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   3370359篇
  免费   247715篇
  国内免费   8604篇
耳鼻咽喉   46599篇
儿科学   112510篇
妇产科学   93311篇
基础医学   474297篇
口腔科学   92806篇
临床医学   306173篇
内科学   663089篇
皮肤病学   78884篇
神经病学   274610篇
特种医学   131074篇
外国民族医学   1282篇
外科学   508171篇
综合类   69860篇
现状与发展   6篇
一般理论   1225篇
预防医学   258099篇
眼科学   76031篇
药学   248349篇
  9篇
中国医学   6798篇
肿瘤学   183495篇
  2019年   26196篇
  2018年   36977篇
  2017年   28319篇
  2016年   32556篇
  2015年   36730篇
  2014年   50585篇
  2013年   76213篇
  2012年   102161篇
  2011年   108269篇
  2010年   65373篇
  2009年   62471篇
  2008年   101527篇
  2007年   108097篇
  2006年   109533篇
  2005年   105411篇
  2004年   101921篇
  2003年   98414篇
  2002年   95243篇
  2001年   161357篇
  2000年   165784篇
  1999年   140327篇
  1998年   40330篇
  1997年   35911篇
  1996年   36048篇
  1995年   34766篇
  1994年   32203篇
  1993年   30165篇
  1992年   110120篇
  1991年   106369篇
  1990年   103319篇
  1989年   99763篇
  1988年   91557篇
  1987年   89843篇
  1986年   84068篇
  1985年   80318篇
  1984年   60051篇
  1983年   50852篇
  1982年   29914篇
  1981年   26996篇
  1979年   53340篇
  1978年   37498篇
  1977年   31975篇
  1976年   29654篇
  1975年   31698篇
  1974年   37325篇
  1973年   35572篇
  1972年   33271篇
  1971年   30666篇
  1970年   28573篇
  1969年   26933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.
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   
93.
94.
95.
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   
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