(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 effect of water-soluble polymers on the stability and dispersity of carbon active tablets suspensions has been studied It was established that such polymeric binders as poly(vinyl alcohol), carboxymethyl cellulose, methyl cellulose do not increase carbon active suspension stability. At the same time carbon tablets suspensions containing new water-soluble cellulose derivative have heightened aggregative and sedimentation stability. This accounts for by the appearance of hydrophilic properties of the carbon particles surface. This hydrophilization is the result of cellulose derivative absorption on this surface. The particles of initial carbon and traditional tablets do not possess hydrophilic properties.
Komarov V. S., Repina N. S., Rat'ko A. I.
Adsorptionstructure properties of bipole and tripore adsorbents. pp. 10--13
Summary: Sorption-structure charactrristics of synthesized bipore and tripore adsorbents have been studied. It has been shown that sorption potential and pore structure of the adsorbents obtained can be changed in the wide limits by changing the composition of mixtures consisted from hydroxide of different structure. Scientific interpretation of the experimental results has been given. It has been noted the features of bipore adsorbents formation are right for hydroxides of various nature independently on the shape of their particles.
Summary: The anion-exchange extraction of sulfate- and hydrosulfate- ions was investigated in the TNODA+ DNF-/Az- extraction systems, where TNODA+ DNF- is trinonyloctadecylammonium 2,4-dinitrophenolate. Az- is the anion to be extracted. The influence of solvation addition, 1-(trifluoroacetyl)-3,5-dinitro-4-chlorobenzene, on extraction of these anions was studied. Constants of extraction, solvation numbers for SO42- and HSO4- were calculated.
Summary: Sorption of berberine on unmodified (silochrom S -- 120 etc.) and chemically modified with octyl and hexadecyl groups silica gels as well as cellulose sorbents (cellulose, carboxymethylcellulose) is studied. A procedure for berberine spectrophotometric quantitative determination in urine after its previous sorption isolation is worked out.
El'shin A. I., Vegera A. I.
Modeling of nonstationary phase of tap water ultrafiltration. pp. 23--29
Summary: The work is devoted to analysis of the tap water ultrafiltration with nonstionary initial phase of filtration. For the nonstationary initial period explanation a model of ultrafiltration process based on the tortuosity scale approach was developed. Model data are correlated well with those experimental data for the dead-end and cross-flow ultrafiltration. The modeling results show that the ultrafiltration flux can be increased by means of initial ultrafiltration period minimization throught (a) total solid water concentration reduction, for instance, with pre-filtration help; (b) average particle size increasing in water, for example by coagulation or floculation.
Valendo A. Ya., Nesterenok P. V., Voronova E. I.
Kinetics of Ti(III) complex formation in the catalytic system CpTiCl2 -- AlEt2Cl -- MgPh2. pp. 30--33
Summary: It has been showed that introduction of diphenylmagnesium in catalytic system Cp2TiCl2 -- AlEt2Cl leads to considerable changing of Cp2TiCl2 reduction kinetics and character of Ti(III) complexes formed. This fact has been connected with participation of organomagnesium compounds in alkylation processes proceeding in the system.
Paulechka E. V., Blokhin A. V., Kabo G. J.
Enthalpy of hole formation in liquid methyl m-toluate. pp. 34--38
Summary: The density of liquid methyl m-toluate in the range from 293 to 362 K. was measured by the picnometric method. The values of hole formation enthalpy in liquid methyl m-toluate were determined from the temperature dependence of volume of the liquid and calorimetric data.
Martinovich V. I., Elinson I. S., Soldatov V. S.
Preparation and properties of acrylic polyelectrolytes and compositions based on them. pp. 39--43
Summary: Watersoluble polyelectrolites with carboxylate and acrylamide links have been obtained by basic hydrolysis of acrylonitryle copolymers. Compositions of this polyelectrolites with quaternary ammonium salts possess fungicide properties.
Starobinets G. L., Bychkovskii P. M., Simnitskii D. S., Yurkshtovich T. L., Kaputskii F. N.
