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   3670238篇
  免费   272725篇
  国内免费   8959篇
耳鼻咽喉   50176篇
儿科学   120904篇
妇产科学   102201篇
基础医学   517085篇
口腔科学   105528篇
临床医学   331096篇
内科学   716564篇
皮肤病学   85193篇
神经病学   301607篇
特种医学   141608篇
外国民族医学   1130篇
外科学   546327篇
综合类   79781篇
现状与发展   6篇
一般理论   1416篇
预防医学   291301篇
眼科学   84333篇
药学   272488篇
  10篇
中国医学   7313篇
肿瘤学   195855篇
  2018年   40793篇
  2017年   31133篇
  2016年   35427篇
  2015年   40237篇
  2014年   54966篇
  2013年   83092篇
  2012年   111973篇
  2011年   118352篇
  2010年   70530篇
  2009年   66834篇
  2008年   110338篇
  2007年   116994篇
  2006年   118517篇
  2005年   114106篇
  2004年   110490篇
  2003年   106168篇
  2002年   102817篇
  2001年   168867篇
  2000年   173677篇
  1999年   146880篇
  1998年   42361篇
  1997年   37773篇
  1996年   37792篇
  1995年   36674篇
  1994年   33930篇
  1993年   31872篇
  1992年   116916篇
  1991年   113426篇
  1990年   110200篇
  1989年   106655篇
  1988年   98417篇
  1987年   96687篇
  1986年   91489篇
  1985年   87712篇
  1984年   65677篇
  1983年   56127篇
  1982年   33246篇
  1981年   29868篇
  1979年   60371篇
  1978年   42335篇
  1977年   36039篇
  1976年   33599篇
  1975年   35863篇
  1974年   43055篇
  1973年   41127篇
  1972年   38439篇
  1971年   35925篇
  1970年   33121篇
  1969年   31771篇
  1968年   29090篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
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   
102.
103.
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   
104.
105.
106.
107.
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   
108.
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   
109.
110.
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