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(a) Measurement of As(V) concentrations in G. lovleyi cell suspensions provided 5 mℳ As(V). (•) Resting cells with acetate (20 mℳ) added as an electron donor; (▪) Heat-killed control cells; and (○) Resting cells without acetate. (b) Transcription levels of G. lovleyi arrA gene, normalized against G. lovleyi recA, in cells grown with either fumarate or fumarate and As(V) as potential electron acceptors.
