Abstract
Isolation from beer of a sucrose-fermenting species of Zymomonas confirmed as Z. mobilis, is recorded. Motility and H2S production were variable and sensitive to precise environmental conditions. The beer-spoilage potential of this species was established as limited. A strain of Z. anaerobia was isolated which acquired sucrose-fermenting ability after growth in fructose. It is doubtful, therefore, whether the creation of two distinct species within this genus is valid.
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