The perspectives of using ion-exchange soils for growing plants in zero-gravity field are described. Standard methods for obtaining ion-exchange soils are not suitable for weakly dissociating ion-exchangers. Methods for obtaining ion-exchange soil based on weakly dissociating fibrous ion exchangers are proposed. The method using concentrated solutions made it possible to obtain ion-exchange soils with a larger content of deficient ions (K+ , NO3 – ). The suitability of the obtained ion-exchange soils was confirmed by a biological experiment.

Titania-silica membranes on a porous quartz substrate are prepared by its direct contact with metal silicate sol at various Ti/Si ratios in the conditions of coagel sedimentation and presence of cetylpyridinium chloride. The study of textural and adsorption properties of membranes is conducted by low-temperature nitrogen adsorption-desorption, including methods of t-plots and DFT theory. It was shown that obtained membranes have mesoporous structure with the specific surface area and pore hydraulic diameter varied in intervals of 64–217 m2 /g and 4–11 nm, respectively. Developed values of surface area remain up to molar ratio of Ti/Si = 50/50.

Magnesium oxide is widely used as an adsorbent, catalyst, identifier of chemical and toxic pollutants, in water and gas purification processes. Mesoporous magnesium oxide powder has been synthesized by the method of deposition, spray pyrolysis and glycine-citrate-nitrate method, their crystal structure, microstructure, granulometric composition and adsorption properties have been studied. Optimal conditions for the production of magnesium oxide by the glycine-citrate-nitrate method have been determined, which make it possible to obtain a powder with average primary particle sizes of 12 nm and the smallest sizes of secondary particles starting from 70 nm. The influence of the method of obtaining nanostructured magnesium oxide powder on the physicochemical properties is established. High values of the total pore volume of 1.038 cm3 /g exhibited the MgO powder obtained by the precipitation method.

A method of simultaneous determination of altax, captax, thiuram D, thiuram E, thimate and ethylthimate in aqueous extracts in the sanitary-chemical analysis by high performance liquid chromatography has been developed. Determination was based on the gradient separation of altax, captax, thiuram D, thiuram E, thimate, ethylthimate extracted by water from test objects using Waters XTerra MS C18 column of 250 mm length, internal diameter 4.6 mm, graining phase 5 μm, while UV detection wavelengths were 265 nm and 320 nm. Retention times were 10.3±0.2 min for altax, 3.6±0.2 min for captax, 9.0±0.2 min for thiuram D, 12.3±0.2 min for thiuram E, 11.0±0.2 min for thimate, 15.5±0.2 min for ethylthimate. It has been shown that the method is linear in the range of 0.05–0.60 mkg/ml for altax, 0.005–0.60 mkg/ml for captax, 0.005–0.75 mkg/ml for thiuram D and thiuram Е, 0.01–0.90 mkg/ml for thimate and ethylthimate. Using the calibration graph and standard deviations of analytical signal, following limits of quantification were calculated: 0.01 mkg/ml for altax, 0.002 mkg/ml for captax, 0.003 mkg/ml for thiuram D, 0.005 mkg/ml for thiuram Е, 0.01 mkg/ml for thimate and ethylthimate.

UV-spectrophotometric and chromatographic studies of the distribution of trifluoroacetophenone (TFAF) and a number of its derivatives (heptyl ether of p-trifluoroacetylbenzoic acid (HE p-TFABA), p-methyltrifluoroacetophenone (p-MTFAF), 2,4-dimethyltrifluoroacetophenone (DMTFAF), 2,4,6-trimethyltrifluoroacetophenone (TMTFAF)) in a hexane-water system, which simplifies the modeling of a polyvinyl chloride membrane carbonate and sulfate-selective electrodes, were performed. These substances are used as neutral carriers (NC) in membranes of ion-selective electrodes, reversible to double-charged inorganic anions. A systematic study of the hydration of TFAF and a number of its derivatives was carried out. TFAF has increased solubility in water (the distribution coefficient D is 415) as compared to p-MTFAF, DMTFAF, TMTFAF and HE p-TFABA (D within 1360–2700), which does not allow to recommend it as an NC for making electrode membranes. The strongest hydration occurs for the HE p-TFABA in the alkaline medium. It has been found that p-MTFAF and HE p-TFABA form crystalline hydrates. The selectivity coefficients of carbonate and sulfate-selective electrodes were determined for all the NC studied and a number of them were made to improve the selectivity of the electrodes: TFAF k p-MTFAF k DMTFAF k TMTFAF k p-BTFAF (p-buthyltrifluoroacetophenone) k HE p-TFABA.

New derivatives of purine nucleosides containing the residues of N,N-diethylethylenediamine or N-(2-aminoethyl)pyrrolidine in 6-position of heterobase have been synthesized. The one-step preparation of 6-N-substituted nucleosides was performed in good yields by the amination of 6-Cl-derivatives of O-acetylated purine nucleosides and concomitant deacylation of OH-groups of a carbohydrate moiety with N,N-diethylethylenediamine or N-(2-aminoethyl)pyrrolidine.

