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   705811篇
  免费   49987篇
  国内免费   1302篇
耳鼻咽喉   9173篇
儿科学   23303篇
妇产科学   17613篇
基础医学   110512篇
口腔科学   19982篇
临床医学   63823篇
内科学   134609篇
皮肤病学   16163篇
神经病学   49491篇
特种医学   25803篇
外国民族医学   76篇
外科学   104624篇
综合类   14820篇
现状与发展   2篇
一般理论   160篇
预防医学   51424篇
眼科学   16327篇
药学   54023篇
  3篇
中国医学   2360篇
肿瘤学   42809篇
  2019年   5450篇
  2018年   7881篇
  2017年   6122篇
  2016年   6835篇
  2015年   7575篇
  2014年   10282篇
  2013年   15398篇
  2012年   20527篇
  2011年   21538篇
  2010年   12751篇
  2009年   11953篇
  2008年   20027篇
  2007年   21540篇
  2006年   21931篇
  2005年   20483篇
  2004年   20035篇
  2003年   18980篇
  2002年   18496篇
  2001年   36372篇
  2000年   36930篇
  1999年   30417篇
  1998年   7889篇
  1997年   6672篇
  1996年   6980篇
  1995年   6641篇
  1994年   6112篇
  1993年   5602篇
  1992年   22995篇
  1991年   22944篇
  1990年   22336篇
  1989年   22110篇
  1988年   20055篇
  1987年   19437篇
  1986年   18497篇
  1985年   17325篇
  1984年   12715篇
  1983年   10754篇
  1982年   5923篇
  1979年   11524篇
  1978年   8132篇
  1977年   6835篇
  1976年   6600篇
  1975年   7274篇
  1974年   8506篇
  1973年   8148篇
  1972年   7661篇
  1971年   7129篇
  1970年   6886篇
  1969年   6320篇
  1968年   5781篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
In 1983-1984, 4578 Perth primary and secondary schoolchildren were studied. The selected sample was broadly representative of the ethnic groups that make up the Perth population and of the different social ranks within that population. The age, sex, weight, height, country of birth of the child and the parents, and occupation of the father were recorded for each subject. Weight, height and body mass index (BMI) increased with age. Age and sex were the most important determinants of body size. However, children of lower social rank and those with a southern European background were over-represented among the overweight children (greater than the 90th centile for BMI), particularly in adolescence. Children with an Asian background who were 11 years of age and younger were over-represented among the underweight children (less than or equal to the 10th centile for BMI). Results from this study indicate a continuing, though small (1.5 cm to 1.6 cm), secular increase in height over the past 13 to 14 years.  相似文献   
993.
994.
The health care supervisor responsible for establishing a therapeutic milieu within a traditional hospital organization will have greater success if these suggested management strategies are employed. Decentralizing, improving organizational communication, and clarifying interdisciplinary role relationships are the strategies that support the integration of differing organizational approaches to management.  相似文献   
995.
996.
997.
As free radicals and lipid peroxidation are involved in the pathogenesis of different inflammatory diseases of the liver, the blood malondialdehyde content, the activity or quantity of free radical eliminating enzymes and the natural antioxidant, vitamin E serum level has been studied in ten patients with chronic active hepatitis and in six subjects with alcoholic liver disease. Thirty healthy volunteers served as controls. The serum malondialdehyde/thiobarbituric acid reactive substance and its concentrations increased significantly in both hepatitis groups. The superoxide dismutase content was also raised in the patients' sera. The serum glutathione peroxidase (GSH-Px) activity was decreased in both groups, while the red blood cell GSH-Px showed a significantly lower activity in the alcoholic hepatitis patients. Serum catalase activity and vitamin E levels in both types of chronic hepatitis were not significantly different from the healthy controls.  相似文献   
998.
999.
The hormonal compound with the highest cytostatic activity against MCF-7 tumor cells (human breast cancer, BC) and the lowest activity against normal cells (rat skin fibroblasts) was sought among gestagens, androstenes, and antiestrogencytostatics. It was found that antiestrogencytostatics and androstenes had the highest cytostatic activity against tumor cells whereas gestagens and antiestrogencytostatics were least active against fibroblasts. Studies of the activity of the hormonal compounds in combination with doxorubicin on the viability of MCF-7 and rat skin fibroblasts found that all investigated compounds with the exception of dehydroepiandrosterone (DHEA) intensify the cytostatic activity of doxorubicin against tumor cells, the greatest effect seen for antiestrogencytostatics. A chemoprotective effect of androstenes on normal cells was noted. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 41, No. 7, pp. 3–7, July, 2007.  相似文献   
1000.
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