Vol. 35 No. 2 (195) (2001)

The physicochemical properties of polyacrylonitriles, synthesised in the presence of the nitrates of aluminium and copper with the use of spectral methods (IR, UV, NMR), element analysis and X-ray photography have been investigated. It was shown that these polymers are more amorphous and more isotactic than the polymers prepared by the radical mechanisms.

Due to the maintenanse of reactionable functional groups and the existence of three-dimensional structure the polymer possesses a high ability of water absorption. The modified samples are studied by IR spectroscopy.

It has been shown that interaction of 2-oxo-3-alkyl-6-methyl-6-chloric-l,4-dioxanes with etylendiamine or hexamethylenediamine gives 1,2-N, N' -ethanebic-, 1,6-V, N - hexane-2-oxo-3-alkyl-6-methyl-6-amino-1,4-dioxanes. The interaction of chloricdioxanes with substituted pyrrolinone gives N-(2-oxo-3-alkyl-6-methyl-l,4-dioxan)il-3-alkyl-4-methyl-5-phenyl-Δ³-pyrolin-2-ones. The influence of alkyl substitutes on the reaction rate is considered.

An efficient method of asymmetric stoichiometric synthesis of s-t-butyl-D-cysteine via addition of t-(CH₃)CSH to the double C=C bond of dehydroalanine in its chiral Ni²⁺ complex of Schiffs base with the chiral auxiliary D-2-N-(N’-benzylprolyl)aminobenzophenone was elaborated. The optical active amino acid s-t-butyl-D-cysteine with high optical purity (e.e. > 98%) was separated after decomposition of the reaction mixture by HCl. The stereoselectivity of nucleophilic addition amounts 92%.

The interaction of molybdochromic heteropolyacid with Crystal Violet basic dye has been studied. The optimal conditions for formation of molybdochromic hetcropolyacid and its compound with Crystal Violet have been estimated: acidity of medium, concentration of molybdate-ion, concentration of dye, the range of chromium contents submitted to the Beer’s law. The composition of complex ionic associate has been determined. Photometric method of nanogramic amounts of chromium has been worked out.

This work is devoted to examination of anticancer preparations by methods of chemiluminescence. It shows that all the preparations have the ability to suppress the process of chemiluminescence, that means they suppress the reaction of free- radical oxidation of lipids of brain homogenat. During the incubation period the change of the level of chemiluminescence is observed, which is different for some preparations. It is found that the incubation period also influences the suppressing ability of these preparations.

The cereals distinguished on ploidy and genome formulae have been studied. Since investigated sorts have common part (AABB), the high level of homology was observed (56% and higher). The lowest level of homology obtained for tetraploid polba. It is assumed that the sources of AABB genome of polba as well as modem hexaploid wheat are common. These data are in good consideration with our recent investigations of the same cereals.

As a result of complementation of dominant genes of hybrid dwarfness the depression of morphological, as well as anatomical parameters of a stalk arises. The type of hybrid Dwarf II is more depressed, which is expressed in sharp suppression of the growth of plants, reduction of the number and size of fibro-vascular bundles. It was found out that the reduction of the diameter of a stalk of a hybrid Dwarf II occurs at the expence of reduction of a hollow part, in this case the functioning surface does not decrease. The type of the hybrid dwarfness as Dwarf III varies to the part of reduction of a diameter of a stalk. The weak development of a mechanical ring is partially compensated by a large number of fibro-vascular bundles located in it. The parenchyma in both hybrids is well developed.

The results of the carried out experiments show, that the most of micromycetes has a selektive influence on inhabiting, overgrowing and biodestruction or biodegradation of the investigated sinthetic materials.

Under the influence of industrial-communal sewage of Armenian atomic nuclear power-station on the air-dry seeds of Allium sera an increase of chromosomal aberrations and genome mutations is observed. After cleaning the water the frequency of chromosomal aberrations abruptly decreases. However the level of genome mutations is preserved.

By interaction of sodium derivatives of N-phenylantranylic acid with ethyl ester of monochloracetic acid, epychlorhydrine, ethylenchlorhydrine and 1,4- di(chlormethyl) benzol the new derivatives of N-phenylantranylic acid have been synthesized.

It is revealed that during the operator's monotonous work cerebral hemispheres take part in the stages of information processing in certain order: the right hemisphere realizes receiving and processing stages and the left hemisphere – late cognitive processes.