Search Results

You are looking at 1 - 10 of 32 items for :

Clear All
Orvosi Hetilap
Authors: Erzsébet Kövesdi, Kinga Hadzsiev, Katalin Komlósi, Mária Kassay, Péter Barsi and Béla Melegh

Dabora, S. L., Jozwiak, S., Franz, D. N., et al.: Mutational analysis in a cohort of 224 tuberous sclerosis patients indicates increased severity of TSC2, compared with TSC1, disease in multiple organs. Am. J. Hum. Genet., 2001, 68 , 64

Open access

Abstract  

Thermally Stimulated Current (TSC) technique is a relaxation technique, such as DMA, but works at very low equivalent frequency (10−3–10−4Hz) and thus clearly resolves the peaks related to the molecular mobility. The effect of orientation on Polypropylene fibers, the relaxation of internal stresses on Polycarbonate disks, and the effect of aging on acrylic airplane windows have been investigated using the TSC method.

Restricted access

Abstract  

Thermally Stimulated Creepe and Current (TSCr and TSC) have been used for investigating the interface/interphase in DGEBA-DDA matrix and glass beads composites. In all samples, a complex α retardation/relaxation mode is observed near the glass transition of the matrix. A study of the fine structure has shown that, for the elastic processes, the activation enthalpies are ranging from 2 and 8 eV, while for the dielectric ones, they are restricted between 0.5 and 1.5 eV. Moreover, for a given activation enthalpy, the preexponential factor τo and the activation entropy ΔS are characteristic of matrix filler interface.

Restricted access

The correlation between structure/microstructure and thermomechanical properties has been investigated by the Thermally Stimulated Creep (TSC) technique in a high performance thermostable thermoset matrix composite. The high resolving power of this technique allows us to analyse the α retardation mode. The kinetics of molecular movements liberated at the glass transition has been investigated by the technique of fractional loading: the analysis of each elementary process gives the real compliance and the retardation time as a function of temperature. The values of the activation parameters show the existence of a compensation phenomenon which characterizes the microstructure. It also gives access to the loss compliance of the composite material as a function of temperature and frequency. The predictive calculation of loss compliance has been validated by the results obtained by dynamic mechanical analysis (DMA).

Restricted access

Summary

On 5 July 2010, preceding the Euralex conference, an international symposium on the role of Terminology Service Centres (TSCs) was organised in Leeuwarden (the Netherlands). The organisers were the Dutch Association for Terminology (NL-TERM) and the Dutch Terminology Service Centre (Dutch TSC). The starting point for the colloquium was a question frame, viz. WHO does WHAT for WHOM, WHEN, WHERE, WHY and HOW. In this paper, the main answers given during and conclusions drawn at the end of the symposium will be presented, together with a plan for the Dutch TSC to proceed and how to further international collaboration between TSCs. In the first section, the problem of knowledge-sharing will be discussed. We will show how cooperation between TSCs could result in the improvement of services provided by these centres, followed by a short discussion of the questions and recommendations presented at the symposium. Finally, the main services of the Dutch TSC will be introduced.

Restricted access
Orvosi Hetilap
Authors: Erzsébet Kövesdi, Judit Bene, Nikoletta Nagy, Ágnes Horváth, Béla Melegh and Kinga Hadzsiev

previously unidentified TSC1 and TSC2 mutations. BMC Med Genet. 2015; 16: 10. 9 DiMario FJ Jr. Brain abnormalities in tuberous sclerosis complex. J Child Neurol. 2004; 19: 650

Restricted access
Orvosi Hetilap
Authors: Erzsébet Kövesdi, Kinga Hadzsiev, Katalin Komlósi, Mária Kassay, Péter Barsi and Béla Melegh
Open access

Abstract  

Dielectric experiments are often performed in non-isothermal conditions. Thus, there is a difference between the temperature of the sample and the sensor temperature. In this work we propose and compare three temperature calibration methods based on the detection of transitions or relaxations: i) the melting of high-purity metallic standards (indium and tin), ii) the 2nd order phase transition of a ferroelectric crystal (TGS); iii) the -relaxation of an amorphous polymer (poly(carbonate)). The results obtained from the three different methods were used to construct a calibration curve for a given heating rate.

Restricted access
Acta Veterinaria Hungarica
Authors: Zhao Namula, Yoko Sato, Manita Wittayarat, Quynh Anh Le, Nhien Thi Nguyen, Qingyi Lin, Maki Hirata, Fuminori Tanihara and Takeshige Otoi

Abstract

This study was conducted to determine the effects of supplementing the maturation medium with the antioxidant curcumin on the in vitro maturation (IVM), fertilisation and development of porcine oocytes. Curcumin supplementation was performed at concentrations of 0, 5, 10, 20, and 40 µM. At concentrations of 5–20 µM, curcumin had significant positive effects (P < 0.05) on maturation and fertilisation rates compared to the non-treated group. Of the groups cultured with 5–20 µM curcumin, the number of oocytes with DNA-fragmented nuclei after IVM was significantly lower than in groups matured without curcumin. Moreover, curcumin supplementation at 10 µM also gave a significantly higher rate of blastocyst formation compared with oocytes matured without curcumin. Increasing the curcumin concentration to 40 µM yielded negative effects on fertilisation and embryonic development compared with the groups treated with lower concentrations of curcumin. Supplementation with 10 µM curcumin had beneficial effects on the oocyte maturation rate and DNA fragmentation index compared to the non-treated group both in the presence and absence of hydrogen peroxide. These results indicate that curcumin supplementation at a suitable concentration (10 µM) is potentially useful for porcine oocyte culture systems, in terms of protecting oocytes from various forms of oxidative stress.

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: N. Fagegaltier, A. Lamure, C. Lacabanne, A. Caron, H. Mifsud and M. Bauer

Thermally Stimulated Current (TSC) spectroscopy and Differential Scanning Calorimetry (DSC) have been applied to the characterization of the microstructure of a pharmaceutical drug.

Restricted access