The strain Saccharomyces cerevisiae W303-1a, able to grow in a medium containing acetic acid as the sole carbon and energy source, was subjected to mutagenesis in order to obtain mutants deficient in monocarboxylate permeases. Two mutant clones exhibiting growth in ethanol, but unable to grow in a medium with acetic acid as the sole carbon and energy source, were isolated (mutants Ace12 and Ace8). In both mutan...
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