Circadian rhythm of the transcellular current in regenerating enucleated posterior stalk segments of Acetabularia mediterranea

Kinetics in metabolic control of time measurement in photoperiodism

“…The integration of the different sequences of energy transduction could thus be effected by modulation of enzymic activity through cofactor ratios , ionic balances (Bygrave, 1967;Blair, 1970), substrate availability and/or endproduct feed-back which could result in a circadian rhythm in proton flow (e.g. Mitchell, 1976) as suggested by a circadian rhythm in transcellular current in Acetabularia (Novak and Sironval, 1976). …”

Circadian Rhythms

“…When Acetabularia cells are bisected, the posterior part containing the nucleus will regenerate a new tip. In this segment, a transcellular Current flowing toward the regenerating end can be detected even if the nucleus is subsequently removed [58]. The magnitude of this current varies rhythmically with a period of about 24h.…”

Les rythmes des mouvements cytoplasmiques et de l'activité électrique chezAcetabularia: effets de la lumière et mise en évidence d'un comportement corrélé

“…Ces rythmes sont endogènes et leur période est voisine de 24 heures (Novak et Sironval, 1976;Broda et coll., 1979;Dazy et coll., 1980;Broda et Schweiger, 1981).…”