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   1155896篇
  免费   126079篇
  国内免费   823篇
  1282798篇
  2018年   10855篇
  2017年   10266篇
  2016年   14784篇
  2015年   19923篇
  2014年   23469篇
  2013年   33778篇
  2012年   37608篇
  2011年   38165篇
  2010年   25923篇
  2009年   23849篇
  2008年   33647篇
  2007年   34647篇
  2006年   32676篇
  2005年   31530篇
  2004年   31194篇
  2003年   29899篇
  2002年   29012篇
  2001年   53666篇
  2000年   53850篇
  1999年   42717篇
  1998年   15006篇
  1997年   15713篇
  1996年   14647篇
  1995年   13677篇
  1994年   13265篇
  1993年   13141篇
  1992年   34952篇
  1991年   33898篇
  1990年   32966篇
  1989年   32024篇
  1988年   29724篇
  1987年   27920篇
  1986年   25965篇
  1985年   25744篇
  1984年   21449篇
  1983年   17973篇
  1982年   13682篇
  1981年   12284篇
  1980年   11554篇
  1979年   19702篇
  1978年   15331篇
  1977年   13936篇
  1976年   12676篇
  1975年   14035篇
  1974年   15096篇
  1973年   14849篇
  1972年   13427篇
  1971年   12233篇
  1970年   10520篇
  1969年   10084篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Over the past 10 years the AIDS crisis has produced a large volume of writing. Much of this is documentary. Dozens of studies of AIDS from various clinical and political perspectives have been complemented by just as many published diaries, autobiographies, novels, plays, and poems. A few of these works have risen to the surface not only as extraordinarily valuable testimonies to the changes AIDS has wrought in individual and collective life but also as first-rate literary works, worth reading because beyond their immediate purposes they articulate with extraordinary lucidity and compassion some deep truths about the human--and the modern--condition. Paul Monette's Borrowed Time is among the most distinctive of those. It speaks not only for the community of people with AIDS and those who support them but for a generation.  相似文献   
102.
103.
Trigger finger is a relatively common clinical entity, most frequently caused by stenosing tenosynovitis. Several other conditions not related to tenosynovitis also have been described as a cause of triggering, and these have been reviewed. We present a rare anomaly of the fourth lumbrical muscle insertion as a cause of triggering of the right little finger. This was completely relieved following excision of the anomalous muscle. This rare anatomic variant should be added to the list of potential causes of trigger finger.  相似文献   
104.
105.
106.
107.
108.
109.
110.
The frequency of cytokine-producing CD4-/CD8- mononuclear cells was assessed in patients of different age groups (29 infants, aged 1-5 years; 30 schoolchildren, aged 6-14 years, 26 adults, aged > 15 years) with acute Plasmodium falciparum malaria, from Gabon. Fifteen patients were followed up before antimalarial treatment (day 0), during parasite clearance (day 3) and after resolution of parasitemia (day 10). By using flow cytometry for intracellular detection of cytokines, a striking expansion of CD4-/CD8- cells producing the type 1 cytokines interleukin (IL)-2-/interferon (IFN)-gamma+, IL-2+/IFN-gamma+ and IL-2+/IFN-gamma- was observed in adults as compared with children. Type 2 cytokine expression (IL-4+/IFN-gamma-, IL-13+/IFN-gamma-) and type 0 cells (IL-4+/IFN-gamma+, IL-13+/IFN-gamma+) were not significantly different between the three age groups. Patients with severe malaria had a significantly increased frequency of type 2 cytokine-producing CD4-/CD8- cells. Drug-induced clearance of parasitemia was characterized by a decrease of IL-2+/IFN-gamma- and type 2 cytokine expressing CD4-/CD8- cells and by a gradual increase of IL-10+/IFN-gamma- expression. The type 1/type 2 dichotomy observed within the CD4-/CD8- cell population is likely to be of significance in the host response against P. falciparum malaria.  相似文献   
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