The thermophilic bacterium Bacillus slearolhermophilus (ATCC 7954, NCA 1503, NCIB 8924) has been shown to produce high levels of the enzyme alcohol dehydrogenase,l.z amounting to 1-254 of the soluble cell protein when grown in complex media3 containing sucrose. This enzyme is also produced in continuous culture.' Alcohol dehydrogenase (AIlH) is known to be responsible for the t,erminal step in the formation of alcohol by yeasts, and, in the course of investigat,ions of H . stearothermophilus as a source of thermostable proteins,5 we briefly examined it.s ability t o produce alcohol under anaerobic conditions at high temperatures and the possibility of removing any alcohol so produced by stripping with an inert gas. This study reports alcohol production by h ' . stearothermophilus
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