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   4488405篇
  免费   351756篇
  国内免费   14959篇
耳鼻咽喉   61732篇
儿科学   143182篇
妇产科学   116837篇
基础医学   683659篇
口腔科学   120837篇
临床医学   411405篇
内科学   816731篇
皮肤病学   109600篇
神经病学   380928篇
特种医学   173661篇
外国民族医学   761篇
外科学   674798篇
综合类   123708篇
现状与发展   24篇
一般理论   2842篇
预防医学   373211篇
眼科学   104672篇
药学   317527篇
  29篇
中国医学   12179篇
肿瘤学   226797篇
  2021年   57625篇
  2020年   36730篇
  2019年   60141篇
  2018年   76316篇
  2017年   58432篇
  2016年   64703篇
  2015年   77589篇
  2014年   112418篇
  2013年   178710篇
  2012年   135639篇
  2011年   141835篇
  2010年   130107篇
  2009年   130611篇
  2008年   126809篇
  2007年   135257篇
  2006年   143639篇
  2005年   137609篇
  2004年   138168篇
  2003年   127737篇
  2002年   116454篇
  2001年   167864篇
  2000年   162838篇
  1999年   149489篇
  1998年   72398篇
  1997年   68152篇
  1996年   66107篇
  1995年   61453篇
  1994年   55389篇
  1993年   51367篇
  1992年   107129篇
  1991年   101840篇
  1990年   97685篇
  1989年   95234篇
  1988年   87543篇
  1987年   85741篇
  1986年   80603篇
  1985年   78784篇
  1984年   65784篇
  1983年   58509篇
  1982年   47477篇
  1981年   44157篇
  1980年   41325篇
  1979年   55370篇
  1978年   44998篇
  1977年   40203篇
  1976年   37060篇
  1975年   36987篇
  1974年   39816篇
  1973年   37970篇
  1972年   35574篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
131.
132.
133.
134.
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   
135.
136.
Sorsby fundus dystrophy (SFD), an autosomal dominant, fully penetrant, degenerative disease of the macula, is manifested by symptoms of night blindness or sudden loss of visual acuity, usually in the third to fourth decades of life due to choroidal neovascularization (CNV). SFD is caused by specific mutations in the Tissue Inhibitor of Metalloproteinase-3, (TIMP3) gene. The predominant histo-pathological feature in the eyes of patients with SFD are confluent 20–30 m thick, amorphous deposits found between the basement membrane of the retinal pigment epithelium (RPE) and the inner collagenous layer of Bruch's membrane. SFD is a rare disease but it has generated significant interest because it closely resembles the exudative or “wet” form of the more common age-related macular degeneration (AMD). In addition, in both SFD and AMD donor eyes, sub-retinal deposits have been shown to accumulate TIMP3 protein. Understanding the molecular functions of wild-type and mutant TIMP3 will provide significant insights into the patho-physiology of SFD and perhaps AMD. This review summarizes the current knowledge on TIMP3 and how mutations in TIMP3 cause SFD to provide insights into how we can study this disease going forward. Findings from these studies could have potential therapeutic implications for both SFD and AMD.  相似文献   
137.
138.
139.
140.
We report a Chinese family with members affected by epidermolytic ichthyosis (EI), caused by KRT gene mutations. The proband was a 14‐year‐old boy who had simultaneous appearance of nephroblastoma and epidermolytic ichthyosis (EI). Both the patient and his mother exhibited the specific clinical and pathological manifestations of EI. We analysed all exons and flanking sequences of the KRT1 and KRT10 genes using PCR, and found that the proband and his mother had a G>C transition at nucleotide position 1432 in exon 7 of KRT1, resulting in an amino acid substitution of glutamate (GAA) to glutamine (CAA) at codon 478 (E478Q). The KRT10 gene had no mutations.  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