Izvestiya of Saratov University.
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)


Dynamics of formation of tolerance to blue (405 nm) led radiation in Staphylococcus aureus upon repeated exposure

In this work, we studied the development of tolerance to low-intensity violet (405 nm, 80 mW/cm2 , 72 J/cm2 ) LED radiation in a clinical antibiotic-resistant strain of Staphylococcus aureus 2a. The change in numbers during 20 cycles of irradiation was studied, the reaction of bacterial cells to oxidative stress was studied – sensitivity to the presence of hydrogen peroxide in the environment and catalase activity.

мChange of Ecological and Biological Properties of Light Brown Soils of Kalmykia at Oil Pollution

Change of ecological and biological properties of light brown soils of Kalmykia at oil pollution is investigated. Negative influence of oil pollution on biological properties of light brown soils is studied. Influence of oil pollution on body height and development of plants is studied. Oil negatively influences such indicators of plants as the root length, the stalk length, the quantity of the sprouted plants, they decrease. It is proved that oil pollution of the light brown soil leads to change of physical and chemical properties of soils.