Synchronous cultures of the unicellular alga Chlamydomonas reinhardii established by repetitive light and dark cycles displayed both ultradian and circadian rhythms in chlorophyll a levels. The ultradian oscillation had a period of approximately 55 min and appeared superimposed upon the circadian rhythm. These data support the theory that the ultradian oscillator may be a common element in both circadian and cell cycle timing.
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Jenkins et al. (1989) studied this question.
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