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   1499214篇
  免费   97655篇
  国内免费   3360篇
耳鼻咽喉   21931篇
儿科学   46281篇
妇产科学   43451篇
基础医学   208836篇
口腔科学   44903篇
临床医学   125543篇
内科学   290847篇
皮肤病学   33806篇
神经病学   115999篇
特种医学   63011篇
外国民族医学   517篇
外科学   232698篇
综合类   32009篇
现状与发展   6篇
一般理论   438篇
预防医学   106390篇
眼科学   35016篇
药学   111149篇
  6篇
中国医学   3130篇
肿瘤学   84262篇
  2018年   15037篇
  2017年   13194篇
  2016年   13556篇
  2015年   16384篇
  2014年   20664篇
  2013年   28453篇
  2012年   41899篇
  2011年   39298篇
  2010年   22857篇
  2009年   23809篇
  2008年   35637篇
  2007年   39401篇
  2006年   40167篇
  2005年   46422篇
  2004年   46913篇
  2003年   41762篇
  2002年   36868篇
  2001年   66569篇
  2000年   66525篇
  1999年   59349篇
  1998年   15166篇
  1997年   13765篇
  1996年   13284篇
  1995年   12548篇
  1992年   47616篇
  1991年   46433篇
  1990年   45922篇
  1989年   44666篇
  1988年   41680篇
  1987年   41095篇
  1986年   39352篇
  1985年   37047篇
  1984年   27565篇
  1983年   23262篇
  1982年   13457篇
  1981年   12202篇
  1979年   26849篇
  1978年   18898篇
  1977年   16184篇
  1976年   14647篇
  1975年   17203篇
  1974年   20572篇
  1973年   19769篇
  1972年   18974篇
  1971年   17989篇
  1970年   17011篇
  1969年   16372篇
  1968年   15342篇
  1967年   13850篇
  1966年   12902篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
45.
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   
46.
47.
48.
Attachment is a behavioral and physiological system, which enables individual’s dynamic adaptation to its environment. Attachment develops in close interaction between an infant and his/her mother, plays an important role in the development of the infant’s brain, and influences the quality of interpersonal relationships throughout life.Security of attachment is believed to influence individual response to stress, exposing insecurely organized individuals to deregulated autonomic nervous system and exaggerated hypothalamic-pituitary-adrenal activity, which, in turn, produces increased and prolonged exposure to stress-hormones. Such stress responses may have considerable implications for the development of diverse health-risk conditions, such as insulin resistance and hyperlipidemia, shown by numerous studies.Although the mechanisms are not yet fully understood, there is compelling evidence highlighting the role of psychological stress in the development of type 1 diabetes (T1D). One of the possible contributing factors for the development of T1D may be the influence of attachment security on individual stress reactivity. Thus, the suggestion is that insecurely attached individuals are more prone to experience increased and prolonged influence of stress hormones and other mechanisms causing pancreatic beta-cell destruction.The present paper opens with a short overview of the field of attachment in children, the principal attachment classifications and their historic development, describes the influence of attachment security on individual stress-reactivity and the role of the latter in the development of T1D. Following is a review of recent literature on the attachment in patients with T1D with a conclusion of a proposed role of attachment organization in the etiology of T1D.  相似文献   
49.
50.
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