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   3575531篇
  免费   269000篇
  国内免费   8710篇
耳鼻咽喉   48918篇
儿科学   118605篇
妇产科学   99814篇
基础医学   503503篇
口腔科学   102155篇
临床医学   325154篇
内科学   697091篇
皮肤病学   82632篇
神经病学   293721篇
特种医学   139395篇
外国民族医学   1129篇
外科学   535949篇
综合类   79300篇
现状与发展   6篇
一般理论   1399篇
预防医学   278653篇
眼科学   81775篇
药学   265080篇
  10篇
中国医学   6969篇
肿瘤学   191983篇
  2018年   37610篇
  2017年   29137篇
  2016年   33505篇
  2015年   38109篇
  2014年   52422篇
  2013年   79476篇
  2012年   105702篇
  2011年   111677篇
  2010年   67172篇
  2009年   64379篇
  2008年   105110篇
  2007年   111415篇
  2006年   113277篇
  2005年   109085篇
  2004年   105925篇
  2003年   101995篇
  2002年   98870篇
  2001年   167387篇
  2000年   172023篇
  1999年   145569篇
  1998年   42009篇
  1997年   37546篇
  1996年   37573篇
  1995年   36489篇
  1994年   33780篇
  1993年   31730篇
  1992年   116018篇
  1991年   112588篇
  1990年   109327篇
  1989年   105901篇
  1988年   97658篇
  1987年   95943篇
  1986年   90737篇
  1985年   86984篇
  1984年   65119篇
  1983年   55662篇
  1982年   32968篇
  1981年   29627篇
  1979年   59674篇
  1978年   41848篇
  1977年   35548篇
  1976年   33152篇
  1975年   35344篇
  1974年   42329篇
  1973年   40368篇
  1972年   37726篇
  1971年   35249篇
  1970年   32468篇
  1969年   31057篇
  1968年   28385篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
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   
92.
93.
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   
94.
95.
96.
97.
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   
98.
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   
99.
100.
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