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| Registros recuperados: 87 | |
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| Castanhole,Márcia Maria Urbanin; Pereira,Luis Lênin Vicente; Souza,Hederson Vinicius de; Valério,José Raul; Barbosa,Leonardo Rodrigues; Itoyama,Mary Massumi. |
| Spittlebugs annually infest pastures and cause severe damage, representing a serious problem for the tropical American beef cattle industry. Spittlebugs are an important biotic constraint to forage production and there is a lack of cytogenetic data for this group of insects. For these reasons, we conducted this work, in which the spermatogenesis and nucleolar behavior of Deois flavopicta, Mahanarva fimbriolata and Notozulia entreriana were studied. The males possessed testes in the shape of a "bunch of grapes"; a variable number of testicular lobes per individual and polyploid nuclei composed of several heteropycnotic bodies. A heteropycnotic area was located in the periphery of the nucleus (prophase I); the chiasmata were terminal or interstitial;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chromosomal characterization; Karyotype; Cytogenetics; Spermatogenesis; Holocentric chromosomes. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200008 |
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| Conterato,Ionara Fatima; Dall'Agnol,Miguel; Schifino-Wittmann,Maria Teresa; Janke,Aline. |
| Twenty eight natural populations of Trifolium riograndense Burkart, an important forage legume from native pastures of the state of Rio Grande do Sul, Brazil, were evaluated for genetic diversity with eight Simple Sequences Repeats (SSR) markers. Chromosome numbers were also determined. The eight markers were polymorphic, with 35 alleles and an average of 4.37 alleles per locus, and Polymorphism Information Content (PIC) between 0.48 and 0.80. Group analysis based on Jaccard´s similarity coefficient separated the 28 accessions in nine groups, with an average genetic similarity of 0.44, indicating a high genetic variability among the populations. No evident relation between genetic distance and geographical origin was detected. The chromosome number of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Native clover; Genetic diversity; Cytogenetics; Native pastures. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200005 |
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| Ribeiro,E.M.S.F.; Rodriguez,J.M.; Cóser,V.M.; Sotero,M.G.; Fonseca Neto,J.M.; Pasquini,R.; Cavalli,I.J.. |
| Microsatellites are short tandem repeat sequences dispersed throughout the genome. Their instability at multiple genetic loci may result from mismatch repair errors and it occurs in hereditary nonpolyposis colorectal cancer. This instability is also found in many sporadic cancers. In order to evaluate the importance of this process in myeloid leukemias, we studied five loci in different chromosomes of 43 patients, 22 with chronic myelocytic leukemia (CML) in the chronic phase, 7 with CML in blast crisis, and 14 with acute myeloid leukemia (AML), by comparing leukemic DNA extracted from bone marrow and constitutional DNA obtained from buccal epithelial cells. Only one of the 43 patients (2.1%), with relapsed AML, showed an alteration in the allele length at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genomic instability; Mismatch repair errors; Cytogenetics; Leukemogenesis. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000200003 |
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| Smolarz, Kasia; Renault, Tristan; Soletchnik, Patrick; Wolowicz, Macciek. |
| A flow cytometry protocol was applied for the detection of neoplasia in Macoma balthica L. from the Gulf of Gdansk (Baltic Sea, Poland). A simple method, based on an osmotic shock, was used to permeabilise gill cells. The cytometric pattern of normal clams consisted of 2 peaks, a major peak B and a smaller peak C. The cytometric pattern of affected clams consisted of 2 peaks named B' and C'. Two parameters were used to define the stages of abnormalities in M. balthica clams based on the percentage of cells in peaks B, C, B' and C' and on the ratio between the fluorescence value of peaks B, C, B' and C' in all individuals. Three stages of neoplasia were clearly distinguished by flow cytometry considering peak C'. Stage 1 was characterised by a major... |
| Tipo: Text |
