Circadian rhythm of cell division in Euglena: effects of random illumination regimen.
A persisting, "free-running," circadian rhythm of cell division in autotrophically grown Euglena gracilis is obtained upon placing either an exponentially increasing population or a culture that has been synchronized by a 10:14 light-dark cycle in a random illumination regimen that affords a total of 8 hours of light each 24 hours. These results are interpreted as implicating an endogenous biological clock which "gates" the specific event of cell division in the cell developmental cycle.
D002455:Cell Division; D002940:Circadian Rhythm; D005055:Euglena; D008029:Lighting; D013997:Time Factors