We used two types of atmospheric-pressure plasma generators. One of them was used for sterilization
(disinfection) of liquid media, another for processing of surfaces. Effective generation of biochemically
active species (O, OH, etc.) inside a liquid is of great interest for many scientific and practical applications
(water purification, biomedical applications, etc). In many cases, short-pulsed discharges forming
streamers in the bulk of liquid or in gas above the liquid surface are used to do that [8–13]. Another
promising approach allowing us to generate a lot of radicals in liquid is an electric discharge in the water
filled with chaotically moving gas bubbles [14–17]. In such cases, active species are produced by cold
plasma generated inside small bubbles (but not in a liquid itself), and after that they are transported due
to diffusion from bubbles into the liquid.