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Viability of E. coli cells versus time, as a result of reactions with 900-ppb and 0-ppb silver ion solutions. Viable cells were enumerated on an agar plate containing 1 g/liter glucose, 2.5 g/liter yeast extract, and 5 g/liter tryptone by the colony count method, after incubation at 35°C for 24 h.
