Serikzhan A. Badaev

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Humic acids in the form of potassium humate (KH), at concentrations exerting a strong inhibitory effect on the formation of N-methyl-N-nitrosourea (MNU) when present during the nitrosation of N-methylurea (MU) at pH 3, did not reduce the mutagenicity of preformed MNU in Tradescantia, clone 4430. The inhibitory effect of 20 mg/ml KH corresponds approximately(More)
Domains are ordered structures designed to model computation with approximations. We give an introduction to the theory of computability for topological spaces based upon representing topological spaces and algebras using domains. Among the topics covered are: different approaches to computability on topological spaces; orderings, approximations and(More)
Nitrosation of the carbamate insecticide propoxur at pH 3 and 37 degrees C was determined colorimetrically and found to be time- and sodium nitrite concentration-dependent. Nitrosated propoxur was mutagenic when exposed to the seeds of the higher plant Arabidopsis thaliana but the formation of nitrosopropoxur, the presumed mutagen, was inhibited by humic(More)
Fractions of humic acids (HA-K+) of molecular mass between 500 and 300 000 and exceeding 300 000 showed a very high nitrite depleting ability, whereas the fraction of HA-K+ with molecular mass lower than 500 had little or no such effect. Autoclaving HA-K+ (121 °C, 20 min) decreased the nitrite-depleting ability to about a half. This observation correlates(More)
Khutoretskii’s Theorem states that the Rogers semilattice of any family of c.e. sets has either at most one or infinitely many elements. A lemma in the inductive step of the proof shows that no Rogers semilattice can be partitioned into a principal ideal and a principal filter. We show that such a partitioning is possible for some family of d.c.e. sets. In(More)
The data are analyzed on the bilateral asymmetry of the number of dorsal and scutellar chaeta observed under the action of methotrexate in Drosophila of wild strain. It was shown that the incidence of asymmetric specimens induced by methotrexate was abruptly increased as compared to the control. The asymmetry was found to have a statistically significant(More)