Authors:P. Beneš, M. Kuncová, J. Slovák, and P. Ramos
Use of laboratory model experiments for analysis of interaction of radionuclides with surface water solids is connected with methodical problems concerning selection of solid phase, sampling, storage and pretreatment of solid phase, concentration of radionuclide, selection of liquid to solid ratio, adsorption of radionuclide on vessel walls, choice of experimental procedures and change in radionuclide speciation in the solid phase. These problems are discussed on the basis of literature data and of experiments with radiocobalt or radiocesium in a system river water-suspended solids or bottom sediments. Possible ways of solution of the problems are shown. Two modifications of batch method are described in detail and their merits or drawbacks evaluated. Comparison of the modifications shows their possible use as complementary methods for the study of radionuclide behaviour in surface waters.
Authors:Daniela Šátková-Jakabová, J. Trandžík, Ľudmila Hudecová-Kvasňáková, Erika Hegedüšová-Zetochová, A. Bugarský, J. Buleca Jr., L. Zöldág, F. Jakab, and P. Fľak
Genetic variation at six microsatellite loci was analysed for five Thoroughbred subpopulations to determine the magnitude of genetic differentiation and the genetic relationships among the subpopulations. Significant deviations from Hardy-Weinberg equilibrium were shown for a number of locus-population combinations, with all subpopulations. The genetic diversities and relationships of five Thoroughbred subpopulations were evaluated using six microsatellites recommended by the International Society of Animal Genetics (ISAG). The allele frequencies, the effective numbers of alleles, and the observed and expected heterozygosities were calculated. POPGENE v. 1.31 (Yeh et al., 1997) was used to test for deviations from the Hardy-Weinberg (H-W) equilibrium and to assign FIS estimates (Weir, 1990). The utility of microsatellites for evaluating genetic diversity of horses is discussed.
The contamination of leaves of some ornamental and fruit-tree plants (18 species), herbs (6) and early leafy vegetable (2) were assessed in the region of Bratislava and its vicinity through the first months after the Chernobyl accident. The levels of contamination showed local and temporal dependence. In October compared to its levels five months earlier, foliar contamination showed a relative 12- to 200-fold decrease of radioactivity. The effective half-life of the mixture of fission products in cumulative fallout on leaves of vegetation changed depending on time after the accident from 4 days (on day 10) to 150 days (after 2 months). The soluble fraction of radioactive contaminants on plant foliage ranged from 0.12 to 0.64.
Authors:J. Tölgyessy, A. Adámek, V. Kiment, F. Severa, and J. Šácha
On présente quelques résultats obtenus dans la recherche de tracer par activation neutronique, par le département de radiochimie
et de chimie des radiations de l'Université Technique Tchécoslovaque et à l'Institut de Physique de l'Académie des Sciences
Tchécoslovaques, tous deux à Bratislava. L'activation neutronique a été réalisée au moyen d'un réacteur nucléaire et d'un
générateur de neutrons rapides construits dans nos laboratoires.