title: [Ultrastructural changes in the nucleus and the nucleolus of Euglena gracilis Z during the cell cycle].
abstract: The chromosomes and nucleolus of the Euglenineae remain visible in electron microscopy throughout the cell cycle. This peculiarity allowed to show cyclic variations of the nucleus structure in synchronized cells of Euglena gracilis Z: I. different stages of chromosome condensation was observed; 2. ultrastructural modifications in the organization of the nucleolus were evidenced, characterized by its apparent continuity ("open appearence") or discontinuity ("closed appearance") with the nucleoplasm.
mesh_terms: D002455:Cell Division; D002466:Cell Nucleolus / Q000648:ultrastructure*; D002467:Cell Nucleus / Q000648:ultrastructure*; D004261:DNA Replication; D005056:Euglena gracilis / Q000254:growth & development / Q000648:ultrastructure*; D008854:Microscopy, Electron; D008938:Mitosis
vernacular_title: Evolution ultrastructurale du noyau et du nuclêole de Euglena gracilis Z au cours du cycle cellulaire