Abstract
The ability of strains of 40 mesophilic species of bacteria to hydrolyze five different starches was studied. These species are either not described in Bergey's Manual as to their action on starch or they are listed as "not hydrolyzing starch". Strains of 32 species were amylolytic, six species were not. Strains of two species failed to grow. Of the amylolytic species, 22 attacked all five starches, two attacked four, six hydrolyzed two, and two species hydrolyzed only one starch. No single starch was hydrolyzed by all strains of 32 amylolytic species. Rice and soluble starch were most readily hydrolyzed. Potato and corn starch offered the greatest resistance at first. Arrowroot starch held an intermediate position. Two weeks of incubation seemed to be a minimum period. The longer the cultures were incubated the more completely was a particular starch hydrolyzed and the more numerous were the amylolytic cultures. The implications of these observations for determinative work are discussed.
Published Version
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