Polysaccharides of Beta vulgaris

M. V. Lomonosov Odessa Technological Institute of the Food Industry. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 848–850, November–December, 1991.     

Commutative properties of singularly perturbed operators

Suppose the self-adjoint operatorA in the Hilbert spaceH commutes with the bounded operatorS. Suppose another self-adjoint operatorā is singularly perturbed with respect toA, i.e., it is identical toA on a certain dense set inH. We study the following question: Under what conditions doesā also commute withS? In addition, we consider the case whenS is unbounded and also the case whenS is replaced by a singularly perturbed operator S. As application, we consider the Laplacian inL ₂(R ^q ) that is singularly perturbed by a set of δ functions and commutes with the symmetrization operator inR ^q ,q=2, 3, or with regular representations of arbitrary isometric transformations inR ^q ,q≤3.     

The p<Emphasis Type="Italic">K</Emphasis> spectroscopy study of the acid-base properties of hydrated aluminum oxide sols

The presence of acid-base groups of at least four types on the surface of a hydrated aluminum oxide sol particles is disclosed by pK spectroscopy. The diversity of these groups is likely caused by their different environments. A reasonably high exchange capacity of the particle surface, which decreases upon sol aging, may result from the presence of a residual gel layer.Translated from Kolloidnyi Zhurnal, Vol. 66, No. 6, 2004, pp. 807–810.Original Russian Text Copyright © 2004 by Ryazanov, Dudkin.     

Oxyammonolysis Products of Birch Wood and Its Principal Components

The composition of products from oxidative ammonolysis of the principal components of birch wood by mechanochemical treatment with atmospheric oxygen and ammonium persulfate in aqueous ammonia was studied.     

Isolation of the galactan ofPhyllophora nervosa and characterization of its structure

Summary 1. The chemical composition of the galactan of the Black-Sea algaPhyllophora nervosa has been established and its structure has been studied. The polysaccharide is linear and is constructed of D-galactose residued connected by 1 3 glycosidic bonds and of 3,6-anhydro-D-galactose residues connected by 1 4 bonds:-(4-0--D-Galp-13--D-3,6-AhGalp-1)-.2. The ester nature of the bond of the sulfuric acid residues with the primary and secondary carbon atoms of the galactose residues has been shown.M. V. Lomonosov Odessa Technological Institute of the Food Industry. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 693–698, November–December, 1976.     

Carbohydrates ofSymphytum asperum

It has been shown that the carbohydrates ofSymphytum asperum L. — a promising fodder plant — include water-soluble polysaccharides, pectin substances, protopectin, hemicelluloses, a glucomannan, and cellulose. The quantitative amounts of the polysaccharide fractions in the raw material have been established and their characteristics are given. The protopectins of the leaves and stems ofSymphytum asperum L. have been characterized. Their macromolecules are based on a fragment constructed of D-galacturonic acid residues linked by -glycosidic bonds.M. V. Lomonosov Odessa Technological Institute of the Food Industry. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 15–20, January–February, 1984.     

On the possibility of determining the thermodynamic temperature of colloid solutions by the nuclear magnetic resonance method

A new method of determining the thermodynamic temperature of colloid solutions placed onto a sealed glass vessel is considered; the method is based on measurements of the magnetic susceptibility in flowing liquid by the magnetic nuclear resonance method. Experimental results show that the Curie law holds for colloid solutions in the temperature range of 278–333 K, in which ferrofluid cells prepared based on these solutions are used.