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   1349158篇
  免费   103252篇
  国内免费   4288篇
耳鼻咽喉   16954篇
儿科学   44204篇
妇产科学   36953篇
基础医学   199860篇
口腔科学   36087篇
临床医学   131733篇
内科学   260548篇
皮肤病学   26760篇
神经病学   113496篇
特种医学   48515篇
外国民族医学   366篇
外科学   185591篇
综合类   28959篇
现状与发展   1篇
一般理论   494篇
预防医学   116618篇
眼科学   29195篇
药学   99825篇
  6篇
中国医学   3182篇
肿瘤学   77351篇
  2021年   11461篇
  2019年   12241篇
  2018年   16901篇
  2017年   12734篇
  2016年   13708篇
  2015年   15712篇
  2014年   21470篇
  2013年   33054篇
  2012年   45732篇
  2011年   48465篇
  2010年   27911篇
  2009年   25680篇
  2008年   43850篇
  2007年   46336篇
  2006年   46287篇
  2005年   44543篇
  2004年   42424篇
  2003年   40283篇
  2002年   38993篇
  2001年   60935篇
  2000年   62557篇
  1999年   52340篇
  1998年   14695篇
  1997年   13344篇
  1996年   13165篇
  1995年   12511篇
  1994年   11659篇
  1993年   10949篇
  1992年   41590篇
  1991年   40779篇
  1990年   39461篇
  1989年   37354篇
  1988年   34602篇
  1987年   33712篇
  1986年   32172篇
  1985年   30650篇
  1984年   23048篇
  1983年   19603篇
  1982年   11765篇
  1979年   20814篇
  1978年   14817篇
  1977年   12066篇
  1976年   11879篇
  1975年   12111篇
  1974年   14806篇
  1973年   14479篇
  1972年   13357篇
  1971年   12419篇
  1970年   11486篇
  1969年   10410篇
排序方式: 共有10000条查询结果,搜索用时 15 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