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   1411484篇
  免费   113249篇
  国内免费   3332篇
耳鼻咽喉   18360篇
儿科学   46555篇
妇产科学   41061篇
基础医学   200863篇
口腔科学   37692篇
临床医学   126020篇
内科学   284490篇
皮肤病学   33358篇
神经病学   116888篇
特种医学   53844篇
外国民族医学   464篇
外科学   210696篇
综合类   32756篇
现状与发展   3篇
一般理论   487篇
预防医学   110012篇
眼科学   31497篇
药学   98510篇
  1篇
中国医学   3347篇
肿瘤学   81161篇
  2021年   10858篇
  2019年   11674篇
  2018年   16582篇
  2017年   12672篇
  2016年   14260篇
  2015年   16012篇
  2014年   22569篇
  2013年   33410篇
  2012年   45397篇
  2011年   47943篇
  2010年   28172篇
  2009年   27050篇
  2008年   44319篇
  2007年   46839篇
  2006年   47393篇
  2005年   45863篇
  2004年   43755篇
  2003年   41708篇
  2002年   40196篇
  2001年   73011篇
  2000年   74543篇
  1999年   61571篇
  1998年   16997篇
  1997年   15438篇
  1996年   15590篇
  1995年   14793篇
  1994年   13402篇
  1993年   12590篇
  1992年   45860篇
  1991年   43494篇
  1990年   41510篇
  1989年   39564篇
  1988年   36194篇
  1987年   35371篇
  1986年   32870篇
  1985年   31284篇
  1984年   23828篇
  1983年   20032篇
  1982年   12215篇
  1981年   10786篇
  1979年   20710篇
  1978年   14584篇
  1977年   12086篇
  1976年   11366篇
  1975年   11628篇
  1974年   13995篇
  1973年   13544篇
  1972年   12643篇
  1971年   11478篇
  1970年   10913篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
43.
44.
45.
ABSTRACT

Communication between health professionals and patients is an intergroup phenomenon where the health professional has the most power and status. Over the past few decades, there has been a steady increase in the availability to patients of information about healthcare and specific diseases on the Internet. In this paper, we ask whether the use of Internet health information assists patients to manage their consultations with health professionals better and whether it alters the intergroup dynamic by providing a more equal status for patients. In this study 370 participants from Australia and Canada completed a survey that included a ‘willingness to communicate with health professionals’ scale. They also commented on their use and trust of Internet health information. Thematic analysis suggests that patients’ use of Internet health information serves as a broker between patients and their health provider in health consultations. We discuss the implications of these findings for health practitioners as they address how easier Internet access influences patient interactions with health professionals. We consider future research directions these finding provide in explaining communication behaviour in this context.  相似文献   
46.
47.
48.
At this study a multi-criteria model was developed to examine the available procedures, techniques and methods of handling infectious waste in the large healthcare unit of University Regional General Hospital of Patras, Western Greece. Particularly, this study examined the: a) current legislation and Directives issued for medical waste management at Greece and among the other EU-members, b) contribution of healthcare wastes (HCW) generation rate on social and economic parameters in selected European countries, c) available procedures, techniques, and methods upon the disposal of infectious wastes at the healthcare studied, and, d) propositions for integrated management of such hazardous wastes. Specifically, the Analytic Hierarchy Process (AHP) methodology was applied under pair wise comparison matrices in two stages: 1) the scale factors and the indicators, and 2) the criteria and their sub–criteria. The assessment of these pair wise matrices included the indicators and the sub–criteria. Subsequently, two pair wise comparison matrices, upon a) the “Fulfillment of environmental objectives” indicator and b) the “Energy consumption” sub criterion, were denoted. The AHP methodology yielded good results; however there is still space of improving the environmental performance. The normalized relative weights obtained for the criteria and sub criteria motivated specific actions that have to be handled. Particularly, the results indicated a very good value in environmental management criteria due the values obtained for the commitment towards the environmental policy standards and the waste management procedures. However, further improvements on staff awareness (such as development programs to enhance sensitivity) and more green purchasing suppliers, should be further addressed.  相似文献   
49.
50.
First described in 1955 in New Jersey, epizootic haemorrhagic disease (EHD) causes a severe clinical disease in wild and domestic ruminants worldwide. Epizootic haemorrhagic disease outbreaks occur in deer populations each year from summer to late autumn. The etiological agent is EHD virus (EHDV) which is a double‐stranded segmented icosahedral RNA virus. EHD virus utilizes point mutations and reassortment strategies to maintain viral fitness during infection. In 2018, EHDV serotype 2 was predominantly detected in deer in Illinois. Whole genome sequencing was conducted for two 2018 EHDV2 isolates (IL41747 and IL42218) and the sequence analyses indicated that IL42218 was a reassortant between different serotypes whereas IL41747 was a genetically stable strain. Our data suggest that multiple strains contribute to outbreaks each year.  相似文献   
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