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   2362728篇
  免费   198092篇
  国内免费   4181篇
医药卫生   2565001篇
  2018年   24201篇
  2016年   20571篇
  2015年   23278篇
  2014年   33532篇
  2013年   50825篇
  2012年   68734篇
  2011年   72273篇
  2010年   42470篇
  2009年   40862篇
  2008年   68757篇
  2007年   73097篇
  2006年   73998篇
  2005年   72037篇
  2004年   69335篇
  2003年   67014篇
  2002年   66261篇
  2001年   112450篇
  2000年   116524篇
  1999年   98334篇
  1998年   27858篇
  1997年   25412篇
  1996年   23734篇
  1995年   24451篇
  1994年   23021篇
  1993年   21429篇
  1992年   79261篇
  1991年   76373篇
  1990年   73532篇
  1989年   70790篇
  1988年   65776篇
  1987年   64749篇
  1986年   61288篇
  1985年   58365篇
  1984年   44145篇
  1983年   37541篇
  1982年   22794篇
  1981年   20226篇
  1980年   18931篇
  1979年   41221篇
  1978年   28910篇
  1977年   24246篇
  1976年   22753篇
  1975年   23902篇
  1974年   29585篇
  1973年   28008篇
  1972年   26204篇
  1971年   24141篇
  1970年   22724篇
  1969年   21062篇
  1968年   19113篇
排序方式: 共有10000条查询结果,搜索用时 31 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