(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: The thermostability of some glasses belonging to silicate and phosphate systems at long-time annealing of them close to their softening temperatures in dependence on their composition was investigated. The regions of glass compositions that are suitable as glassy matrixes for creating such nonlinear-optical materials as glass-nanocrystalline semiconductor were determined.
Kuznetsova T. F., Eremenko S. I., Lemeshonok G. S.
Sorption of tetrachloromethane vapour by porous silicatin-phosphate. pp. 10--13
Summary: Variation of the Si/Sn molar ratio from 0.9:0.1 to 0.1:0.9 enabled the tetrachloromethane vapour adsorption-desorption perfomance of porous silica-tin-phosphates prepared by the coprecipitation of active silicic acid and tin tetrachloride to be examined. A variety of isotherms typical for microporous and mesoporous adsorbents was obtained by this preparative route. The Si/Sn molar ratio changing microporous texture into mesoporous one was fixed.
Summary: The high effective method of preparation of ashless active microporous carbon sorbents on the basis of organic sapropels has been elaborated. The sorption-structural characteristics of the obtained carbons have been studied. It has been shown that sorption capacity of active carbons rises from 0.062 up to 0.758 sm3/g, and specific surface rises from 90 up to 1000 m2/g depending on the methods of sapropel activation. The mechanism of sapropels activation has been considered and the scientific interpretation of proceeding processes has been given.
Komarov V. S., Polyakov N. S., Repina N. S., Rat'ko A. I., Voloschuk A. M.
Adsorbents prepared by acid activation of organic sapropels. pp. 19--22
Summary: Structural parameters of oxide and hydroxide samples obtained from filtrate of acid activation of sapropel raw carbon have been studied. It has been shown that acid filtrate, the waste of active ashless carbons preparation on the basis of organic sapropels, including aluminum, iron and magnesium salts and microelements can be used for obtaining of active mineral sorbents.
Summary: The influence of nature and concentration of lipophilic ionic additives, nature of plasticizer and concentration of background electrolyte on pH response is examined in detail. It is showed, that metalloporphyrins functioning via neutral carriers mechanism seem to be more preferable among all studied, because the optimization of membrane composition in this case is achieved by incorporating the lipophilic cationic additive, which suppresses the pH response in acid region. Membranes functioning via charged carriers mechanism (high selectivity is observed when anionic additive is incorporated into the membrane) exhibit strong pH response in wide pH region, that is why it is possible to carry out direct potentiometric measurements using such type of electrodes only in hardly buffered solutions.
Zhebentyaev A. I., Yarantseva N. D.
Fluorimetric determination of triphthazine by means of the reaction with floxin A. pp. 29--32
Summary: Conditions of the triphthazine fluorimetric determination based on the reaction with floxin A were optimized. Chemical - analytical properties of the associates formed were studied. Procedure for extractive-fluorimetric determination of triphthazine in tablets was worked out.
Gulevich A. L., Rakhman'ko E. M., Kiyko T. N.
Properties of trihalideacetate-selective electrodes on the basis of hexylic ester of p-trifluoroacetylbenzoic acid. pp. 33--36
Summary: The film trihalideacetate-selective electrodes with using hexyl-(p-trifluoroacetyl)benzoate as a solvation addition have been elaborated. Such analytical characteristics of these electrodes as limits of sensibility, linearity and slopes of graduating curves and potentiometric selectivity have been studied. It has been established that modified membranes are more selective to trihalideacetate-anions in the presence of hydrophobic anions in comparison with non-modified membrane.
Summary: Kinetics of hydroxocomplex formation in nitric solutions contained Cr3+-- Cu2+, Cr3+ -- Zn2+ -- ions has been studied, and activation energies of this process have been calculated. It was shown, that the hydroxocomplexes are nonstable. The dominating influence of Cr3+-ions opon the process of the joint hydrolysis has been substantiated.
Gromak V. V., Avakyan V. G., Pashkovskii F. S.
