全文获取类型
收费全文 | 3316篇 |
免费 | 324篇 |
国内免费 | 49篇 |
专业分类
耳鼻咽喉 | 17篇 |
儿科学 | 110篇 |
妇产科学 | 76篇 |
基础医学 | 493篇 |
口腔科学 | 57篇 |
临床医学 | 382篇 |
内科学 | 728篇 |
皮肤病学 | 37篇 |
神经病学 | 199篇 |
特种医学 | 167篇 |
外科学 | 298篇 |
综合类 | 56篇 |
一般理论 | 1篇 |
预防医学 | 540篇 |
眼科学 | 36篇 |
药学 | 299篇 |
1篇 | |
中国医学 | 5篇 |
肿瘤学 | 187篇 |
出版年
2022年 | 22篇 |
2021年 | 41篇 |
2020年 | 34篇 |
2019年 | 39篇 |
2018年 | 57篇 |
2017年 | 51篇 |
2016年 | 56篇 |
2015年 | 59篇 |
2014年 | 72篇 |
2013年 | 134篇 |
2012年 | 129篇 |
2011年 | 167篇 |
2010年 | 89篇 |
2009年 | 75篇 |
2008年 | 159篇 |
2007年 | 201篇 |
2006年 | 174篇 |
2005年 | 171篇 |
2004年 | 156篇 |
2003年 | 124篇 |
2002年 | 132篇 |
2001年 | 108篇 |
2000年 | 98篇 |
1999年 | 100篇 |
1998年 | 101篇 |
1997年 | 84篇 |
1996年 | 78篇 |
1995年 | 64篇 |
1994年 | 49篇 |
1993年 | 53篇 |
1992年 | 55篇 |
1991年 | 62篇 |
1990年 | 41篇 |
1989年 | 59篇 |
1988年 | 65篇 |
1987年 | 64篇 |
1986年 | 55篇 |
1985年 | 37篇 |
1984年 | 27篇 |
1983年 | 31篇 |
1982年 | 21篇 |
1981年 | 20篇 |
1980年 | 23篇 |
1979年 | 25篇 |
1978年 | 27篇 |
1977年 | 18篇 |
1976年 | 16篇 |
1975年 | 18篇 |
1974年 | 22篇 |
1973年 | 16篇 |
排序方式: 共有3689条查询结果,搜索用时 578 毫秒
1.
2.
The bulk of research into drug driving in Australia has been undertaken from a road safety orientation where drug driving is viewed within the broader context of road safety and driver behaviour. Such a specific focus precludes the broader behavioural, contextual and cultural issues associated with substance use. This study aimed to address this issue by focusing on drug driving behaviour within the context of illicit substance use. A series of focused interviews were conducted with 211 illicit drug users from urban and regional centres. A consistent theme identified in the interviews was that drug driving was not necessarily viewed as risky behaviour but rather as an outcome of illicit substance use. Further, some interviewees saw their drug use as enhancing their driving skills and frequently the motor vehicle was viewed as a safe place to use. Overall there was agreement among interviewees that the likelihood of being apprehended for drug driving by police was minimal; this perception was reinforced by past experience. The lack of concern for detection of drug driving behaviour suggests that research should continue into the development and implementation of enforcement programs and roadside detection. 相似文献
3.
4.
The possible role of nerve activity in triggering changes in the localization of acetylcholine receptors (AChRs) and cholinesterase (ChE) on nerve-contacted Xenopus muscle cells has been assessed. The localization of these molecules was examined on nerve-contacted and noncontacted muscle cells in cultures of spinal cord and myotomal muscle derived from Xenopus embryos. Sites of high AChR density were revealed by staining with fluorescent alpha-bungarotoxin and sites of ChE localization were revealed histochemically. Localization of AChRs and ChE at sites of nerve-muscle contact occurred when the culture medium contained 1.2 micron tetrodotoxin (TTX), 1.2 micron TTX, 10 mM magnesium, and no calcium salts, 1.2 micron TTX and 2 mM manganese, or 106 mM potassium methyl sulfate instead of sodium chloride. The nerve-contacted muscle cells in each of these modified culture media also exhibited a reduced incidence of AChR and ChE patches away from the site of contact. It is concluded that the neural factor(s) that triggers the local and remote changes in AChR and ChE distribution can be supplied to the neurites and externalized in the absence of nerve impulses, and that the nerve and muscle cells can interact even when they are largely depolarized. 相似文献
5.
