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   3212620篇
  免费   245932篇
  国内免费   8149篇
耳鼻咽喉   43705篇
儿科学   104476篇
妇产科学   87210篇
基础医学   462148篇
口腔科学   89477篇
临床医学   292701篇
内科学   629304篇
皮肤病学   73398篇
神经病学   257581篇
特种医学   124262篇
外国民族医学   743篇
外科学   488602篇
综合类   70587篇
现状与发展   14篇
一般理论   1169篇
预防医学   257196篇
眼科学   73443篇
药学   235436篇
  15篇
中国医学   5971篇
肿瘤学   169263篇
  2018年   35106篇
  2017年   26767篇
  2016年   30780篇
  2015年   34617篇
  2014年   48723篇
  2013年   73633篇
  2012年   97411篇
  2011年   104098篇
  2010年   62954篇
  2009年   60121篇
  2008年   97396篇
  2007年   103943篇
  2006年   105303篇
  2005年   102146篇
  2004年   97463篇
  2003年   94293篇
  2002年   90974篇
  2001年   146457篇
  2000年   150313篇
  1999年   126737篇
  1998年   38055篇
  1997年   33531篇
  1996年   34263篇
  1995年   33264篇
  1994年   30769篇
  1993年   28952篇
  1992年   101015篇
  1991年   98578篇
  1990年   95907篇
  1989年   92076篇
  1988年   84979篇
  1987年   83421篇
  1986年   78553篇
  1985年   75540篇
  1984年   56918篇
  1983年   48348篇
  1982年   29359篇
  1981年   26434篇
  1979年   52219篇
  1978年   37592篇
  1977年   31373篇
  1976年   29715篇
  1975年   31634篇
  1974年   37762篇
  1973年   35931篇
  1972年   33787篇
  1971年   31659篇
  1970年   29031篇
  1969年   27641篇
  1968年   25466篇
排序方式: 共有10000条查询结果,搜索用时 359 毫秒
81.
82.
While previous randomised controlled trials and meta-analyses offer only limited evidence for the effectiveness of cognitive rehabilitation, qualitative studies examining patient perspectives report more positive outcomes. This meta-synthesis of qualitative studies examined patient perspectives of cognitive rehabilitation for memory, attention, and executive function problems in people with multiple sclerosis. Using set eligibility criteria, we screened electronic databases, reference lists, and academic networks for relevant papers. Seven papers (195 participants) were selected. Two independent researchers conducted quality appraisals of papers. Data analysis, guided by the thematic synthesis approach, yielded six main themes. These suggested that patients benefitted from the group environment in rehabilitation. Cognitive rehabilitation facilitated the participants’ reflection and awareness of their cognitive deficits, and was associated with increased knowledge and understanding of their illness. Increased strategy use was reported and associated with improvements in cognitive functioning and greater confidence and perseverance. Participants reported emotional and social improvements, and felt more optimistic. Overall, these changes had a positive impact on participants’ quality of life. This synthesis of qualitative studies indicates that people with multiple sclerosis who experience cognitive deficits benefit from cognitive rehabilitation programmes. This finding must, however, be viewed in light of the limitations of this meta-synthesis. The meta-synthesis was registered in the PROSPERO database under CRD42017040148.  相似文献   
83.
We report two British cases of liver abscess, due to Klebsiella pneumoniae and associated with synchronous infection elsewhere, which required liver resection for definitive treatment. They illustrate the geographic spread of aggressive K pneumoniae liver infection and demonstrate the importance of early aggressive treatment.  相似文献   
84.
85.
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   
86.
87.
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   
88.
89.
90.
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   
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