ABSTRACT.
The study examines the effect of toxicity of biosynthesized cobalt oxide nanoparticles depending on
their concentration and the reducing agent (plant extract) used in the synthesis on various types of bacteria: Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Salmonella enterica. The greatest antibacterial effect is
expressed against P. aeruginosa is shown.
KEYWORDS: cobalt oxide, nanoparticles, green synthesis, microorganisms, antibacterial effect, toxic effect.
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