全文获取类型
收费全文 | 11518篇 |
免费 | 867篇 |
国内免费 | 24篇 |
专业分类
耳鼻咽喉 | 83篇 |
儿科学 | 377篇 |
妇产科学 | 441篇 |
基础医学 | 1354篇 |
口腔科学 | 301篇 |
临床医学 | 1228篇 |
内科学 | 2798篇 |
皮肤病学 | 296篇 |
神经病学 | 833篇 |
特种医学 | 445篇 |
外国民族医学 | 3篇 |
外科学 | 1633篇 |
综合类 | 178篇 |
一般理论 | 7篇 |
预防医学 | 918篇 |
眼科学 | 402篇 |
药学 | 590篇 |
中国医学 | 7篇 |
肿瘤学 | 515篇 |
出版年
2021年 | 127篇 |
2019年 | 126篇 |
2018年 | 174篇 |
2017年 | 145篇 |
2016年 | 123篇 |
2015年 | 152篇 |
2014年 | 219篇 |
2013年 | 330篇 |
2012年 | 458篇 |
2011年 | 485篇 |
2010年 | 308篇 |
2009年 | 260篇 |
2008年 | 446篇 |
2007年 | 425篇 |
2006年 | 464篇 |
2005年 | 481篇 |
2004年 | 444篇 |
2003年 | 414篇 |
2002年 | 416篇 |
2001年 | 424篇 |
2000年 | 378篇 |
1999年 | 316篇 |
1998年 | 106篇 |
1997年 | 101篇 |
1996年 | 100篇 |
1995年 | 90篇 |
1994年 | 94篇 |
1993年 | 98篇 |
1992年 | 337篇 |
1991年 | 317篇 |
1990年 | 284篇 |
1989年 | 295篇 |
1988年 | 264篇 |
1987年 | 289篇 |
1986年 | 245篇 |
1985年 | 219篇 |
1984年 | 172篇 |
1983年 | 157篇 |
1982年 | 98篇 |
1981年 | 103篇 |
1980年 | 106篇 |
1979年 | 171篇 |
1978年 | 139篇 |
1977年 | 121篇 |
1976年 | 97篇 |
1975年 | 97篇 |
1974年 | 116篇 |
1973年 | 115篇 |
1972年 | 97篇 |
1970年 | 95篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
目的:明确集中的电话干预能否降低慢性心衰门诊患者死亡或因心衰加重而住院的发生率。设计:多中心、随机对照试验。地点:阿根廷的51个中心(包括公立、私立的医院及流动设施)。参与者:1518例患有稳定的慢性心衰且已接受最佳药物治疗方案治疗的门诊患者,由心脏科主治医师分层后随机分为电话干预组和常规治疗组。干预:在常规治疗的基础上,由一个中心通过护士频繁的电话随访对患者进行教育、辅导和监督。主要观察指标:全因死亡或由于心衰加重而住院。结果:99.5%的患者完成了全部随访。常规治疗组758例患者中由于心衰加重而住院或死亡的比例(235… 相似文献
3.
Meir Steiner Richard J. Katz Giulio Baldrighi Bernard J. Carroll 《Psychoneuroendocrinology》1981,6(1):81-90
(1) The estrous cycle in the rat may be used to study recurrent changes in motor behaviors and motivation which are strongly related to cyclic hormonal and CNS changes. (2) The peak in motivated behaviors occurs during a sharply defined period on the night between proestrus and estrus and is evident in facilitated wheel-running, lordosis, and intracranial self-stimulation. (3) Behaviors without a clearly motivated character do not show an estrous cyclicity. (4) The estrous cyclic variation in intracranial self-stimulation was observed at a specific locus — the pars campacta of the substantia nigra. (5) A neurochemical link between sexually motivated behavior, wheel running and intracranial self-stimulation is suggested. This link is in part dopaminergic but is probably also activated by many other systems. 相似文献
4.
R J Katz 《Neuroscience and biobehavioral reviews》1991,15(3):375-381
Intrusive thoughts and images, often of a violent, horrific, or blasphemous nature are the hallmark of Obsessive Compulsive Disorder (OCD). OCD patients frequently also often have reductions in normal serotonergic (5-HT) function. This paper proposes a model of 5-HT function involving the routine filtering and suppression of violent or libidinal impulses. This model accounts for OCD as an instance of failed inhibition. The model also appears to resemble Freud's model of ego-id interactions at least in part, suggesting that it may be possible to psychobiologically substantiate a Freudian metaphor. 相似文献
5.
6.
7.
To evaluate use of a digital photostimulable phosphor imaging system in the neonatal nursery, 150 newborns were divided into three groups of 50. In the first two groups, screen-film and computed radiographs of the chest were obtained at the same radiation exposure; in the third group, computed radiographs were obtained with a 50% dose reduction (half-exposure computed radiographs). All images were blindly evaluated by three readers who scored the quality of visualization of the mediastinum, lung, bone, soft tissues, and endotracheal and nasogastric tubes, and also image density. No statistical differences in visualization of tubes existed among the three groups. Visualization of the mediastinum, lung, bones, and soft tissues was statistically significantly better on computed radiographs than on half-exposure computed radiographs; visualization of the lungs, bones, and soft tissues was statistically significantly better on screen-film radiographs than half-exposure computed radiographs. Image density was statistically better on computed and half-exposure computed radiographs than on screen-film radiographs. 相似文献
8.
9.
10.
In this study we consider the process of the clinical encounter, and present exemplars of how assumptions of both clinicians and their patients can shift or transform in the course of a diagnostic interview. We examine the process as it is recalled, and further elaborated, in post-diagnostic interviews as part of a collaborative inquiry during reflections with clinicians and patients in the northeastern United States. Rather than treating assumptions by patients and providers as a fixed attribute of an individual, we treat them as occurring between people within a particular social context, the diagnostic interview. We explore the diagnostic interview as a landscape in which assumptions occur (and can shift), navigate the features of this landscape, and suggest that our examination can best be achieved by the systematic comparison of views of the multiple actors in an experience-near manner. We describe what might be gained by this shift in assumptions and how it can make visible what is at stake for clinician and patient in their local moral worlds—for patients, acknowledgment of social suffering, for clinicians how assumptions are a barrier to engagement with minority patients. It is crucial for clinicians to develop this capacity for reflection when navigating the interactions with patients from different cultures, to recognize and transform assumptions, to notice ‘surprises’, and to elicit what really matters to patients in their care. 相似文献