Palavras-chave: Baltic Sea; Macoma balthica; Neoplasia; Cytogenetics; Histology; Flow cytometry. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-2918.pdf |
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| Timbó,Ana Luiza de Oliveira; Pereira,Roselaine Cristina; Souza Sobrinho,Fausto; Davide,Lisete Chamma. |
| Breeding programs for Brachiaria spp. use both intraspecies and interspecies crosses between sexual and apomictic plants in order to obtain new cultivars with the desired characteristics. As there are different ploidy levels both within and between species of this genus, it becomes necessary to evaluate the genotypes used in breeding programs, as a guide to breeders when adopting crossing strategies. In this work, DNA content and chromosome number were determined in order to characterise ploidy levels in Brachiaria spp. genotypes. In the analysis of 15 genotypes, DNA content varied with the ploidy levels (2x, 3x and 4x), and between species and/or taxon. The average DNA content was 1.74 pg (2x) in B. ruziziensis, 3.74 pg (4x) in B. decumbens and 3.52 pg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Germplasm bank; Cytogenetics; Flow cytometry; Forage. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000100008 |
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| Techio, Vânia Helena; UNC; Davide, Lisete Chamma; UFLA; Souza, Tatiana Matioli; 3Bios Consultoria e Serviços Ambientais Ltda; Pereira, Antônio Vander; EMBRAPA-MG. |
| Avaliou-se o complemento cromossômico de 16 acessos de Pennisetum disponíveis na Coleção de Germoplasma da Embrapa Gado de Leite – Juiz de Fora, Estado de Minas Gerais. Para a avaliação citogenética, utilizou-se a técnica de esmagamento e coloração com Feulgen. Para quatro acessos foram obtidas metáfases com 2n = 28 cromossomos, confirmando sua classificação como P. purpureum. A origem híbrida P. purpureum x P. glaucum foi constatada em oito acessos, os quais apresentaram 2n = 21. Em um acesso identificado como híbrido entre P. purpureum x P. glaucum, foram observadas metáfases com 2n = 54, permitindo inferir que não se trata de um híbrido interespecífico triplóide. Para outros três acessos avaliados, também foram observadas células com 2n = 54, embora... |
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Palavras-chave: 2.00.00.00-6 Ciências Biológicas Pennisetum; Citogenética; Germoplasma; Híbridos interespecíficos. Pennisetum; Cytogenetics; Germplasm; Interspecific hybrids. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5016 |
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| VALLE, C. B. do; EUCLIDES, V. P. B.; PEREIRA, J. M.; VALÉRIO, J. R.; PAGLIARINI, M. S.; MACEDO, M. C. M.; LEITE, G. G.; LOURENÇO, A. J.; FERNANDES, C. D.; DIAS FILHO, M. B.; LEMPP, B.; POTT, A.; SOUZA, M. A. de. |
| A cultivar Xaraés (Brachiaria brizantha), coletada em Burundi. África, foi liberada pela Embrapa em 2003 após 15 anos de avaliações. É uma planta cespitosa, de 1,5 m de altura, folha lanceolada e longa, com poucos pêlos e de coloração verde-escura. Os colmos são finos e radicantes nos nós, e as inflorescência são grandes, como espiguetas em uma só fileira. A cultivar Xaraés é apomítica e penteploíde, com 45 cromossomos. Irregularidades na divisão meiótica reduzem a validade do pólen para, aproximadamente, 79%. Seus principais atributos possitivos são a alta produtividade, especialmente de folhas, a rápida rebrota e o florescimento tardio, prolongado o período de pastejo até o período seco. Além disso, apresenta bom valor nutritivo e alta capacidade de... |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Xaraés; Característica agronômica; Mata Atlântica; Brasil; Agronomic characters; Adaptation; Mixed pastures; Brazilian savannas.; Aclimatação; Brachiaria Brizantha; Citogenética; Cerrado; Diversificação de Cultura; Pastagem Cultivada; Plantio; Valor Nutritivo.; Brazil; Cytogenetics; Nutritive value; Planting; Sown pastures.. |
| Ano: 2004 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/326133 |
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| Gerard, Andre; Naciri, Yamama; Peignon, Jean-marie; Ledu, Christophe; Phelipot, Pascal; Baud, Jean-pierre; Nourry, Max; Haure, Joel; Heurtebise, Serge; Garnier, Jacqueline; Martin, Anne-genevieve; Claude, Serge; Langlade, Aime; Joly, Jean-pierre; Goulletquer, Philippe; Ruelle, Francois; Coatanea, Denis; Oheix, Jocelyne; Vercelli, Catherine; Chabirand, Jean-michel; Maurer, Daniele; Borel, Michel; Cardinal, Mireille; Cornet, Josiane; Le Pennec, Marcel; Le Mercier, A.. |
