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Summary form only given. We have carried out electrical, chemical, optical, and biological studies on both He and atmospheric air plasma. A microwave absorption method was used for average electron density measurements. The ion measurements were done by collecting the ion current over an interval in time in a capacitor, and measuring the collected charge with a nanometer after the discharge was turned off. This method prevents RF noise from the discharge from jamming the nanometer. The measurements indicated that an ion density of 10/sup 12/ ions per cubic centimeter was present in the discharge. The results of both He and atmospheric air plasma show that the overwhelming production was of ozone. A trace of NO was found. The analysis of optical characteristics shows that the far ultraviolet light production was negligible as compared to that of a 150 Watt mercury arc in a quartz tube. Biological studies have been carried out with samples of XL-1Blue/sup TM/, E. coli and attained promising results.