(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF CHEMICAL SCIENCES
Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus
| Proceedings of the National Academy of Sciences of Belarus (Vestsi Natsiyanalnai Akademii Navuk Belarusi) SERIES OF CHEMICAL SCIENCES Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Summary: Peculiarities of evolution of microstructure of porous composite Àl/Àl2Î3 at thermotreatment on the air at temperatures 600--1200 °C have been investigated. It has been stated that polymorphous transformation, recrystallization of porous cover Àl2Î3 on an aluminium particles, smelting and evaporation of the metal intensify chemical interaction of aluminium with oxygen of an air. A growth of threadlike crystalls of s-Àl2Î3 is conditioned by dominating of vapour-phase mechanism of metal oxidation. Mechanism of baking of active Àl2Î3 is caused by temperature of a process. At 770--930 °C surface mass-transfer turn into volume diffusion and is accompanied by intensive decreasing of as specific surface as limit sorption pores volume.
Aleksandrovich H. M., Dichkevich N. V.
The interaction of particles in the salt dispersion systems. pp. 11--14
Summary: It has been shown that the hydration of salts and solution compositions effected on the interactions of the salt and clay minerals.
Moskalchuk L. N.
Theoretical aspects of amendments development for reclamation of soils contaminated by radionuclides. pp. 15--19
Summary: The analysis of modern tendencies on studying of the behavior of radionuclides in soil solution and existence approaches on the assessment of main quantitative properties of radiocaesium sorption by soil and efficiency of using specific adsorbents for reclamation of soil contaminated by radionuclides are presented in this article.
Summary: The conditions of cobalt determination by method stripping voltammetry are explored. The optimal parameters analysis of cobalt using glassy-carbon electrode are defined.
Egorov V. V., Rakhman'ko E. M., Rat'ko A. A., Pronina I. A. †
Acetylsalicylate-selective electrode based on Sn4+ tetraphenylporphyrin complex and its application in analysis of medicines. pp. 24--28
Summary: The possibility of use of an electrode based on Sn4+ tetraphenylporphyrin complex with lipophilic anionic additive --potassium tetrakis (p-chlorophenyl) borate, having high selectivity to acetylsalicylate-ions, for the determination of the mentioned ions in medicines was investigated. The methods of direct potentiometic determination of acetylsalicylate ions in medicine forms, characterized by expression, simplicity of the determination fulfilling and sufficient precision were worked out.
Summary: We have shown the possibility for the deposition of carbon films on the stainless-steel electrodes under the action of single powerful electric pulses in a dimethylsulfoxide solution of lithium acetylide. The films such obtained exhibit a distinct diamond-like structure including no less than 50% of sp3 hybridized carbon.
Valendo A. Ya., Voronova E. I., Nesterenok P. V.
Investigation of ethylene polymerization kinetics on homogeneons catalyst system Cp2TiCl2--AlEt2Cl modified by diphenylmagnesium. pp. 34--37
Summary: It has been showed that introducing of diphenylmagnesium as modificator in homogeneous catalyst system AlEt2Cl influences considerable on catalyst activity and kinetics of ethylene polymerization. It has been established that nature of catalytic active sites formed in modifyed catalyst system is close to nature of catalytic active sites in homogeneous catalyst Cp2TiCl2--AlEt2Cl. Increase of catalytic activity homogeneous catalyst system in the presence of diphenylmagnesium at the beginning of polymerization is connected with participation of organomagnesium compounds in processes of alkylation with formation of catalytic active alkylated complexes Ti(IV).
Kolnenkov V. P., Motoro S. V.
Analysis of Vilson's equation for calculation of the multidimensional ionexchange equilibrum. pp. 38--44
Soldatov V. S., Kuvaeva Z. I., Pushkarchuk A. L.
Estimation of projections area of dinonylnaphthalenesulfonic anions. pp. 45--50
Summary: The areas of D--anions adsorbed on the surface were calculated from the surface tention isotherms on the border of electrolyte aquens solution and organic solution of dinonylnaphthalenesulfonic acid (HD) or its salt (ID). The scale models of HD molecules were constructed by the computer simulation method and the minimum and maximum projections areas were determined. As a result, the areas of different D--anion projections are equal to the values from 100 °A 2 to 177 °A 2. Area taken from interface tension results makes 161 °A 2.
Yakytik I. M., Shevchenko G. P., Branitsky G. A.
Kinetic investigation of the processes of the filamentary-fibrous silver structures growth on the nickel and zinc in aquious solutions of AgNO3. pp. 51--56.
Summary: pH dependence of the kinetic of the process of the contact reduction of silver ions with nickel and zinc in aqueous solutions of AgNO3 was studied. The rate of the contact reduction depends on the concurent side processes of metal's ions hydrolysis and water reduction.
Tolochko N. K., Yadroitsev I. A., Myaldun A. Z., Sobolenko N. V., Mozzharov S. E.
Nucleation kinetics of camphor in ethanol solutions. Crystallization by salting out. pp. 57--61
Summary: The kinetics of camphor solution crystallization by salt-out technique has been investigated. The nucleation induction period and precipitation start time as functions of the processing conditions have been determined. The time-dependences of nuclei number formed have been studied. It was shown that creation of solution supersaturation during salting-out has some peculiarities influencing the nucleation kinetics.