Carel Bron Michel Wensing Jo LM Franssen Rob AB Oostendorp 《BMC musculoskeletal disorders》2007,8(1):107
Background
Shoulder disorders are a common health problem in western societies. Several treatment protocols have been developed for the clinical management of persons with shoulder pain. However available evidence does not support any protocol as being superior over others. Systematic reviews provide some evidence that certain physical therapy interventions (i.e. supervised exercises and mobilisation) are effective in particular shoulder disorders (i.e. rotator cuff disorders, mixed shoulder disorders and adhesive capsulitis), but there is an ongoing need for high quality trials of physical therapy interventions. Usually, physical therapy consists of active exercises intended to strengthen the shoulder muscles as stabilizers of the glenohumeral joint or perform mobilisations to improve restricted mobility of the glenohumeral or adjacent joints (shoulder girdle). It is generally accepted that a-traumatic shoulder problems are the result of impingement of the subacromial structures, such as the bursa or rotator cuff tendons. Myofascial trigger points (MTrPs) in shoulder muscles may also lead to a complex of symptoms that are often seen in patients diagnosed with subacromial impingement or rotator cuff tendinopathy. Little is known about the treatment of MTrPs in patients with shoulder disorders. 相似文献6.
7.
8.
Sodium pentobarbital injections followed 30 min later by d-amphetamine sulfate produce an effect over trials in the form of an increase in heart rate in response to pentobarbital in relation to rats that receive the 2 drugs 24 hr apart (long-delayed control: Revusky, Davey, & Zagorski, 1989). This study found equivalent increases in heart rate in forward and backward groups in relation to a long-delayed control regardless of whether training or testing was carried out in a heart rate recording apparatus or in the home cage, which suggests that a drug interaction due to drug administrations in forward and backward groups has yet to be eliminated in accounting for the heart rate effect. Comparison of backward and long-delayed controls in a drug-drug procedure that used a taste aversion test revealed that both forward and delayed pairings can produce attenuated aversions in relation to a backward group regardless of whether the unconditional stimulus is amphetamine (Experiment 1) or lithium chloride (Experiment 2). 相似文献
9.
Emergency use of the laryngeal mask airway in severe upper airway obstruction caused by supraglottic oedema 总被引:1,自引:1,他引:0
We report two cases of severe upper airway obstruction caused by
supraglottic oedema which developed rapidly at the time of anaesthesia.
Conventional methods to relieve the obstruction failed and it was only
overcome when a laryngeal mask airway (LMA) was inserted and positive
pressure applied manually during inspiration. In one case a fibrescope was
passed via the LMA and this revealed two cushions of oedematous false vocal
cords protruding into the bowel of the LMA which were pushed out of the way
when positive pressure was applied during inspiration. We believe that the
LMA should be considered in the emergency management of severe upper airway
obstruction even when this involves supraglottic oedema.
相似文献
10.
P M Phillips F M Dean J Reffin T P Briggs R A Miller C C Davey 《British journal of urology》1992,70(5):488-491
A study comparing the macular function of both eyes of 130 urological surgeons was carried out to investigate whether the increased light exposure to the endoscoping eye caused any deterioration of macular function. The non-endoscoping eye was used as a control. A sophisticated computer test of colour contrast sensitivity was used. The computer assesses the degree of brightness at which the subject is just able to detect a coloured grating, and for each eye this is expressed as a threshold for the red/green axis and the blue/yellow (tritan) axis. The subjects also completed a questionnaire about their working patterns and their general and ophthalmic history and had a brief examination of the fundus. The results do not suggest that urologists are suffering any significant macular damage as a result of their work with endoscopes. 相似文献