During the anaerobic fermentations, we collected OD values at
every time point and used the average value of each time interval
for the rate calculations. Xylose consumption rate (g xylose/ODH)
and ethanol production rate (g ethanol/ODH) were calculated
from the steepest slope of the curve using the average OD of that
time interval. Ethanol yield (g ethanol/g xylose) was calculated
using grams of xylose and ethanol directly measured at the initial
and
final time points.