On Composition Factors of Finite Groups Having the Same Set of Element Orders as the Group U3(q)

We study the composition factors of a finite nonsolvable group having the same set of order elements as the simple unitary group U ₃(q) for an odd q. We prove in particular that for q>5 the (only) nonabelian composition factor of such a group is isomorphic to U ₃(q).     

Chemistry and technology of biocatalyzed nanoengineering of linen textile materials

The concept of nanoengineering of linen textile materials, realizing spatially localized effects of protein catalysts on polymeric cellulose companions and securing selective splitting of impurity compounds with preservation of technologically valuable nanoformations of binders in the fiber structure, is presented. The regulated degree of conversion of polysaccharides with the use of degradation products as secondary reagents for chemical transformations of lignin and polyphenolic compounds leads to the production of materials with new or improved functional and consumer properties.     

Comparison of the reducing power of aldose solutions

Concentration and temperature dependences of the redox potentials of neutral and alkaline solutions of glucose, mannose, galactose, galacturonic acid, and xylose were measured. Axial orientation of the secondary hydroxy groups in epimeric hexopyranoses, oxidation of C⁶ to carboxy group, and the lack of primary hydroxy group in going to aldopentopyranose favor increasing (in the order of listing) destabilization of their cyclic structure, formation of the oxo form, and thermally activated retro-aldol reaction of the latter in alkaline medium. This leads to enhancement of their reducing power and chemical reactivity toward 5,5′,7,7′-tetrabromoindigo.     

The Influence of the Structure of Pectin Substances of Flax Fodder Supplements on Absorption Binding of Azaheterocyclic Mycotoxins

Russian Journal of General Chemistry - The article presents a comprehensive approach to the investigation of the features of the chemical and supramolecular structure of pectin substances from...     

ZnO nanorod arrays fabrication via chemical bath deposition: Ligand concentration effect study

A new ligand, N,N,N′,N′-tetramethylethylenediamine, has been used to grow ZnO nanorods on silicon substrates via a two steps approach. A preliminary seeding on silicon substrates has been combined with chemical bath deposition using a Zinc acetate–N,N,N′,N′-tetramethylethylenediamine aqueous solution. The used diamino ligand has been selected as Zn²⁺ complexing agent and the related hydrolysis generates the reacting ions (Zn²⁺ and OH⁻) responsible for the ZnO growth. The seed layer has been annealed at low temperature (<200 °C) and the ZnO nanorods have been grown on this ZnO amorphous layer. There is experimental evidence that the ligand concentration (ranging from 5 to 50 mM) strongly affects the alignment of ZnO nanorods on the substrate, their lateral dimension and the related surface density. Length and diameter of ZnO nanorods increase upon increasing the ligand concentration, while the nanorod density decreases. Even more important, it has been demonstrated, as proof of concept, that chemical bath deposition can be usefully combined with colloidal lithography for selective ZnO nanorod deposition. Thus, by patterning the ZnO seeded substrate with polystyrene microsphere colloidal lithography, regular Si hole arrays, spatially defined by hexagonal ZnO nanorods, have been successfully obtained.     

The Properties of Sodium Alginate Hydrocolloids upon Sorption Binding of Papain

Colloid Journal - The regularities of the adsorption immobilization of papain in strongly and weakly acidic colloidal solutions of sodium alginate under low-speed stirring have been studied to...     

A setup for active neutron analysis of the fissile material content in fuel assemblies of nuclear reactors

An active neutron method for measuring the residual mass of ²³⁵U in spent fuel assemblies (FAs) of the IRT MEPhI research reactor is presented. The special measuring stand design and uniform irradiation of the fuel with neutrons along the entire length of the active part of the FA provide high accuracy of determination of the residual ²³⁵U content. AmLi neutron sources yield a higher effect/background ratio than other types of sources and do not induce the fission of ²³⁸U. The proposed method of transfer of the isotope source in accordance with a given algorithm may be used in experiments where the studied object needs to be irradiated with a uniform fluence.     

Effect of hydroxyethylated alkyl phenol and triethanolamine on absorption of atmospheric oxygen by aqueous-alkaline solutions

Changes in the driving force of the multistage interphase transfer of atmospheric oxygen in the presence of a nonionogenic wetting agent and triethanolamine were assessed by using analytical solutions of the film model of mass exchange at the phase boundary to describe the chemisorption uptake of oxygen by a sodium dithionite solution.