Chemistry

2003, The Second Special Issue

S.V. Korkina, Y.V. Akimenko, V.M. Rutskiy, P.P. Purygin

INVESTIGATION OF RAILWAY ROLLING STOCK EXHAUSTS BY SNOW PROBES

In the paper results of investigation of railway rolling stock exhausts obtained by snow probes taken in the right-of-way of railway track at the Sovety station of the Kuibyshev Railway are presented.

S.V. Lapshin, S.Y. Kudryashov, L.A. Onuchak, Y.G. Stupnikova

ADSORPTION PROPERTIES OF DIFFERENT SAMPLES OF GRAPHITIZED THERMAL CARBON BLACK, MODIFIED BY A CHOLESTERIC LIQUID CRYSTAL MONOLAYER

Adsorption of n-alkanes and aromatic compounds on unmodified and the modified by cholesteric liquid crystal graphitized thermatomic blacks (GTCB) of different marks is investigated. The retention variation of adsorbates on columns with different samples of GTCB, and also agency of heterogeneity of GTCB surface on thermodynamic properties of adsorption at surface modification by a mesogen monolayer are considered.

L.A. Onuchak, I.M. Mukhanova, E.P. Sokolova, A.A. Kolesova, O.B. Akopova

SORPTION OF HYDROCARBONS BY A BINARY INTERMIXTURE OF LIQUID CRYSTALS WITH DISCOTIC AND CALAMITIC SHAPE OF MOLECULAS

The sorbtion and selective properties of the binary liquid crystal (LC) sorbent on a base of discotic 2,3,6,7,10,11-hexaoctyloxybenzoate triphenylene (HООBТ) and nematic 2-acetylhydroxyquinon-bis-[4-n-hexylbenzoate] (АHQB) (composition 90,5 : 9,5%) are investigated by gas chromatography (GC) method in temperature interval of 20-185^o, including solid crystal state of the sorbent. As sorbates n-alkane (C₇-C₁₂), cyclohexane, benzene, toluene, orto-, meta-, para-xylene and ethylbenzene are investigated as well. It is found, that addition of АHQB to HООBТ results in increase of investigated sorbate solubility. Especially this effect is observed on cyclohexane and aromatic substances. The mixed sorbent, as contrarily individual LC HООB and АHQB, has no structural selectivity that is shown on an example of test pair of isomers meta- and para-xylene.

Y.P. Zarubin, D.V. Mirgorodsky, P.P. Purygin, I.A. Ilicheva, V.L. Florentev

THEORETICAL STUDY OF ADENOSINE AND ITS ISOSTERIC ANALOGUES. A POSSIBLE MECHANISM OF THEIR BINDING IN AN ACTIVE SITE OF MAMMALIAN ADENOSINE DEAMINASE

Adenosine and its isosteric analogues including their N1-protonated forms (except for that of 1-deazaanalogues) are studied by computer modelling to find a relationships between their molecular structures and substrate properties for the mammalian adenosine deaminase. The atomic charge distribution and maps of the electrostatic potential around their van der Waals molecular surface are calculated for these compounds by using the ab initio STO-3G method. The conformational studies are carried out by the MM+ method of molecular mechanics. A mechanism of binding that determines the substrate selectivity of mammalian adenosine deaminase is discussed. The potential substrate properties are predicted for earlier unstudied adenosine analogues.