Abstract
The unicellular organism, Euglena gracilis, exhibits a self-sustained circadian rhythm in dark mobility with a maximum at the middle of the physiological day. In the cell suspensions that do not show any further cell division the rhythm persists up to three months. It is damped out under continuous bright light and reinduced by a single transition from light to darkness. In young mixotrophic cultures, that is, in a medium containing peptone and citrate, the length of the free-running period of the circadian rhythm increases slightly with higher temperatures. A rapid temperature step does not disturb the phase. In contrast to this type, in older autotrophic cultures, the period is constant at all temperatures within the physiological range, but a rapid increase in temperature shifts the circadian phase. The extent of this shift depends only on the phase angle at which the temperature step has been applied. This type is defined as phase-sensitive.
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