Molecular sorption of prodimin by monocarboxylcellulose from binary solutions water -- organic nonelectrolyte. pp. 44--49
Summary: Sorption of an anticancer drug prodimin with a carboxylic cation exchanger in H+ form -- monocarboxylcellulose [MCC(H+)] from five binary solutions of water-organical nonelectrolytes (NE) over all range of molecular fraction (N2) of the NE has been studied at 293۫ K. Unlike of other anticancer drugs the isotherms lgKd - N2 (Kd is the distribution coefficient of prodimin) are passing to a maximum at N2 » 0.5 in all binary systems. The nature of this phenomenon has been considered with account of microscopically demixture of the binary systems. An opinion is expressed that on the basis of prodimin and MCC(H+) a macromolecular therapeutic system may be created.
Chekhovskii A. K., Yurkshtovich N. K., Kosterova R. I., Kaputskii F. N., Golub N. V.
About the mechanism of complex formation of monocarboxylcellulose with zinc ions in water solutions. pp. 50--55
Summary: The isotherms of Zn (II) sorption of from acetate, chloride and sulfate solutions by monocarboxylcellulose are obtained. The adsorption mechanism and structure of the coordination compounds are discussed. The constants of stability of these complexes are determined. The influence of the amount of Zn ions absorbed of on physical-mechanical properties of oxidized cellulose filaments are inverstigated.
Summary: 3,7,7-trimethyl-4-acetoxymethyl-1,3,5-cycloheptatriene has been established to be the main product of 4-aceto-xymethyl-3-carene and per-acids interaction. The reaction scheme including epoxyde formation, its isomerization into allyl alcohol followed by dehydration and tautomeric change has been proposed.
Summary: Theoretical study of the central crest of the HIV-1 principal neutralizing determinant, N-terminal tetrapeptide of the virus immunodominant epitope, is carded out. To this end, the NMR-based theoretical conformational analysis of this stretch is performed for four different virus isolates (HIVMN HIVRF, HIVThailand and HIVHaiti). The following major conclusion is made by the comparison of the simulated tetrapeptide structures with the X-ray data for homologous protein fragments: this biologically important site of the HIV-1 protein gpl20 forms a mixture of two conformers which have the geometric parameters characterictic for conformations of b-bend and inverse g-turn.
Poopeiko N. E., Tsvetkova T. M.
The development of approaches to synthesis of fluorothiosugars. pp. 65--69
Summary: The opening of epoxy-cycle in methyl 5-0-trityl-2,2-epoxy-a,b-D-lyxofuranosides 1a,b has been studied. The course of opening on the configuration of methoxy-group. In the case of b -anomer 1b desired thiocyanates 4 and 2b obtained with moderate yield. Contrary above, starting from epoxide 1a disulfide 6 was isolated as sole product. Using potassium thiocyanate instead ammonium led to the isolation unstable 2a with very low yield. The subsequent treatment of 2b by diethylaminosulfotrifluoride in benzene afforded fluoro-derivative 5. In analogius conditions from 6 disulfide 7 having 2-double bond was formed. The structures of the compounds synthesized were confirmed by IR-, 1H- 13C-NMR-spectroscopy data and by elemental analysis.
Litviak V. V.
Influense of adenylyl (2-5) adenylyl (2'-5') -9- (2', 3'-anhydro-b-D-ribofuranosyl) adenosine-2(Na+) salt on biochemical processes of growing wheat. pp. 70--74
Summary: Adenilil(2'-5')adenilil(2'-5')-9-(2',3'-anhydrous-b-D-ribofuranosine)adenosine-2(Na+)salt (10-7 M) shows the strong effect of abscisic acid causing the increase of b-amylase and decrease of a-amylase activity and in concentration l0-10 M promotes strong gibberellinlike activity and results in the insignificant increase of a-amylase and decrease of b-amylase activity of growing wheat "Nadjeja". So activating the ketose exchange, aldolase reaction and exchange of inorganic phosphorus the auxesis has shown the effect similar to the cytokinin action.
Rus O. B., Metelitsa D. I.
