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Accumulation levels were determined for polycyclic aromatic hydrocarbons (PAHs) in naturally occurring objects over the territory of dispersing the emissions of the Irkutsk Aluminum Plant “IrkAZ–Sual”: in the snow cover, soil, pine needles (Pinus sylvestris L.) and larch needles (Larix sibirica), in water and the bottom sediments of the. Olkha River, as well as in the near-surface aerosols in Shelekhov City. An estimation was performed for the level of contamination with PAH compounds in the area of the Shelekhov City within the framework of the MPC and background levels, a conclusion has been drawn concerning the distribution of PAH emissions from the source over a limited area. Among the isolated fractions of PAHs, using a gas chromatography-mass spectrometry technique there have been identified and determined 14 arenes including those from the list of priority organic pollutants.

Results of the investigation of cytotoxic and immunomodulating action of silver nanocomposites Ag15 (7.8 % Ag) and Ag13 (5 % Ag) with poly(1-vinyl-1,2,4-triazole) and platinum with arabinogalactan on primary and transformed human cells in vitro are presented. It is demonstrated that nanocomposites of metals with biopolymers possess more clearly pronounced cytotoxic effect in comparison with metal nanoparticles and do not induce inflammation in cell lines under investigation. It is established that silver nanocomposite Ag15 possesses selective cytotoxicity with respect to the cells of cervical adenocarcinoma HeLa.

Results are presented concerning the recovery of an oil sludge model from the contamination by means of a complex microbiological and physicochemical method. It is demonstrated that washing with a detergent composition results in a 55–75 % decrease of soil contamination level. The subsequent biodestruction by native microflora further reduces the contamination by 20–30 % per month. In the case of the mechanical part of the sludge, the microflora is worthwhile for stimulation by nitrogen and phosphorus containing mineral substrates, whereas in the case of spent water the mineral nutrition can be provided by the components of the composition. Changing the structural and group as well as the individual composition of hydrocarbons in the spent water corresponds to the initial stage of biodestruction, whereas that in the washed soil corresponds to the middle stage thereof, which indicates a low activity of the indigenous microflora.

The process of methane combustion in a fluidized bed of spherical oxide catalyst containing mixed copper and magnesium chromite on toughened alumina (IK–12–73) depending on the temperature and the concentration of methane in the mixture with air was studied. It has been demonstrated that the conversion level of methane oxidation into CO₂ in the case of the methane content equal to 2 % increases from 72 % at 500 °С to 99 % at 700 °С. Increasing the concentration of methane to 8 % does not causes reducing the conversion level of methane oxidation within the temperature range 600–750 °С. It has been demonstrated that the concentration of nitrogen oxides in the course of methane combustion at the temperature values ranging within 500–750 °С does not exceed 3.5 ppm. The presence of H₂ and CO in the reaction mixture does not causes increasing the conversion level of methane oxidation when the volume ratio CH₄/(CO + H₂) = 4 : 19.

Results of the investigation of cytotoxic and immunomodulating properties of gold nanoparticles of different sizes (12, 16, 22 and 35 nm) on primary and transformed cells in vitro are presented. Their localization and distribution in cells are studied. It is established that gold nanoparticles are not toxic within concentration range 0.06–6 μg/mL for all the cell cultures used, actively penetrate into the cell and get accumulated inside the vacuoles of different sizes, selectively activate the anti-inflammatory immune response depending on nanoparticle size and cell type.

In surface water and bottom sediments of the Gusinoye Lake (the Lake Baikal basin), there were concentration profiles determined for 19 polycyclic aromatic hydrocarbons (PAHs). It has been found that the total PAH content amounts to 7.1–33.7 ng/L for the surface water and 42.6–221.8 ng/g of dry solid matter for bottom sediments. It has been demonstrated that the presence of PAHs in the samples of surface water and bottom sediments of the Gusinoye Lake could mainly be caused by local sources having pyrolytic nature.

In the bottom sediments and surface water of the Gusinoye Lake (the Lake Baikal basin) there were content and profile values for organochlorine pesticides and polychlorinated biphenyls determined. An evaluation was performed concerning the ways of coming thereof in the Gusinoye Lake It has been found that the sources of these ecotoxicants are mainly local.

Experimental results are presented on studying the ionic mobility of metals in geotechnogenous solutions from an opencast mine of the Sherlovaya Gora tin-polymetallic deposit in the presence of zeolite-containing rocks taken from the Shivyrtuy deposit (Transbaikalia). A high sorption activity of zeolite-bearing rocks is revealed concerning almost all the metal ions in solution. Concentrating the large amounts of zinc, iron, manganese ions and other elements in the solid phase could be caused replacing the ions of sodium in the structure of clinoptilolite by the mentioned ions.

A topological thermodynamic analysis was performed for a butanol–toluene mixture produced as a waste in the industry of paint–and–lacquer materials. Liquid–liquid equilibrium was experimentally studied in the system ethanol–toluene–chlorobenzene–water. Main pathways for separating a butanol–toluene mixture have been synthesized as flow graphs. A rectification analysis was performed for the system under study. Choosing a separating agent (benzene) has been performed. Variants were proposed for the technological schemes of the butanol–toluene mixture separation via combining simple and azeotropic distillation techniques.

Enzymatic hydrolysis of technical cellulose of miscanthus in the acetate buffer with enzymatic preparation BrewZyme BGX was investigated. A linear dependence of the final concentration of reducing substances on the initial substrate concentration was established. The enzymatic hydrolysis of cellulose in aqueous medium with sequential addition of enzymatic preparations BrewZyme BGX, Celluxil, CelloLux-A was studied. The results of fermentation of the hydrolysates of Miscanthus technical cellulose obtained in the aqueous medium provide evidence of their sound quality, so these hydrolysates can be used for conversion into ethanol, gel film of bacterial cellulose and other products of microbiological transformation.