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	Provedor de dados Genet. Mol. Biol. (4) Neotropical Ichthyology (1) Autor Collares-Pereira,Maria João (5) Almeida,Mara Cristina de (1) Artoni,Roberto Ferreira (1) Biléu,R.I. (1) Carvalho,Cláudia (1) Matoso,Daniele Aparecida (1) Monteiro,Rita (1) Moraes Neto,Américo (1) Proença,Sónia J. R. (1) Proença,Sónia J.R. (1) Próspero,M.I. (1) Rodrigues,E.M. (1) Serrano,Artur R. M. (1) Serrano,Artur R.M. (1) Silva,Maelin da (1) Vicari,Marcelo Ricardo (1) Mais... Palavra-chave Chromosome evolution (2) RDNA localization (2) Ag/CMA3-banding (1) Chromosome polymorphism (1) Cicindela (1) Cicindelidae (1) Flow cytometry (1) Megacephalini (1) Multiple sex chromosomes (1) NORs (1) Oxycheila (1) Pimelodus britskii (1) Pseudoplatystoma reticulatum (1) Sex chromosome system (1) Sorubim lima (1) Spontaneous triploidy (1) Steindachneridion parahybae (1) Tiger beetles (1) Mais... Tipo do documento Info:eu-repo/semantics/article (5) Ano 2011 (1) 2009 (1) 2005 (1) 2004 (1) 1998 (1) País Brazil (5) Idioma Inglês (5)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 5 Primeira ... 1 ... Última Chromosome evolution in tiger beetles: Karyotypes and localization of 18S rDNA loci in Neotropical Megacephalini (Coleoptera, Cicindelidae) Genet. Mol. Biol. Proença,Sónia J.R.; Collares-Pereira,Maria João; Serrano,Artur R.M.. Four Neotropical tiger beetle species, three from the genus Megacephala and one from the genus Oxycheila, currently assigned to the tribe Megacephalini were examined cytogenetically. All three Megacephala species showed simple sex chromosome systems of the X0/XX type but different numbers of autosomal pairs (15 in M. cruciata, 14 in M. sobrina and 12 in M. rutilans), while Oxycheila tristis was inferred to have a multiple sex chromosome system with four X chromosomes (2n = 24 + X1X2X3X4Y/X1X1X2X2X3X3X4X4). Fluorescence in situ hybridization (FISH) using a PCR-amplified 18S rDNA fragment as a probe revealed the presence of rDNA clusters located exclusively on the autosomes in all the Megacephala species (five clusters in M. cruciata, eight in M. sobrina and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome evolution; Cicindelidae; Megacephalini; Oxycheila; RDNA localization; Sex chromosome system. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500012 Cytogenetic variability in three species of the genus Cicindela (s.l.) (Coleoptera, Cicindelidae): karyotypes and localization of 18S rDNA genes Genet. Mol. Biol. Proença,Sónia J. R.; Collares-Pereira,Maria João; Serrano,Artur R. M.. Three tiger beetle species from the Cicindelini tribe were examined cytogenetically and found to have the following karyotypes: Cicindela argentata, 2n = 18 + X1X2Y/X1X1X2X 2; Cicindela aurulenta, 2n=18 + X1X2X3Y/X1X1X 2X2X3X3 and Cicindela suturalis, 2n = 18 + X1X2X3X4Y/X1X 1X2X2X3X3X4X 4. Fluorescence in situ hybridization (FISH) using a PCR-amplified 18S rDNA fragment as a probe showed the presence of ribosomal clusters in two autosomes in C. argentata, two autosomes and two heterosomes in C. aurulenta and in two heterosomes in C. suturalis (male configuration), revealing two new patterns of rDNA localization. Such results are representative of the cytogenetic variability observed in the species rich genus Cicindela (sensu lato) mainly as regards the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome evolution; Cicindela; Multiple sex chromosomes; RDNA localization; Tiger beetles. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000400015 Leuciscus (Pisces, Cyprinidae) karyotypes: Transect of Portuguese populations Genet. Mol. Biol. Collares-Pereira,Maria João; Próspero,M.I.; Biléu,R.I.; Rodrigues,E.M.. The presently described Iberian chubs - Leuciscus carolitertii and L. pyrenaicus - sampled throughout their distribution ranges in Portugal were cytogenetically analyzed. Their chromosome numbers were consistently 2n = 50, except for two specimens of L. carolitertii, which exhibited a supernumerary chromosome in some of the metaphases. The karyotypes were found to be highly typical for other Leuciscus taxa, as well as for European leuciscine cyprinids: the chromosome sets are dominated by metacentric and submetacentric elements with a reduced number of acrocentric pairs (three to four); the largest pair of the complements belongs typically to this latter category. The chubs from northern drainages, assignable to L. carolitertii, have apparently a more... Tipo: Info:eu-repo/semantics/article Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000100011 Karyotype and genome size of Iberochondrostoma almacai (Teleostei, Cyprinidae) and comparison with the sister-species I. lusitanicum Genet. Mol. Biol. Monteiro,Rita; Carvalho,Cláudia; Collares-Pereira,Maria João. This study aimed to define the karyotype of the recently described Iberian endemic Iberochondrostoma almacai, to revisit the previously documented chromosome polymorphisms of its sister species I. lusitanicum using C-, Ag-/CMA3 and RE-banding, and to compare the two species genome sizes. A 2n = 50 karyotype (with the exception of a triploid I. lusitanicum specimen) and a corresponding haploid chromosome formula of 7M:15SM:3A (FN = 94) were found. Multiple NORs were observed in both species (in two submetacentric chromosome pairs, one of them clearly homologous) and a higher intra and interpopulational variability was evidenced in I. lusitanicum. Flow cytometry measurements of nuclear DNA content showed some significant differences in genome size both... Tipo: Info:eu-repo/semantics/article Palavras-chave: Ag/CMA3-banding; Flow cytometry; NORs; Chromosome polymorphism; Spontaneous triploidy. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200011 Karyotype variability in neotropical catfishes of the family Pimelodidae (Teleostei: Siluriformes) Neotropical Ichthyology Moraes Neto,Américo; Silva,Maelin da; Matoso,Daniele Aparecida; Vicari,Marcelo Ricardo; Almeida,Mara Cristina de; Collares-Pereira,Maria João; Artoni,Roberto Ferreira. Karyotypic data are presented for four species of fish belonging to the Pimelodidae family. These species show a conserved diploid number, 2n = 56 chromosomes, with different karyotypic formulae. The analyzed species showed little amount of heterochromatin located preferentially in the centromeric and telomeric regions of some chromosomes. The nucleolus organizer regions activity (Ag-NORs) and the chromosomal location of ribosomal genes by fluorescent in situ hybridization (FISH), with 18S and 5S probes, showing only one chromosome pair marked bearer of ribosomal genes, the only exception was Pimelodus britskii that presented multiple NORs and syntenic location of the 18S and 5S probes. Non-Robertsonian events, as pericentric inversion and NORs duplication... Tipo: Info:eu-repo/semantics/article Palavras-chave: Pseudoplatystoma reticulatum; Pimelodus britskii; Sorubim lima; Steindachneridion parahybae. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100007 Registros recuperados: 5 Primeira ... 1 ... Última

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