Ni–Sn powder alloys with a nickel content from 24.4 to 78.5 at.% and from 30.6 to 55.1 at.%, respectively, were synthesized chemically and electrochemically for the use as catalysts for the hydrogen electrochemical reduction (HER) in alkali solution. It was established that the catalytically active surface area of chemically synthesized powders was larger in comparison with electrochemically obtained ones. Ni24.4Sn75.6 powder alloy has the largest surface area. It was found that catalytic properties of chemically synthesized powders increased in the row Ni24.4Sn75.6 < Ni78.5Sn21.5 < Ni. Electrochem ically obtained alloys are inefficient as HER catalysts. It was found that Ni24.4Sn75.6 alloy is characterized by the greater re tention of catalytically active surface area during exploitation in alkali solution in comparison with Ni and Ni78.5Sn21.5 alloy. 

The process of flocculation of a calcium-magnesium solid phase formed in an aqueous-salt solution with the introduction of calcium-containing precipitants using polyacrylamide, cationic and anionic acrylamide copolymers was studied. With the introduction of polymers, an increase in the dispersion settling rate was observed in the concentration range of 0.5–3.0 mg/g, to a greater extent for the anionic copolymer. In the presence of an amine-containing surfactant, the sedimentation rate increased with the introduction of polymers by a factor of 1.1–1.3 compared to dispersions without surfactants. Using an anionic copolymer as an example, it was shown that the adsorption of amine and the sedimentation rate of dispersion increase with the increase of the polymer molecular weight. It was found that the concentration of the anionic copolymer and the pH of the medium also influence the adsorption of amine. Based on the obtained data, an effective method of water-salt solutions purification from amine-containing surfactants and magnesium salts (purification degree 99.5–99.8 %) that can be used at mining and processing enterprises was developed.

The synthesis of previously undescribed 22- and 23-deoxyanalogues of homocastasterone has been carried out, which makes it possible to obtain target compounds without replacing the carbon skeleton of the side chain. The key reactions in their synthesis were epoxy ring opening and radical debromination.

Various adamantane derivatives were obtained by the condensation of rimantadine with substituted hydroxy-benzaldehydes, esters and ethers based on them, as well as 1,2-azole-3-carbaldehydes, followed by reduction. Further acylation of derivatives with active amino and hydroxy groups yielded compounds containing two 1,2-azole fragments in one molecule.

The Sso7d protein has exceptional structural stability and the ability to bind highly specifically to DNA, which makes the protein a promising module for creating fusion proteins and test systems. Sso7d is a part of fusion high-fidelity DNA polymerases capable of carrying out the polymerase chain reaction even in the presence of PCR inhibitors. Application of faster, simpler, and more efficient method for protein production will significantly reduce the cost of creating biosensors and conducting analyzes. This paper describes a new efficient method for obtaining recombinant Sso7d protein with a high degree of purity without using affinity chromatography.

The objects of study were the process of frontal copolymerization of acrylamide with sodium acrylate in aqueous solutions in tubular reactors of various diameters and with different directions of front propagation, as well as the resulting copolymers and hydrogels. The effect of the diameter of a tubular reactor and the direction of front propagation on the process of frontal copolymerization of acrylamide and sodium acrylate in aqueous solutions has been studied. It was shown that the front velocity is almost independent of the diameter of the tubular reactor, and the front temperature decreases with increasing diameter. The values of water absorption and gel-fraction of the obtained hydrogels were determined.

Hybrid hydrogels have been synthesized by radiation grafting of acrylamide to chitosan chains. The structure of the acrylamide-grafted chitosan was examined using FTIR spectroscopy, X-ray diffraction and simultaneous thermal analysis. It has been determined that both hydroxyl and amino groups of the polysaccharide are the grafting centers of growing polyacrylamide chains on the chitosan macromolecules. The effect of the reagents ratio on the sorption and rheological properties of the obtained hydrogels has been studied. Hydrogels based on acrylamide-grafted chitosan were modified chemically by alkaline hydrolysis, and the effect of hydrolysis on the sorption capacity of hydrogels with respect to water and Cu(II) ions was examined.

The modification of rosin resin acids, which improves their hydrophobic effect on paper and cardboard, is based on the implementation of 6 stages. Control of chemical processes at each stage is carried out by monitoring and regulating temperature and flow parameters, which determine the achievement of the required physical and chemical properties and composition of intermediates and final substance. One of the main indicators is the acid number, which for the final substance should be 60–70 mg KOH/g, which corresponds to the content of free resin acids in the functional substance of 40–45 %. The fulfillment of the specified temperature and consumption parameters for the modification of resin acids of rosin and the achievement of the necessary physicochemical properties of intermediates at each stage ensures the production of a functional substance with an improved hydrophobic effect on paper and cardboard. Compared to the traditionally used TM adhesive-paste, the developed functional substance in the production of paper with absorbency at one-sided wetting of not more than 21 g/m² provides a reduction in the content of particles of the dispersed phase of the rosin emulsion by 1.4–2.0 times, which indicates its improved properties, and maximum preservation of the original strength of the paper by reducing the distance between the fibers due to a 3.3–3.8 times reduction (from 4200–5000 to 1100–1480 nm) in the size of sizing complexes.