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Registros recuperados: 27
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A new karyotype of Calomys (Rodentia, Sigmodontinae) Iheringia, Sér. Zool.
Lima,J. Fernando de S.; Kasahara,Sanae.
The genus Calomys Waterhouse, 1837 is widely distributed within South America, being found in Venezuela, Colombia, Peru, Bolivia, Brazil, Paraguay, Uruguay and Argentina. Specimens of Calomys were collected in Formoso do Araguaia, Tocantins, Brazil. For chromosome characterization standard staining techniques and as G-banding and nucleolar organizer region were used. The karyotype was 2n=46 and AN=66. The X chromosome is a medium metacentric and the Y chromosome a small acrocentric chromosome. Chromosome homologies with other species were observed. Probably, karyotype differences were basically due to Robertsonian rearrangements.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Calomys; Karyotype; Chromosome; Tocantins; Brazil.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212001000200019
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Alstroemeria presliana Herb. (Alstroemeriaceae) in Chile from a Cytogenetic Perspective Chilean J. Agric. Res.
Baeza,Carlos M; Schrader,Otto; Ruiz,Eduardo; Negritto,M.
Alstroemeria (Alstroemeriaceae) is an endemic genus of South America with two major distribution centers in the continent: Chile and Brazil. In Chile the genus is distributed from the North, near Iquique (20º13’ S, 70º09’ W) to the Chilean and Argentine Patagonia (53º10’ S, 70º54’ W). The central zone of Chile presents the highest number of species. A. presliana Herb. grows from Curicó (34º59’ S, 71º14’ W) to Cautín (38º45’ S, 72º34’ W) in Chile and Neuquén (36º50’ S, 71º05’ W), Argentina. A comparative karyotype study was made between a population of A. presliana subsp. presliana and a population of A. presliana subsp. australis Ehr. Bayer. Both populations presented asymmetric karyotypes, with 2n = 2x = 16 chromosomes, but with different chromosome...
Tipo: Journal article Palavras-chave: Alstroemeriaceae; Karyotype; Chromosome numbers; Chile.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000400002
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Astyanax aff. fasciatus Cuvier, 1819 (Teleostei; Characidae): evidences of a species complex in the upper rio Tibagi basin (Paraná, Brazil) Neotropical Ichthyology
Artoni,Roberto Ferreira; Shibatta,Oscar Akio; Gross,Maria Claudia; Schneider,Carlos Henrique; Almeida,Mara Cristina de; Vicari,Marcelo Ricardo; Bertollo,Luiz Antonio Carlos.
Four populations of Astyanax aff. fasciatus of the upper rio Tibagi (municipal district of Ponta Grossa, Paraná State, Brazil), had their karyotypes and morphometry analyzed. The cytogenetic data show the occurrence of distinct karyotypes (cytotypes), here named cytotype A, with 2n=48 chromosomes (6m+18sm+14st+10a), cytotype B, with 2n=50 chromosomes (8m+18sm+14st+10a) and cytotype C, with 2n=50 chromosomes (8m+18sm+14st+10a). The distribution pattern of the constitutive heterochromatin was very similar between cytotypes A and B, but diverged in relation to cytotype C. Distinct cytotypes may occur in sympatry in the upper rio Tibagi region, with the exception of the Furna 2 sample, which presents cytotype A exclusively. In addition, a specimen with 2n=49...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tetra; Morphometrics; Karyotype; Sympatry; Cryptic species.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200005
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Chilean plants cytogenetic database: coverage, features and usages JBAG
Jara-Seguel,Pedro; Urrutia-Estrada,Jonathan.
Chilean Plants Cytogenetic Database (CPCD) is a resource available on line in electronic format, which provides a cytogenetics catalogue for continental and insular Chilean vascular plants. In this report, we made reference to the CPCD, discussing aspects on its coverage, features and usages. Currently, the database stores cytogenetic information for 247 species, 107 genera, and 55 families belonging to Pteridophyta, Pinophyta, and Magnoliophyta.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome number; Karyotype; Chilean Plants.
Ano: 2018 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332018000100006
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Chromosomal characterization of Irenomys Tarsalis (Rodentia, Cricetidae, Sigmodontinae) Mastozool. neotrop.
Ojeda,Agustina A.; Ríos,Carolina A.; Gallardo,Milton H..
