Circadian communication between unicells? |
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Authors: | Hellmuth Broda Doug Brugge Keiichi Homma J Woodland Hastings |
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Institution: | (1) Department of Cellular and Developmental Biology, The Biological Laboratories, Harvard University, 02138 Cambridge, MA, USA;(2) Present address: Ciba-Geigy AG, Basel, Switzerland |
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Abstract: | Populations ofGonyaulax polyedra, in two different phases, about 11 h apart, were mixed, and the intensity of their spontaneous bioluminescence glow recorded
for about 2 wk under conditions of constant dim (35±3 μE/m2/s) white light and constant temperature (19.0±0.3°C). The phases and amplitudes of glow signals recorded from mixed cultures
were compared with those obtained from the arithmetic sum of the intensity data from two control vials. Peaks in control cultures
generally remained separate, but there was a spontaneous increase in the period beginning 6–11 d after the onset of constant
conditions. This did not occur in cultures in which the medium was exchanged with fresh medium every 2 d. In the actual mixes
of two cultures there was a merging of the two subpeaks in the signal, which did not occur when the medium was exchanged.
The results indicate that conditioning of the medium by cells may affect the period of the circadian rhythm and that this
might result in a type of communication.
Supported by the Deutsche Forschungsgemeinschaft; present address |
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Keywords: | Gonyaulax polyedra circadian communication between unicells cell-conditioning of medium effects on period bioluminescence cell communication circadian rhythms |
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