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Written Paper

Microbiological activity and prooxidant effects of Eisenia fetida Savygni, 1826, under tungsten nanoparticles incorporation in the soil  [2018]

Lebedev, S.V. Gavrish, I.A. Sizova, E.A. Yausheva, E.V., Federal Scientific Center for Biological Systems and Agrotechnologies, Orenburg (Russian Federation)

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The influence of increasing concentrations of tungsten nanoparticles (10, 30, 90 and 120 mg/kg of dry matter) in artificial soil on the adaptive capacity of worms, microbiocoenosis of intestinal worms and soil before and after vermicultivation for 28 days are studied. Tungsten (W) nanoparticles of 50.7±0.3 nM were used, and the Z potential was of 30.00±0.26 mV. A preliminary analysis of the biological activity of W nanoparticles in vitro was carried out in the inhibition test of bacterial bioluminescence. The EC50 toxicological parameter values indicated a high toxicity of W nanoparticles at low dosages with prolonged contact (0.05 M after 170 min., 0.0125 M after 180 min.). The introduction of similar doses of W nanoparticles into the substrate was accompanied by an increase in the biomass of the worm at doses of 30-120 mg/kg. The level of adaptation of the organism Eisenia fetida was expressed in the growth of activity of superoxidedismutase and decrease in the level of catalase depending on the dose load. The protein level increased throughout the range of dosages tested. At application of W nanoparticles in a dosage from 10 to 120 mg/kg bactericidal effect is fixed, in particular, decrease of soil microflora by 44.50-82.25%, intestinal microflora Eisenia fetida by 25.8-54.2%. In this regard, W nanoparticles act in the primary phase as the catalyst for biochemical processes in the body of the worm, whereas as the W concentration increases, the bacterici
dal effect increases.

From the journal

Agrochem Herald

ISSN : 0235-2516