141. A Pigment-producing Organism (Pseudomonassp.) Isolated From Discoloured Butter

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Abstract
An organism, isolated from discoloured areas in butter and capable of reproducing the colour in artificial culture, is described.A brown colour, which may probably be attributed to the action of ammonia produced by this organism, diffused through the medium.A blue-black insoluble pigment, produced only at low temperatures, was concentrated in and around the bacterial cells. The nature of the source of nitrogen influenced the development of this pigment, proteose appearing to be inhibitory.NaCl in moderate concentration was usually necessary for growth.

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