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Time course of glycerol/glucose co-fermentation and propionic acid production by P. acidipropionici. Biomass (closed triangle), glucose (open circle), glycerol (closed circle), propionic acid (closed square), succinic acid (open triangle), and acetic acid (open square); pH 6.5 controlled by NaOH addition; error bars data range about mean (n ≥ 2)