The systematics of I. tarsalis is far from being understood. Morphological and molecular analyses have given contradictory results, pointing towards its inclusion or exclusion from the Phyllotini. The karyotype of Irenomys tarsalis, as well as its C-bands are reported for the first time. The species has 2n = 64 chromosomes (FN = 98) and a C-banding pattern characterized by small amounts of centromeric heterochromatin. Although the high diploid number and the C-bands of I. tarsalis support the notion of the species´ ancestral karyotypic condition, its affiliation within the sigmodontines cannot be discerned by the data.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Irenomys tarsalis; Karyotype; Sigmodontinae; Phyllotini.
Ano: 2004 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832004000100011
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Chromosomal characterization of the bonytongue Arapaima gigas (Osteoglossiformes: Arapaimidae) Neotropical Ichthyology
Marques,Debora Karla; Venere,Paulo Cesar; Galetti Junior,Pedro Manoel.
The mitotic chromosomes of the pirarucu Arapaima gigas inhabiting the middle Araguaia River and collected in the municipality of Araguaiana (MT, Brazil) were studied. The chromosomes were analyzed through Giemsa staining, C-banding, Ag-NOR staining and in situ hybridization using an 18S rRNA gene probe. The karyotype had 2n=56 comprising 14 biarmed and 14 uniarmed chromosome pairs in both sexes. No cytologically distinguishable sex chromosome was identified. A single NOR-bearing chromosome pair was detected by Ag-NOR staining and confirmed by 18S rDNA- FISH. Faint constitutive heterochromatin was C-banded in the centromeric region of some chromosomes.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pirarucu; Karyotype; RDNA; Heterochromatin.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200007
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Comparative karyological study of cupped oyster species ArchiMer
Leitao, Alexandra; Boudry, Pierre; Labat, Jean-philippe; Thiriot-quievreux, Catherine.
Chromosomes of six cupped oyster species were studied using karyometric analysis alter conventional Giemsa staining, and silver staining, Karyotypes of Crassotrea angulata (nine metacentric and one submetacentric chromosome pairs), C. sikamea (nine metacentric and one submetacentric chromosome pairs), C. virginica (eight metacentric and two submetacentric chromosome pairs), C, ariakensis (eight metacentric and two submetacentric chromosome pairs), C, gasar (six metacentric and four submetacentric chromosome pairs), and Saccostrea commercialis (eight metacentric and two submetacentric chromosome pairs) are distinguishable by the number and position of the submetacentric chromosome pair and by the location of nucleolus organizer regions, Comparative...
Tipo: Text Palavras-chave: Bivalvia; Cytotaxonomy; Karyotype; Chromosome; Cupped oyster.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/publication-2737.pdf
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Cytogenetic evidences on the evolutionary relationships between the tetraploids of the section Rhizomatosae and related diploid species (Arachis, Leguminosae). Repositório Alice
ORTIZ, A. M.; ROBLEDO, G.; SEIJO, G.; VALLS, J. F. M.; LAVIA, G. I..
bitstream/item/181202/1/Ortiz2017-Article-CytogeneticEvidencesOnTheEvolu.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Evolutionary relationships; RDNA loci; Rhizomatosae; Karyotype; Arachis; Heterochromatin.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1073280
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Cytogenetic studies in three species of Lutjanus (Perciformes: Lutjanidae: Lutjaninae) from the Isla Margarita, Venezuela Neotropical Ichthyology
Nirchio,Mauro; Rondón,Rodolfo; Oliveira,Claudio; Ferreira,Irani A.; Martins,Cesar; Pérez,Julio; Sola,Luciana; Rossi,Anna Rita.
In the present study, three species of Lutjaninae, Lutjanus analis, L. griseus and L. synagris, were analyzed by conventional Giemsa staining, C-banding and silver staining, to reveal active Nucleolus Organizer Regions (NORs). Fluorescent in situ hybridization (FISH) was also applied to establish the number and location of the ribosomal gene clusters (18S and 5S rRNA genes). Counts of diploid metaphasic cells revealed a diploid modal chromosome complement composed of 48 acrocentric chromosomes in both L. analis and L. griseus. Two cytotypes were observed in L. synagris: cytotype I, with 2n=48 acrocentric chromosomes, found in 19 specimens, and cytotype II, with 46 acrocentric chromosomes and one large metacentric, found in two specimens. The large...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Karyotype; Ribosomal genes; NOR polymorphism; C-banding; Robertsonian rearrangement.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000100012
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Cytogenetical and morphological features reveal significant differences among Venezuelan and Brazilian samples of Mugil curema (Teleostei: Mugilidae) Neotropical Ichthyology
Nirchio,Mauro; Cipriano,Roger; Cestari,Margarete; Fenocchio,Alberto.
