| cytogenetic evidence for de novo synthesis of rrna and involvement of nucleolar material in the organization of cell structures during spermiogenesis of chariesterus armatus (heteroptera, coreidae). | the nucleolar material of chariesterus armatus was analyzed during spermiogenesis in cell preparations impregnated with silver nitrate. nucleolar corpuscles were observed in spermatids at the beginning of the process, showing that this organoid is also maintained after meiosis. in addition, nucleoli were seen in the round spermatids connected to the x-chromosome (bearer of the nucleolar organizer in c. armatus), indicating de novo synthesis of nucleolar material. this differs from the reorganiza ... | 2010 | 20882483 |
| uncovering the molecular organization of unusual highly scattered 5s rdna: the case of chariesterus armatus (heteroptera). | one cluster of 5s rdna per haploid genome is the most common pattern among heteroptera. however, in chariesterus armatus, highly scattered signals were noticed. we isolated and characterized the entire 5s rdna unit of c. armatus aiming to a deeper knowledge of molecular organization of the 5s rdna among heteroptera and to understand possible causes and consequences of 5s rdna chromosomal spreading. for a comparative analysis, we performed the same approach in holymenia histrio with 5s rdna restr ... | 2018 | 29253608 |