全文获取类型
收费全文 | 640篇 |
免费 | 59篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 53篇 |
妇产科学 | 4篇 |
基础医学 | 69篇 |
口腔科学 | 13篇 |
临床医学 | 111篇 |
内科学 | 100篇 |
皮肤病学 | 2篇 |
神经病学 | 20篇 |
特种医学 | 162篇 |
外科学 | 33篇 |
综合类 | 13篇 |
预防医学 | 39篇 |
眼科学 | 11篇 |
药学 | 31篇 |
中国医学 | 2篇 |
肿瘤学 | 36篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 5篇 |
2019年 | 2篇 |
2018年 | 7篇 |
2017年 | 8篇 |
2016年 | 4篇 |
2015年 | 10篇 |
2014年 | 8篇 |
2013年 | 13篇 |
2012年 | 10篇 |
2011年 | 14篇 |
2010年 | 14篇 |
2009年 | 15篇 |
2008年 | 12篇 |
2007年 | 32篇 |
2006年 | 18篇 |
2005年 | 12篇 |
2004年 | 11篇 |
2003年 | 17篇 |
2002年 | 15篇 |
2001年 | 10篇 |
2000年 | 15篇 |
1999年 | 17篇 |
1998年 | 41篇 |
1997年 | 63篇 |
1996年 | 44篇 |
1995年 | 33篇 |
1994年 | 34篇 |
1993年 | 25篇 |
1992年 | 13篇 |
1991年 | 11篇 |
1990年 | 4篇 |
1989年 | 18篇 |
1988年 | 20篇 |
1987年 | 16篇 |
1986年 | 22篇 |
1985年 | 19篇 |
1984年 | 9篇 |
1983年 | 6篇 |
1982年 | 11篇 |
1981年 | 6篇 |
1980年 | 9篇 |
1978年 | 6篇 |
1977年 | 10篇 |
1976年 | 4篇 |
1975年 | 5篇 |
1911年 | 2篇 |
1909年 | 2篇 |
1908年 | 1篇 |
排序方式: 共有707条查询结果,搜索用时 15 毫秒
71.
Lisanne M Verweij Karin I Proper Andre NH Weel Carel TJ Hulshof Willem van Mechelen 《BMC public health》2009,9(1):461-17
Background
Occupational health professionals may play an important role in preventive health promotion activities for employees. However, due to a lack of knowledge and evidence- and practice based methods and strategies, interventions are hardly being implemented by occupational physicians to date. The aim of the Balance@Work project is to develop, evaluate, and implement an occupational health guideline aimed at the prevention of weight gain among employees. 相似文献72.
In 2006, the Ministry of Defense of the Netherlands initiated a targeted agenda program for the World Congress on Disaster and Emergency Medicine in Amsterdam in 2007 (15WCDEM). The issue to be discussed was if there is one "golden" treatment and evacuation system that is applicable for different military and civilian situations. And, if there is not such a system, which parameters are important to construct the most optimal system for each different situation. This issue is related to the applicability and evidence base of the standards of the North Atlantic Treaty Organization. A group of experts started a website discussion on the issue during December 2006. During the 15WCDEM, several other participants were active in the discussion. Using the different experiences and the outcome of the discussions, it was concluded that there is not one "golden" medical emergency system, there are no "golden" timelines, and no "golden" skills. A medical system should be flexible and be able to adjust on each specific, local situation. First responder and non-medical people with medical skills (first responders) are essential in the front line of the emergency medical systems. More research is needed on the medical techniques and skills that are most effective early in the treatment and evacuation systems. Lessons learned from the military system are relevant for the civilian emergency medical services and vice-versa. The World Association for Disaster and Emergency Medicine can be an important platform to share and exchange information between these two systems. The target of the platform should be to obtain a generic picture of the important elements in prehospital emergency medical care. 相似文献
73.
74.
