Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2010, No.1
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Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2010, No.1
| Proceedings of the National Academy of Sciences of Belarus
(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF CHEMICAL SCIENCESPublished by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Number 1, 2010
CONTENTS
INORGANIC CHEMISTRY
Klyndyuk A. I., Savitsky A. A.
Thermal expansion and conductivity of Nd1-xSmxBa2-óSróO7-d cuprate solid solutions. pp. 5--11.
Summary:
Zhylinski V. V., Drozdovich V. Â., Ivanova N. P., Zhdanok S. A.
Galvano-plasmic processes in sulfate- and iodidecontaining water media. pp. 12--15.
Summary: Galvano-plasmic (GP) processes in sulfate- and iodide-containing water solutions with electrolyte anodes (St3 steel, VT1-0 titanium alloy, AMg aluminium alloy, Pb-Sn (4%) alloy) and cathodes (C18N9T steel, copper), positioned above the electrolyte surface, have been studied. Using volt-ampere characteristics, zones of stationary electrolysis, intermediate process and stable GP discharge have been determined, depending upon distance between electrodes, their shape and material. A stable GP discharge in 1M Na2S04 for C18N9T steel (cathode) -- VT1-0 titanium (anode) electrode pair occurs, depending upon distance between electrodes, at 80V or higher voltages, while for C18N9T steel (cathode) -- Pb/Pb02 (anode) electrode pair in 0,1M Kl it occurs at 160V or above. The existence of a post-effect showing itself as lasting oxidant activity of treated sulfate solutions, has been established. This effect is caused by synthesis of hydrogen peroxide, ozone and, most probably, metastable radicals.
COLLOIDAL CHEMISTRY
Zhigalova O. L., Opanasenko O. N, Krut'ko N. P.
Colloidal-chemical properties of cationic surfactant mixtures based on di- and polyamines. pp. 16--21.
Summary: Collective behavior of cationic surfactant mixtures based on di- (ODDA) and poly amines (APPA), and quaternary ammonium salts (QAS) at solution/air interface has been studied. It has been shown that for ODDA/QAS mixtures, two kinds of ODDA and QAS micelles coexist in solution in a fairly broad concentration band. These micelles are formed in solution independently of each other, due to surfactant micelle segregation. For APPA/QAS mixtures, synergism of water solution surface tension decrease is caused by QAS association with APPA ions in solution. This should promote emulsification at oil/water interface and improve dispersing properties of two immiscible phases.
Komarov V. S., Kostyuk S. A., Rat'ko A. L, Leonenko L. I.
Effect of drying temperature on porous structure of magnesium and iron hydroxides. pp. 22--26.
Summary: Adsorption-structural properties of iron and magnesium hydroxides, as well as their adsorption capacity change, depending upon conditions of synthesis and drying, have been studied. It has been shown that degree of structural parameters' change upon drying decreases with increasing the concentration of the starting solution used in synthesis of hydroxides. It has been also established that adsorption capacity of samples decreases linearly with increasing surface tension of intermicellar liquid. Structural changes of samples and their causes have been discussed and explained from the colloidal chemistry viewpoint.
Komarov V. S., Leonenko L. L, Rat'ko A. L, Kostyuk S. A., Runetz L. P.
Effect of magnetic field on porous structure of hydroxides during their drying. pp. 26--29.
Summary: Drying of diamagnetic and paramagnetic metal hydroxides has been studied. It has been shown that sorption capacity of hydroxides with paramagnetic ions increases with magnetic field strength while for hydroxides with diamagnetic ones it remains virtually unaffected. The phenomenon has been explained by taking into account the effect of magnetic field on water structure, ion hydration and wettability of solvents. It has been established that sorption capacity depends linearly upon magnetic field strength.
Kudina E. E, Pechersky G. G, Ermolovich O. A.
On gel formation in systems based on alkaline silicates. pp. 30--34.
Summary: It has been demonstrated that there is a possibility to predict properties of both combined organosilicate systems and gels obtained from them, based on calculating the solubility parameter for initial reagents. Physico-chemical processes occurring during gel formation, depending on its preparation technology, have been studied by IR spectroscopy. It has been shown that organomineral systems based on liquid glass, acetic acid and glycerol can be used as stock compositions for preparation of stabilized combined systems capable of forming homogeneous durable gels at elevated temperatures.
Makarevich N. A., Palamarchuk I. A., Boytsova T. A., Brovko O. S., Afanasyev N. L, Fesenko A. V.
Hydrodynamic, molecular and conformational characteristics of lignosulfonates, chitosane and polyethylenepolyamine. pp. 35—40.
