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   1713篇
  免费   144篇
  国内免费   6篇
耳鼻咽喉   8篇
儿科学   42篇
妇产科学   25篇
基础医学   173篇
口腔科学   41篇
临床医学   183篇
内科学   280篇
皮肤病学   15篇
神经病学   145篇
特种医学   177篇
外科学   246篇
综合类   23篇
预防医学   154篇
眼科学   13篇
药学   138篇
  1篇
中国医学   3篇
肿瘤学   196篇
  2021年   26篇
  2020年   10篇
  2019年   26篇
  2018年   24篇
  2017年   19篇
  2016年   18篇
  2015年   55篇
  2014年   37篇
  2013年   66篇
  2012年   69篇
  2011年   65篇
  2010年   73篇
  2009年   42篇
  2008年   75篇
  2007年   69篇
  2006年   70篇
  2005年   75篇
  2004年   65篇
  2003年   58篇
  2002年   48篇
  2001年   61篇
  2000年   64篇
  1999年   54篇
  1998年   35篇
  1997年   35篇
  1996年   44篇
  1995年   24篇
  1994年   28篇
  1993年   17篇
  1992年   37篇
  1991年   35篇
  1990年   31篇
  1989年   27篇
  1988年   32篇
  1987年   28篇
  1986年   29篇
  1985年   37篇
  1984年   29篇
  1983年   39篇
  1982年   11篇
  1981年   12篇
  1980年   11篇
  1979年   15篇
  1978年   18篇
  1977年   14篇
  1974年   12篇
  1973年   8篇
  1972年   8篇
  1971年   8篇
  1967年   8篇
排序方式: 共有1863条查询结果,搜索用时 15 毫秒
1.
2.
3.
The resolution of three 2-substituted derivatives of idazoxan is described. The enantiomers show large separations in activity in a variety of in vitro and in vivo tests, and the active isomers are all potent and selective antagonists at the alpha 2-adrenoreceptor. The significance of these results in relation to those published on the enantiomers of idazoxan and to those on optically active alpha 2-adrenoreceptor agonists is discussed.  相似文献   
4.
Strahlentherapie und Onkologie - Several randomized trials have demonstrated that men with localized prostate cancer benefit from the use of short-term neoadjuvant androgen deprivation therapy...  相似文献   
5.
Adult male rats were fed a purified diet containing rice bran or wheat bran with or without a marine fish oil to investigate the possible effects of such dietary combinations on lipid metabolism. Plasma and hepatic triacylglycerols and hepatic lipogenesis were lowered significantly by feeding fish oil with rice bran but not with wheat bran. Plasma cholesterol and hepatic cholesterol synthesis were significantly lower in animals fed fish oil with either bran. Liver microsomal free cholesterol was significantly lower in rats fed rice bran alone than in all other groups. Hepatic low density lipoprotein (LDL) receptor activity was significantly higher in the two groups fed rice bran than in the two groups fed wheat bran. Fish oil significantly decreased hepatic LDL receptor activity and increased hepatic high density lipoprotein (HDL) binding activity with wheat bran but had no significant effects on these parameters when added to the rice bran diet. However, when the data for all groups were pooled, there was a significant negative correlation between hepatic HDL binding activity and LDL receptor activity. Cecal volatile fatty acids were significantly higher in rats fed rice bran, were unaffected by adding fish oil to either bran diet and did not appear to mediate any of the effects of the brans and fish oil on plasma lipids and hepatic lipid metabolism. The combination of rice bran plus fish oil therefore appears to have more beneficial effects on lipid metabolism than wheat bran plus fish oil.  相似文献   
6.
7.
A review of the stereotactic cases performed at the University of Iowa between February, 1985, and December, 1990, yielded 12 infratentorial stereotactic biopsies in 11 patients. A definitive diagnosis was obtained in 9 of 11 patients. One patient required a second biopsy to obtain a diagnosis and 1 yielded cystic fluid only. The pathological diagnosis obtained included 4 high-grade gliomas, 2 undifferentiated adenocarcinomas, 2 low-grade astrocytomas, 1 malignant ependymoma, 1 pontine hematoma and 1 cyst. None of the patients experienced increased neurological deficit following biopsy and there was no mortality. One patient developed postoperative meningitis. We conclude that stereotactic biopsy of infratentorial lesions can be performed safely with a high probability of obtaining a diagnosis. Adequate tissue diagnosis is necessary to direct further therapy.  相似文献   
8.
9.
Transient Osteoporosis of the Hip in Pregnancy   总被引:1,自引:0,他引:1  
Summary: Transient osteoporosis of the hip (TOH) is an uncommon condition. This painful regional osteoporosis affects previously healthy women in the third trimester of pregnancy. It is characterized by pain in the affected hip and pronounced osteopenia of the femoral head and neck. It has a relatively short clinical course (average 6 months) and a predictably benign prognosis. Complete clinical and radiological recovery is the rule. The diagnosis is one of exclusion. The cause of the osteopenia is not known, although various aetiological factors have been implicated. A case of TOH occurring in the third trimester of pregnancy with complete recovery within 6 months postpartum is presented.  相似文献   
10.
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