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   4067157篇
  免费   307972篇
  国内免费   10209篇
耳鼻咽喉   57504篇
儿科学   130371篇
妇产科学   111190篇
基础医学   568814篇
口腔科学   116942篇
临床医学   375267篇
内科学   789181篇
皮肤病学   91288篇
神经病学   338191篇
特种医学   158684篇
外国民族医学   1438篇
外科学   610609篇
综合类   91151篇
现状与发展   6篇
一般理论   1720篇
预防医学   324998篇
眼科学   94711篇
药学   301408篇
  11篇
中国医学   7984篇
肿瘤学   213870篇
  2018年   43842篇
  2017年   33714篇
  2016年   38286篇
  2015年   43180篇
  2014年   60814篇
  2013年   92292篇
  2012年   122687篇
  2011年   130113篇
  2010年   78017篇
  2009年   74600篇
  2008年   122095篇
  2007年   129673篇
  2006年   131419篇
  2005年   127059篇
  2004年   122396篇
  2003年   117995篇
  2002年   114838篇
  2001年   187071篇
  2000年   192551篇
  1999年   163316篇
  1998年   48524篇
  1997年   43290篇
  1996年   42928篇
  1995年   41641篇
  1994年   38658篇
  1993年   36160篇
  1992年   129764篇
  1991年   125532篇
  1990年   121344篇
  1989年   117257篇
  1988年   108369篇
  1987年   106758篇
  1986年   100826篇
  1985年   96583篇
  1984年   72641篇
  1983年   62034篇
  1982年   37361篇
  1981年   33621篇
  1979年   66750篇
  1978年   47234篇
  1977年   40023篇
  1976年   37499篇
  1975年   39598篇
  1974年   47991篇
  1973年   45813篇
  1972年   43113篇
  1971年   39924篇
  1970年   37312篇
  1969年   35279篇
  1968年   32455篇
排序方式: 共有10000条查询结果,搜索用时 109 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.
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   
107.
108.
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   
109.
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   
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