Summary: Hydrodynamic, molecular and conformational characteristics of lignosulfonic acid (LSA), chitosans (ChT) and polyethy-lenepolyamine (PEPA) have been estimated. It has been concluded that LSA is a randomly branched polymer, ChT is a rigid chain polymer, and PEPA is a linear polymer with very weak intermolecular interaction.
ANALYTICAL CHEMISTRY
Litvyak V. V., Grinyuk E. V., Pachytskaya I. M., Silich M. V., Moskva V. V.
Effect of physical modification on starch properties. pp. 41--45.
Summary: It has been shown that extrusion modification of potato and corn starch, as well as their mixtures, decreases moisture and sulfur dioxide content in them. It has been also established that extrusion treatment of corn starch significantly increases viscosity of its dispersions, as compared to native starch. This viscosity increase diminishes, however, at higher extrusion temperatures.
Leschev S. M., Zaidzel A. U.
Criterion for comparative evaluation of intramolecular interactions in organic nonelectrolytes. pp. 46--49.
Summary: Partition of more than twenty organic non-electrolytes has been studied in n-octane - water extraction system. Strong intramolecular interactions in these compounds cause substantial errors when calculating partition constants by traditional additive methods. A new parameter, Dlog Ð, has been introduced as a difference between the experimental partition constant and one calculated by an additive method. It works as a simple and informative criterion for estimation of intramolecular interactions in organic non-electrolyte molecules.
PHYSICAL CHEMISTRY
Grigorenko Yu. A., Semak I. V., Metelitza D. I., Shadyro O. I.
Fluorimetric stydy of methemalbumine with aromatic ligands. pp. 50--58.
Summary: Fluorescent spectra for l-aniline-8-naphtalenesulfonic acid (ANSA) probe complexes with bovine serum albumine (BSA), methemalbumine (4 mM BSA : 8 mÌ hemin) and its associates with aromatic ligands - 2,2,5,7,8-pentamethylchroman-6-ol (PMC), 3,3'5,5'-tetramethylbenzidine (TMB), and ortho-phenylenediamine (PDA) in buffered saline, pH 7.4, containing 5% of DMF, 0.5% of DMSO and 5% of ethanol. From fluorescence relative intensity (at its maximum of 480 nm) -– ANSA concentration relationships, linearized in Benesi-Hildelbrandt or Scatchard coordinates, association constants Ka for ANSA-BSA, ANSA-methemalbumin (and its complexes), as well as number-average amount n of ANSA molecules bound with biopolymers. Ka values decrease from 2,61·104 -- 1,60·104 Ì-1 Mr1 in the series of methemalbumine complexes in the following order: ÀÍÑ>ÐÌÑ+ÀÍÑ>ÒÌÁ+ÀÍÑ>ÔÄÀ+ÀÍÑ, and n values increase in the same series from 1.16 to 1.50. ANSA and aromatic ligands compete for binding to methemalbumin hydrophobic sites, the fact that has been confirmed by ANSA inhibiting effect on TMB and PDA oxidation in methemalbumin- Í202 "pseudoperoxidase" system.
ORGANIC CHEMISTRY
Dikusar E. A., Kozlov N. G, Potkin V. I.
Synthesis of E-3-alkoxy-4-acyloxyphenylmethylene(phenyl and e-cyclohexyl) amines. pp. 59--63.
Summary: Previously unknown Schiff bases, containing ether and ester groups, have been prepared by reaction of vanillal and vanillin esters with aniline and cyclohexylamine in 85-95% preparative yield. Liquid or low-melting esters react with aniline or cyclohexylamine under solvent-free conditions as well, affording Schiff bases in 98-100% yield and with ca. 90% purity.
Kauhanka M. M., Kauhanka U. M.
Synthesis and properties of some mesogenic benzylchlorides. pp. 64--67.
Summary: Substituted mesogenic benzylchlorides have been synthesized. These compounds are convenient intermediates for preparation of liquid crystals. The key step is chloromethylation reaction of aromatic compounds or reaction of benzyl alcohols with thionyl chloride.
Tarasevich V. A., Yuzhik L. L, Basalaeva L. I., Antonovskaya L. L, Belyasova N. A.
Synthesis and biocide properties of alkylated 4,5-dihydro-lH-imidazoles. pp. 68--73.
Summary: A series of novel alkylimidazoles and their derivatives have been prepared. The structure of compounds synthesized has been confirmed by IR and NMR 1H spectroscopy, as well as by elemental analysis data. Antibacterial and antifungal activity of compounds prepared has been studied.
Bei M. P., Yuvchenko A. P.
Synthesis of new maleopimaric acid amides andimides. pp. 74--78.
Summary: New maleopimaric acid amides and imides, including long-chain aliphatic amides and functionally substituted amides and imides, have been prepared.
