Consulta: creatorFacets:"Fenocchio,Alberto Sergio"
Registros recuperados: 5
Data/hora: 10/06/2024 13:42:56

Karyotypic characterization of Hydromedusa tectifera (Testudines, Pleurodira) from the upper Iguaçu River in the Brazilian state of Paraná
Provedor de dados: 74
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: 74
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

Genetic damage induced by trophic doses of lead in the neotropical fish Hoplias malabaricus (Characiformes, Erythrinidae) as revealed by the comet assay and chromosomal aberrations
Provedor de dados: 74
Autores: Cestari,Marta Margarete; Lemos,Priscilla Maria M.; Ribeiro,Ciro Alberto de Oliveira; Costa,João Ricardo M. Alves; Pelletier,Emilien; Ferraro,Marcos V.M.; Mantovani,Mário Sérgio; Fenocchio,Alberto Sergio.
The effects of clastogenic or mutagenic agents have rarely been studied in neotropical fish species exposed to contaminated water. In this study, the genetic damage caused by lead in the widely distributed South American fish, Hoplias malabaricus, was assessed using the comet (SCGE) assay and by testing for chromosomal aberrations. Eighteen specimens were acclimatized to laboratory conditions and then chronically exposed to contaminated food by feeding prey (Cyprinus sp.) injected intraperitoneally with doses of inorganic lead adjusted to give a contamination level of 21 mg of Pb2+.g-1 net weight of H. malabaricus. Three fish were sampled for chromosomal analysis after four doses (18 days) and another three after eight doses (41 days) of lead and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomal aberrations; Comet assay; Genotoxicity; Hoplias malabaricus; Lead; Mutagenesis.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200023

Origen, afianzamiento e impacto de la Licenciatura en Genética de la Universidad Nacional de Misiones
Provedor de dados: 46
Autores: Fenocchio,Alberto Sergio; Pastori,María Cristina.
La Licenciatura en Genética de la Universidad Nacional de Misiones fue creada en 1975 y representa una oferta académica realmente innovadora para la época en que fue concebida. Asimismo, es el fruto de la interacción entre personas de distintos países, orígenes y formación, pero con clara visión acerca de la importancia de la educación para el desarrollo, de la necesidad de abrir nuevos campos de enseñanza de las ciencias. También es un ejemplo de la posibilidad de articulación e integración en la realización de proyectos trascendentes sin la intervención explícita de estados ni gobiernos.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Educación Científica; Genética; Licenciatura en Genética.
Ano: 2011
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332011000100004

Chromosomal analyses in Megalonema platanum (Siluriformes: Pimelodidae), an endangered species from South American rivers
Provedor de dados: 83
Autores: Carvalho,Rafael Augusto de; Sanchez,Sebástian; Swarça,Ana Claudia; Fenocchio,Alberto Sergio; Martins-Santos,Isabel C.; Dias,Ana Lúcia.
This study presents chromosomal data of Megalonema platanum from rio Tibagi, Paraná, Brazil and from rio Paraná, Argentina. The diploid number was equal 54 with karyotype composition of 24m+16sm+2st+12a in both populations. The AgNOR sites were detected in the terminal position of a submetacentric pair of the two analyzed populations, coinciding with secondary constrictions on the short arm of pair 15. CMA3 and FISH with 18S rDNA probe displayed fluorescent signals that correspond to the AgNOR sites and secondary constriction. The presence of a small acrocentric supernumerary chromosome can be observed in M. platanum from rio Tibagi, with centromeric heterochromatin. Others heterochromatic blocks were evidenced in the terminal position of some chromosome...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytogenetics; C-banding; CMA3; FISH; NORs; Pimelodidae.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100017