Stationary cultures of Euglena were investigated in LD 12:12, LD 0.25:1.75, and in LL, at a temperature of 23 °C. In these conditions, protein synthesis, cell shape and/or phototaxis exhibited circadian rhythmicity, whereas tyrosine aminotransferase activity showed a circa‐4‐h periodicity. Simultaneous measurements of cell shape and tyrosine aminotransferase, carried out in LL, at either 27.5 or 18 °C, demonstrated concomitance of circadian and ultradian rhythms in the same cell cultures.
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Balzer et al. (1989) studied this question.
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