Ab initio MO study of tautomeric properties of 3-formyltetronic acid. pp. 41--45
Summary: An ab initio (MP2/6-31G(d) level of theory) calculations have been carried out to obtain the order of stability of all the possible enolic forms of 3-formyltetronic acid (FTA) and evaluate the hydrogen-bond strength. The harmonic vibrational frequencies of equilibrium structures of cis-enolic forms of FTA have been determined.
Lishtvan I. I., Brovka G. P., Davidovskii P. N., Dedyulya I. V., Brovka A. G.
Moisture influence on sorption and migration of Cs-137 and Sr-90 in peat soils in the presence of electrolytes in pore solution. pp. 46--51
Summary: The results of laboratory and field experiments on regularities of the vertical migration of Cs-137 and Sr-90 in peat soils at different moisture regimes and in the presence of electrolytes in pore moisture are represented.
Soldatov V. S., Kuvaeva Z. I., Bychkova V. A., Vodop'yanova L. A., Karankevich E. G.
Regularities of extraction of glutamic acid and valine by liquid sulfocationite. pp. 52--56
Summary: Regularities of extraction of glutamic acid (Glu) and valine (Val) by 0.1 M solution of dinonyl naphtalene sulfonic acid in n-heptane have been compared. It has been shown that extraction of Val is substantially higher than that of Glu, which evidences importance of the hydrophobic interaction effect in the extraction. In the both cases extraction values have a maximum when the amino acid molecules are present both in cationic and zwitterionic forms. The significant parts of the both amino acids are extracted in the form of bipolar ions. Extraction of the both amino acids causes rearrangement of micelles of the liquid ion exchanger.
Moskalev G. I., Muranova E. N., Bashmetov A. V.
Optimization of the Randic's index for research of physical properties of alkanes. pp. 57--61
Summary: In work because of researches of physical properties of alkanes the method of designing new indexes that of a type as index of Randic is considered. The functional dependence of boiling temperature of alkanes on the optimized index of Randic is obtained.
Summary: Bi- and tetranuclear tetrazolyl derivatives of diphenyl ether and their complexes with copper chloride (II) have been synthesized. Quantum-chemical and IR spectral investigations of the obtained compounds were performed and their possible structures were proposed.
Lopatik D. V., Bondareva O. M., Kuvaeva Z. I.
Method of L-Lysine hydrochloride racemization. pp. 68--69
Summary: The racemization of L-Lysine hydrochloride was carried by heating in a medium of acetic acid in the presence of aromatique aidehyde and sodium acetate.
Summary: We have carried out new radioimmuno -- and ELISA assays for the measurement of Immunoglobulin Free Light Chains -- important clinic markers of disturbed immune system function and some malignant and limphoproliferative diseases. These methods have been tested in the patients with different forms of pathology for the analysis of its clinic and diagnostic significance.
Litvyak V. V.
Influence of 2'-5' oligoadenilates on amilolithic hydrolysis of starch of couching wheat. pp. 77--80
Summary: 2'-5'Oligoadenilates slows down the starch ammolithic hydrolysis of couching wheat "Nadjeja". The increase of glucose maintenance and accumulation of starch were observed. The oligonucleotides in the concentration 10-7 M increases the b-amylase activity and decreases the a-amylase one developing the strong effect similar to that of abscisic acid. The same in the concentration 10-10 M results in the small opposite effect promoting weak gibberellinlike activity.
Grintsevich E. E., Metelitsa D. I.
Inhibition of peroxidase oxidation of iodide by poly (tri-disulfide-4,4'-dioxydiphenyl sulfone). pp. 81--86
Summary: Inhibition kinetics of ion I- oxidation by hydrogen peroxide catalyzed by horseradish peroxidase in the presence of poly(3-disulfide-4,4'-dihydroxydiphenylsulfone) (poly(DSHPS)) has been studied at 25°C in 0.05 M acetate buffer, pH 5.2, containing 2% DMFA. An inhibition of mixed type is characterized by the inhibition constant Ki Equaled to 4.0 µM at 25°C. Poly(DSHPS) and ion I interact with different sites of peroxidase and complete for its active intermediate Compound I. Peroxidase-catalyzed iodide oxidation occurs by two-electron mechanism but the radical stages of a process can not be fully excluded.
