Consulta: subjectFacets:"Nucleolus organizer region"
Registros recuperados: 3
Data/hora: 06/06/2024 05:30:06

Cytogenetic characterization of Hypostomus nigromaculatus (Siluriformes: Loricariidae)
Provedor de dados: 83
Autores: Rubert,Marceléia; Zawadzki,Cláudio H.; Giuliano-Caetano,Lucia.
Hypostomus is the most speciose genus in the family Loricariidae, with approximately 120 species. These fish show a wide morphological and color variation, which hinders the identification of species, mainly of widely distributed representatives. The aim of this study was to contribute to the current knowledge on cytogenetic features of Hypostomus nigromaculatus. Three specimens of H. nigromaculatus, collected in two tributaries of rio Tibagi, Paraná, and in Cachoeira de Emas, rio Mogi-Guaçu, São Paulo, the latter being the type locality of H. nigromaculatus, were studied. Chromosomal preparations were submitted to Giemsa staining, silver nitrate impregnation, C-banding and CMA3 and DAPI fluorochromes staining. All samples presented 2n = 76, but the rio...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Karyotype evolution; Nucleolus organizer region; Heterochromatin; Hypostominae.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000100011

A comparative structural cytogenetic study in three allopatric populations of Astyanax scabripinnis (Teleostei: Characidae)
Provedor de dados: 103
Autores: Santos,Natália M.; Ferreira-Neto,Maressa; Artoni,Roberto F.; Vicari,Marcelo R.; Bakkali,Mohammed; Oliveira,Claudio de; Foresti,Fausto.
Individual samples from five populations of the characid fish Astyanax scabripinnis (Jenyns, 1842) from the Tietê and Paranapanema river basins (Brazil) were studied. All individuals analyzed presented 50 chromosomes but three different karyotypic forms were observed. Additionally, some individuals of one karyomorph presented a macro supernumerary chromosome. No chromosomal differentiation was observed between males and females in any sample analyzed. C-banding revealed two distinct distribution patterns in these populations in which strong terminally located heterochromatic blocks were detected in the long arms of some chromosomes of the specimens from Cascatinha, Cintra, and Funari streams, whereas populations of the Capão Bonito stream and the Barbosa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome markers; Karyoevolution; Karyomorphs; Nucleolus organizer region.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000200008

Colocalization of coilin and nucleolar proteins in Cajal body-like structures of micronucleated PtK2 cells
Provedor de dados: 56
Autores: Silva,N.P.; Christofolini,D.M.; Mortara,R.A.; Andrade,L.E.C.
Cajal bodies (CB) are ubiquitous nuclear structures involved in the biogenesis of small nuclear ribonucleoproteins and show narrow association with the nucleolus. To identify possible relationships between CB and the nucleolus, the localization of coilin, a marker of CB, and of a set of nucleolar proteins was investigated in cultured PtK2 cells undergoing micronucleation. Nocodazol-induced micronucleated cells were examined by double indirect immunofluorescence with antibodies against coilin, fibrillarin, NOR-90/hUBF, RNA polymerase I, PM/Scl, and To/Th. Cells were imaged on a BioRad 1024-UV confocal system attached to a Zeiss Axiovert 100 microscope. Since PtK2 cells possess only one nucleolus organizer region, micronucleated cells presented only one or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cajal body; Coiled body; Micronuclei; Cell nucleolus; Nucleolus organizer region; RNA polymerase I; Nucleolar proteins.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000700008