| This fifth part of the polyploidisation program reports the experiments that were conducted in 1993 and that were devoted to : - monitoring growth performance of Ostrea edulis diploids and triploids in La Trinité sur Mer and Palavas - monitoring growth performance of Crassostrea gigas diploids and triploids in Port en Bessin, Marennes Oleron (2 locations), Arcachon and Palavas - comparative study of gametogenesis for C. gigas diploids and triploids - comparative study of C. gigas diploids and triploids using sensorial analysis At the end of fifth year, it was clear that triploids are advantageous although such a statement must be moderated according to locations. The gametogenesis stydy showed that triploidy is associated with partial to complete... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Ostrea edulis; Cytogenetics; Polyploidy; Crassostra gigas; Ostrea edulis; Cytogénétique; Polyploïdie. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/1994/rapport-3860.PDF |
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| Barth,Adriane; Fernandes,Anderson; Pompolo,Silvia das Graças; Costa,Marco Antônio. |
| Tetragonisca angustula and Tetragonisca fiebrigi have recently been listed as valid species. This study aimed to cytogenetically investigate both species, emphasizing the new registry of B chromosomes in the tribe Meliponini. We analyzed colonies of T. angustula and T. fiebrigi collected at Tangará da Serra, Mato Grosso, Brazil, through conventional Giemsa staining, C-banding, and base-specific fluorochrome staining (CMA3/DAPI). T. angustula showed 2n = 34 chromosomes in females and n = 17 in males, with karyotype formula 2K = 34A M. T. fiebrigi showed numeric variation, with chromosome number varying from 2n = 34 to 2n = 36 in females and from n = 17 to n=18in males, with karyotype formula 2K = 32A M+2A Mc and 2K = 32A M+2A Mc + 1 or 2 B-chromosomes. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stingless bees; Cytogenetics; Interspecific differentiation; B chromosomes. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100014 |
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| Peres,Wellington Adriano Moreira; Bertollo,Luiz Antonio Carlos; Moreira Filho,Orlando. |
| Characidae is one of the largest fish families of the Neotropical region, and presenting a pronounced morphological variability, certainly does not constitute a monophyletic group. The cytogenetical data also show a large chromosomal variation and can provide important information for a better understanding of the relationships between the species of this group. 18S and 5S rDNA probes were used in the present study for the chromosomal mapping in different Characidae species from the São Francisco River (Astyanax lacustris, Astyanax scabripinnis, Hasemania nana, Piabina argentea, Orthospinus franciscensis, Serrapinnus heterodon, Serrapinnus piaba and Myleus micans) and Alto Paraná (Astyanax altiparanae) basins. Species with a single pair of chromosomes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cytogenetics; Neotropical fish; Fluorescent in situ hybridization (FISH); RDNA probe. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200009 |
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| Souza,Marcelo Santos de; Barcellos,Suziane Alves; Costa,Alice Lemos; Kretschmer,Rafael; Garnero,Analía Del Valle; Gunski,Ricardo José. |
| Abstract The Passeriformes is the most diverse and cytogenetically well-known clade of birds, comprising approximately 5,000 species. The sooty-fronted spinetail (Synallaxis frontalis Aves: Furnariidae) species, which belongs to the order Passeriformes, is typically found in South America, where it is widely distributed. Polymorphisms provide genetic variability, important for several evolutionary processes, including speciation and adaptation to the environment. The aim of this work was to analyze the possible cytotypes and systemic events involved in the species polymorphism. Of the sampled 19 individuals, two thirds were polymorphic, an event supposedly linked to mutations resulting from genomic evolution that can be transmitted hereditarily. A... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chromosomal polymorphism; Evolution; Cytogenetics. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000100062 |
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| QUINDERÉ,YEDA R. S. D; LOURENÇO,LUCIANA B; ANDRADE,GILDA V; TOMATIS,CRISTIAN; BALDO,DIEGO; RECCO-PIMENTEL,SHIRLEI M. |
