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Contribution of carbonate ion to S. gordonii AI-2 production. Time courses of culture densities (A) and AI-2 induction levels (B) of wild-type S. gordonii grown in BHI medium (circles) or BHI medium supplemented with 24 mM MOPS (squares), 24 mM Na2CO3 (triangles), and 24 mM NaHCO3 (diamonds). All time course experiments were repeated at least six times, and the averages of three representative independent experiments with standard deviations are shown (B). KU, Klett units.
