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An ultradian clock operates in fast growing cells of the large ciliate, Paramecium tetraurelia. The period of around 70 minutes is well temperature-compensated over the temperature range tested, i.e. between 18 degrees C and 33 degrees C. The Q10 between 18 degrees C and 27 degrees C is 1.08; above 27 degrees C there is a slight overcompensation. The… (More)
Both a circadian clock and an ultradian clock (period 4-5 h) have previously been described for the ciliated protozoon Tetrahymena. The present communication demonstrates the existence of yet another cellular clock: an ultradian rhythm with a period of about 30 min. The period was found to be well temperature-compensated over the range studied, i.e.,… (More)