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Photobacterium
phosphoreum (Vibrio phosphoreum) is another type of marine bacteria.
1-7 day old colonies grown at 20 degrees Celcius, exhibit extremely
bright luminescence. Petri-plate cultures or flasks can even be used
as torches or reading lights in total darkness. After a couple of
weeks on sea water yeast-peptone agar, the light decreases and tends to
remain bright around the growing edges of colonies.
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