[Low temperature spectral study on Euglena gracilis Z during synchronous culture on lactate medium: Variation of cytochrome 556 content].

Low temperature spectra are described for whole Euglena cells. Euglena growing in synchronous culture with lactate medium show a cyclic variation of cytochrome 556 content during each cellular generation. The greatest quantity of cytochrome 556 seems to coincide with the non-dividing phase of the cells, the phase in which the mitochondrial network is observed. On the other hand after treatment of the Euglena with antimycin A, a correlation exists between the formation of giant mitochondria and an increase in the quantity of cytochrome 556.These results demonstrate the existence of a cyclic variation of cytochrome 556 synthesis in Euglena during synchronous growth on lactate medium.