| We investigated the NOR distribution in ten populations of Physalaemus cuvieri from different regions of Brazil and Argentina. A high variability in NOR pattern was observed and provided a useful tool in grouping several populations. The specimens from the state of Tocantins, northern Brazil, could easily be distinguished from all the other analyzed populations, since its karyotype presented NORs in the chromosome pairs 1,3,4 and 10 (and sometimes also in chromosome 5), and several pericentromeric C-bands. A NOR-site in chromosome 9 characterized three populations from the northeastern region of Brazil. Interestingly, the P. cuvieri populations located in opposite extremes of the geographic distribution had, as a fixed condition, the presence of NORs in 8q... |
| Tipo: Journal article |
Palavras-chave: Anura; Chromosome; Cytogenetics; NOR; Physalaemus; Polymorphic variations; Polytypic variations. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000100008 |
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| Santos,M.F.M.; Oliveira,F.C.A.C.; Kishimoto,R.K.; Borri,D.; Santos,F.P.S.; Campregher,P.V.; Silveira,P.A.A.; Hamerschlak,N.; Mangueira,C.L.P.; Duarte,F.B.; Crepaldi,A.H.; Salvino,M.A.; Velloso,E.D.R.P.. |
| Cytogenetics is essential in myeloid neoplasms (MN) and pre-analytical variables are important for karyotyping. We assessed the relationship between pre-analytical variables (time from collection to sample processing, material type, sample cellularity, and diagnosis) and failures of karyotyping. Bone marrow (BM, n=352) and peripheral blood (PB, n=69) samples were analyzed from acute myeloid leukemia (n=113), myelodysplastic syndromes (n=73), myelodysplastic syndromes/myeloproliferative neoplasms (n=17), myeloproliferative neoplasms (n=137), and other with conclusive diagnosis (n=6), and reactive disorders/no conclusive diagnosis (n=75). The rate of unsuccessful karyotyping was 18.5% and was associated with the use of PB and a low number of nucleated cells... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cytogenetics; Karyotype; Leukemia; Myelodysplasia; Myeloproliferative disease. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000200608 |
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| Bellafronte,Elisangela; Schemberger,Michelle Orane; Artoni,Roberto Ferreira; Moreira Filho,Orlando; Vicari,Marcelo Ricardo. |
| Parodontidae fish show few morphological characteristics for the identification of their representatives and chromosomal analyses have provided reliable features for determining the interrelationships in this family. In this study, the chromosomes of Apareiodon hasemani from the São Francisco River basin, Brazil, were analyzed and showed a karyotype with 2n = 54 meta/submetacentric chromosomes, and a ZZ/ZW sex chromosome system. The study revealed active NORs located on pair 11 and additional 18S rDNA sites on pairs 7 and 22. The 5S rDNA locus was found in pair 14. It showed a pericentric inversion regarding the ancestral condition. The satellite DNA pPh2004 was absent in the chromosomes of A. hasemani, a shared condition with most members of Apareiodon.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cytogenetics; FISH; 18S rDNA; 5S rDNA; Neotropical fishes. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000500010 |
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| Carrara,Rita C. V.; Yamasaki,Rui; Mazucatto,Luís F.; Veludo,Maria A. Llorach; Sartorato,Edi L.; Pina-Neto,João M.. |
| Clinical and cytogenetic studies were performed in 65 infertile individuals, and 56 of them were also screened for microdeletions in Yq11 (AZF region). Relevant environmental etiological factors were identified in 10 cases (15.4%). Sertoli-cell-only syndrome was diagnosed in six patients (9,2%). Karyotype abnormalities were detected in six individuals, and five other patients presented desynapsis of bivalents in meiosis. Three out of the 56 patients studied were carriers of microdeletions in the AZF region, one of them also presenting a chromosomal mosaicism for an extra i(22p). |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Male infertility; Cytogenetics; Microdeletions; AZF; Meiotic anomalies. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000400002 |
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| Registros recuperados: 87 | |
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