Co-culture population dynamics with diffusive oxygen transfer. Population dynamics for 50 mL, 25 g/L α-cellulose co-culture fermentations without added oxygen (A) and with added oxygen (B) and 500 mL, 100 g/L α-cellulose co-culture fermentation (C). Results in A and B are representative of at least 3 independent experiments. Results in C represent a single experiment. Error bars are plus and minus one standard deviation among the drops used for colony counting.