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Effect on extracellular pH elicited by addition of fructose (F) or xylitol (X) to final concentration of 10 mM to unbuffered aqueous cell suspensions of Z. rouxii CBS 732 grown in YNB medium with 0.5% fructose (A), 0.05% fructose (B), 0.1% fructose (C and D), 2% mannitol (E and F). The arrows indicate the times of fructose/xylitol addition. Data are representative of at least two independent experiments.