High-effective test-system for the total antioxidant activity detection of human blood serum. pp. 75--82
Summary: The optimization of the test-system "H2O-methemalbumin(MetHa)-ortho-phenylenediamine(PDA)-sodium(2,3-dihydroxy-4,6-di-tert.butyl-phenyl)-S-thiosulfate (InH1)" for total antioxidant activity (TAA) detection of human blood serum (HBS) has been carried out. The calibrate dependencies are the straight lines in l/v0 -- [InH1]0 and l/v0 -- [HBS]0 coordinates, where v0 is the initial rate of inhibited oxidation of PDA by hydrogen peroxide. The human blood serum concentration (HBS, mg/ml), equivalent to 1 µg/ml of the antioxidant InH1 in inhibition activity on peroxide oxidation of PDA was used as the quantitative characteristic of TAA. The TAA indexes of blood sera of 5 groups of patients with different pathologies, differing for various groups and patients in each of them were determined at 37 °C in buffered physiological solution, pH 7.4, containing 2% of DMSO. The low antioxidant status of HBS was shown for the infaret patients, cardiopatients after reanimation and patients with gastropathology.
Summary: It has been found out that while treating peat humic acids (HA) in humid conditions with fast electrons flow (W = 80 and 90%) a reduction of the content of carboxylic and phenol hydroxylic groups and decrease of the content of free carboxylic groups occurs. Tendency towards increasing of total carboxylic groups content is noted.
Summary: New radiomonitoring data of the Sozh-river flood-plain are characterized.
Onoshko M. P.
Sorption and desorption of Sr-90 and Cs-137 by sediments of the Sozh-river valley and border water collections. pp. 92--96
Summary: The correlation of sorption-desorption data of watershed rocks (moraine, clay, loam, sandy loam) as well as the Sozh-river sediments (meadow marl, peat, barried soil) in relation to Cs-137 and Sr-90 are studied.
Summary: The physicochemical and reological properties have been studied of heavy bitumen and its mixtures with such additives as extract of selective cleaning of fourth oil distillate and dark product of vacuum distillation of fuel oil. It has been shown that the additives significantly decrease viscosity of bitumen allowing to intensify its oxidation by air oxyden.
Chernaya N. V., Emello G. G., Lamotkin A. I., Zholnerovich N. V.
Electolytic coagulation of glue colophony emulsions. pp. 101--103
Summary: The kinetics of the process of electrolytic coagulation depend on the degree of adsorption saturation and charge of the glue emulsion particles.
Bondarenko Zh. V., Gorskii G. M., Shlyk E. G.
Paper filtering material from plant fibers. pp. 104--106
Summary: The filtering material for flow medium clearing was made from cotton pulp, deciduous and coniferous cellulose, using poliamide-poliamine-epichlorohydrine resin at the quantity of 1.0% from the absolutely dry fibreas a liquid resistant agent.
Lishtvan I. I., Kraiko V. M., Gapanovich E. V.
Influence of electrochemical treatment on organic component composition of animal breeding drains. pp. 107--110
Summary: It has been stated that application of bimetal soluble electrodes in an electrolysis installation allows to enhance water purification rate of animal breeding complexes both due to optimization of oxidation-restoration processes at the electrodes and to additional sorption of organic nature pollutants on hydroxides of the metals.
Karpunin I. I.
Influence of transitional metals salts on alkaline digestion of plant materials and alkali regeneration. pp. 111--116
Summary: The schemes have been described for introduction of transitional metal salt (CuSO4 • 5H2O) and regeneration of the salt added at alkali digestion of plant materials.
Kuz'menkov M. I., Bogdanovich I. A.
Preparation of calcium sulphate dihydrate for the praduction of supergypsum. pp. 117--122
Summary: Calcium sulphate dihydrate was synthesized to use as a raw material for supergypsum production. The process of synthesis was worked out, the following technological parameters were taken into consideration: order of merging reagents, their concentrations, speed of mixing, temperature of synthesis, role of admixtures. The influence of the enumerated parameters on the size of the obtained crystals of CaSO4•H2O and on properties of the binding based on it was investigated.
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