The Effect of Streptococcus Lactis and Coliform Organisms on the Soluble Nitrogen of Milk

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Summary S. lactis organisms caused a rapid increase in soluble nitrogen during the first day or two, followed by a small and gradual increase which continued for at least 15 days. When E. coli and A. aerogenes were grown alone they caused a deficit in soluble nitrogen during the first few days of growth. This deficit was overcome later, and these organisms caused marked increases in soluble nitrogen between 7 and 15 days. Mixed cultures containing S. lactis and coliform organisms caused gradual increases in soluble nitrogen, increases which were somewhat between the results of the component organisms, except that the soluble nitrogen values at 15 days never were as high as those for the coliform organisms alone and were of about the same magnitude as those for S. lactis .