Rubinov D. Â., Zheldakova T. A., Rubinova I. L., Lakhvich F. A.
Intramolecular cyclization of 2-acylcyclo-hexane-l,3-dionenaphtylaminoderivatives in presence of polyphosphoric acid. pp. 79--85.
Summary: Under heating in polyphosphoric acid 2-àñó 1-3-à- è -P-naphtylaminocyclohex-2-enones, as well as 2-(l-alkyliden-a- and b-naphtylamino)cyclohexane-l,3-diones undergo intramolecular cyclization yielding tetracyclic fused derivatives of benzofa]-, -[b]- è -[c]phenanthridine and benzofa]-, and -[c]acridine.
BIOORGANIC CHEMISTRY
Kisselev P. A., Schwarz D., Kisseleva S. N, Bovdey N. A., Schunk W.-H, Roots I.
Highly efficient hydroperoxide-dependent transformation of 17b-estradiol and estrone into procarcinogenic hydroxyl derivatives, catalyzed by human P-4501A1 cytochrome. pp. 86--91.
Summary: Oxidation of 17b-estradiol (E2) and estrone (El) in enzymatic system consisting of recombinant human cytochrome P-4501A1 and cumene hydroperoxide, has been studied. It has been shown that the only products of the reaction are 2- and 4-hydroxy estrogene derivatives. Maximum reaction rates, Michaelis constants and catalytic efficiency of this process have been determined. Possible physiological value of this reaction is discussed.
Sinelyov V. A., Babenko A. S., Mezhnina O. A., Usanov S. A.
Polymorphism of BDKRB2 andNOS3 genes vs.human physical efficiency. pp. 92--96.
Summary: Association of+9/-9 BDKRB2 gene and a/b NOS3 gene polymorphism with physical capacity of humans has been studied. Groups of 54 professional sportsmen and 98 non-sportsmen (control group) have been genotyped. It has been shown that -9/-9 genotype by BDKRB2 and bb genotype by NOS3 occur, with authentic statistical significance, more often in the sportsmen group than in the control group. No aa genotypes by NOS3 in the sportsmen group have been found. On this basis, optimal genotypes for heightened exercise tolerance and genotypes critically unsuitable for physical training have been found.
Yakimovich N. N, Yakimovich I. V., Bil'dyukevich A. A., Grin'ko V. N, Kuvaeva Z. I.
Effect of broth composition and culturing conditions on L-proline biosynthesis by Brevibacteriom flavum culture. pp. 97--101.
Summary: The effect of various factors such as temperature, pH of the medium, aeration level, broth component concentrations on biosynthesis of L-proline by Brevibacterium flavum producer strain has been investigated. On the basis of data obtained, fermentation conditions have been optimized, that allowed to increase L-proline accumulation in broth up to 70-75% and to decrease fermentation costs.
POLYMER CHEMISTRY
Krul' L. P., Yakimtsova L. Â., Matusevich Yu. I., Fedoruk S. L., Selevich K. A.
Thermal degradation of methyl methacrylate - methacrylamide copolymers. pp. 102--107.
Summary: Thermal degradation of methyl methacrylate - methacrylamide copolymers with varied unit content has been studied by the combined thermal analysis method including DSC and TG. The copolymers have been shown to be more stable, as compared to corresponding homopolymers.
GEOCHEMISTRY
Sokolik G. A., Ovsiannikova S. V., Voinikava E. V., Rakhman'ko E. M., Papenia M. V.
Migration-active forms of radium and uranium in soils of Belarus. pp. 108--113.
Summary: From specific 226Ra and 238U activities determined in soil substrate and soil pore solution at background levels of the radionuclide content, the total amount of radionuclide species that can participate actively in redistribution processes through the soil profile and enter into ground and surface waters, has been estimated.
TECHNICAL CHEMISTRY AND CHEMICAL TECHNOLOGY
Chernaya N. V., Lamotkin A. I., Kostyukevich A. V., Chubis P. A.
The effect of highy basic cationic polyelectrolyte upon paper-forming properties of sized waste paper mass. pp. 114--118.
Summary: It has been shown that hydrophobic properties and strength of paper and board are improved with introduction of modified resin hydrodispersion TMVS-2N, aluminium sulphate and strong-founden polyelectrolyte SA MX DMAPA in waste paper mass.
SCIENTISTS OF BELARUS
Krut'ko N. P., Rahmanov S. K., Lakhvich F. A. et al.
Fyodor Nikolaevich Kaputsky (On the occasion of 80th birthday). pp. 119--120
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Vityaz P. A., Rahmanov S. K., Chizhik S.S. et al.
Vladimir Enokovich Agabekov (On the occasion of 70th birthday). pp. 121--123
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