Authors:J. KŐmives, K. Tomor, J. Sztatisz, L. Lassu, and S. Gál
Changes in the water content of aluminium sulphate hydrate were investigated gravimetrically at room temperature in air with different relative humidities. The samples conditioned in this way were characterized by thermoanalytical (TG, DTG, DSC) and X-ray diffraction measurements. Industrial aluminium sulphate hydrate obtained by freezing the melt has a partly crystalline structure. After grinding, this material crystallizes during storage. This process requires a humid atmosphere; increasing relative humidity brings about more intensive crystallization.
Authors:C. Novák, G. Pokol, K. Tomor, J. Kőmíves, and S. Gál
The gibbsite →χ-alumina decomposition (in air) and theχ-alumina → boehmite transformation (under hydrothermal conditions) were investigated isothermally. Reaction products were characterized by TG and X-ray diffraction.
Authors:J. Kőmives, S. Gál, K. Tomor, and Gy. Kovács
Thermogravimetry was applied in studies of aluminium foils for electrolytic capacitors. Scanning electron microscopy, X-ray diffraction and surface area determination were also used in the interpretation of the results.
Authors:A. Bittsánszky, G. Gyulai, R. Malone, G. Gullner, J. Kiss, M. Czakó, L. Márton, L. Heszky, and T. Kőmíves
As DNA methylation patterns are inherited (‘epigenetic memory’)
I transgenic poplar (
) clones (11
) were treated with the DNA demethylating drug DHAC (5,6-dihydro-5′-azacytidine hydrochloride) at 10
M for 7 days in order to study acquired plant molecular defense mechanisms in novel plant sources. In this study, the response of relative gene expression levels of transgene
I and poplar gene
1 to DHAC treatment were analyzed by qRT-PCR (
ranscriptase PCR). High expression levels of transgene
I were observed in the 6
clone (13.5-fold increase) compared to 11
(1.0) sample. The expression level doubled (1.8-fold increase) in the DHAC-treated 6
samples but not in the 11
clone (0.4-fold). Contrary to this, the relative copy number of transgene
I in the 6
clone was found to be 60% less (1.0) than in the 11
sample (1.6). Relative expression level of endogenous poplar gene
1 showed significantly higher responsiveness to DHAC-induced demethylation than the transgene
I with the highest expression level in the untransformed WT poplar (19.7-fold increase) compared to transformed clones of 6
(8.7-fold increase) and 11
(2.5-fold increase), respectively. Competition in the reactivation capacity between transgene
I and poplar
1 of 6
clone was also observed as the relative gene expression level of transgene
I increased from a high relative expression level (13.5) up by about twofold (1.8 times) rate (to 23.7) compared to poplar
1 gene that increased by an 8.7 increment from a lower level (1.6 rel. expression) to 13.9.