Vol. 48 No. 3 (235) (2014)

The possibility to obtain a complex compound of the rhenium(V) with allylthiourea has been studied. The optimal conditions, in which the chemical reaction took place, have been estimated. It has been shown than this reaction may be used for spectrophotometric determination of rhenium(VII). It has been approved by means of potentiometric titration method that 1 mol quantity of tin(II) chloride is necessary to reduce 1 mol quantity of perrhenate, which witnesses about the reducing of the Re(VII) to Re(V). Allylthiourea and Re(V) form a new yellow colored complex substance having maximal light absorption at λ = 365 nm wavelength.

Interaction of 2-methyl-4-chloro-6(8)-methoxyquinolines with various S-nucleofiles, as well as 2-methyl-4-mercapto-8-methoxyquinoline with benzyl chlorides were synthesized substituted bis[4-(quinolin-4-yl)phenyl]sulfides, 4,4′-bis(quinolin-4-ylsulfanylmethyl)biphenyls, 4,4′-[oxybis(benzene-4,1-diylsulfanediyl)] bis(2-methylquinolines), 1,4-bis(quinolin-4-ylsulfanyl)benzenes and 4-(1,3-benzothiazol-2-ylsulfanyl)quinolines.

A detailed description of the preparation of cellulose whiskers monolayer on the silicon wafer surface by Langmuir–Blodgett technique is presented. The Langmuir–Blodgett transfer is realized both by continued compression and sinusoidal compression-expansion conditions of dioctadecyldimethyl ammonium bromide–cellulsoe nanocristals bilayer. The AFM analyze of the cellulose nanocrystals monolayer has shown, that the cellulose whiskers monolayer is more compacted, when the transfer is realized in sinusoidal compression-expansion condition.

We have investigated wine materials, made of Rkatsiteli, Kangun and Meghrabuyr grape cultivars grown at vinyards of Ararat lowland infected with oidium and mildew diseases. Organoleptic assessment and bacteriological investigation of samples have been carried out. According to the obtained results, it is necessary to control the recycled raw material quality and avoid the presence of infected grapes as far as possible. The infected grapes lose their technological value, they are distinguished with their low quality and are worthless for brandy production. The

In present work the effect of electromagnetic irradiation with extremely high frequencies (EMI EHF) on plasma surface tension coefficient values of rat blood has been investigated. The irradiation was carried out by two modes: the plasma of rat blood as well as the rats were exposed to the influence of EMI EHF. The obtained results show that EMI EHF effects on studying parameter resulting in plasma surface tension coefficient value increases. At the irradiation of animals the cumulative effect was observed and at plasma irradiation of rat blood the longer is irradiation duration the stronger changes of surface tension coefficient value take place.

The changes of students’ heart rate parameters during daily academic load, as well as the possibility of their correction with classical music were investigated. It was established that daily academic load leads to disturbance of the sympathetic- parasympathetic balance through an increased activity of parasympathetic mechanisms and development of fatigue. Classical music neutralizes negative effect of daily academic load on the students’ organism functional systems, improves physical and mental efficiency of work, promotes the activation of compensatory-adaptive mechanisms, giving the so-called Mozart effect.

The influence of novel synthetic amino acids and peptides on the growth of bacteria included in test culture collection has been studied. The compounds were revealed to inhibit the growth of all the strains included in collection. Some compounds demonstrated antibacterial activity in relation to antibiotic-resistant E.coli strains, others demonstrated the specificity in relation to particular species. Thus, the novel synthetic inhibitors of bacterial growth, including antibioticresistant ones, were described.

We have employed UV light absorption and circular dichroism methods to study the binding of water-soluble Co(II)-containing meso-tetra-(4N-oxyethylpyridyl) porphyrin (CoTOEPyP4) with B- and A-DNA from Calf Thymus. The binding constant K_b we determined from binding isotherms for each DNA–porphyrin complexes and calculated binding free energy ΔG, enthalpy ΔH and entropy ΔS. Our results suggest that CoTOEPyP4 porphyrin preferably binds via outside self-stacking mode with B- and A-DNA.

It has been previously shown that the virus of acute African swine fever (ASF) infection causes significant alterations in the population of white blood cells. Thus, it has been assumed that ASF disrupts hematopoietic homeostasis through an unknown mechanism. To test this assumption, we have conducted this study to evaluate the changes of red blood cells (RBCs) in peripheral blood during experimental ASF virus infection. Light microscopy of erythropoiesis in this case showed distinct features of dyserythropoiesis. From the beginning of infection, juvenile forms of RBCs, such as the largest cells of erythron, rubriblasts, were observed in the peripheral blood of infected pigs. Among the erythroid precursors, up to 60% of all cells were binucleated, which indicates that acute ASF infection is accompanied with the emergence of pathological forms of RBCs.

The content of Cr, As, Cd, Pb elements was studied in water samples of the Debed, the Gargar, the Shnogh, the Akhtala, the Voghji, the Artsvanik Rivers during 2008–2013 years.

The electrical conductivity of chelate complex of biuret with cadmium was investigated. The degree and dissociation constant of aqueous solution of chelate complex were defined by using the numerical values of equivalent electrical conductance. In accordance with the temperature dependence of lg K from 1/T the heat effect and entropy factor of dissociation of chelate complex were defined.

At the first time the mode of endoinulase purification from dapple has been proposed. Endoinulase was released from Taraxacum officinale root cells, solved in water, settled at pH 6.2, then the sediment was treated by buthanol. The purification was obtained by gel-filtration method applying organic solvents (buthanol and acetone) as well as a column containing G-150 Sephadex (with 2.0×120 cm² sizes). The enzyme was purified 71.3 times, its molecular mass was 176 kDa.