Concomitance of circadian and circa-4-hour ultradian rhythms in Euglena gracilis
Titel:
Concomitance of circadian and circa-4-hour ultradian rhythms in Euglena gracilis
Auteur:
Balzer, Ivonne Neuhaus-Steinmetz, U. Quentin, Edelgard van Wullen, M. Hardeland, R.
Verschenen in:
Biological rhythm research
Paginering:
Jaargang 20 (1989) nr. 1 pagina's 15-24
Jaar:
1989-02
Inhoud:
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.