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   2381519篇
  免费   198955篇
  国内免费   4252篇
耳鼻咽喉   34361篇
儿科学   72926篇
妇产科学   63087篇
基础医学   336191篇
口腔科学   67812篇
临床医学   216564篇
内科学   470795篇
皮肤病学   48101篇
神经病学   201675篇
特种医学   96233篇
外国民族医学   886篇
外科学   361946篇
综合类   56316篇
现状与发展   1篇
一般理论   990篇
预防医学   191614篇
眼科学   55679篇
药学   178199篇
  4篇
中国医学   4376篇
肿瘤学   126970篇
  2018年   24518篇
  2016年   20818篇
  2015年   23550篇
  2014年   33903篇
  2013年   51343篇
  2012年   69491篇
  2011年   72989篇
  2010年   42917篇
  2009年   41257篇
  2008年   69386篇
  2007年   73781篇
  2006年   74628篇
  2005年   72707篇
  2004年   69930篇
  2003年   67517篇
  2002年   66708篇
  2001年   112542篇
  2000年   116601篇
  1999年   98420篇
  1998年   27981篇
  1997年   25607篇
  1996年   25522篇
  1995年   24680篇
  1994年   23213篇
  1993年   21609篇
  1992年   79427篇
  1991年   76423篇
  1990年   73609篇
  1989年   70867篇
  1988年   65870篇
  1987年   64837篇
  1986年   61368篇
  1985年   58425篇
  1984年   44264篇
  1983年   37685篇
  1982年   22931篇
  1981年   20352篇
  1980年   19056篇
  1979年   41324篇
  1978年   28993篇
  1977年   24361篇
  1976年   22849篇
  1975年   23970篇
  1974年   29650篇
  1973年   28053篇
  1972年   26235篇
  1971年   24157篇
  1970年   22760篇
  1969年   21094篇
  1968年   19139篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
45.
46.
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   
47.
48.
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   
49.
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   
50.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  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