[Effect of Selenium-Containing Biocomposites Based on Ganoderma Mushroom Isolates Grown in the Presence of Oxopropyl-4-Hydroxycoumarins, on Bacterial Phytopathogens].

Effect of selenium-containing biocomposites obtained from submerged cultures of macrobasidiomycetes Ganoderma applantum, G. cattienensis, G. colossus G. lucidum, G. neojaponicum, and G. valesiacum, on plant pathogenic bacteria Clavibacter michiganensis ssp. sepedonicus (Cms), Micrococcus luteus, Pectobacterium atrosepticum, Pectobacterium carotovorum subsp. carotovorum, Pseudomonas fluorescens, Pseudomonas viridiflava, and Xanthomonas campestris was studied. Oxopropyl-4-hydroxychromenones were used as components of the fungal nutrient media. The bacteriostatic and bactericidal activity of the Se-containing and Sefree substances of fungal origin against plant pathogenic bacteria was determined using colony-forming units count, the agar well diffusion method, and by turbidity measurements of bacterial suspensions. The composites produced from the extracellular metabolites of G. cattienensis SIE1302 with 4-hydroxy-3-(3-oxo-1,3- diphenyl propyl)-chromen-2-one (S(45)), and of G. lucidum SIE1303 with 4-hydroxy-3-(3-oxo-1-(3-nitrophenyl)- 3-phenylpropyl)-chromen-2-one (S(NO2)) possessed the most pronounced antibacterial action against Cms. The composites produced from the isolates of G. valesiacum 120702 with S(NO2) showed the maximal antibacterial activity against Xanthomonas campestris B-610. High antimicrobial effect of G. lucidum 1315 with S(NO2) against Xanthomonas campestris B-610 and of G. colossus SIE1301 against Pseudomonas fluorescens EL-2.1 was revealed. The pioneering information on the biological activity of coumarin series compounds in their application for producing the substances of fungal origin was obtained.

[Effect of a low concentration of hydrogen peroxide on metabolism of blood cells]. / Vliianie nizkoi kontsentratsii perekisi vodoroda na metabolizm kletok krovi.

Hydrogen peroxide is known to posses a wide range of physiological effects towards functional activity of cells. We have investigated the influence of H2O2 on the activity of glycolys in the native blood cells. Adding of hydrogen peroxide up to final concentration 50 microM led to decrease of activity some glycolytic enzymes. H2O2 inhibited consumption of glucose by blood cells. Despite the fact that H2O2 is well known as prooxidant, we observed decrease of the level of thiobarbituric acid reactive species in the blood cells after their incubation in the presence of hydrogen peroxide for 2 hours. Based on these data we supposed that effects of hydrogene peroxide occur via signal transduction pathways.