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   2523618篇
  免费   188349篇
  国内免费   4098篇
耳鼻咽喉   34125篇
儿科学   80698篇
妇产科学   66053篇
基础医学   371437篇
口腔科学   67192篇
临床医学   229495篇
内科学   493199篇
皮肤病学   54175篇
神经病学   202572篇
特种医学   93929篇
外国民族医学   498篇
外科学   381061篇
综合类   50146篇
现状与发展   12篇
一般理论   1115篇
预防医学   198461篇
眼科学   59190篇
药学   187398篇
  13篇
中国医学   4859篇
肿瘤学   140437篇
  2021年   22778篇
  2019年   23269篇
  2018年   31357篇
  2017年   23602篇
  2016年   26291篇
  2015年   29788篇
  2014年   42153篇
  2013年   62541篇
  2012年   87221篇
  2011年   92719篇
  2010年   54672篇
  2009年   51374篇
  2008年   86427篇
  2007年   91932篇
  2006年   92523篇
  2005年   90072篇
  2004年   85962篇
  2003年   82488篇
  2002年   79427篇
  2001年   110288篇
  2000年   112623篇
  1999年   95195篇
  1998年   29239篇
  1997年   25517篇
  1996年   25627篇
  1995年   24244篇
  1994年   22163篇
  1993年   20874篇
  1992年   72933篇
  1991年   70903篇
  1990年   69134篇
  1989年   66403篇
  1988年   61026篇
  1987年   59846篇
  1986年   55898篇
  1985年   53729篇
  1984年   40252篇
  1983年   34267篇
  1982年   20921篇
  1979年   36413篇
  1978年   26228篇
  1977年   21735篇
  1976年   20785篇
  1975年   22176篇
  1974年   26521篇
  1973年   25134篇
  1972年   23472篇
  1971年   22257篇
  1970年   20453篇
  1969年   19450篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
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   
72.
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   
73.
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   
74.
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   
75.
76.
77.
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   
78.
79.
80.
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