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   63585篇
  免费   4620篇
  国内免费   334篇
耳鼻咽喉   637篇
儿科学   1622篇
妇产科学   1541篇
基础医学   7878篇
口腔科学   1539篇
临床医学   6405篇
内科学   14443篇
皮肤病学   836篇
神经病学   5019篇
特种医学   1929篇
外国民族医学   2篇
外科学   9765篇
综合类   1011篇
现状与发展   1篇
一般理论   103篇
预防医学   5276篇
眼科学   1859篇
药学   4449篇
中国医学   141篇
肿瘤学   4083篇
  2023年   294篇
  2022年   466篇
  2021年   1160篇
  2020年   725篇
  2019年   1014篇
  2018年   1259篇
  2017年   851篇
  2016年   974篇
  2015年   1143篇
  2014年   1779篇
  2013年   2816篇
  2012年   3792篇
  2011年   4127篇
  2010年   2359篇
  2009年   2200篇
  2008年   4021篇
  2007年   4210篇
  2006年   4041篇
  2005年   4128篇
  2004年   3853篇
  2003年   3460篇
  2002年   3416篇
  2001年   739篇
  2000年   630篇
  1999年   729篇
  1998年   743篇
  1997年   612篇
  1996年   494篇
  1995年   494篇
  1994年   467篇
  1993年   442篇
  1992年   542篇
  1991年   511篇
  1990年   424篇
  1989年   443篇
  1988年   400篇
  1987年   379篇
  1986年   362篇
  1985年   424篇
  1984年   435篇
  1983年   396篇
  1982年   532篇
  1981年   444篇
  1980年   485篇
  1979年   302篇
  1978年   323篇
  1977年   324篇
  1976年   263篇
  1975年   287篇
  1974年   249篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
We report a 40-year-old man with rheumatic heart disease who presented with abdominal pain for three weeks and hematemesis for 24 hours. CT scan showed a large splenic artery aneurysm without evidence of pancreatitis. Mycotic aneurysm due to infective endocarditis was considered and confirmed by echocardiogram, which showed aortic and mitral valve regurgitation and vegetations. He was managed successfully with coil embolization of the aneurysm and antibiotics.  相似文献   
84.
85.
Apolipoprotein E (apoE, protein; APOE, gene) is the major lipid-transport protein in the brain and plays an important role in modulating the outcome and regenerative processes after acute brain injury. The aim of the present study was to determine if gene transfer of the epsilon3 form of APOE improves outcome in a murine model of transient focal cerebral ischaemia. Mice received an intrastriatal injection of vehicle, a second-generation adenoviral vector containing the green fluorescent protein gene (Ad-GFP) or a vector containing the APOE epsilon3 gene (Ad-APOE) 3 days before 60 mins focal ischaemia. Green fluorescent protein expression was observed in cells throughout the striatum and subcortical white matter indicating successful gene transfer and expression. ApoE levels in the brain were significantly increased after Ad-APOE compared with Ad-GFP or vehicle treatment. Ad-APOE treatment reduced the volume of ischaemic damage by 50% compared with Ad-GFP or vehicle treatment (13+/-3 versus 29+/-4 versus 27+/-5 mm(3)). The extent of postischaemic apoE immunoreactivity was enhanced in Ad-APOE compared with Ad-GFP or vehicle treated mice. These results show the ability of APOE gene transfer to markedly improve outcome after cerebral ischaemia and suggest that modulating apoE levels may be a potential strategy in human stroke therapy.  相似文献   
86.
87.
88.
89.
Abstract: This study examined physical and financial arrangements for medical care of institutionalised elderly people in Singapore. Chief administrators of all long-term care facilities were interviewed on the existing arrangements for medical care of their residents. Results showed that 66 out of a total of 68 (97%) homes arranged medical care for residents. Of those, 29 homes offered on-site medical care with alternative arrangements when the in-house facilities were not operating. While government-owned homes would pay for all medical costs incurred by their residents, over 48% of voluntary homes and 87% of commercial homes required residents to be financially responsible for their care. The availability of financial support given to residents for payment of medical care was found to be associated with the type of sponsorship of the homes. While there was adequate physical access to medical care, the lack of financial support would pose a potential barrier to use of medical care for institutionalised elderly people.  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