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   1344745篇
  免费   103295篇
  国内免费   4656篇
耳鼻咽喉   16985篇
儿科学   43843篇
妇产科学   36618篇
基础医学   199249篇
口腔科学   36468篇
临床医学   130750篇
内科学   259985篇
皮肤病学   26523篇
神经病学   112606篇
特种医学   48472篇
外国民族医学   369篇
外科学   185564篇
综合类   29820篇
现状与发展   2篇
一般理论   461篇
预防医学   115089篇
眼科学   29282篇
药学   99952篇
  12篇
中国医学   3515篇
肿瘤学   77131篇
  2021年   11374篇
  2019年   12057篇
  2018年   16779篇
  2017年   12676篇
  2016年   13614篇
  2015年   15756篇
  2014年   21465篇
  2013年   32749篇
  2012年   45101篇
  2011年   47776篇
  2010年   27764篇
  2009年   25445篇
  2008年   43375篇
  2007年   45699篇
  2006年   45765篇
  2005年   44136篇
  2004年   42027篇
  2003年   39877篇
  2002年   38639篇
  2001年   61043篇
  2000年   62689篇
  1999年   52442篇
  1998年   14693篇
  1997年   13392篇
  1996年   13207篇
  1995年   12516篇
  1994年   11701篇
  1993年   10992篇
  1992年   41643篇
  1991年   40832篇
  1990年   39516篇
  1989年   37393篇
  1988年   34629篇
  1987年   33728篇
  1986年   32176篇
  1985年   30658篇
  1984年   23052篇
  1983年   19600篇
  1982年   11759篇
  1979年   20814篇
  1978年   14819篇
  1977年   12075篇
  1976年   11880篇
  1975年   12113篇
  1974年   14806篇
  1973年   14473篇
  1972年   13357篇
  1971年   12419篇
  1970年   11488篇
  1969年   10412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