occidentalis a-amylase gene (AMY),
singly or in combination, integrated into their chromosomes.
The strain expressing both GA1 and AMY
generated 10.3% (v/v) ethanol (80.9 g l-1) from 20%
(w/v) raw corn starch after 6 days of fermentation, and
decreased the raw starch content to 21% of the initial
concentration.