Karyotype of M. curema from the Gulf of Mexico and Brazil have been reported as possessing chromosome complement with 2n=28 and FN=48, whereas specimens from Venezuela has been reported as possessing a diploid number 2n=24 and a conserved FN (48). Although at first sight this variation suggests the presence of a chromosomal intraspecific (interpopulational) variability, the possibility that we are dealing with two different species was examined. This work revisit the karyotypes of M. curema from Venezuela and Brazil, including new data on C-banding, and NOR localization, and compares morphologic characteristics of samples from both localities. Thus, besides diploid number, the constitutive heterochromatin distribution and NORs location, mark other...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Karyotype; C-band; NOR-banding; Meristic and morphometric features; Species identification.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000100006
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Cytotaxonomic diagnosis of Trichomycterus diabolus (Teleostei: Trichomycteridae) with comments about its evolutionary relationships with co-generic species Neotropical Ichthyology
Torres,Rodrigo A.; Oliveira,Claudio; Foresti,Fausto.
The karyotype and the Ag-NOR location of a sample of Trichomycterus diabolus collected in the córrego Hortelã (Botucatu, São Paulo, Brazil) are described. The species exhibited 2n=56 chromosomes (42 metacentrics, 12 submetacentrics and 2 subtelocentrics) and the nucleolus organizing region located near to the centromere on the long arm of the largest metacentric pair. The presence of 2n=56 chromosomes in T. diabolus is an interesting characteristic since until now all cis-Andean species karyotyped presented 2n=54 chromosomes while almost all trans-Andean species presented different diploid numbers. The possible origin of this unexpected karyotypic form is discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Trichomycterinae; Karyotype; Chromosome evolution; Fish cytogenetic.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252004000300003
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Evidence of differential chromosome loss in aneuploid karyotypes of the Pacific oyster, Crassostrea gigas ArchiMer
Leitao, Alexandra; Boudry, Pierre; Thiriot Quievreux, Catherine.
The G-banding technique was performed on aneuploid karyotypes from gill tissue of the Pacific oyster, Crassostrea gigas, to assess whether chromosome losses could be explained by differential chromosomal susceptibility and to clarify the negative correlation between aneuploidy and growth rate previously reported in different populations of this oyster. The study of 95 G-banded aneuploid karyotypes showed that only 4 of the 10 chromosome pairs (viz. 1, 5, 9, and 10) of C. gigas were affected by the loss of one homologous chromosome. Pairs 1, 9, and 10, which were lost in 56, 33, and 44% of cases, respectively, may be considered to be differentially affected. Hypotheses on this differential chromosomal susceptibility are discussed.
Tipo: Text Palavras-chave: Oyster; Karyotype; G banding; Growth; Aneuploidy; Huître; Caryotype; Bandes G; Croissance; Aneuploïdie.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/publication-742.pdf
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Integrative mapping analysis of chicken microchromosome 16 organization Inra
Solinhac, R.; Leroux, S.; Galkina; Chazara, O.; Feve, K.; Vignoles, F.; Morisson, M.; Derjusheva; Bed'Hom, B.; Vignal, A.; Fillon, V.; Pitel, F..
The chicken karyotype is composed of 39 chromosome pairs, of which 9 still remain totally absentfrom the current genome sequence assembly, despite international efforts towards complete coverage. Someothers are only very partially sequenced, amongst which microchromosome 16 (GGA16), particularly underrepresented,with only 433 kb assembled for a full estimated size of 9 to 11 Mb. Besides the obvious need of fullgenome coverage with genetic markers for QTL (Quantitative Trait Loci) mapping and major genes identificationstudies, there is a major interest in the detailed study of this chromosome because it carries the two geneticallyindependent MHC complexes B and Y. In addition, GGA16 carries the ribosomal RNA (rRNA) genes cluster, alsoknown as the NOR...
Tipo: Journal Article Palavras-chave: Chicken; Karyotype; QTL; GGA16; Genetic markers.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010b3abc731&uri=/notices/prodinra1/2010/12/
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Karyological and electrophoretic differences between Pomacea flagellata and P. patula catemacensis: Caenogastropoda: Ampullariidae Biocell
Diupotex-Chong,María Esther; Cazzaniga,Néstor J; Uribe-Alcocer,Manuel.
