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E.coli (strain BL21DE3) were exposed to 900 MHz (CW and GSM) for 30 minutes at 0.5, 1, 2, or 4 W/kg and measured for membrane potential (flow cytometric analysis of DiOC6 incorporation and ATP content via bioluminescence assay ) as a determination of ATP synthetase activity. The authors report with 900 MHz CW exposure an increase in ATP content at 0.5 - 2 W/kg, but no increase vs sham at 4 W/kg, suggesting either a "window" effect or an adaptive response at higher exposure levels. Further, when the GSM modulated 900 MHz signal was used, ATP and membrane potential was also increased at the 4 W/kg level. In a subsequent study, E. coli exposed to 2450 MHz PW RF were reported to have significant alterations in membrane integrity (as measured by propidium iodide). |