全文获取类型
收费全文 | 622篇 |
免费 | 34篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 7篇 |
妇产科学 | 7篇 |
基础医学 | 70篇 |
口腔科学 | 17篇 |
临床医学 | 36篇 |
内科学 | 109篇 |
皮肤病学 | 102篇 |
神经病学 | 57篇 |
特种医学 | 64篇 |
外科学 | 75篇 |
综合类 | 11篇 |
一般理论 | 1篇 |
预防医学 | 19篇 |
眼科学 | 21篇 |
药学 | 50篇 |
中国医学 | 1篇 |
肿瘤学 | 12篇 |
出版年
2023年 | 3篇 |
2021年 | 9篇 |
2020年 | 6篇 |
2019年 | 10篇 |
2018年 | 18篇 |
2017年 | 11篇 |
2016年 | 12篇 |
2015年 | 14篇 |
2014年 | 24篇 |
2013年 | 28篇 |
2012年 | 46篇 |
2011年 | 36篇 |
2010年 | 30篇 |
2009年 | 26篇 |
2008年 | 43篇 |
2007年 | 62篇 |
2006年 | 38篇 |
2005年 | 24篇 |
2004年 | 19篇 |
2003年 | 14篇 |
2002年 | 14篇 |
2001年 | 15篇 |
2000年 | 7篇 |
1999年 | 3篇 |
1998年 | 8篇 |
1997年 | 11篇 |
1996年 | 10篇 |
1995年 | 7篇 |
1994年 | 18篇 |
1993年 | 15篇 |
1992年 | 6篇 |
1991年 | 6篇 |
1990年 | 2篇 |
1989年 | 10篇 |
1988年 | 9篇 |
1987年 | 15篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1981年 | 3篇 |
1980年 | 9篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有668条查询结果,搜索用时 31 毫秒
1.
MR compatibility of Guglielmi detachable coils 总被引:6,自引:0,他引:6
2.
Adverse reaction to intravenous gadoteridol 总被引:1,自引:0,他引:1
3.
M. Sand T. Gambichler G. Moussa F. G. Bechara D. Sand P. Altmeyer K. Hoffmann 《Skin research and technology》2006,12(2):114-118
BACKGROUND/AIMS: It has recently been proposed that the refractive index (RI) measured by means of optical coherence tomography (OCT) may be a valid measure for hydration of skin. In this pilot study, using OCT in vivo, we aimed to investigate the interday variability of RI measurements and acute changes of RI following the application of a moisturizer. METHODS: Twenty healthy Caucasian volunteers were investigated on their forearms using a commercially available OCT system (SkinDex 300, ISIS optronics GmbH, Mannheim, Germany) fitted with an integrated algorithm for the evaluation of the RI. The interday repeatability of the OCT method was determined performing symmetrical measurements on both forearms on day 1, 5, 9, and 13. In order to investigate the acute effect of a moisturizer on RI, OCT assessments were performed before and 10 min after the application of an aqueous lotion with a lipophilic phase. As a control, the contralateral site was investigated in the same way, except for the use of distilled water instead of the lotion. RESULTS: Assessments of interday variability revealed insignificant (P>0.05) variances between the four measurement times as expressed in very small repeatability coefficients (right arm: 0.039; left arm 0.053) and small coefficients of variance (right arm: 1.02%; left arm: 1.38%). With regard to the RIs measured over time, we could not observe significant (P>0.05) differences between the two symmetrical anatomic sites (mean+/-SD of RI: 1.3893+/-0.0142 (right arm); 1.3875+/-0.0192 (left arm)). The acute effect of the moisturizer was indicated by a significant decrease of the RI 5 min after the application of the lotion (1.399+/-0.01 vs. 1.387+/-0.02; difference between means: 0.012; P=0.033; 95% confidence interval: 0.001-0.0023). However the control site treated with distilled water did not show significant differences between the two measurement times (1.387+/-0.013 vs. 1.391+/-0.023; difference between means: -0.004; P=0.57; 95% confidence interval: -0.019-0.011). CONCLUSIONS: In this pilot study, we have demonstrated that RI evaluation via OCT is a promising technique that may be used for the assessment of skin hydration in vivo. However, the direct comparison of OCT with standard methods, ideally such as nuclear magnetic resonance spectroscopy, is necessary. 相似文献
4.
5.
The patellofemoral joint was imaged with magnetic resonance (MR) in the axial plane while the knee was positioned from 0 degrees to 32 degrees of flexion (nine positions). These multiple sequential images obtained within the early phases of flexion of the knee were viewed in a "cine-loop" format, producing a kinematic study that clearly demonstrated the relationship of the patella to the trochlear groove. Four healthy subjects and one patient with known bilateral subluxing patellae were studied. The preliminary results suggest that kinematic MR imaging of the patellofemoral joint is potentially useful for the evaluation of patellar tracking abnormalities. 相似文献
6.
Background: Interendothelial tight junctions and gap junctions have been described in large blood vessels and in cultures of endothelium derived from large blood vessels. Transfer of microinjected smallmolecular weight tracers between adjacent endothelial cells also has been demonstrated indicating the presence of gap junctional interendothelial communication. Similar transfer of tracers is evident between microvessel endothelial cells in culture and in microvessels in situ. However, gap junctions have not been detectable by electron microscopy of intact capillary systems. This may be due to limited sampling available in diffuse capillary systems and a small area of overlap between adjacent endothelial membranes. Methods: Thin slices of the parallel, tightly packed capillary bed of the eel rete mirabile were cryofixed and prepared for conventional TEM by freeze substitution. Other samples were freeze-fractured and replicated for examination of endothelial junctional components. Results: A novel tight-gap junctional complex between rete capillary endothelial cells is described. In freeze-fracture replicas of the membrane P face, rows of gap junction subunits are flanked on either side by linear depressions representing grooves previously occupied by tight junctional strands that partition to the E face. In thin sections, the junctions appear in profile as short lengths of closely apposed membranes characteristic of gap junctions. Conclusions: The tight junctional components imply a barrier to paracellular transport across the capillary wall between the endothelial cells. The gap junctional component may provide a mechanism for communication between endothelial cells along the length of the vessel wall. © 1995 Wiley-Liss, Inc. 相似文献
7.
Altered epigenetic pathways and cell cycle dysregulation in healthy appearing skin of patients with koebnerized squamous cell carcinomas following skin surgery
下载免费PDF全文
![点击此处可从《Journal of the European Academy of Dermatology and Venereology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
8.
9.
10.