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E. coli cultures were grown on LB agar (Difco, Sparks,
MD) for 2 days at 37 ¡ãC prior to experimentation. Cells were
subsequently transferred from the plate under sterile conditions
to 250 mL of phosphate buffer solution (PBS, pH 7.0).
Thesolutionwasserially diluted to the required concentration
range. Five milliliters of the solution was filtered in triplicate
for each dilution onto presterilized filter membranes (0.45-
¨ªm mixed cellulose esters, 47-mm diameter (Millipore,
Pittsburgh, PA)). Following filtration, the membranes were
placed on sterile 10-mL Petri dishes containing 9 mL of LB
agar. The Petri dishes with the filter membranes in place on
the LB agar were exposed to the afterglow plume emitted
from the grounded hollow slot electrode for the required
time. After the plasma treatment, the Petri dishes were
incubated at 37 ¡ãCfor 1 day prior to determining the resulting
number of colony forming units (CFU).
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