Consulta: creatorFacets:"Noleto,Rafael Bueno"
Registros recuperados: 5
Data/hora: 09/06/2024 18:42:21

Karyotypic characterization of Hydromedusa tectifera (Testudines, Pleurodira) from the upper Iguaçu River in the Brazilian state of Paraná
Provedor de dados: Genetics and Molecular Biology
Autores: Noleto,Rafael Bueno; Kantek,Daniel Luis Zanella; Swarça,Ana Cláudia; Dias,Ana Lúcia; Fenocchio,Alberto Sergio; Cestari,Marta Margarete.
We present the karyotypic characterization of 26 specimens of the side-necked turtle Hydromedusa tectifera collected in the upper Iguaçu River, Paraná state, Brazil. The turtles were cytogenetically analyzed using Giemsa staining and other banding techniques (C, G, Ag-NOR and CMA3) as well as fluorescence in situ hybridization (FISH) with a rDNA 18S probe. All the specimens showed a diploid number of 58 composed of 22 macro and 36 microchromosomes. The Ag-NOR, CMA3 and FISH techniques permitted the identification and characterization of the chromosome pairs bearing nucleolus organizer regions (NORs), while G-banding facilitated a better recognition and pairing of macrochromosomes. These data agree with some information available in the literature and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; FISH; G-banding; Pleurodira; Turtle.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200011

Population analysis of a chromosome polymorphism in Astyanax (Teleostei, Characiformes) species endemic to the Iguaçu River
Provedor de dados: Genetics and Molecular Biology
Autores: Kantek,Daniel Luis Zanella; Cipriano,Roger Raupp; Noleto,Rafael Bueno; Fenocchio,Alberto Sergio; Artoni,Roberto Ferreira; Cestari,Marta Margarete.
Chromosomal analyses were performed in the fish Astyanax sp.D collected from three different points: two streams from the right bank and one from the left bank of the Upper Iguaçu River, Paraná State, Brazil. The individuals from all localities possess 2n = 50 chromosomes and a FN = 84 (4m+24sm+6st+16a). The C-banding pattern was similar in all populations. However, within each population, an interindividual variation concerning the number and localization of heterochromatic bands was observed. Some of these variations were quantified in each population, and the results indicate that the samples were not different when studying the variable frequencies. Considering that Astyanax sp.D is typical in the headwaters of the Iguaçu River, these results were not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population cytogenetics; Chromosome variations; Astyanax fish.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200013

Comparative cytogenetics among species of the Astyanax scabripinnis complex: evolutionary and biogeographical inferences
Provedor de dados: Genetics and Molecular Biology
Autores: Vicari,Marcelo Ricardo; Noleto,Rafael Bueno; Artoni,Roberto Ferreira; Moreira-Filho,Orlando; Bertollo,Luiz Antonio Carlos.
Karyotype data are presented for distinct species of the genus Astyanax from four rivers belonging to three different hydrographic basins of the State of Paraná, Brazil (Verde River - Tibagi basin, Açungui River - Ribeira basin, and Santo Antônio and Jaguariaíva Rivers - Jaguariaíva basin). Three karyotypic forms were identified, here denominated karyotype A (2n = 50 chromosomes, with 8m+18sm+10st+14a, and thirteen 18S rDNA sites); karyotype B (2n = 50 chromosomes, with 8m+18sm+10st+1f4a, and four 18S rDNA sites); and karyotype C (2n = 48 chromosomes, with 10m+16sm+10st+12a, and eight 18S rDNA sites). The pattern of constitutive heterochromatin was similar among the three karyotypic forms, with few differences. The 5S rDNA corresponds to a synapomorphic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Karyotype evolution; Cytotaxonomy; RDNA sites; Biogeography.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200002

Chromosomal studies of five species of the marine fishes from the Paranaguá Bay and the karyotypic diversity in the marine teleostei of the Brazilian coast
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Cipriano,Roger Raupp; Fenocchio,Alberto Sérgio; Artoni,Roberto Ferreira; Molina,Wagner; Noleto,Rafael Bueno; Kantek,Daniel Luis Zanella; Cestari,Marta Margarete.
In this study, five species of marine fishes from the Paranaguá Bay in the Brazilian coast were evaluated. Eucinostomus argenteus and Diapterus rhombeus (Gerreidae) presented 48 chromosomes, all of which more acrocentric (FN = 48); Strongylura timucu and S. marina (Belonidae) also presented 48 chromosomes, but with a higher karyotypic complexity than the Gerreidae, 10M+2SM+36A (FN = 60) and 4M+44A (FN = 52), respectively. The fifth species, Mugil curema (Mugilidae), different than the others, presented only 28 chromosomes 20M+4ST+4A (FN = 48). The species presented diversity in the karyotypic macro-structure, which should be relevant for the cytotaxonomy and the evolution of this group of the vertebrate.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marine fishes; Karyotype; Cytotaxonomy; Karyotypic evolution.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000200010

Cytotaxonomy, heterochromatic polymorphism and natural triploidy of a species of Astyanax (Pisces, Characidae) endemic to the Iguaçu river basin
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Kantek,Daniel Luis Zanella; Noleto,Rafael Bueno; Fenocchio,Alberto Sérgio; Cestari,Marta Margarete.
Cytogenetic analysis with Astyanax sp. D revealed a karyotype of 2n=50 with 2M+26SM+6ST+16A, besides a triploid specimen showing 2n=75 chromosomes (3M+39SM+9ST+24A). C-banding strongly stained the terminal regions of several SM-ST-A chromossomes. Two pairs of acrocentric chromosomes presented interstitial heterochromatin, this state being polymorphic and occuring due to possible paracentric inversions. The results obtained with the AluI restriction enzyme and A3 chromomycin were similar to the C-banding. Relationships were proposed between Astyanax sp. D and A. scabripinnis, as well as considerations for a possible origin of the triploid specimen (2n=3x=75). When comparing the present results with cytogenetic features of other endemic Astyanax species in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytogenetics; Triploidy; Paracentric inversion.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000100008