The widespread Mexican apple snail Pomacea flagellata (Say 1827) and the strictly endemic "tegogolo" P. patula catemacensis (Baker 1922) (restricted to Lake Catemaco), are the only known American Ampullariidae that have haploid complements n=13. Pomacea patula catemacensis has suffered a critical reduction in abundance due to immoderate fishing for human consumption. Chromosome slides were obtained from colchicine-injected Pomacea snails collected from nine locations along the coastal zone of the Gulf of Mexico, including Lake Catemaco, for use in principal component analysis (PCA). Total proteins in foot homogenates were analyzed through isoelectric focusing (IEF) and native-PAGE electrophoresis on polyacrylamide gels. The chromosome number 2n=26 was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Apple snails; Endangered species; Isoelectric focusing; Karyotype; Mexico; Native-PAGE electrophoresis.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452007000300002
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KARYOLOGY OF MUGIL LIZA AND M. CUREMA FROM VENEZUELA Boletín de Investigaciones
Nirchio T.,Mauro; Cequea,Hernán.
Karyotypes of Mugil liza and M. curema from Venezuela were studied. M. liza karyotype is 2n=48 acrocentric chromosomes, but M. curema is 2n=24, containing one submetacentric and 11 metacentric pairs. The chromosomic complement described for M. liza constitutes the first report for the species and coincides with the modal karyotype (2n=48) in the Mugilidae family. Venezuelan M. curema karyotype differs in number and shape from M. curema from Louisiana (USA), which has been reported to have a complement 2n=28 (10 metacentric pairs, two subtelocentric pairs and two acrocentric pairs).
Tipo: Journal article Palavras-chave: Karyotype; Chromosomes.
Ano: 1998 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97611998000100004
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Karyotipic asymmetry of both wild and cultivated species of pennisetum. Repositório Alice
TECHIO, V. H.; DAVIDE, L. C.; CAGLIARI, A.; BARBOSA, S.; PEREIRA, A. V..
2010
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Pennisetum purpureum; Pennisetum glaucum; Germplasm; Karyotype.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/868999
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Karyotype analysis of Minuartia mesogitana subsp. mesogitana and Minuartia elmalia (Caryophyllaceae, Alsinoideae) Boletín de la Sociedad
Yüce,Oguz; Eroglu,Halil Erhan; Koç,Murat; Hamzaoglu,Ergin.
Mitotic metaphase chromosomes, karyotypic characters, monoploid karyograms and ideograms of Minuartia mesogitana subsp. mesogitana and Minuartia elmalia were investigated. Analysis of somatic metaphases showed that the chromosome numbers and the karyotype formula of these taxa were 2n = 2x = 24 = 8m + 8sm + 8st for Minuartia mesogitana subsp. mesogitana and 2n = 2x = 32 = 12m + 16sm + 4st for Minuartia elmalia. No satellites were observed in the karyotypes of the taxa. The intrachromosomal and interchromosomal karyotype asymmetries were estimated with Mean Centromeric Asymmetry (MCA) and Coefficient of Variation of Chromosome Length (CVCL).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Minuartia; Karyotype; Ideogram; Karyotype asymmetry.
Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722016000300006
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Karyotype of a termitophilic species of Diplopoda (Polydesmida, Chelodesmidae) Braz. J. Genet.
Fontanetti,Carmem Silvia.
This report describes the karyotype of a Brazilian Diplopod species (Arthropoda), Sandalodesmus gasparae (Schubart, Acta Zool. Lilloana Inst. "Miguel Lillo" 2: 321-440,1944), collected from a termite mound Cornitermes bequaerti. This species has 2n = 12. The sex pair could not be distinguished.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Karyotype; Termitophilic; Diplopoda.
Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400010
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Karyotype variation in neoplastic cells associated to severity of disseminated neoplasia in the cockle Cerastoderma edule ArchiMer
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
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Karyotypic characterization of Prochilodus mariae, Semaprochilodus kneri and S. laticeps(Teleostei: Prochilodontidae) from Caicara del Orinoco, Venezuela Neotropical Ichthyology
Oliveira,Claudio; Nirchio,Mauro; Granado,Ángel; Levy,Sara.
Fish of the family Prochilodontidae are considered one of the most important components of commercial and subsistence fishery in freshwater environments in South America. This family consists of 21 species and three genera. In the present study, the karyotypes of Prochilodus mariae, Semaprochilodus kneri, and S. laticeps from Caicara del Orinoco, Bolivar State, Venezuela were studied. The species P. mariae, S. kneri and S. laticeps exhibited 2n=54 chromosomes (40 metacentric and 14 submetacentric), a single chromosome pair with nucleolus organizer regions, and a large amount of heterochromatin found at centromeric and pericentromeric positions in almost all chromosomes. The P. mariae specimens studied displayed 0 to 3 supernumerary microchromosomes. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Karyotype; C-band; NOR banding; Chromossome evolution; Characiformes.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000100005
Registros recuperados: 27
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