全文获取类型
收费全文 | 11394篇 |
免费 | 802篇 |
国内免费 | 52篇 |
专业分类
耳鼻咽喉 | 82篇 |
儿科学 | 171篇 |
妇产科学 | 113篇 |
基础医学 | 1563篇 |
口腔科学 | 218篇 |
临床医学 | 1116篇 |
内科学 | 2679篇 |
皮肤病学 | 192篇 |
神经病学 | 1338篇 |
特种医学 | 712篇 |
外科学 | 1367篇 |
综合类 | 70篇 |
一般理论 | 17篇 |
预防医学 | 875篇 |
眼科学 | 117篇 |
药学 | 806篇 |
中国医学 | 38篇 |
肿瘤学 | 774篇 |
出版年
2023年 | 53篇 |
2022年 | 121篇 |
2021年 | 252篇 |
2020年 | 154篇 |
2019年 | 241篇 |
2018年 | 266篇 |
2017年 | 203篇 |
2016年 | 234篇 |
2015年 | 289篇 |
2014年 | 393篇 |
2013年 | 512篇 |
2012年 | 764篇 |
2011年 | 804篇 |
2010年 | 499篇 |
2009年 | 464篇 |
2008年 | 752篇 |
2007年 | 766篇 |
2006年 | 665篇 |
2005年 | 643篇 |
2004年 | 572篇 |
2003年 | 491篇 |
2002年 | 490篇 |
2001年 | 173篇 |
2000年 | 168篇 |
1999年 | 182篇 |
1998年 | 131篇 |
1997年 | 99篇 |
1996年 | 89篇 |
1995年 | 94篇 |
1994年 | 61篇 |
1993年 | 77篇 |
1992年 | 124篇 |
1991年 | 109篇 |
1990年 | 129篇 |
1989年 | 99篇 |
1988年 | 87篇 |
1987年 | 87篇 |
1986年 | 85篇 |
1985年 | 71篇 |
1984年 | 54篇 |
1983年 | 43篇 |
1982年 | 46篇 |
1981年 | 59篇 |
1980年 | 46篇 |
1979年 | 39篇 |
1978年 | 40篇 |
1975年 | 31篇 |
1974年 | 38篇 |
1973年 | 36篇 |
1971年 | 32篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
Marcel Toussaint Raymond J. Gilles Noura Azzabou Benjamin Marty Alexandre Vignaud Andreas Greiser Pierre G. Carlier 《Medicine》2015,94(43)
Delayed contrast enhancement after injection of a gadolinium-chelate (Gd-chelate) is a reference imaging method to detect myocardial tissue changes. Its localization within the thickness of the myocardial wall allows differentiating various pathological processes such as myocardial infarction (MI), inflammatory myocarditis, and cardiomyopathies. The aim of the study was first to characterize benign myocarditis using quantitative delayed-enhancement imaging and then to investigate whether the measure of the extracellular volume fraction (ECV) can be used to discriminate between MI and myocarditis.In 6 patients with acute benign myocarditis (32.2 ± 13.8 year-old, subepicardial late gadolinium enhancement [LGE]) and 18 patients with MI (52.3 ± 10.9 year-old, subendocardial/transmural LGE), myocardial T1 was determined using the Modified Look-Locker Imaging (MOLLI) sequence at 3 Tesla before and after Gd-chelate injection. T1 values were compared in LGE and normal regions of the myocardium. The myocardial T1 values were normalized to the T1 of blood, and the ECV was calculated from T1 values of myocardium and blood pre- and post-Gd injection.In both myocarditis and MI, the T1 was lower in LGE regions than in normal regions of the left ventricle. T1 of LGE areas was significantly higher in myocarditis than in MI (446.8 ± 45.8 vs 360.5 ± 66.9 ms, P = 0.003) and ECV was lower in myocarditis than in MI (34.5 ± 3.3 vs 53.8 ± 13.0 %, P = 0.004).Both inflammatory process and chronic fibrosis induce LGE (subepicardial in myocarditis and subendocardial in MI). The present study demonstrates that the determination of T1 and ECV is able to differentiate the 2 histological patterns.Further investigation will indicate whether the severity of ECV changes might help refine the predictive risk of LGE in myocarditis. 相似文献
3.
4.
5.
6.
