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The absorption of millimeter electromagnetic radiation (v=1.4, 1.71, and 5 cm−1) by aqueous solutions of glycine (pH 6.1–6.2) in the concentration range of 0.5–2.5 mol L−1 was measured. It was found that the absorbing ability of the water present in the solutions, is higher than that of pure
water. This phenomenon is explained by the presence of a center of negative hydration in the structure of the glycine zwitterion,
which results in an increase in the rotational mobility of water molecules immobilized in the hydrate shell of the glycine
zwitterion.
For Part 5, see Ref. 1.
Deceased.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1305–1307, July, 1997. 相似文献
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G. V. Zavizion 《Ukrainian Mathematical Journal》1997,49(12):1819-1826
An asymptotic solution of a system of inegro-differential equations is constructed for the case where turning points are present.
Vinnychenko Kirovograd Pedagogic Institute, Kirovograd. Translated from Ukrainskii Matematicheskii Zhurnal. Vol. 49, No. 12,
pp. 1617–1623, December, 1997 相似文献
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The effect of urea on the structural stability and functional activity of globular proteins,viz., chymotrypsinogen A (ChtG) and -chymotrypsin (Cht), was studied over a wide range of concentrations (0.5–6 rnol L-1), and the existence of two different mechanisms of the action of urea on these proteins was demonstrated. No changes in the spatial structure of ChtG were observed in the concentration range from 0,5 to 3 mol L–1 (region 1). Differential UV spectroscopy shows tile redistribution of aromatic groups between the inner volume and the outer surface of a protein molecule (protein denaturation) at concentrations >3 mol L–1 (regionII), In regionI, urea changes the kinetic parameters of enzymatic reactions involving Cht, which is explained on the basis of millimeter spectroscopy data by its action on the structure and nucleophilic reactivity of water.Deceased.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 998–1002, April, 1996. 相似文献
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We prove the existence and infinite differentiability of a solution of a singularly perturbed linear system of differential
equations with deviating arguments and a turning point. 相似文献
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Yu. I. Khurgin O. V. Lebedev E. Yu. Maksareva V. A. Zavizion V. A. Kudryashova M. M. Vorob'ev G. A. Orekhova A. N. Danilenko 《Russian Chemical Bulletin》1995,44(6):1138-1139
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1178–1179, June, 1995. 相似文献
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A study has been made of the concentration dependence of absorption of radiation at 5 cm–1 by aqueous solutions of urea and its N-methyl, N,N-dimethyl, N,N'-dimethyl, and tetramethyl derivatives; and their effective hydration numbers have been calculated. The low values obtained for the effective hydration numbers of urea, N-methylurea, and N,N'-dimethylurea are explained by the close mutual approach of the two hydrogen atoms in the trans position relative to the carbonyl group (negative hydration); in the case of the N,N-dimethyl and tetramethyl derivatives, no negative hydration effect is observed. For the tetramethylurea, very definite hydrophobic hydration is observed. On the basis of data obtained on the effective hydration number, an estimate has been made of the relative contents of different conformers of methylurea and N,N'-dimethylurea in solution.For Previous Communication, See [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 321–326, February, 1990. 相似文献
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