   44159篇
  1983年   37555篇
  1982年   22804篇
  1981年   20237篇
  1980年   18944篇
  1979年   41228篇
  1978年   28912篇
  1977年   24251篇
  1976年   22761篇
  1975年   23912篇
  1974年   29593篇
  1973年   28020篇
  1972年   26212篇
  1971年   24143篇
  1970年   22727篇
  1969年   21065篇
  1968年   19114篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
51.
52.
53.
54.
55.
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   
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.
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-23

京公网安备 11010802026262号