Abstract
In 1936 Mr. H. Bouman isolated a new pseudomonad strain which attracted attention by the production of a golden-yellow color on certain solid media, and by the formation of pigment crystals within its colonies. The organism has now been described in detail and given the name Pseudomonas aureofaciens. It has been shown that P. aureofaciens produces more than one pigment in varying proportions depending on the composition of the medium used and on external conditions. Two of these pigments were isolated and both proved to be phenazine derivatives. One pigment was identified as phenazine alpha-carboxylic acid. The second pigment apparently is a closely related compound, but its configuration still awaits elucidation.

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