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Background and Aim: Dielectric Barrier Discharge (DBD) cold plasma has efficient antibacterial activity on bacterial contamination at a short period of time and confirms its potential for routine used in clinical environment biodecontamination as an alternative to conventional disinfectant methods of water treatment. The goal of this study is to evaluated in vitro effectiveness of DBD cold plasma on clinically important opportunistic pathogens that identified from water samples which were: Legionella E.meningosepteca and S. paucimobilis growth and to study DBD effectiveness on survival bacterial cell after treatment. Methodology: 100-200 cfu/ml of Seven different environmental bacterial isolates belong to Legionella (4 isolates) E.meningosepteca(one isolate) and S. paucimobilis (two isolates) at species were subjected to eleven different exposure time of DBD cold plasma treatment rang from 15Sec to 300 Sec, and plated on suitable agar media. Results were quantified by viable count.

In this paper the effect of nonthermal atmospheric argon plasma on the optical properties of the cadmium oxide CdO thin films prepared by chemical spray pyrolysis was studied. The prepared films were exposed to different time intervals (0, 5, 10, 15, 20) min. For every sample, the transmittance, Absorbance, absorption coefficient, energy gap, extinction coefficient and dielectric constant were studied. It is found that the transmittance and the energy gap increased with exposure time, and absorption. Absorption coefficient, extinction coefficient, dielectric constant decreased with time of exposure to the argon plasma

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Undoped ZnO and Cd doped ZnO thin films were deposited utilizing chemical spray pyrolysis. The effects of non-thermal plasma on the structural and optical properties were studied. XRD patterns indicate that all the deposited films were polycrystalline hexagonal structure, but the preferred orientation of un doped ZnO was (002), while for doped samples were orientated along (101). The effect of plasma exposure on crystal size, transmittance, absorption edge and optical energy gap were investigated. Results illustrate that the crystal size, transmittance and optical energy gap were decreased when doped samples exposure to plasma.