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   8021篇
  免费   894篇
  国内免费   3篇
  2022年   59篇
  2021年   108篇
  2020年   86篇
  2019年   76篇
  2018年   96篇
  2017年   97篇
  2016年   175篇
  2015年   233篇
  2014年   266篇
  2013年   314篇
  2012年   425篇
  2011年   480篇
  2010年   336篇
  2009年   276篇
  2008年   324篇
  2007年   348篇
  2006年   291篇
  2005年   291篇
  2004年   276篇
  2003年   273篇
  2002年   261篇
  2001年   235篇
  2000年   218篇
  1999年   164篇
  1998年   80篇
  1997年   75篇
  1996年   79篇
  1995年   75篇
  1994年   74篇
  1992年   141篇
  1991年   132篇
  1990年   125篇
  1989年   140篇
  1988年   126篇
  1987年   113篇
  1986年   95篇
  1985年   89篇
  1984年   103篇
  1983年   82篇
  1982年   84篇
  1981年   60篇
  1980年   72篇
  1979年   97篇
  1978年   72篇
  1977年   71篇
  1976年   80篇
  1975年   76篇
  1974年   69篇
  1973年   69篇
  1972年   65篇
排序方式: 共有8918条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
During an HIV-1 prevention clinical trial in East Africa, we observed 16 cases of primary HIV-1 infection in women coincident with pregnancy or breastfeeding. Nine of eleven pregnant women initiated rapid combination antiretroviral therapy (ART), despite having CD4 counts exceeding national criteria for ART initiation; breastfeeding women initiated ART or replacement feeding. Rapid ART initiation during primary HIV-1 infection during pregnancy and breastfeeding is feasible in this setting.  相似文献   
8.
Brief admission of the new diabetic child and of a parent to an enlightened hospital for stabilisation, preliminary education, and familiarisation with hospital and community staff is well worth while. The greater the demand for constant control of the highest quality, the greater the need for a close understanding of the psychosocial factors concerned and for clinical skill. The nature of the home and the family relationships should in theory be available from the child''s general practitioner at the time of the first referral since he has so much information about the whole family. With the virtual disappearance, however, of mutual consultation in the patient''s home in many places, the opportunity for oral communication has declined, and availability on the telephone is not always easy. The busy general practitioner (far less an unknown physician from a deputising service without access to the records) has little time to write a comprehensive letter. In practice a relatively small hospital-based mobile team of specially experienced sisters who are keen to communicate in the home, the GP''s surgery, and the school makes a major contribution to the diabetic care of a young population vulnerable to major handicap in what should be the prime of life. Their cost effectiveness may be difficult to prove but it is not at all in doubt--especially when the sisters as in this area deal in the community with a wider range of chronic illnesses and handicaps in children.  相似文献   
9.
A study was conducted investigating the possibility that the immunosuppressive action of methimazole (the active metabolite of the antithyroid drug carbimazole) might be due to an effect on the production of oxygen radicals by monocytes. Techniques comprised measurement of luminol dependent chemoluminescence in monocytes and a spectrophotometric assay for production of hydrogen peroxide. The results showed definite inhibition of formation of oxygen radicals by resting and stimulated monocytes, which may explain the immunosuppressive action of the drug in Graves'' disease. The findings also suggest that the formation of oxygen radicals and the initiation of the immune response may be closely related.  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