Concomitance of circadian and circa‐4‐hour ultradian rhythms inEuglena gracilis
- 1 February 1989
- journal article
- research article
- Published by Taylor & Francis in Journal of Interdisiplinary Cycle Research
- Vol. 20 (1) , 15-24
- https://doi.org/10.1080/09291018909359994
Abstract
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.Keywords
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