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  • Author or Editor: J. Kozák x
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Authors: M. Jasińska, K. Kozak, J. Mietelski, J. Barszcz and J. Greszta

Abstract  

Experimental data of caesium and ruthenium radioactivity in chosen parts of forest ecosystems in Finland and Southern Poland are presented and compared. Measurements were performed with a low-background -spectrometer coupled with a Ge/Li/ detector. The maximum caesium-137 activity in litter from Poland is 2.5 kBq, in that from Finland 3.9 kBq, in spruce needles it is 0.4 kBq /Poland/, 0.9 kBq /Finland/ and in fern leaves it is as high as 15.9 kBq per kg of dry mass in one sample from Poland.

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Authors: M. Drábik, T. Kozák, D. Ležal, M. Poulain and J. Kalužný

Abstract  

The present study shows the dependence of the temperature of glass transition — T g upon the presence and quantity of doping Pr atoms. Substantial effect of the form — chemical nature of compound from which the doping atoms are incorporated into the glass has been displayed as well. With the increase of the content of sulfidic form T g values approach the level of undoped glasses. Thus, if the studied glasses are doped by sulfidic form, bonded areas atoms of Pr so atoms of S. Glasses doped by halogenous source of Pr behave differently; the shift of the T g value does not change with the amount of the dopand, displaying the anion deficiency of glass stoichiometry in studied interval of halogenous dopands. Generally, a very slight non-stability of the glass against the oxidation in temperature region of glass transition is observed.

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Authors: J. Janan, L. Bárdos, Mária Karsai, Gabriella Ágota, Péter Rudas, J. Kozák and L. Bódi

The susceptibility of geese of different genotypes and sexes to force-feeding, some plasma biochemical parameters (thyroid hormones, cholesterol, retinoids, total protein and albumin) of force-fed geese, and the relationship between force-feeding, fat storage and the above-mentioned parameters were studied. Sixty (30 male and 30 female) geese of three genotypes (Hungarian, Landes and their crossbred called Babat Hybrid) were divided in two groups at 12 weeks of age. Geese in one group (5 males and 5 females from each genotype) received mixed feedingad libitum. Birds in the other group were force-fed with maize. After 3 weeks all birds were bled, blood samples were taken, and the above-mentioned plasma parameters were determined. Thyroxine (T4) levels were significantly lower in force-fed (11.6 ± 3.5 ng/ml) than in control geese (22.7 ± 4.09 ng/ml). Plasma triiodothyronine (T3) level was also lower in the force-fed than in the control group, but the difference was not significant (1.87 ± 0.23 ng/ml and 2.11 ± 0.28 ng/ml, respectively). Plasma total protein (TP, 45.2 ± 4.5 g/l), albumin (ALB, 16.51 ± 2.8 g/l), (-carotene (BC, 3504 ± 3107 µg/l), retinol (ROL, 1160 ± 505 µg/l), retinyl palmitate (RP, 1745 ± 405 µg/l) and total cholesterol (TCh, 4.32 ± 0.55 mmol/l) levels were elevated in the force-fed group as compared to the control (TP = 36.4 ± 5.1 g/l, ALB = 15.6 ± 0.9 g/l, BC = 1657 ± 1681 µg/l, ROL = 687 ± 375 µg/l, RP = 1398 ± 607 µg/l, and TCh = 2.83 ± 1.98 mmol/l). All differences were significant except those found for albumin and (-carotene. No significant sex- or genotype-related effects were observed for these parameters.

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