The ability of some α-haemolytic micrococci described by Clausen (1964) to form lactic acid from glucose has been determined by means of ‘resting’ bacterial cells. The total quantity of lactic acid was measured in each individual test. Reference organisms used were a strain of , 2 enterococcus strains, and 1 strain of . Glucose conversion was found to be in large measure dependent upon the concentration of active bacterial cells in the suspension. All the α-haemolytic micrococcus strains tested, together with the reference strains, proved to be homofermentative or near homofermentative formers of lactic acid, provided that the number of active organisms was brought to a sufficiently high level in the suspension when converting the glucose.


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