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   2786765篇
  免费   201452篇
  国内免费   8223篇
耳鼻咽喉   37241篇
儿科学   90824篇
妇产科学   75411篇
基础医学   390098篇
口腔科学   77309篇
临床医学   252553篇
内科学   557813篇
皮肤病学   66550篇
神经病学   231530篇
特种医学   106658篇
外国民族医学   756篇
外科学   413344篇
综合类   52428篇
现状与发展   8篇
一般理论   1160篇
预防医学   216906篇
眼科学   61298篇
药学   201826篇
  9篇
中国医学   6128篇
肿瘤学   156590篇
  2021年   24319篇
  2019年   24662篇
  2018年   34462篇
  2017年   26402篇
  2016年   30144篇
  2015年   34259篇
  2014年   47105篇
  2013年   69444篇
  2012年   93687篇
  2011年   98933篇
  2010年   58831篇
  2009年   56155篇
  2008年   90898篇
  2007年   96475篇
  2006年   97659篇
  2005年   94115篇
  2004年   90470篇
  2003年   87071篇
  2002年   82687篇
  2001年   131366篇
  2000年   134004篇
  1999年   113226篇
  1998年   33365篇
  1997年   29630篇
  1996年   29736篇
  1995年   28725篇
  1994年   26267篇
  1993年   24634篇
  1992年   86952篇
  1991年   83244篇
  1990年   80327篇
  1989年   77606篇
  1988年   70908篇
  1987年   69375篇
  1986年   64836篇
  1985年   61835篇
  1984年   46243篇
  1983年   39116篇
  1982年   23644篇
  1981年   21083篇
  1979年   39891篇
  1978年   28209篇
  1977年   23954篇
  1976年   22071篇
  1975年   23470篇
  1974年   27422篇
  1973年   25962篇
  1972年   24221篇
  1971年   22319篇
  1970年   20578篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
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   
82.
83.
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   
84.
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   
85.
86.
87.
88.
89.
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   
90.
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