Thirteen isolates ofZymomonas were analyzed for their ability to tolerate increasing concentrations of glucose and ethanol. In medium containing 5.0% (v/v) ethanol, four isolates grew well in 15.0% (w/v) glucose. Six cultures tolerated at least 6,0% ethanol. Of all the isolates, 7 preferred glucose and 4 preferred sucrose as a sugar substrate. In a nutrient medium containing mineral salts and high concentrations of pantothenate and biotin ethanol production for 2 isolates was approximately 7.0%. Continuous stirring and growth factors were responsible for this increased ethanol production.
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Zajic et al. (1982) studied this question.
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