BiVO₄, Ca₃(VO₄)₂ and mixed Ca₃(VO₄)₂ BiVO₄ vanadates of chemical composition have been synthesized by solvo-thermal method. Dispersibility of obtained BiVO₄ pigment is 3,33-0,20 цгп^-1, oil adsorption for BiVO₄, Ca₃(VO₄)₂ and mixed Ca₃(VO₄)₂ BiVO₄ pigments is 24, 23 and 21 g for 100 g of the pigment respectively, density of all synthesized pigments is in range of 4,4-4,7 g/dm³. pH value of aqueous suspensions for all obtained pigments is in range of 7,0 ± 0,5 that provides immunity of steel substrate in contact with pigments. In presence of pigments (5g/l in 3% sodium chloride solution), corrosion current decreases 2,4 times with BiVO₄; 5,8 times with Ca₃(VO₄)₂ BiVO₄ and 7,6 times with Ca₃(VO₄)₂.

Synthesis of silica gel using salt templates (Na₂SO₄ and MgSO₄) introduced into washed silica in certain amounts, has been studied. It has been shown that increasing the template content in the gel strongly improves sorption capacity of samples during their drying, while the specific surface area decreases. It has been found that MgSO₄ template, due to its salting-out action, promotes the formation of the micropore volume in the silica gel porous structure, that increases with the template content, and depending upon sample drying conditions.

The effect of the salt template nature on structural parameters of silica gel has been studied. It has been shown that this effect depends on the ions’ hydration heat as well as the template concentration in the silicic acid gel and the temperature of its preliminary drying.

The possibility for determining the concentration of aluminum in aqueous solutions by stripping voltammetry has been demonstrated. The method is based on electrochemical cathodic aluminum accumulation on a vibrating mercury film electrode with subsequent registration of anodic current on the potentiodynamic voltammogram. Unlike conventional electrochemical methods of indirect determination of aluminum, based on the analysis of the adsorbed complexes of aluminum with dyes, the proposed approach allows to realize the direct determination of aluminum without binding it into coordination compounds. The method is based on the process of reversible reduction and oxidation of aluminum at pH 3,0-4,5 in aqueous dimethyl sulfoxide electrolyte containing calcium chloride, discovered by the authors, and has relative standard deviation of 1,8-2,4% in the aluminum concentration range from 10^-4 to 10^-5 g/dm³.

The distribution of a number of pesticides (anilinopyrimidines, dinitroanilines, carbamates, sulfonamides, thiocarbamates, phenylureas, organophosphorus compounds, chloroacetanilides and others) in different extraction systems has been studied at 20±1 ºC. The distribution constants (P) and the values of the functional groups increments of the pesticide distribution constants between hexane and the polar phase have been calculated. The factors that affect these values have been discussed. The prediction possibility of the pesticide distribution constants on the basis of the principle of distribution Gibbs energy additivity, or the method of group increments, has been considered. The prediction accuracy of this method has been estimated.

The change of zeolite properties of the ‘Noyemberyanskoe’ deposit (Armenia) after their processing with alkaline and acidic solutions (1­6 mol/dm3 ) has been studied by X­ray diffraction and dip pycnometry. It has been established that chemical composition and specific total pore volume of clinoptilolite were changed, and also new phases, such as sodalite, gismondine and fillipsite, were formed at sodium hydroxide concentration of ≥ 2 mol/dm3 . It has been found that increasing the hydrochloric acid concentration up to ≈ 6 mol/dm3 leads to size and form change of clinoptilolite sorption channels, and further increase causes its destruction. The method of low­temperature nitrogen adsorption­desorption proved the presence of mesoporous constituent in a clinoptilolite rock.

Synthesis of androgen 19-nortestosterones via new synthetic scheme has been achieved. The synthesis commenced with commercially available testosterone propionate which was transformed to 3β-acetoxy-17β-propyonyloxy-androst-5-en. Hypobromous acid was added to the 5(6)-double bond of the latter compound leading to 3-acetate 17-propionate 5-bromo-5αandrostane-3β,6β,17β-triol that was oxidized by lead tetraacetate giving the 3-acetate 17-propionate 5-bromo-6β,19-oxido5α-androstan-3β,17β-diol. Selective hydrolysis of the acetate group of the latter provided 17-propionate 5-bromo-6β,19-oxido5α-androstan-3β,17β-diol. Oxidation of the 3β-hydroxy group of the obtained compound by chromic acid followed by reduction of the resulting 3-keto group by zinc dust in methylethylketone gave 19-hydroxytestosterone-17-propionate. Oxidation of the resulting 19-hydroxysteroid by chromic acid and subsequent decarboxylation of 19-carboxylic acid by its heating in a mixture of pyridine and benzene led to the target 19-nortestosterone propionate.

Using methods of activated esters or mixed anhydrides to increase peptide chain, L-prolyl-L-leucylglycine has been prepared from L-prolyl-L-leucine.

