Consulta: subjectFacets:"Microchromosomes"
Registros recuperados: 2
Data/hora: 10/06/2024 18:45:15

Karyotype variation in neoplastic cells associated to severity of disseminated neoplasia in the cockle Cerastoderma edule
Provedor de dados: 5
Autores: Matias, A. M.; Diaz, S.; Teixeira De Sousa, Joana; Villalba, A.; Carballal, M. J.; Leitao, A.
Disseminated neoplasia (DN) is characterized by an abnormal cell proliferation, usually resulting in death of the affected mollusks. In the present study we performed, for the first time, karyotypes of two different stages of DN in the cockle Cerastoderma edule. Analysis of moderate (N2) and high (N3) severity neoplasic metaphases displayed a chromosome number ranging from 57 to 317, instead of the normal diploid number of 38. Cockles with N2 showed a lower percentage of microchromosomes and a higher ploidy than those with N3. The comparison of both cytogenetic profiles contributes to better understand the evolution of DN in cockles.
Tipo: Text
Palavras-chave: Karyotype; Disseminated neoplasia; Cerastoderma edule; Microchromosomes.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00184/29550/27876.pdf

Chromosomal variability in the wild ornamental species of Symphysodon (Perciformes: Cichlidae) from Amazon
Provedor de dados: 83
Autores: Mesquita,Débora R.; Porto,Jorge I. R.; Feldberg,Eliana.
Cytogenetic studies were conducted on three discus species which inhabit the Amazon in Brazil: Symphysodon haraldi from Manacapuru, S. aequifasciatus from Tefé and S. discus from Barcelos. All individuals showed 2n=60 chromosomes, most of them biarmed. No sexual chromosomal heteromorphism was verified. However, different karyotypic formulae, owing to the presence of subtelocentric chromosomes, were verified for S. aequifasciatus and S. discus. One of the karyotypic formulae from S. aequifasciatus (cytotype 2) differs from the others, due to one of the homologues in the first chromosome pair being significantly larger than the other. A large variability was observed toward the nucleolar organizer regions (NOR) of S. haraldi and S. aequifasciatus. Although...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Discus; Cytogenetics; Polymorphism; Microchromosomes; Multiple NORs.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000200005