A Comparative Study of Cellulose-Producing Cultures and Celluloseless Mutants of certain Acetobacter Spp.

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Abstract
Comparative studies with 2 strains of A. acetigenum (NCIB 8132, NCIB 5346), one strain of A. xylinum var. africanum (NCIB 7029) and 26 celluloseless mutants obtained from the 2 parent cultures showed a loss of ability to produce a cellulose pellicle and other consistent differences between the parent and mutant cultures. The parent cultures oxidized ethanol to acetic acid; this reaction was not observed with mutant organisms. The mutants showed optimum growth in alkaline media, growth in glucose-yeast-extract medium in the presence of 10-12% (v/v) ethanol, proteolytic activity, growth at 40[degree], and growth in yeast-extract medium; these abilities were not shown by the wild-type cultures. Variations in colony form, nutritional requirements, the ability to produce acid from certain sugars and to oxidize glycerol appeared to occur at random among the mutant cultures.

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