Abstract

The flagellate, Euglena gracilis , which can be cultivated under autotrophic or heterotrophic conditions has been synchronized using light-dark cycles and temperature changes, respectively. Synchronization of autotrophic Euglena cells by light-dark changes was found to be optimal. The kinetics of population growth and synchrony as well as the content of DNA were determined with an impulse cytophotometer. The results suggest that both synchronized Euglena cultures and the method used are suitable for their application as a standardized simple biological test system.

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