Consulta: subjectFacets:"C-bands"
Registros recuperados: 4
Data/hora: 11/06/2024 10:07:57

Karyotype characterization of Crotalaria juncea (L.) by chromosome banding and physical mapping of 18S-5.8S-26S and 5S rRNA gene sites
Provedor de dados: 74
Autores: Mondin,Mateus; Santos-Serejo,Janay A.; Aguiar-Perecin,Margarida L.R.
The chromosomes of Crotalaria juncea, a legume of agronomic interest with a 2n = 16 karyotype composed of metacentric chromosomes, were analyzed using several cytogenetic techniques. C-banding revealed heterochromatic regions around the centromeres in all chromosomes and adjacent to the secondary constriction on the chromosome 1 short arm. Fluorescent staining with the GC-specific chromomycin A3 (CMA) highlighted these heterochromatic regions and a tiny site on the chromosome 1 long arm while the AT-specific stain 4'-6-diamidino-2-phenylindole (DAPI) induced a reversed pattern. Staining with CMA combined with AT-specific distamycin A (DA) counterstaining quenched the pericentromeric regions of all chromosomes, but enhanced fluorescence was observed at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crotalaria juncea karyotype; C-bands; Fluorescent banding; FISH; RDNA sites; Ag-NOR.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000100013

The karyotype of Adenomera diptyx (Boettger 1885) (Anura, Leptodactylidae) from northeastern Argentina
Provedor de dados: 74
Autores: Zaracho,Víctor Hugo; Hernando,Alejandra Beatriz.
In this work we analyzed the karyotype of five populations of Adenomera diptyx from Argentina after conventional staining, Ag-NOR and C-banding. All specimens presented 2n = 26 and FN = 34. The karyotype was formed by three submetacentric, one metacentric and nine telocentric pairs. Silver staining revealed that the NOR was located on a secondary constriction in pair 7. C- banding evidenced constitutive heterochromatin at the pericentromeric region of all chromosomes. The karyotype of A. diptyx was similar to that of A. hylaedactyla (2n = 26, FN = 34) and different from that of A. andreae (2n = 26, FN = 40) in the fundamental number and secondary constriction position. It also differed from the karyotypes of A. marmorata (2n = 24, FN = 34 and 36) and of A....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adenomera diptyx; Argentina; Standard karyotype; Ag-NOR; C-bands.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100016

Comparative karyotype analysis in diploid and triploid Dolichoplana carvalhoi (Tricladida, Terricola, Rhynchodemidae) from Brazil
Provedor de dados: 74
Autores: Alvarez,Luciana; Almeida,Eunice Judith Cardoso de.
In this work, we present cytogenetic data for the land planarian Dolichoplana carvalhoi. Two different karyotypes, one diploid (2n = 2x = 14 chromosomes) and one triploid (2n = 3x = 21 chromosomes), corresponding to two morphological body patterns, are described. Chromosomes from regenerating blastema were studied after routine Giemsa staining and CBG banding. Our analyses revealed heteromorphisms in chromosomes 2, 3 and 4 of the diploid karyotype and in chromosomes 1, 3 and 7 of the triploid karyotype. Further studies are needed in order to determine if the two morphological patterns of D. carvalhoi represent distinct species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Land planarians; Dolichoplana carvalhoi; Cytogenetics; Triploidy; Heteromorphisms; C-bands.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000300013

Chromosome mapping of 5S rRNA genes differentiates Brazilian populations of Leporellus vittatus (Anostomidae, Characiformes)
Provedor de dados: 74
Autores: Aguilar,Cecilia Teixeira de; Galetti Junior,Pedro Manoel.
Among the anostomid fishes, the genus Leporellus is represented by only three species: L. nattereri, endemic of the Amazon River, L. retropinnis, endemic of the Piracicaba River, and L. vittatus, widely distributed in rivers from Peru, Colombia, Guianas, and different major hydrographic basins of Brazil. A cytogenetic study carried out on specimens of Leporellus vittatus from three major Brazilian hydrographic basins evidenced a karyotype of 54 metacentric and submetacentric chromosomes. C-banding analysis revealed the presence of large pericentromeric heterochromatic segments in all chromosomes and a telomeric block coincident with the NOR sites. Ag, CMA3 or MM staining, and FISH with ribosomal probes located the 45S ribosomal genes on the terminal region...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Karyotype; C-bands; 45S rDNA; 5S rDNA.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200004