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   1353877篇
  免费   97498篇
  国内免费   2931篇
耳鼻咽喉   19897篇
儿科学   40720篇
妇产科学   39163篇
基础医学   189841篇
口腔科学   40335篇
临床医学   114772篇
内科学   266400篇
皮肤病学   30534篇
神经病学   108197篇
特种医学   54438篇
外国民族医学   435篇
外科学   210803篇
综合类   31171篇
现状与发展   6篇
一般理论   454篇
预防医学   94041篇
眼科学   31632篇
药学   101589篇
  3篇
中国医学   3022篇
肿瘤学   76853篇
  2018年   12467篇
  2016年   11258篇
  2015年   12394篇
  2014年   17254篇
  2013年   26428篇
  2012年   34530篇
  2011年   36553篇
  2010年   21472篇
  2009年   20650篇
  2008年   34992篇
  2007年   38110篇
  2006年   38523篇
  2005年   37200篇
  2004年   36139篇
  2003年   35080篇
  2002年   34597篇
  2001年   64056篇
  2000年   65889篇
  1999年   55663篇
  1998年   14783篇
  1997年   13576篇
  1996年   13014篇
  1995年   12322篇
  1994年   11555篇
  1992年   42831篇
  1991年   41352篇
  1990年   40621篇
  1989年   39637篇
  1988年   37046篇
  1987年   36496篇
  1986年   34963篇
  1985年   33214篇
  1984年   24936篇
  1983年   21127篇
  1982年   12754篇
  1981年   11635篇
  1979年   23982篇
  1978年   17120篇
  1977年   14882篇
  1976年   13413篇
  1975年   15294篇
  1974年   18103篇
  1973年   17581篇
  1972年   16826篇
  1971年   15728篇
  1970年   14928篇
  1969年   14360篇
  1968年   13477篇
  1967年   12033篇
  1966年   11271篇
排序方式: 共有10000条查询结果,搜索用时 328 毫秒
71.
There are an estimated 56 million orphans and vulnerable children across sub-Saharan Africa. Communities typically care for orphan children through informal caring arrangements – either within or outside of kinship networks. Within Kenya, an estimated 250,000 children live on the streets. There is less research related to fostering attitudes of this special population than orphans and vulnerable children generally. Important research over the past decade has illuminated multiple ways in which children are made more vulnerable because of HIV, including parental death and street-migration from HIV-affected households. As HIV transitions from a terminal illness to a chronic, manageable one, research is also required to establish how parents living with HIV can be an asset to children. In this study, we assess whether mothers living with HIV were very willing to foster biologically-related children, and street-involved children, how these fostering attitudes differed from mothers not living with HIV, and whether differences in fostering attitudes by reported HIV status were mediated by social support, family functioning and general self-rated health. Approximately 40% of mothers living with HIV were very willing to provide long-term foster care to biologically-related or street-involved children. This was less than the percentage of mothers not living with HIV, who were very willing to foster biologically-related children (61%) or street-involved children (58%). Significant portions of these differences were explained by social support, family functioning and general self-rated health. Multi-sectoral approaches are suggested by these findings in order to improve the child-fostering capacity of mothers living with HIV. Improving social support, family functioning and general self-rated health among HIV-infected mothers may not only provide protective benefits for the mothers and their children, but also expand the community’s capacity to care for orphan and vulnerable children.  相似文献   
72.
73.
74.
75.
TL1A is a TNF‐like cytokine which has been shown to co‐stimulate TH1 and TH17 responses during chronic inflammation. The expression of this novel cytokine has been investigated in inflammatory disorders like rheumatoid arthritis and inflammatory bowel disease, but little is known about expression and induction in psoriasis. Indeed, the pathogenesis in psoriasis is still not fully understood and it is speculated that cytokines other than TNF‐α are important in subsets of patients. Also, for patients with severe disease that are treated with systemic anti‐TNF‐α blockade, novel candidates to be used as disease and response biomarkers are of high interest. Here, we demonstrate TL1A expression in biopsies from psoriatic lesions. Also, we investigated spontaneous and induced TL1A secretion from PBMCs and blood levels from a cohort of psoriasis patients. Here, increased spontaneous secretion from PBMCs was observed as compared to healthy controls and a small subset of patients had highly elevated TL1A in the blood. Interestingly, activation of PBMCs with various cytokines showed a decreased sensitivity for TL1A activation in psoriasis patients compared to healthy controls.TL1A levels in blood and biopsies could not be correlated with disease activity with this patient cohort. Thus, additional large‐scale studies are warranted to investigate TL1A as a biomarker.  相似文献   
76.
77.
78.
79.
80.
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