А number of fluorobenzoates have been synthesized from 3-(2,3-difluoro-4-metoxyphenyl)-5-hydroxymethyl-2isoxazoline. Antimycobacterial properties of the synthesized compounds have been studied.

The synthesis of aromatic functionally substituted azomethines by condensation of functionally substituted aromatic aldehydes and aromatic amines has been described. The functionally substituted azomethines can serve as starting compounds for making optical materials.

Method for preparation of 5-aminolevulinic acid (ALA) aliphatic esters with aliphatic alcohols (С1–С16) is described. Melting points, spectral parameters and chromatographic characteristics for the esters obtained have been determined. Critical micelle concentration values of ALA hexyl ester and higher homologs in aqueous buffered system have been estimated. The stimulatory effect of micelle forming ALA esters at 0.1 mM concentration on the accumulation of phototrophic microalgae Chlorella and Scenedesmus obliquus dry biomass has been established (106–182% of the control).

A reagent kit EIA-AFLATOXIN for the determination of mycotoxin (aflatoxin B₁) in feeds and foods by direct competitive enzyme immunoassay (EIA) has been developed and tested. The evaluated technico-analytical parameters of the kit and metrological characteristics of the measurement technique correspond to the modern level of EIA development and provide the determination of aflatoxin B₁ content in agricultural products in the range from 2.0 to 50.0 mg/kg with proper accuracy and precision.

Growth hormones (GH) are polypeptides that trigger different biochemical pathways. GH main function is to regulate anabolic and catabolic processes. GH also plays an important role as immunomodulator. In this paper, molecular cloning, heterological expression and purification of the recombinant G. gallus growth hormone have been conducted. Two biotechnological schemes have been developed: cytosol expression followed by inclusion bodies solubilisation and periplasmatic secretion. Expression levels of 2.43 and 15 mg per 1 liter of bacterial culture respectively were achieved. It has been shown that the best way of expression is periplasmatic secretion, which does not require complex solubilisation and refolding procedures and results in higher product yield and purity.

Immunomodulating activity of 13-aza-11-oxa-9-oxo-10-methyl-5-(3-methoxyphenyl)-1,2,3,4-tetranorprost-8(12)-ene obtained by us earlier is discussed. Alternative method of its synthesis on the basis of Meldrum’s acid as a readily available starting material is described.

The analysis of specific features of the geological structure within the Brest region territory has been performed, on the basis of which settlements for radon monitoring have been selected. The technique has been described and results of the volume activity of radon in air of living, public and industrial buildings, equivalent to equilibrium volume activity of radon (EROA_Rn) and annual effective doses (E_Rn) population’s irradiation caused by radon and its decay products, have been shown. Average values in various administrative districts of Brest region are within the range from 15 to 60 Bq/m³ . The value of 200 Bq/m³ has been determined in one building of Kamenets district of Brest region. The maximum average of annual effective doses of population’s irradiation is from 6,8 to 13,9 m3v/year.

It has been established that the reason for stability of peat bitumes during metamorphism process is the presence of “quasipolyconjugation” systems caused by synergistic effect of the interaction of individual aromatic rings and hydrogen bondings functional groups.

Results of research for the glass system Na₂O-K₂O-B₂O₃-SiO₂ at 2:1 molar ratio of K₂O/Na₂O modifiers are presented. It has been found that increasing (K₂O+Na₂O)/B₂O₃ ratio in glass compositions leads to higher low-temperature viscosity and viscosity gradient in the range of 10⁹-10⁴Pa-s. The established temperature dependences of viscosity allow to optimize borosilicate glass compositions with predetermined characteristics, as well as technological parameters of their synthesis and formation.

Regularities of sodium polysilicates’ synthesis from suspensions of amorphous silica materials with limited water content have been establishmented. Granular insulating materials with good heat and sound insulating properties have been obtained.

The article presents a study on self-propagating high-temperature synthesis of mineral matrix based on the pyrochlore phase (Y₂Ti₂O₇) and zirconolite (CaZrTi₂O₇) for immobilization of actinide waste (HLW). The results of thermodynamic analysis of system Ti-ZrO₂-CaO-Y₂O₃-Me_nO_m (Me = Mo,Fe,Ni,Cr,Mn,Cu) are presented. The formation and mass ratio of crystalline phases in the SHS products have been found to depend both on the charge composition and on the concentration of HLW. The possibility of producing a matrix based on the structure of pyrochlore titanate Y₂Ti₂O₇enriched with zirconium has been demonstrated.

The effect of silicon dioxide (SDO) on the physico-chemical properties of urea-formaldehyde resins and plywood made with the modified resins, has been studied. SDO addition to the resin increases its acidity and reactivity. This reduces the consumption of catalyst for resin curing 1,5−2,0 times, and plywood, obtained using SDO, has higher mechanical strength.

Knowledge on sodium sulfate behavior in the silicate melts at the different synthesis conditions as a promising component of the batch for the production of hollow glass microspheres was extended.