Interaction of Co<sub>3</sub>O<sub>4 </sub>cobalt oxide ultrafine particles with oregano herb extract <i>Origanum vulgare</i>
Prospects of phytobiotics and ultrafine materials applying in livestock feeding are presented. The biological activity of Co<sub>3</sub>O<sub>4</sub> ultrafine particles (UFP) and Origanum vulgare extract was evaluated in the bacterial luminescence inhibition test individually and in combination. The results obtained[3] indicate high bactericidal properties of UFP (EC<sub>50</sub> at 9.8×10<sup>-4</sup> mol/L) and plant extract. It was shown that the applying of these substances in the combination neutralizes the negative effect. The doses recommended for the in situ study were established (from 7.6×10<sup>-6</sup> to 6.1×10<sup>-5</sup> mol/L for UFP, 64-fold dilution for the extract).