[Low temperature spectral study on Euglena gracilis Z during synchronous culture on lactate medium: Variation of cytochrome 556 content]. / Etude spectrale à basse temperature chez Euglena gracilis Z en culture synchrone sur milieu lactate: Variation de teneur en cytochrome 556.

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.