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   1347296篇
  免费   103504篇
  国内免费   4255篇
耳鼻咽喉   16912篇
儿科学   44089篇
妇产科学   36913篇
基础医学   199784篇
口腔科学   36158篇
临床医学   131226篇
内科学   260738篇
皮肤病学   26514篇
神经病学   112902篇
特种医学   48557篇
外国民族医学   366篇
外科学   186038篇
综合类   29248篇
现状与发展   1篇
一般理论   500篇
预防医学   116099篇
眼科学   29225篇
药学   99846篇
  6篇
中国医学   3180篇
肿瘤学   76753篇
  2021年   11118篇
  2019年   11853篇
  2018年   16547篇
  2017年   12484篇
  2016年   13415篇
  2015年   15388篇
  2014年   21100篇
  2013年   32533篇
  2012年   44858篇
  2011年   47623篇
  2010年   27466篇
  2009年   25277篇
  2008年   43298篇
  2007年   45682篇
  2006年   45767篇
  2005年   44215篇
  2004年   42112篇
  2003年   40056篇
  2002年   38844篇
  2001年   61279篇
  2000年   62951篇
  1999年   52663篇
  1998年   14777篇
  1997年   13442篇
  1996年   13285篇
  1995年   12620篇
  1994年   11758篇
  1993年   11045篇
  1992年   41895篇
  1991年   41118篇
  1990年   39780篇
  1989年   37651篇
  1988年   34858篇
  1987年   33966篇
  1986年   32422篇
  1985年   30893篇
  1984年   23251篇
  1983年   19770篇
  1982年   11859篇
  1979年   20943篇
  1978年   14922篇
  1977年   12169篇
  1976年   11974篇
  1975年   12201篇
  1974年   14949篇
  1973年   14603篇
  1972年   13463篇
  1971年   12519篇
  1970年   11597篇
  1969年   10505篇
排序方式: 共有10000条查询结果,搜索用时 31 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