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   4204793篇
  免费   340796篇
  国内免费   13824篇
耳鼻咽喉   58602篇
儿科学   134708篇
妇产科学   110326篇
基础医学   650590篇
口腔科学   113363篇
临床医学   381717篇
内科学   759514篇
皮肤病学   105873篇
神经病学   349668篇
特种医学   163554篇
外国民族医学   503篇
外科学   646524篇
综合类   119220篇
现状与发展   23篇
一般理论   2562篇
预防医学   352667篇
眼科学   98758篇
药学   294304篇
  26篇
中国医学   11295篇
肿瘤学   205616篇
  2021年   55671篇
  2020年   35451篇
  2019年   58385篇
  2018年   73601篇
  2017年   56235篇
  2016年   62267篇
  2015年   75310篇
  2014年   109638篇
  2013年   174762篇
  2012年   120458篇
  2011年   125938篇
  2010年   125125篇
  2009年   126482篇
  2008年   112288篇
  2007年   119641篇
  2006年   128426篇
  2005年   123604篇
  2004年   123887篇
  2003年   114302篇
  2002年   103555篇
  2001年   149665篇
  2000年   144517篇
  1999年   134297篇
  1998年   70076篇
  1997年   66199篇
  1996年   64411篇
  1995年   59687篇
  1994年   53770篇
  1993年   50038篇
  1992年   96041篇
  1991年   92637篇
  1990年   89047篇
  1989年   86811篇
  1988年   80015篇
  1987年   78507篇
  1986年   73851篇
  1985年   72974篇
  1984年   61660篇
  1983年   55426篇
  1982年   46017篇
  1981年   43115篇
  1980年   40503篇
  1979年   53099篇
  1978年   44031篇
  1977年   38883篇
  1976年   36264篇
  1975年   36271篇
  1974年   39407篇
  1973年   37631篇
  1972年   35242篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
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   
182.
183.
184.
185.
186.
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   
187.
188.
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   
189.
190.
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