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Acetaldehyde does not induce floc formation under anaerobic conditions. Shown are the turbidities of ZM4 cultures grown in a minimal anaerobic medium (ZYMM) with the indicated amount of acetaldehyde after gentle vortexing (5 s, level 3) (filled bars) and after harsh vortexing (10 pulses, level 10) to disperse any flocs (open bars). Shaded circles indicate the same culture pre- and postdispersion. Y, visual observation of flocs; N, no flocs observed.