Visual identification of bacterially contaminated red cells 总被引:1,自引:0,他引:1
There have been increasing numbers of reports of transfusion-acquired Yersinia enterocolitica bacteremia (including several fatal cases). Fifteen units of whole blood were inoculated with various concentrations of Y. enterocolitica serotype 0:3 and processed into AS-3 preserved red cells (RBCs). Consistent growth of the organism was found at inoculum concentrations greater than or equal to 10 colony-forming units per mL. In all 13 units of RBCs that supported the growth of Y. enterocolitica, a darkening in color (due to hemolysis and a decrease in pO2) was observed in the bag. The attached sample segments, which were sealed from the main unit, remained sterile and did not darken. This color change was apparent in all the contaminated units by Day 35, which was 1.5 to 2 weeks after the bacteria were first detected in cultures of the blood. Hence, by comparison of the color of the segment tubing with that of the unit itself, units grossly contaminated with Y. enterocolitica can be identified prior to transfusion. Moreover, review of photographs on file at the Centers for Disease Control revealed this dramatic color change in 2 units of blood that caused transfusion-transmitted sepsis (Enterobacter agglomerans and an unidentified gram-negative bacillus, not Yersinia sp.), which demonstrated that the color change was not limited to Y. enterocolitica. This method of visual identification of contaminated units of blood could decrease the incidence of posttransfusion bacterial sepsis. 相似文献
75.
Effects of cholinergic modulation on responses of neocortical neurons to fluctuating input 总被引:1,自引:0,他引:1
Neocortical neurons in vivo are spontaneously active and intracellular
recordings have revealed strongly fluctuating membrane potentials arising
from the irregular arrival of excitatory and inhibitory synaptic
potentials. In addition to these rapid fluctuations, more slowly varying
influences from diffuse activation of neuromodulatory systems alter the
excitability of cortical neurons by modulating a variety of potassium
conductances. In particular, acetylcholine, which effects learning and
memory, reduces the slow alterhyperpolarization, which contributes to spike
frequency adaptation. We used whole-cell patch-clamp recordings of
pyramidal neurons in neocortical slices and computational simulations to
show, first, that when fluctuating inputs were added to a constant current
pulse, spike frequency adaptation was reduced as the amplitude of the
fluctuations was increased. High- frequency, high-amplitude fluctuating
inputs that resembled in vivo conditions exhibited only weak spike
frequency adaptation. Second, bath application of carbachol, a cholinergic
agonist, significantly increased the firing rate in response to a
fluctuating input but minimally displaced the spike times by < 3 ms,
comparable to the spike jitter observed when a visual stimulus is repeated
under in vivo conditions. These results suggest that cholinergic modulation
may preserve information encoded in precise spike timing, but not in
interspike intervals, and that cholinergic mechanisms other than those
involving adaptation may contribute significantly to cholinergic modulation
of learning and memory.
相似文献
76.
77.
Bruce Bolam Darrin Hodgetts Kerry Chamberlain Simon Murphy Kate Gleeson 《Critical public health》2003,13(1):15-31
Recent interest in health inequalities research has focused upon psychosocial factors such as a sense of control. Previous work has sought to measure or describe personal beliefs about control over health without addressing the contradictory and rhetorical dimensions of such accounts. These issues are explored through an analysis of interviews with 30 lower socioeconomic status (SES) participants drawn from two qualitative studies of health inequalities. Key findings concern the rhetorical construction and interweaving of two contrasting positions regarding control over health: fatalism and positive thought. Fatalistic talk provided a means by which participants acknowledged their limited control over health, although not in an exclusively negative manner. Talk about thinking positively enabled participants to present themselves as having agency in the face of adversity. The creative interweaving of these two positions in accounts of control over health enabled participants to navigate the moral imperative of responsibility for health in the context of adverse and capricious circumstance. By foregrounding the social character of accounts of control the significance of moral and ethical dimensions for health inequalities research and practice are highlighted. 相似文献
78.
79.
80.