Marine luminous bacteria produce light in the luciferase catalyzed reaction with reduced flavin mononucleotide (FMNH2), molecular oxygen (O2) and a long-chain aliphatic aldehyde.' Some species alter the color of bioluminescence (BL), in which an endogenous fluorescent protein participates as a secondary emitter. Vibrio fischeri strain Yl in the logarithmic phase emits the yellow BL peaking around 540 nm that is shifted by about 50 nm from the normal blue-green light arising from the luciferase reaction {X^n ~ 490 nm).
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