Improved R strain of Candida shehatae was able to ferment both pentoses and hexoses derived from hemicellulose simultaneously. Large inoculum(8 g/L or higher)and high xylose concentration (20% of total sugar or higher) eliminated the catabolite repression caused by more-favored hexoses. More than 90% of sugar was utilized and 0. 43-0.48g ethanol/g consumed sugar was produced at 30-40℃ with limited oxygen supply. Anaerobic fermentation resulted in incomplete xylose utilization and xylitol accumulation, while...