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Growth curves for S. lithotrophicum (a) and C. mediatlanticus (d) cultured under nitrate-reducing conditions. Expression of the luxS gene (filled symbols) and induction of bioluminescence (open symbols) in S. lithotrophicum (b, c) and C. mediatlanticus (e, f). Exponential (E), stationary (S) and death (D) growth phases are labeled within each graph. All experiments were carried out in triplicates.
