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   1349675篇
  免费   103091篇
  国内免费   4457篇
耳鼻咽喉   16969篇
儿科学   44127篇
妇产科学   36758篇
基础医学   199974篇
口腔科学   36102篇
临床医学   130893篇
内科学   261042篇
皮肤病学   26672篇
神经病学   113035篇
特种医学   48704篇
外国民族医学   367篇
外科学   186091篇
综合类   29207篇
现状与发展   1篇
一般理论   483篇
预防医学   117037篇
眼科学   29395篇
药学   99817篇
  8篇
中国医学   3299篇
肿瘤学   77242篇
  2021年   11439篇
  2019年   12102篇
  2018年   16874篇
  2017年   12663篇
  2016年   13651篇
  2015年   15674篇
  2014年   21429篇
  2013年   32951篇
  2012年   45488篇
  2011年   48215篇
  2010年   27849篇
  2009年   25527篇
  2008年   43674篇
  2007年   46093篇
  2006年   46130篇
  2005年   44410篇
  2004年   42335篇
  2003年   40215篇
  2002年   38921篇
  2001年   61135篇
  2000年   62731篇
  1999年   52485篇
  1998年   14667篇
  1997年   13364篇
  1996年   13179篇
  1995年   12520篇
  1994年   11687篇
  1993年   10963篇
  1992年   41691篇
  1991年   40884篇
  1990年   39576篇
  1989年   37487篇
  1988年   34701篇
  1987年   33806篇
  1986年   32251篇
  1985年   30727篇
  1984年   23099篇
  1983年   19641篇
  1982年   11772篇
  1979年   20843篇
  1978年   14827篇
  1977年   12079篇
  1976年   11893篇
  1975年   12136篇
  1974年   14817篇
  1973年   14491篇
  1972年   13374篇
  1971年   12429篇
  1970年   11502篇
  1969年   10418篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.

Background

Arterial vascular anomalies in patients undergoing kidney transplantation (KT) are correlated with a higher incidence of early surgical complications, potentially causing graft loss. Arterial reconstruction allows patients to overcome these surgical challenges, thus minimizing the risk of poor outcomes. The aim of the present study is to retrospectively investigate the safety and effectiveness of the multiple arterial reconstruction technique with a Teflon patch in case of an unavailable aortic patch: to do so, surgical complications, graft function, and patient survival were evaluated.

Methods

During the period January 2009 to August 2016, 202 adult deceased-donor KTs were performed at our center. Group A (n = 27; reconstruction of multiple arteries) and Group B (n = 175; control group) were compared.

Results

No differences were observed between the 2 groups in terms of early postoperative course, with no vascular complication observed in Group A. No vascular patch infections were reported, nor longer cold ischemia time rates. Similarly, long-term survival rates were similar between the 2 groups.

Conclusions

The Teflon-patch arterial reconstruction technique appears to be safe and effective, with an acceptable balance of benefits and potential risks of using a prosthetic material. Studies based on larger series are needed to further validate this approach.  相似文献   
103.
104.
105.
106.
107.
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   
108.
109.
110.
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