[Comparison of specific synthesis of RNA in synchronized Euglena gracilis (Z) grown on lactate medium in the dark and in the light, and a study of the mitochondria].
Synchronization of Euglena gracilis (Z) on lactate medium is shown to be independent of illumination. The existence of a mitochondrial cycle in lightgrown as well as in dark-grown Euglena is demonstrated. When RNA synthesis is studied by pulse labeling with tritiated uracil in synchronously growing cells, a discontinuous RNA synthesis is found. Two peaks of preferential RNA synthesis in dark-grown cells and three peaks in light-grown cells are seen; the significance of the third peak of RNA synthesis in light-grown Euglena is discussed.
Laboratoire de Cytophysiologie de la Photosynthèse, C.N.R.S., Gif-sur-Yvette, France.
G
G
Ledoigt
R
R
Calvayrac
A M
AM
Orcival-Lafont
B
B
Pineau