Vol. 41 No. 1 (212) (2007)

Copper (II) chloride and nitrate complexes in diethylsulfoxide (DESO) solutions have been investigated by means of UV-Vis spectroscopy. A new absorption band at about 300 nm of maximal absorption due to the formation of the charge-transfer complex between copper (II) and DESO has been detected. The results obtained were compared with those for dimethylsulfoxide (DMSO) known also from literature. Derivative spectroscopy approach has been used to determine the number and positions of overlapping bands. Based on the second-derivative spectrum analysis using Linkfit 4.1 computational program as well, equilibrium constants between different species of complex particles have been estimated.

We have studied the volumetric properties of surfactant–demethylsulfoxide–water system by densitometric method. It is shown that the apparent molar volumes of system decrease by increasing dimethylsulfoxide and surfactant concentrations and increase by increasing temperature. The changes of standard partial molar volume of system are depending on type and concentration of surfactant and temperature. The obtained results are explained in terms of intermolecular interactions between components of system.

Kinetics of accumulation of intermediate compound (IC) in gas phase being formed at interaction of H₂O₂ vapors with MgO at 273 K and 7.5 Pa pressure of peroxide has been studied for the first time. Values of IC transportation rate from surface into gas phase and constant of its futher heterogeneous decomposition rate has been defined.

Interaction of molybdenum(VI) with tartaric acid at certain concentration of perchloric acid (1 M) is studied using spectrophotometric methods (isomolecular series, shifts of equilibrium, Asmus straight line-and ion-exchange chromato­graphy). It is established that at the indicated interaction there appears a complex 1 : 1 M  ratio. The  contents of the formed complex and the value of the resistance constant are defined.

The genotoxicity of the new porphyrin FeTOEt4PyP was investigated at cell and acellular systems. Experimental cell and acellular systems used were based on Comet-assay. The differences in the sensitivity of two models presented are to reflect the different levels of their organisation. The approach applied may be recommended for the estimation of genotoxic effects of different agents and comparative analysis of role of cellular mechanisms in DNA damage.

Change of heart rhythm variability at examinees with various initial degree of aggression and conflictness is researched at aggressive environment modeling with use of «aggressive» computer games. Authentic decrease of an anxiety level and stress index at teenagers with a high level of aggression and conflictness is revealed, and at teenagers with a low level – authentic changes is not observed. Beneficial effect of «aggressive» computer games on psychoemotional sphere of teenagers is revealed.

In a wide interval of Na-$\beta$-glicerophosphate concentration, as well as at high concentrations of sodium p-nitrophenylphosphate the kinetics and mechanism of phosphatase reaction in leached chernozem has been investigated. It is shown, that the hydrolysis of these substrates, as well as of the earlier studied sodium phenolphthalein obeys the mechanism of substrate inhibition. On the basis of the analysis of kinetics and thermodynamic parameters of the investigated process it is shown, that the differences in these systems have only quantitative character, conditioned by various reactivity, as well as sorption ability of investigated substrates and products of hydrolysis.

For the first time special researches of macroscopic fungi of Republic of Nagorno-Karabach are accomplished. In this work is given the taxonomic analysis of distribution of systematic categories of Agaricoid Basidiomycetes. The nomenclature and systematic belonging of taxon is specified in compliance with the modern classification systems. The list of 67 species agaricoidal fungi is given, which are discovered, in the investigated area.

Process of ZnO chemical transportation with hydrogen peroxide has been studied by ESR method. It has been shown, that beginning from 273 K the process of zinc oxide transportation is observed. At the same time formation of intermediate molecular compound and free hydroperoxide radicals takes place.

Comparative genotoxicity of new porphyrins TOEt4PyP and their Ag-, Zn- and Co derivatives was estimated by Comet-assay in mice leukocytes in vivo, depending on time of treatment. The increase of level of DNA damage after 24 hours in comparison with 6 hours of porphyrins administration confirms their cumulative effect, that can be applied in chemotherapy of tumors.