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Journal of Cell Science, Vol 95, Issue 2 321-328, Copyright © 1990 by Company of Biologists

JOURNAL ARTICLES

The circadian bioluminescence rhythm of Gonyaulax is related to daily variations in the number of light-emitting organelles

L Fritz, D Morse and JW Hastings
Biological Laboratories, Harvard University, Cambridge, MA 02138.

The number of scintillons, which are cellular organelles responsible for light emission in the marine alga Gonyaulax, were counted by both immunofluorescence and electron microscopic methods and found to vary tenfold between subjective day and subjective night. The number of scintillons peaks during the subjective night, as does stimulated bioluminescence (flashing). Furthermore, the number drops sharply at the time of the maximal spontaneous bioluminescence (glow), which occurs at the end of the night phase, suggesting that the breakdown of scintillons may be responsible for this mode of emission.


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© The Company of Biologists Ltd 1990