http://hdl.handle.net/123456789/180 Fri, 15 May 2026 07:13:10 GMT 2026-05-15T07:13:10Z http://hdl.handle.net/123456789/20856 Title: Effect of light emitted by diodes on growth and pigment content of black currant plantlets in vitro Authors: Husak, Viktor; Lushcak, Volodymyr; Гусак, Віктор Васильович; Лущак, Володимир Іванович Abstract: The effects of cool white, natural white, and warm white lights, which have a continuous spectrum throughout the region of surfactant, and blue-red light spectrum on in vitro growth and development of black currant (Ribes nigrum L.) was studied. It was demonstrated that the spectral composition of light affected length and fresh mass of shoots and roots as well as concentrations of chlorophylls, carotenoids, and anthocyanins. The plants grown under warm white light had the longest shoots (2.5 ± 0.2 cm) and fresh mass of shoots (166 ± 12 mg) and roots (80 ± 16 mg) relatively to оne’s grown under other light types. Under blue-red and warm white lights black currant leaves possessed the highest concentrations of chlorophyll a (2.66 ± 0.31 and 2.17 ± 0.14 µmol·gwm-1, respectively), chlorophyll b (1.15 ± 0.15 and 0.87 ± 0.05 µmol·gwm-1), carotenoids (0.89 ± 0.09 and 0.78 ± 0.05 µmol·gwm-1, respectively) and anthocyanins (1.37 ± 0.20 and 1.09 ± 0.05 µmol·gwm-1, respectively). Thus, blue-red (B:R = 1:4) and warm white lights may be used as an alternative light source for upland black currant culture systems. Tue, 05 May 2020 00:00:00 GMT http://hdl.handle.net/123456789/20856 2020-05-05T00:00:00Z http://hdl.handle.net/123456789/20855 Title: Effect of Mn2+ substitution on catalytic properties of Fe3-xMnxO4 nanoparticles synthesized via co-precipitation method Authors: Danyliuk, Nazarii; Lapchuk, Ivanna; Kotsyubynsky, Volodymyr; Boychuk, Volodymyra; Husak, Viktor; Данилюк, Назарій Володимирович; Лапчук, Іванна Василівна; Коцюбинський, Володимир Олегович; Бойчук, Володимира Михайлівна; Гусак, Віктор Васильович Abstract: Mn-substituted magnetite samples Fe3-xMnxO4 (x = 0.0; 0.02; 0.05; 0.1; 0.15; 0.2; 0.25) were synthesized using the co-precipitation method. X-ray diffraction patterns confirmed the formation of pure, well-crystallized manganese ferrite with a cubic spinel structure. The crystallites size increases sharply for the minimum degrees of substitution, with a subsequent tendency to decrease with the growth of manganese ions content. The catalytic properties of Fe3-xMnxO4 were investigated for the degradation of oxytetracycline (ОТС) and inactivate E. coli. There is a correlation between particle size and catalytic activity. The Fe2.95Mn0.05O4 sample exhibited the highest catalytic activity in the destruction of OTC. The effect of electromagnetic heating (EMH) on the catalytic properties of iron oxides were investigated. The Fe2.9Mn0.1O4 sample with electromagnetic heating achieved 100 % efficiency in decomposing 5 mg/L of OTC. Fe3-xMnxO4 samples reduce the number of Gram-negative bacteria E. coli at concentrations of 104 and 106 CFU/mL. Electromagnetic heating experiments demonstrated high performance, achieving inactivation of 6 logs of E. coli in the presence of Fe2.98Mn0.02O4 and Fe2.95Mn0.05O4 catalysts within 135 minutes. Studies on ecotoxicity have shown that Daphnia magna is a sensitive bioindicator of residual H2O2 concentration. An increase in the Mn2+ content in the synthesized catalysts resulted in a decrease in the toxicity of purified water. The study suggests that Mn-substituted magnetite catalysts are effective materials for catalytic decomposition of OTC and inactivation of E. coli bacteria. Wed, 05 Jun 2024 00:00:00 GMT http://hdl.handle.net/123456789/20855 2024-06-05T00:00:00Z http://hdl.handle.net/123456789/20854 Title: Toxicity of water treated with Fenton-like ferrite catalyst Authors: Danyliuk, Nazarii; Lapchuk, Ivanna; Husak, Viktor; Данилюк, Назарій Володимирович; Ларчук, Іванна Василівна; Гусак, Віктор Васильович Abstract: Recently, there has been a rapid growth in the use of nanoparticles in water treatment processes. However, an important task is to study the toxicity of the materials used and the reaction products formed. The purpose of this study was to evaluate the impact of the proposed water treatment method on the ecosystem. Algae are excellent model organisms for studying the toxic effects of catalyst nanoparticles. This work investigates the toxicity of cobalt ferrite (CoFe2O4) and hydrogen peroxide (H2O2) on the microalgae Chlorella vulgaris Beij. (C. vulgaris). The growth rate of C. vulgaris depends on the residual concentration of H2O2, indicating a stressful physiological state of the microalgae. Exposure to sintered cobalt ferrite granules does not affect the growth of freshwater algae. At a residual H2O2concentration of 11.9 mM, algal cells' morphology, membrane integrity, and viability were severely impaired. Hydrogen peroxide is known to cause oxidative stress, as evidenced by a decrease in the growth rate of C. vulgaris and an increase in the number of dead cells. The study showed that the high residual concentration of H2O2is the main obstacle to the discharge of treated water into the natural ecosystem. © 2024 Precarpathian National University. All rights reserved. Wed, 05 Jun 2024 00:00:00 GMT http://hdl.handle.net/123456789/20854 2024-06-05T00:00:00Z http://hdl.handle.net/123456789/20853 Title: Pesticide toxicity: A mechanistic approach Authors: Husak, Viktor; Lushcak, Volodymyr; Гусак, Віктор Васильович; Лущак, Володимир Іванович Abstract: Pesticides are known for their high persistence and pervasiveness in the environment, and along with products of their biotransformation, they may remain in and interact with the environment and living organisms in multiple ways, according to their nature and chemical structure, dose and targets. In this review, the classifications of pesticides based on their nature, use, physical state, pathophysiological effects, and sources are discussed. The effects of these xenobiotics on the environment, their biotransformation in terms of bioaccumulation are highlighted with special focus on the molecular mechanisms deciphered to date. Basing on targeted organisms, most pesticides are classified as herbicides, fungicides, and insecticides. Herbicides are known as growth regulators, seedling growth inhibitors, photosynthesis inhibitors, inhibitors of amino acid and lipid biosynthesis, cell membrane disrupters, and pigment biosynthesis inhibitors, whereas fungicides include inhibitors of ergosterol biosynthesis, protein biosynthesis, and mitochondrial respiration. Insecticides mainly affect nerves and muscle, growth and development, and energy production. Studying the impact of pesticides and other related chemicals is of great interest to animal and human health risk assessment processes since potentially everyone can be exposed to these compounds which may cause many diseases, including metabolic syndrome, malnutrition, atherosclerosis, inflammation, pathogen invasion, nerve injury, and susceptibility to infectious diseases. Future studies should be directed to investigate influence of long term effects of low pesticide doses and to minimize or eliminate influence of pesticides on non-target living organisms, produce more specific pesticides and using modern technologies to decrease contamination of food and other goods by pesticides. Wed, 18 Jul 2018 00:00:00 GMT http://hdl.handle.net/123456789/20853 2018-07-18T00:00:00Z