Results of the study of the drug from calcium salts of amino acids (calcium diglycinate, calcium di-L-prolinate) on the model of osteoporosis in animals are described. The test substance was found to have better therapeutic effect in the regeneration of bone tissue in comparison with the drug containing calcium carbonate. The drug containing calcium salts of glycine and L-proline can be used for prevention and treatment of osteoporosis.

A reagent kit EIA-DEOXYNIVALENOL for the determination of mycotoxin deoxynivalenol (DON) in feeds and foods by a direct competitive enzyme immunoassay using microtitration plate has been developed and tested. The basic components of the kit are polyclonal antibodies to DON, obtained as a result of immunization of rabbits with a conjugate of DON with bovine serum albumin and a conjugate of horseradish peroxidase with DON. The evaluated parameters of the kit and metrological characteristics of the technique of measurements correspond to the modern level of immunoassay development and provide the determination of DON content of agricultural products in a range of 0.2 to 6.0 mg/kg with proper accuracy and precision. The limit of quantitative determination of DON in grain and cereal foods does not exceed 0.2 mg/kg.

Dissolution of acrylamide anionic (co)polymers in saline solutions (potassium and sodium chlorides) with concentration of 3.4 mol/l was studied by atomic absorption spectroscopy, optical microscopy, gel-test and capillary viscosimetry. It has been established that with increasing in the content of ionogenic groups and the transition from sodium chloride to potassium chloride solutions the dissolution rate of (co)polymer increases. The concentration of cations of low molecular weight electrolytes is higher in the swollen polymer phase than in the solution in the swelling stage of polymers, the difference in the counter ion content decreases with increasing dissolution time. Comparative analysis of the Huggins constant and the hydrodynamic radii of acrylamide (co)polymers has showed that increase in the interaction in polymer-solvent system is accompanied by the increase in size of macromolecular coils. The Kuhn segment of polymer macromolecules is higher in sodium chloride solutions than in potassium chloride solutions and increases with the decrease in ionogenic group content.

The results of laboratory studies of the composition and physical properties of span series rocks of the Pribug structure within the eponymous underground gas storage (UGS), have been presented. The rocks are represented by a finegrained quartz sandstone with various sorting and grain roundness, type of cementation and clay content. The character of section suites changes for the material composition of the rocks and their physical properties have been set. The examined properties specify reservoir rocks characteristics which are widely used for integrated geophysics well data interpretation, geological and hydrogeological UGS modeling, making recommendations for increasing efficiency of pore volume usage during gas storage operation. Rock intervals with poor porosity and permeability are detected inside the examined rock series.

In the present study the distribution of long-lived radionuclides between the drug product, recovered water [ 18O]H2 O and solid phase extraction cartridges was studied in [18F]fluorocholine production process. Isotopic composition for long-lived nuclides (half-lives = 10–312 days) was determined, the mechanisms of their formation and accumulation on cartridges are considered. It was shown that in the batches of pharmaceutical produced the content of long-lived nuclides is by 5 orders of magnitude lower than the limit value specified by the appropriate 07/2016:2793 European Pharmacopoeia article. The results obtained are of vital importance for optimization of the procedures for radioactive waste management in the production of [18F]fluorocholine using IBA Cyclone 18/9 HC cyclotron and, consequently, for minimization of radiation exposure of personnel.

The influence of the regimes of separate stages of the mechanochemical treatment of the aluminum surface including degreasing of the surface with acetone; etching Al in a solution of sodium hydroxide; coarse grinding; chemical polishing in an alkaline glycerol-containing solution; fine grinding; finishing chemical polishing in an alkaline glycerol-containing solution is investigated. These pre-treatment steps allow to optimize the process of obtaining the necessary surface roughness for its subsequent electrochemical nanostructuring. Changes in the structure of the aluminum surface after each stage of preparation were controlled by optical microscopy. Obtained profilograms after the proposed processing of the surface of aluminum indicate getting the roughness parameters necessary for the subsequent nanostructuring of the surface by electrochemical anodizing.

The choice of the Karatau phosphorites (The Republic of Kazakhstan) as a perspective phosphorus-containing raw material for Belarusian producers is substantiated. The process of activation of phosphate of the Zhanatas deposit (Karatau basin (Kazakhstan)) in a drum ball mill, a dismembrator and a vibratory mill was researched. The influence of solid potassium- and nitrogen-containing components (potassium chloride, ammonium sulfate, urea) on the activability of the phosphorites has been studied. Under optimum conditions more than 60 % of P2 O5 of phosphorite can be transferred to the digestible form by the “dry” method, which is a prerequisite for the development of a non-waste and environmentally safe technology for the production of NPK fertilizers.