Microchromosomes
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Repetitive DNAs and shrink genomes: A chromosomal analysis in nine Columbidae species (Aves, Columbiformes)
Abstract An extensive karyotype variation is found among species belonging to the Columbidae family of birds (Columbiformes), both in diploid number and chromosomal morphology. Although clusters of repetitive DNA sequences play an important role in chromosomal instability, and therefore in chromosomal rearrangements, little is known about their distribution
Genet. Mol. Biol.. Publicado em: 19/02/2018
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2. Estudos cromossômicos e moleculares em espécies de lagartos microteídeos, com ênfase na tribo Ecpleopodini (Gymnophthalmidae, Squamata) / Chromossomal and molecular studies on species of microteiid lizards, with emphasis on Ecpleopodini (Gymnophthalmidae, Squamata)
This study contributes to knowledge of the family Gymnophthalmidae, adding new genetic data of three genes for the tribe Ecpleopodini and description of 11 new karyotype for the family, belonging to the tribes Ecpleopodini, Heterodactylini, Iphisiini and Gymnophthalmini. Phylogenetic analysis for the tribe Gymnophthalmini aimed to investigate the position of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/06/2011
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3. Karyological study of Amphisbaena ridleyi (Squamata, Amphisbaenidae), an endemic species of the Archipelago of Fernando de Noronha, Pernambuco, Brazil
The karyotype of Amphisbaena ridleyi, an endemic species of the archipelago of Fernando de Noronha, in State of Pernambuco, Brazil, is described after conventional staining, Ag-NOR impregnation and fluorescence in situ hybridization (FISH) with a telomeric probe. The diploid number is 46, with nine pairs of macrochromosomes (three metacentrics, four subteloc
Genetics and Molecular Biology. Publicado em: 29/01/2010
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4. Descripción cariotípica de Spheniscus magellanicus (Spheniscidae) / Karyotypical description of spheniscus magellaniscus magellanicus (spheniscidae)
En este trabajo se describe por primera vez el cariotipo y el patrón de bandas C de Spheniscus magellanicus. Se tomaron muestras de sangre periférica de tres hembras y cuatro machos en Imbé (Rio Grande do Sul, Brasil). Para la obtención de metafases mitóticas se utilizó la técnica de cultivos de linfocitos de larga duración. El número diploide fue d
Publicado em: 2010
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5. Supernumerary chromosomes in the pufferfish Sphoeroides spengleri: first occurrence in marine Teleostean Tetraodontiformes fish
Cytogenetic analyses carried out in eight specimens of Sphoeroides spengleri revealed the presence of 2n = 46 chromosomes (20 M/SM and 26 ST/A). Besides the standard karyotypical set, the presence of B microchromosomes was observed in two individuals, ranging from 0 to 2 microchromosomes per cell. A karyotype composed by 2n = 46 chromosomes with occurrence o
Genetics and Molecular Biology. Publicado em: 2008
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6. Análises citogenéticas e expressão da telomerase em sarcoma 180
The cancer is a result of genetic instability. There are two theorical lines which try to explain this pathology origin, the conventional genetic theories and the chromosomal theory of cancer. A lot of neoplastic cell characteristics cant be explained by the conventional theories and they are explained by the chromosomal theory. The telomerase plays an impor
Publicado em: 2008
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7. Chromosome evolution: Karyotype variability in Platyrrhini and studies of sinteny and homologies between human chromosomes / Evolução cromossômica: estudo da variabilidade cariotípica em Platyrrhini e das homeologias e sintenias com cromossomos humanos
We studied the karyotypes of Brazilian monkeys (Platyrrhini, Primates) using both traditional cytogenetic techniques as well as FISH. FISH analysis employed human probes for chromosome 14, 15 and the X chromosome and a probe of the Y chromosome of Brachyteles arachnoides obtained by chromosome microdissection. Twenty-four individuals of Alouatta guariba clam
Publicado em: 2008
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8. Karyotypic characterization of Hydromedusa tectifera (Testudines, Pleurodira) from the upper Iguaçu River in the Brazilian state of Paraná
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.
Genetics and Molecular Biology. Publicado em: 2006
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9. Chromosomal banding patterns in the eyelid-less microteiid lizard radiation: The X1X1X2X2:X1X2Y sex chromosome system in Calyptommatus and the karyotypes of Psilophthalmus and Tretioscincus (Squamata, Gymnophthalmidae)
Cytogenetic studies were performed on five closely related microteiid lizards (Gymnophthalmini), three Calyptommatus species and Psilophthalmus paeminosus from the sand dunes of the middle São Francisco river in the semiarid caatinga of the Brazilian state of Bahia and Tretioscincus oriximinensis from the Brazilian Amazon region. The diploid chromosome numb
Genetics and Molecular Biology. Publicado em: 2005-12
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10. Estudo cromossomico em sindromes mielodisplasicas
The míelodysplastyc syndromes (MDS) can precede the development of acute nonlymphocytic leukemia (ANLL) and are classified as five different hemotological groups 1) refractory anaemia (RA), 2) refractory anaemia with ring sideroblasts (RAS), 3) refractory anaemia with excess blasts (RAEB), 4) refractory anaemia with excess blasts in transformation (RAEBt) a
Publicado em: 1988
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11. Comparison of the chicken and turkey genomes reveals a higher rate of nucleotide divergence on microchromosomes than macrochromosomes
A distinctive feature of the avian genome is the large heterogeneity in the size of chromosomes, which are usually classified into a small number of macrochromosomes and numerous microchromosomes. These chromosome classes show characteristic differences in a number of interrelated features that could potentially affect the rate of sequence evolution, such as
Cold Spring Harbor Laboratory Press.
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12. Chicken Microchromosomes Are Hyperacetylated, Early Replicating, and Gene Rich
The chicken karyotype consists of 39 chromosomes of which 33 are classed as microchromosomes (MICs). MICs contain about one third of genomic DNA. The majority of mapped chicken genes are assigned to macrochromosomes (MACs), but a recent study indicated that CpG islands (CGIs), which are associated with most vertebrate genes, map predominantly to MICs. The pr
Cold Spring Harbor Laboratory Press.