全文获取类型
收费全文 | 1449篇 |
免费 | 109篇 |
国内免费 | 29篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 59篇 |
妇产科学 | 18篇 |
基础医学 | 215篇 |
口腔科学 | 26篇 |
临床医学 | 137篇 |
内科学 | 223篇 |
皮肤病学 | 50篇 |
神经病学 | 74篇 |
特种医学 | 179篇 |
外科学 | 161篇 |
综合类 | 133篇 |
预防医学 | 51篇 |
眼科学 | 15篇 |
药学 | 137篇 |
1篇 | |
中国医学 | 6篇 |
肿瘤学 | 93篇 |
出版年
2023年 | 11篇 |
2022年 | 14篇 |
2021年 | 33篇 |
2020年 | 30篇 |
2019年 | 33篇 |
2018年 | 35篇 |
2017年 | 30篇 |
2016年 | 37篇 |
2015年 | 36篇 |
2014年 | 54篇 |
2013年 | 58篇 |
2012年 | 81篇 |
2011年 | 66篇 |
2010年 | 65篇 |
2009年 | 66篇 |
2008年 | 71篇 |
2007年 | 81篇 |
2006年 | 75篇 |
2005年 | 40篇 |
2004年 | 50篇 |
2003年 | 28篇 |
2002年 | 40篇 |
2001年 | 27篇 |
2000年 | 24篇 |
1999年 | 20篇 |
1998年 | 43篇 |
1997年 | 41篇 |
1996年 | 48篇 |
1995年 | 29篇 |
1994年 | 23篇 |
1993年 | 21篇 |
1992年 | 13篇 |
1991年 | 12篇 |
1990年 | 15篇 |
1989年 | 33篇 |
1988年 | 23篇 |
1987年 | 16篇 |
1986年 | 27篇 |
1985年 | 19篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 19篇 |
1981年 | 9篇 |
1980年 | 13篇 |
1979年 | 4篇 |
1978年 | 9篇 |
1977年 | 11篇 |
1976年 | 10篇 |
1975年 | 8篇 |
1974年 | 4篇 |
排序方式: 共有1587条查询结果,搜索用时 15 毫秒
1.
S Gunasti† SS Marakli† I Tuncer‡ N Ozpoyraz§ VL Aksungur† 《Journal of the European Academy of Dermatology and Venereology》2007,21(6):811-817
BACKGROUND: We have seen several patients with itchy lichenified plaques located bilaterally on the elbows and/or knees and have named this condition 'psoriatic neurodermatitis' (PN). OBJECTIVE: The purpose of this study was to compare clinical and histopathological characteristics of these patients to those of patients with typical lichen simplex chronicus (LSC). METHODS: Nineteen patients with PN and 34 patients with typical LSC were included. Besides clinical dermatological evaluation, the prick test was carried out on 49 patients; the Phadiatop test on 40 patients; the patch test with European standard series on 47 patients; histopathological evaluation on 39 patients; and clinical psychiatric examination on 38 patients. RESULTS: Almost exclusively, PN was seen in females and was located on the extremities. It caused more plaques than typical LSC did. In PN, the plaques were smaller, sharper, more keratotic and less excoriated, and had fewer lichenoid papules around them. Itching was usually more severe in the evening, while resting and in a hot environment in typical LSC, but not in PN. In plaques of PN, microabscesses in the horny layer, hypogranulosis, regular acanthosis and thinning of the suprapapillary plates were more frequent, and hyperpigmentation in the basal layer was less. In patients with PN, depressive disorder was found more frequently; and generalized anxiety disorder or psychosomatic characteristics, less. There were no significant differences in the results of prick, Phadiatop and patch tests between patients with PN and those with typical LSC. CONCLUSION: In our opinion, it is most likely that the so-called PN is itchy psoriasis superimposed by LSC. 相似文献
2.
3.
Heidi E Kirsch Mary Mantle Srikantan S Nagarajan 《Journal of clinical neurophysiology》2007,24(3):215-231
Both electroencephalography (EEG) and magnetoencephalography (MEG) localize epileptiform activity but may yield different results. This discordance may arise from different detection capabilities or from different data collection and interpretation techniques. Comparisons of MEG and EEG have focused on detection of individual spikes. However, side-by-side comparisons of results as used in the clinical setting is lacking. In this report, we present our empirical comparison. We reviewed 58 simultaneous MEG-EEG recordings (35 paired-sensors, 23 whole-head) from a diverse epilepsy population, comparing previous clinical MEG interpretations with new blinded EEG interpretations, noting lobar concordance of readers' judgments of regional abnormalities. A second-pass unblinded analysis, using all available clinical data, assessed the relative contribution and plausibility of the results of each technique. Concordance was high (85%) overall. Discordance was sometimes caused by constraints imposed by MEG dipole fitting techniques. Even when results of the techniques did not match, MEG often disambiguated the clinical scenario, especially when combined with imaging information. Thoughtful analysis of combined MEG-EEG datasets, beyond algorithm-based interictal spike detection, can help guide clinical decision-making even when concordance between techniques is imperfect. In some cases, EEG and MEG are synergistic and provide complementary information. 相似文献
4.
5.
6.
7.
Srikantan S. Nagarajan Dominique M. Durand Kai Hsuing-Hsu 《Annals of biomedical engineering》1997,25(1):112-125
We determined the location of excitation for different positions of a round and butterfly coil duringin vitro magnetic stimulation of cut peripheral nerves. We analyzed the conditions under which excitation occurs, either at the termination
or at the peak of the field gradients (first spatial derivative of the electric field). These results were then compared to
predictions about the location of excitation sites from a theoretical model of magnetic stimulation of finite neuronal structures.
Excitation along a straight nerve occurred at terminations when 1) a coil was positioned close to the end of a nerve (at least
one diameter length from the end), 2) a nerve ended in a finite terminating impedance much greater than the axial resistance
of the nerve, 3) the induced electric field was of sufficient magnitude, pointing in a direction away from the axis of a nerve.
Excitation occurred at the negative peak of the field gradients along a nerve when 1) a coil was positioned far away from
the ends of a nerve, 2) there were no geometric or volume conductor inhomogeneities around a nerve, and 3) it was of sufficient
magnitude. Threshold strengths for excitation at terminations were significantly lower than that for field gradient excitation
and comparable to that due to geometric and volume conductor inhomogeneities. 相似文献
8.
9.
A. NÆSS 《Scandinavian journal of immunology》1976,5(1-2):165-168
Cerebrospinal fluid (CSF) was allowed to drop straight into Hanks's balanced salt solution. After centrifugation the pellet was resuspended and mixed with sheep erythrocytes. The mixture was further handled as in the E-rosette test with peripheral blood lymphocytes. CSF from 20 individuals were investigated, and rosette-forming cells (RFC) were found in all. Six patients with normal fluid had between 46% and 83% RFC. Four patients with multiple sclerosis had increased numbers of RFC (94%-96%). Low numbers of RFC were found in one patient with cerebellar ataxia and in one of two patients with acute viral meningitis. With this technique RFC can be counted even in normal CSF with a 3-ml sample. 相似文献
10.