Summary: It has been stated that while treating peat humic acids (HA) in a moist state with the flow of electrons one can observe along with an absorbed dose an increase of averaged molecular masses, high-molecular fractions share, decrease of low-molecular constituent share and insignificant reduction of samples poly-dispersion ability, thus testifying to the polymerization processes run. By the ESR-spectroscopy method it has been shown that peat HA radiation modification is accompanied by the formation of new structures of polyconjugation.
Elinson I. S., Omel'chenko T. N., Tsygankov V. I., Martinovich V. I., Soldatov V. S.
Anion exchangers on the basis of chlorinecontaining synthetic fibers. pp. 92--96
Summary: The interaction of polychlorovinylic fibers of different types with organic polyamines (diethylenetriamine, ethylenediamine, polyethylenepolyamine) has been studied at the temperature 20--95°C in the absence and presence of solvents (water, ethyl alcohol, dioxan). It has been shown that choosing interaction conditions enables the products ratio of amination and dehydrochiorination reactions on polymeric fibers to be regulated in order to prepare anion exchangers which unite high exchange capacity (up to 4.0 mmol/g) and possible processing into unwoven filter material. Expedience of the two-step synthesis (preliminary treatment of polyvinylchloride by polyamine at 20--30°C followed by amination at 60-95 °C) has been shown.
Summary: As a result of field researches of the Sozh-river valley the laws and features in distribution of Cs-137 are revealed depending on features of primary loss of the radioisotope and its dispersion, and also geological and tectonic pattern of the valley. On the basis of the saved material the ecological -- radiogeochemical division into districts is offered.
Veremchuk S. N., Kuznetsov V. A., Generalova V. A.
Colloids, microelements and radioisotopes in valley sediments of the Sozh-river. pp. 102--106
Summary: Contents of colloidal hydroxides of Fe, Mn, Al, Si and Ti and their relation with some microelements and radioisotopes are examined.
Summary: It has been shown that air oxidation of viscous bitumen is essentially increased by additives which extremally decrease its viscosity such as the extract of selective cleaning of fourth oil distillate and dark product of vacuum distillation of black mineral oil. The maximal acceleration is observed at 2.5--4.0 w.% of the former and 1.0--2.5 w.% of the latter in heavy bitumen.
Andreeva R. A., Moiseenko L. P., Shestopalova O. E., Abaev G. N.
Kinetics of anaerobic fermentation of waste of oilprocessing and oilchemical industry. pp. 110--113
Summary: The methods and results of study of regularities of anaerobic digestion as a complex treatment method stage for organic waste of oil-refining and oil-chemistry sewage disposal plants have been shown. An anaerobic digestion kinetics model has been developed which allows the increase and retardation factors of the organic matter treatment for certain organic waste type to be taken into account.
Rudakova O. A., Zhukov V. K., Parmon S. V.
Influence of technological parameters on process of reed wax extraction. pp. 114--116
Summary: The influence of extraction time and reed moisture on the extract output was shown.
Brazhnikov M. M., Brazhnikova L. Yu., Grinyuk E. V., Novikov O. A., Krul' L. P.
Regulation of dynamic viscosity of water-salt solutions of products of alkaline hydrolysis of polyacrylonitrilic fiber waste. pp. 117--119
Summary: It has been determined that the equation from theory of mixing of liquids which are soluble in one another for mixing solutions of watersoluble polymer with different viscousities or for its mixing with water may be used.
Kulevskaya I. V., Verbitskii V. V., Agabekov V. E.
Preparation of optical transparent sensitive to pressure glue for polarizers. pp. 120--122
Summary: Optical transparent pressure-sensitive glue for use in jointing of polarizer to glass surface of liquid crystal indicator comprised butylacrylic and vinyl acetate copolymer, alkylphenol-formaldehyde resin and terpenic compounds has been obtained and investigated.
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