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   3639194篇
  免费   273509篇
  国内免费   8835篇
耳鼻咽喉   49631篇
儿科学   120366篇
妇产科学   101176篇
基础医学   512721篇
口腔科学   103708篇
临床医学   332437篇
内科学   708500篇
皮肤病学   83505篇
神经病学   299581篇
特种医学   142030篇
外国民族医学   1150篇
外科学   544918篇
综合类   79973篇
现状与发展   6篇
一般理论   1479篇
预防医学   285203篇
眼科学   83112篇
药学   269583篇
  11篇
中国医学   7086篇
肿瘤学   195362篇
  2018年   39048篇
  2017年   30139篇
  2016年   34625篇
  2015年   39399篇
  2014年   54197篇
  2013年   82268篇
  2012年   109637篇
  2011年   115706篇
  2010年   69686篇
  2009年   66570篇
  2008年   108640篇
  2007年   115220篇
  2006年   116962篇
  2005年   112645篇
  2004年   109377篇
  2003年   105169篇
  2002年   101911篇
  2001年   168494篇
  2000年   173114篇
  1999年   146688篇
  1998年   42833篇
  1997年   38163篇
  1996年   38169篇
  1995年   37099篇
  1994年   34296篇
  1993年   32219篇
  1992年   116734篇
  1991年   113258篇
  1990年   109989篇
  1989年   106559篇
  1988年   98260篇
  1987年   96524篇
  1986年   91297篇
  1985年   87522篇
  1984年   65553篇
  1983年   56068篇
  1982年   33302篇
  1981年   29940篇
  1979年   60051篇
  1978年   42125篇
  1977年   35813篇
  1976年   33370篇
  1975年   35616篇
  1974年   42626篇
  1973年   40610篇
  1972年   37954篇
  1971年   35464篇
  1970年   32675篇
  1969年   31254篇
  1968年   28555篇
排序方式: 共有10000条查询结果,搜索用时 328 毫秒
91.
Henna, derived from a combination of natural leaves and coloring additives, is a common decorative dye traditionally used in many Islamic religious celebrations. Para‐phenylenediamine (PPD), a major component of black henna tattoo, is a strong sensitizer and common allergen. We report a case of severe connubial allergic contact dermatitis after black henna heterotransfer in a girl.  相似文献   
92.
93.
94.
Owing to the frequent incidence of blast-induced traumatic brain injury (bTBI) in recent military conflicts, there is an urgent need to develop effective therapies for bTBI-related pathologies. Blood-brain barrier (BBB) breakdown has been reported to occur after primary blast exposure, making restoration of BBB function and integrity a promising therapeutic target. We tested the hypothesis that treatment with dexamethasone (DEX) after primary blast injury potentiates recovery of an in vitro BBB model consisting of mouse brain endothelial cells (bEnd.3). DEX treatment resulted in complete recovery of transendothelial electrical resistance and hydraulic conductivity 1 day after injury, compared with 3 days for vehicle-treated injured cultures. Administration of RU486 (mifepristone) inhibited effects of DEX, confirming that barrier restoration was mediated by glucocorticoid receptor signaling. Potentiated recovery with DEX treatment was accompanied by stronger zonula occludens (ZO)-1 tight junction immunostaining and expression, suggesting that increased ZO-1 expression was a structural correlate to BBB recovery after blast. Interestingly, augmented ZO-1 protein expression was associated with specific upregulation of the α+ isoform but not the α isoform. This is the first study to provide a mechanistic basis for potentiated functional recovery of an in vitro BBB model because of glucocorticoid treatment after primary blast injury.  相似文献   
95.
96.
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   
97.
98.
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   
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