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   63366篇
  免费   4589篇
  国内免费   334篇
耳鼻咽喉   635篇
儿科学   1603篇
妇产科学   1542篇
基础医学   7844篇
口腔科学   1537篇
临床医学   6358篇
内科学   14387篇
皮肤病学   809篇
神经病学   5000篇
特种医学   1917篇
外国民族医学   2篇
外科学   9781篇
综合类   1010篇
现状与发展   1篇
一般理论   103篇
预防医学   5254篇
眼科学   1858篇
药学   4428篇
中国医学   139篇
肿瘤学   4081篇
  2023年   295篇
  2022年   463篇
  2021年   1162篇
  2020年   728篇
  2019年   1016篇
  2018年   1248篇
  2017年   852篇
  2016年   970篇
  2015年   1136篇
  2014年   1780篇
  2013年   2809篇
  2012年   3776篇
  2011年   4119篇
  2010年   2348篇
  2009年   2192篇
  2008年   4008篇
  2007年   4194篇
  2006年   4021篇
  2005年   4116篇
  2004年   3842篇
  2003年   3454篇
  2002年   3416篇
  2001年   730篇
  2000年   625篇
  1999年   724篇
  1998年   741篇
  1997年   609篇
  1996年   492篇
  1995年   491篇
  1994年   466篇
  1993年   440篇
  1992年   531篇
  1991年   510篇
  1990年   418篇
  1989年   439篇
  1988年   397篇
  1987年   374篇
  1986年   355篇
  1985年   419篇
  1984年   432篇
  1983年   394篇
  1982年   528篇
  1981年   443篇
  1980年   485篇
  1979年   301篇
  1978年   321篇
  1977年   321篇
  1976年   261篇
  1975年   287篇
  1974年   246篇
排序方式: 共有10000条查询结果,搜索用时 19 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