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   37390篇
  免费   2705篇
  国内免费   160篇
耳鼻咽喉   283篇
儿科学   1086篇
妇产科学   736篇
基础医学   4682篇
口腔科学   666篇
临床医学   3610篇
内科学   8480篇
皮肤病学   569篇
神经病学   3895篇
特种医学   1157篇
外国民族医学   1篇
外科学   5252篇
综合类   534篇
一般理论   30篇
预防医学   3099篇
眼科学   747篇
药学   2667篇
  1篇
中国医学   55篇
肿瘤学   2705篇
  2023年   243篇
  2022年   361篇
  2021年   735篇
  2020年   490篇
  2019年   729篇
  2018年   826篇
  2017年   631篇
  2016年   693篇
  2015年   832篇
  2014年   1182篇
  2013年   1664篇
  2012年   2463篇
  2011年   2755篇
  2010年   1522篇
  2009年   1404篇
  2008年   2306篇
  2007年   2605篇
  2006年   2470篇
  2005年   2561篇
  2004年   2306篇
  2003年   2197篇
  2002年   2028篇
  2001年   350篇
  2000年   263篇
  1999年   394篇
  1998年   455篇
  1997年   341篇
  1996年   335篇
  1995年   278篇
  1994年   245篇
  1993年   271篇
  1992年   229篇
  1991年   220篇
  1990年   183篇
  1989年   162篇
  1988年   176篇
  1987年   153篇
  1986年   120篇
  1985年   182篇
  1984年   247篇
  1983年   205篇
  1982年   243篇
  1981年   249篇
  1980年   243篇
  1979年   116篇
  1978年   133篇
  1977年   128篇
  1976年   114篇
  1974年   92篇
  1973年   76篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Cancer Causes & Control - Congenital malformations are strong risk factors for childhood cancer. Our objective was to determine whether cancer survival differs by birth defect status among...  相似文献   
2.
3.
4.
Coronary embolism (CE) is an uncommon and unique cause of acute myocardial infarction. In this report, we review 216 cases of CE including 2 new cases from our institution. The mean patient age was 52.5 years and 62% of the patients were males. Chest pain was the most common presenting symptom followed by dyspnea, and the most commonly affected vessel was the left anterior descending artery. Leading etiologies of the embolus were atrial fibrillation, septic emboli, and iatrogenic causes. Treatment approaches varied with thrombus aspiration being used in 30% of cases. In-hospital mortality rate was 36% and 13% of the cases were complicated by cerebrovascular accident. CE is a unique pathology that leads to acute myocardial infarction. It portends a high mortality rate and requires a high level of suspicion as symptoms may be misleading. Further research is needed in order to improve recognition and management and to lower associated mortality.  相似文献   
5.
6.
7.
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   
8.
9.
10.
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