Bacteria Inactivation Using Post-discharge Plasma in Atmospheric Pressure CO$_{2}$ and N$_{2}$-O$_{2}$

Recently, the plasma physics scientific community has paid much attention to the development of atmospheric-pressure, non-thermal plasma sources. Dielectric barrier discharge can generate a cold plasma over a wide atmospheric pressure range. We study DBD plasma source that can be employed for the treatment of dangerous bacteria. The CO$_{2}$ and N$_{2}$-O$_{2}$ post-discharge plasmas are produced with conical electrodes operating at 50Hz. Antibacterial effect of post-discharge plasma were used on cultured bacteria in Luria Bertini (LB) with concentrations of OD$_{600}$nm=0.25 McFarland standard and 7.75$\times $10$^{5}$ colonies per LB media plate prepared for surface sterilization. The sterilizing application experiments showed that such a cold plasma was very effective in the disruption of \textit{S. pyogenes}. Therefore, this type of plasma is suitable for various applications, especially, biology and medicine.