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   2666689篇
  免费   194847篇
  国内免费   7730篇
耳鼻咽喉   35352篇
儿科学   87296篇
妇产科学   73232篇
基础医学   374373篇
口腔科学   72511篇
临床医学   242467篇
内科学   533016篇
皮肤病学   64179篇
神经病学   220797篇
特种医学   102449篇
外国民族医学   736篇
外科学   399283篇
综合类   51099篇
现状与发展   5篇
一般理论   1033篇
预防医学   204121篇
眼科学   58398篇
药学   193830篇
  9篇
中国医学   5529篇
肿瘤学   149551篇
  2021年   21568篇
  2019年   22278篇
  2018年   31751篇
  2017年   24146篇
  2016年   27865篇
  2015年   31806篇
  2014年   43151篇
  2013年   64439篇
  2012年   87082篇
  2011年   91346篇
  2010年   54484篇
  2009年   51867篇
  2008年   84707篇
  2007年   90034篇
  2006年   91735篇
  2005年   87642篇
  2004年   84141篇
  2003年   81017篇
  2002年   78050篇
  2001年   129617篇
  2000年   132706篇
  1999年   111484篇
  1998年   31839篇
  1997年   28362篇
  1996年   28657篇
  1995年   27834篇
  1994年   25457篇
  1993年   23769篇
  1992年   85548篇
  1991年   81925篇
  1990年   79113篇
  1989年   76375篇
  1988年   69753篇
  1987年   68270篇
  1986年   63815篇
  1985年   60841篇
  1984年   45239篇
  1983年   38167篇
  1982年   22690篇
  1981年   20195篇
  1979年   39140篇
  1978年   27624篇
  1977年   23404篇
  1976年   21647篇
  1975年   22946篇
  1974年   26954篇
  1973年   25516篇
  1972年   23875篇
  1971年   22066篇
  1970年   20324篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
Henna, derived from a combination of natural leaves and coloring additives, is a common decorative dye traditionally used in many Islamic religious celebrations. Para‐phenylenediamine (PPD), a major component of black henna tattoo, is a strong sensitizer and common allergen. We report a case of severe connubial allergic contact dermatitis after black henna heterotransfer in a girl.  相似文献   
72.
73.
74.
75.
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   
76.
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   
77.
78.
79.
80.
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   
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