) Fermentation activity test at 40℃ YPD screening medium containing 1% yeast extract, 2% polypeptone and 2% glucose was used. Each of the isolated strains was grown on YM agar (24 − 48 h at 25℃) and then inoculated into 5 mL of YPD screening medium in a test tube containing a Durham tube and incubated at 40℃ for 5 days. The yeast fermentation activity was scored by the accumulation of gas in the Durham tubes. Strains fermenting glucose and produc- ing gas in the Durham tubes within 24 h were selected for further tests.