title: [Periodic macromolecule syntheses in synchronized cultures of species belonging to the "Rhodococcus" genus ("Rhodochrous" group) (author's transl)].
abstract: The synthesis of total proteins, total RNA and DNA in exponential synchronous cultures of species belonging to the Rhodococcus genus (Nocardia restricta and N. canicruria) has been studied by chemical methods and pulsed incorporations of labelled precursors in the acid-insoluble fraction. The replication of DNA is discontinuous. Syntheses of RNA and proteins are periodic: they happen during two main periods during the time necessary for a doubling of the cell mass. A slowdown of these syntheses occurs during the DNA replication. This periodicity allows to explain the regular discontinuities previously observed on the absorbance curves of synchronous cultures. The discontinuous pattern in the macromolecules synthesis of Rhodococcus allows a comparison with the cell cycle of some lower eukaryotes but is different from the cycle of fast-growing bacteria.
mesh_terms: D001426:Bacterial Proteins / Q000096:biosynthesis*; D002453:Cell Cycle; D004261:DNA Replication; D004269:DNA, Bacterial / Q000096:biosynthesis*; D009615:Nocardia / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism; D010507:Periodicity; D012329:RNA, Bacterial / Q000096:biosynthesis*
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D012329:RNA, Bacterial
vernacular_title: Synthèses périodiques des macromolécules dans le cultures synchrones d'espèces du genre Rhodococcus (groupe "Rhodochrous").