Summary: A short review on organic desinfectant has been made. Organic structures mostly used for struggle against pathogen and mushrooms were selected. Special alteration for new polymer alkylenguanidin antiseptic Possibility organic structures chemical modification were devoted.
Yuvchenko A. P., Dikusar E. A., Olkhovik V. K., Matveenko Yu. V.
Peroxide containing dioles based on substituted biphenyls. pp. 68--72
Summary: The acetylenic biphenyldihydroxyperoxydes and biphenyldioles have been obtained by the interaction of lithium peroxy acetylides and butyllithium with 4,4'-diformylbiphenyl and dimethylesther of 4,4'-biphenyldicarboxylic acid.
Kovganko V. N., Stanishevsky L. S.
Azometins in the synthesis of 7-nitro-6-phenylpevhidro-4-indanones. pp. 73--75
Summary: A convenient approach to 7-nitro-6-phenylperhydro-4-indanones has been firstly developed. This method involved acid catalysed condensation of 2-(nitrometyl)-acetylcyclopentane with benzylidene-phenylamine to corresponding unsaturated g-nitroketone and following intramolecular cyclization of later compounds to target indanones.
Bezborodov V. S., Kovganko N. N., Lapanik V. I.
Synthesis of new derivatives of 4-(5-alkyl-2-isoxazolin-3-yl)phenol that possess liquid crystal properties. pp. 76--79
Summary: The synthetic approach to a new derivatives of 4-(5-alkyl-2-isoxazolin-3-yl)phenol that possess liquid crystalline properties is described. This method involved 1,3-dipolar cycloaddition of nitrile oxide V to heptene-1-ene following by deben-zylation to corresponding phenol VII. Further esterification with various acids gives desired compounds IXa-d with three or four cycles, one of which is 2-isoxazoline ring. The mesomorphic properties of these compounds are given.
Summary: A method has been developed for preparing high purity human thyroperoxidase for the use in an immunoassay technology. The thyroperoxidase isolation procedure includes obtaining the microsomal fraction of the thyroid, its solubilisation with detergents, the fractionation of the solubilised material with ammonium sulphate followed by dissolving the thyroperoxidase-containing residue in 6 M urea at pH 12 and the purification of the target product using ion-exchange and gel-exclusive chromatographies. The thyroperoxidase preparations are characterized by electrophoretic and spectrophotometric methods, enzymatic activity and immunoreactivity are determined. The usefulness of the thyroperoxidase for the application in an immunoassay technology has been shown.
Andrianov A. M., Sokolov Yu. A.
Immunoreactive conformation of the HIV-MN immunodominant epitope. pp. 88--94
Summary: The geometry refinement for the four preferred structures of immunodominant epitope of HIV-MN protein gp!20, derived earlier from the NMR spectroscopy data, is carried out using the quantum chemistry methods. As a result, the energy characteristics of initial structures were improved significantly, and their relative locations on the scale of formation heats were determined. On this basis, only one out of four starting structures is proposed as the biologically relevant conformation for the virus immunogenic crown. It is shown that the geometric parameters of this structure in water solution match a double b-turn conformation. The results obtained are discussed in connection with the literature data on the structure of the HIV--1 principal neutralizing determinant.
Summary: The sorption-desorption properties of the Dnieper river silts and silt deposits in their response to Cs-137 and Sr-90.
Summary: Process of stabilization of a cubic phase oxide zirconium is investigated by introduction of stabilizing additives of cerium and yttrium by a method of chemical sedimentation of stabilizing additive on charge ceramics. It is received, that achievement of a required degree of stabilization needs smaller quantity (amount) of additives in comparison with a traditional way. The mechanism of the stabilization, consisting that the method of chemical sedimentation reaches (achieves) uniform distribution of the additive on particles initial charge monocline oxide zirconium is offered.
Solovyova T. V., Alekseev A. D., Kuzyomkin D. V., Kats L. I.
Study of interplay of fur-tree lignine of mechanical grind with carbamide by a method of gel chromatography. pp. 107--110
Summary: The interplay of fur-tree lignine of mechanical grind with carbamide by a method of gel chromatography is studied.
Levitski I. A., Gailevich S. A.
Influence of divalent cations on the process of phase separation in borosilicate glasses. pp. 111--116
Summary: Influence of Mg2+, Ca2+, Sr2+, Ba2+ and Zn2+ cations on the process of phase separation of borosilicate glasses has been investigated. It is established, that the impact of the investigated cations on the coordinating transmission [ÂÎ3] « [BO4] is ambiguously and does not confirm to the known rule of ionic radius. Investigated glasses are noted for liquating structure of the drop type. The subject matter of the investigation was receipt of transparent and pacified glazes.
Karpunin I. I.
The kinetic and mechanism of the alkali cooking of wood in the presence of the salts of variable valency. pp. 117--120
Summary: The paper deals with study on influence of an additive some transition metals on polymerization model compound of lignin. On the basis of obtained data was revealed influence of quantity abovementioned compounds on polymerization isoeugenol (model compound of lignin) in the time of alkaline cooking.
Pishch I. V., Kirdyashkina N. A.
Opportunity of the receipt of chemically durable materials on the base of refractory clays and granite screening. pp. 121--123
Summary: Results of the investigation of metediabaze influence on physical-chemical properties of synthesized samples are presented. Temperature-time parameters and criteria for production of chemical durable materials have been established.
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