Jeroen M. van de Pol Jurjen G. Geljon Svetlana V. Belitser Geert W.J. Frederix Anke M. Hövels Marcel L. Bouvy 《Research in social & administrative pharmacy》2019,15(1):70-76
Introduction
The nature of community pharmacy is changing, shifting from the preparation and distribution of medicines to the provision of cognitive pharmaceutical services (CPS); however, often the provision of traditional services leaves little time for innovative services. This study investigated the time community pharmacists spend on the tasks and activities of daily practice and to what extent they are able to implement CPS-related services in daily practice.Methods
Self-reporting work sampling was used to register the activities of community pharmacists. A smartphone application, designed specifically for this purpose, alerted participants to register their current activity five times per working day for 6 weeks. Participants also completed an online survey about baseline characteristics.Results
Ninety-one Dutch community pharmacists provided work-sampling data (7848 registered activities). Overall, 51.5% of their time was spent on professional activities, 35.4% on semi-professional activities, and 13.1% on non-professional activities. The proportion of time devoted to CPS decreased during the workweek, whereas the time spent on traditional task increased.Discussion and conclusion
This study shows it is feasible to collect work-sampling data using smartphone technology. Community pharmacists spent almost half of their time on semi-professional and non-professional activities, activities that could be delegated to other staff members. In practice, the transition to CPS is hampered by competing traditional tasks, which prevents community pharmacists from profiling themselves as pharmaceutical experts in daily practice. 相似文献7.
Although psychoanalysis was the first-choice treatment for premature ejaculation (PE) between 1920 and 1960, hardly any reports on its efficacy have been published. Moreover, a scientific debate about its findings has never been fully developed. The recent progress that has been made in the classification of three different PE syndromes creates a new opportunity for psychoanalytic investigations of men with complaints of PE, distinguished by the actual duration of their intravaginal ejaculation latency time (IELT). The term premature-like ejaculatory dysfunction has been introduced to distinguish men with self-perceived PE at normal and long IELT durations from those men with lifelong, acquired and normal variable PE. Psychoanalytic research may contribute to a better understanding of the consequences of objective early ejaculations on the unconscious mental life of men with the four forms of PE. By integrating neurobiological, clinical and epidemiological data of ejaculatory performance, a revival of psychoanalytic research of PE in the four distinct, classified PE groups, will probably contribute to a deeper insight in to the unconscious mental life of men affected by PE. 相似文献
8.
9.
J.-P. Coudereau Marcel Debray Claire Monier Jean-Marie Bourre Henriette Frances 《Psychopharmacology》1997,130(2):117-123
Morphine (8–100 mg/kg IP) induces place preference conditioning in mice. The effect of two different periods of isolation
(15 and 30 days) was examined. Mice isolated for 15 days but not 30 days exhibited place preference conditioning to morphine
(8 mg/kg). After 30 days of isolation morphine could not induce place preference conditioning with the following doses (8, 16, 64, 100 mg/kg).
Social regrouping of male mice previously isolated for 30 days with naive female mice for 15 or 30 days resulted in a reappearance
of the conditioned place preference to morphine (16 mg/kg). The specificity of this associative deficit was examined by testing
learning in isolated compared to non-isolated mice in two distinct settings: escape learning in the Morris water maze and
passive avoidance acquisition and retention. On the Morris water maze isolated mice did not differ from non-isolated mice
regarding place learning, the probe trial or extinction. Isolated mice were unimpaired in passive avoidance acquisition and
retention. It was concluded that the deficits in place preference conditioning were not the result of a global learning impairment
in isolated mice.
Received: 10 April 1996 /Final version: 20 September 1996 相似文献
10.
Several antisera specific to neuropeptides of vertebrates were applied to sections of the earthworm Eisenia fetida Sav. Some of them were able to reveal specific neurones of the supraoesophageal ganglion: h-GHRF, CRF, Leu- and Met-enkephalin, dynorphin, substance P, CCK-8, and CCK-8S. A map of different areas or nuclei was established in the brain, taking position of reactive cells into account. Four symmetrically paired nuclei and one mediodorsal nucleus were identified and plotted. There is generally no characteristic modification correlated with maturation of the worms. However, the reaction against anti-Leu-enkephalin differs significantly according to age of Eisenia in nucleus No. 1 and particularly in nuclei No. 2 where one cell group presents specific reactivity on and after puberty. Moreover, the successive application of two antisera to the same sections after elution showed no coexistence of substances in a single neurone. By comparison with these vertebrate peptide-like containing nerve cells, the assay to anti-5-HT showed only a few reactive aminergic neurones. An attempt of correlation of cellular types with reactive perikarya is started. 相似文献