Abstract
A STRAIN of Pseudomonas aeruginosa (Bact. pyocyaneum), isolated from a milk factory effluent, was found to be affected by daylight in two different ways. In the first place, the formation of pyocyanin in young cultures was diminished in daylight. Cultures on a glycerol-peptone agar1, grown at room temperature in the dark, developed an intense blue colour in two weeks (Ridgway's Dark Delft Blue2), while parallel cultures in a north window showed a transient green colour (Russian Green) one week after inoculation but had faded to a dirty green-brown by the second week. Growth was apparently equally good in both sets of cultures.
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Turfitt, G. E., Biochem. J., 30, 1323'8 (1936).
Ridgway, R., ‘Color Standards’ (Washington, B.C. (1912)).
Sullivan, M. X., J. Med. Res., 14, 109'60 (1905).
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MEIKLEJOHN, J. A Light-sensitive Strain of Pseudomonas aeruginosa. Nature 144, 908 (1939). https://doi.org/10.1038/144908b0
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DOI: https://doi.org/10.1038/144908b0
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