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   1340240篇
  免费   102492篇
  国内免费   4281篇
耳鼻咽喉   16883篇
儿科学   43776篇
妇产科学   36516篇
基础医学   199095篇
口腔科学   36152篇
临床医学   130203篇
内科学   258852篇
皮肤病学   26821篇
神经病学   112707篇
特种医学   48511篇
外国民族医学   366篇
外科学   185126篇
综合类   28856篇
现状与发展   1篇
一般理论   466篇
预防医学   114620篇
眼科学   29141篇
药学   99179篇
  6篇
中国医学   3166篇
肿瘤学   76570篇
  2021年   11085篇
  2019年   11776篇
  2018年   16481篇
  2017年   12414篇
  2016年   13405篇
  2015年   15351篇
  2014年   21043篇
  2013年   32351篇
  2012年   44662篇
  2011年   47259篇
  2010年   27311篇
  2009年   25106篇
  2008年   43047篇
  2007年   45421篇
  2006年   45478篇
  2005年   43931篇
  2004年   41880篇
  2003年   39816篇
  2002年   38607篇
  2001年   60891篇
  2000年   62547篇
  1999年   52336篇
  1998年   14664篇
  1997年   13334篇
  1996年   13174篇
  1995年   12499篇
  1994年   11669篇
  1993年   10970篇
  1992年   41612篇
  1991年   40782篇
  1990年   39478篇
  1989年   37369篇
  1988年   34623篇
  1987年   33731篇
  1986年   32175篇
  1985年   30684篇
  1984年   23065篇
  1983年   19615篇
  1982年   11802篇
  1979年   20838篇
  1978年   14842篇
  1977年   12094篇
  1976年   11896篇
  1975年   12138篇
  1974年   14823篇
  1973年   14492篇
  1972年   13372篇
  1971年   12431篇
  1970年   11506篇
  1969年   10419篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.

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   
102.
103.
104.
105.
106.
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   
107.
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