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Comparison of the growth, sugar consumption and production of solvents (butanol and acetone) and butyrate between the 824ccpA (Square) and 824WT (triangle) strains when fermentingd-glucose andd-xylose with pH control. pH value was kept over 5.0 by using 9% (w/v) aqueous ammonia. Samples (indicated by arrows) for microarray analysis were collected in four time points: middle (M) and late (L)-exponential growth phase; transition phase (T) and stationary phase (S).
