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   2429071篇
  免费   232297篇
  国内免费   4211篇
耳鼻咽喉   35412篇
儿科学   76275篇
妇产科学   63466篇
基础医学   346774篇
口腔科学   71558篇
临床医学   225278篇
内科学   485861篇
皮肤病学   53631篇
神经病学   210858篇
特种医学   97580篇
外国民族医学   886篇
外科学   370930篇
综合类   56219篇
现状与发展   1篇
一般理论   994篇
预防医学   193921篇
眼科学   56507篇
药学   182044篇
  4篇
中国医学   5328篇
肿瘤学   132052篇
  2019年   26411篇
  2018年   31877篇
  2017年   27426篇
  2016年   29835篇
  2015年   32553篇
  2014年   42659篇
  2013年   60409篇
  2012年   71867篇
  2011年   75249篇
  2010年   49363篇
  2009年   45085篇
  2008年   70362篇
  2007年   73851篇
  2006年   74759篇
  2005年   72583篇
  2004年   69933篇
  2003年   67617篇
  2002年   66869篇
  2001年   113091篇
  2000年   117106篇
  1999年   98579篇
  1998年   27897篇
  1997年   25552篇
  1996年   25483篇
  1995年   24648篇
  1994年   23181篇
  1993年   21573篇
  1992年   79414篇
  1991年   76429篇
  1990年   73606篇
  1989年   70867篇
  1988年   65863篇
  1987年   64821篇
  1986年   61355篇
  1985年   58420篇
  1984年   44229篇
  1983年   37666篇
  1982年   22893篇
  1981年   20337篇
  1979年   41307篇
  1978年   28993篇
  1977年   24353篇
  1976年   22842篇
  1975年   23969篇
  1974年   29646篇
  1973年   28047篇
  1972年   26231篇
  1971年   24153篇
  1970年   22760篇
  1969年   21088篇
排序方式: 共有10000条查询结果,搜索用时 484 毫秒
51.
52.
53.
54.
55.
56.
Direct peroral cholangioscopy (POC) using an ultra‐slim upper endoscope is one modality of POC for intraductal endoscopic evaluation and treatment of the bile duct. Choledochoduodenostomy (CDS) is one modality of biliary bypass surgery that provides a new route to the bile duct. We carried out direct POC using an ultra‐slim upper endoscope without the use of accessories in 10 patients (four sump syndromes, three bile duct strictures and three intrahepatic duct stones) previously undergoing surgical CDS. Direct POC was successful in all patients. The use of an intraductal balloon catheter was required in one patient for advancement of the endoscope into the bile duct. Distal bile ducts with sump syndromes were cleared using baskets and water irrigation under direct POC. Cholangiocarcinoma was diagnosed in one patient with hilar bile duct stricture after cholangioscopic evaluation and a targeting forceps biopsy under direct POC. Intrahepatic duct stones were successfully extracted after intraductal fragmentation under direct POC. Oozing bleeding occurred during intraductal lithotripsy but stopped spontaneously. Direct POC using an ultra‐slim upper endoscope without the assistance of accessories can easily be carried out in patients undergoing CDS.  相似文献   
57.
58.
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   
59.
60.
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   
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