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	Provedor de dados Braz. J. Genet. (109) Autor Beiguelman,Bernardo (3) Barros,Everaldo Gonçalves de (2) Carvalho,Fernando Irajá Félix de (2) Custódio,Randolfo William Silvestre (2) Fontanetti,Carmem Silvia (2) Perondini,André Luiz P. (2) Sediyama,Carlos Sigueyuki (2) Selivon,Denise (2) Vidal,Benedicto de Campos (2) Waldschmidt,Ana Maria (2) Abreu,A. de F.B. (1) Acedo,Maria Dolores P. (1) Agostini,J.M.S. (1) Alleoni,Maria R.B. (1) Almeida,Darcy F. de (1) Alzate-Marin,Ana Lilia (1) Antunes,Lusânia M.G. (1) Aragão,F. (1) Araújo,Abelardo Q.C. (1) Balan,Andrea (1) Mais... Palavra-chave Southern Brazil (2) Akodon cursor (1) AluI (1) Amazon turtle (1) Anopheles bellator (1) Anopheles cruzii (1) Argentine Creole cattle (1) At-risk groups (1) Autosomal dominant (1) BamHI (1) Blast resistance (1) Bone marrow (1) Brazilian boy (1) Breeding program (1) CHO cells (1) Cassava (1) Chinese hamster (1) Chromatid gaps (1) Chromosome (1) Chromosome 17 (1) Mais... Tipo do documento Info:eu-repo/semantics/article (75) Info:eu-repo/semantics/other (24) Ano 1997 (84) 1996 (25) País Brazil (109) Idioma Inglês (108) Português (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 109 Primeira ... 1 2 3 4 5 6 ... Última Cytogenetics of six Brazilian species of Psocoptera Braz. J. Genet. Zefa,Edison; Fontanetti,Carmem Silvia; Mesa,Alejo. The karyotypes of the following six species of Brazilian Psocoptera are reported: Caecillius sp. (Caecillidae), Triplocania ? caudata New (Ptiloneuridae), Brachinodiscus cf. lepidus (Banks) (Psocidae), Psococerastis interrupta New (Psocidae), Ptycta nr reticulata New (Psocidae) and Trichadenotecnum sinuatum New (Psocidae). All of them had males with 2n = 17 and an XO sex determining mechanism. Tipo: Info:eu-repo/semantics/article Palavras-chave: Cytogenetics; Psocoptera. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400011 Genotoxic activity of the insecticide Nuvacron (Monocrotophos) detected by the micronucleus test in bone marrow erythrocytes of mice and in CHO cells Braz. J. Genet. Peitl Jr,Paulo; Sakamoto-Nojo,Elza T.; Cólus,Ilce M. de Syllos. The organophosphorus insecticide Nuvacron (Monocrotophos) is a very toxic agent widely utilized in Brazilian agriculture. To evaluate the clastogenic potential of this insecticide, in vivo and in vitro micronucleus (MN) assay experiments were carried out on Swiss mice and on Chinese hamster ovary (CHO) cells, respectively. Nuvacron administered at doses of 2.5 and 5.0 mg/kg induced a statistically significant increase in the frequencies of MN detected in polychromatic bone marrow erythrocytes from animals (six/group) treated ip 24 h before. Exponentially growing CHAO cells were treated continuously (16h) with Nuvacron diluted in water to final concentrations of 1, 10, 100, 200, and 400 mug/ml. Three experiments were carried out using the cytokinesis-block... Tipo: Info:eu-repo/semantics/article Palavras-chave: Genotoxic; Insecticide Nuvacron; Micronucleus; Bone marrow; Erythrocytes; Mice; CHO cells. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400006 Holstein white coat color and performance: phenotypic, genetic and environmental correlations Braz. J. Genet. Becerril,Carlos M.; Wilcox,Charles J.; Guerrero,Victor M.. Correlations of measures of percentages of white coat color, five measures of production and two measures of reproduction were obtained from 4293 first lactation Holsteins from eight Florida dairy farms. Percentages of white coat color were analyzed as recorded and transformed by an extension of Box-Cox procedures. Statistical analyses were by derivative-free restricted maximum likelihood (DFREML) with an animal model. Phenotypic and genetic correlations of white percentage (not transformed) were with milk yield, 0.047 and 0.097; fat yield, 0.002 and 0.004; fat percentage, -0.047 and -0.090; protein yield, 0.024 and 0.048; protein percentage, -0.070 and -0.116; days open, -0.012 and -0.065; and calving interval, -0.007 and -0.029. Changes in magnitude of... Tipo: Info:eu-repo/semantics/article Palavras-chave: Holstein; Phenotypic; Genetic; Environmental. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400009 Reading the human Y chromosome: the emerging DNA markers and human genetic history Braz. J. Genet. Santos,Fabrício R.; Tyler-Smith,Chris. Reading the human Y chromosome: the emerging DNA markers and human genetic history. Tipo: Info:eu-repo/semantics/article Palavras-chave: Human Y chromosome; DNA markers; Human genetic history. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400025 Trisomy 13 mosaicism demonstrated only in skin fibroblasts in a patient presenting psychomotor retardation, pigmentary dysplasia and some dysmorphic features Braz. J. Genet. Ferreira,A.P.S.; Mazzucatto,L.F.; Ramos,E.S.; Pina-Neto,J.M.. A Brazilian female infant presented delayed psychomotor development, skin pigmentary dysplasia and some dysmorphic features. Chromosome analysis from peripheral blood culture was normal, but the karyotype from skin fibroblasts revealed mosaicism for trisomy 13. This case demonstrates the relevance of performing chromosomal analysis of skin fibroblasts in patients with mental retardation, associated with pigmentary dysplasia of the skin and a normal karyotype in peripheral blood lymphocytes. To our knowledge, it is the first report of trisomy 13 demonstrated only in skin fibroblasts. Tipo: Info:eu-repo/semantics/article Palavras-chave: Trisomy 13 mosaicism; Skin fibroblasts; Psychomotor retardation; Pigmentary dysplasia; Dysmorphic features. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400023 Transferrin polymorphism in Amazon turtle (Podocnemis expansa) stocks Braz. J. Genet. Teixeira,Aylton Saturnino; Jamieson,Alan; Raposo,José Carlos Paula; Vieira,Alvaro Alves. The transferrin gene locus (Tf) was investigated in five populations of the Amazon turtle (Podocnemis expansa) sampled from five geographical areas in the Amazon region. This locus was polymorphic, showing three genotypes (Tfª Tfª, Tfª Tf b and Tf b Tf b), presumably encoded by two co-dominant alleles, Tfª and Tf b. All populations showed good genetic balance according to Hardy-Weinberg expectations, and may sustain the hypothesis of a single stock in the area investigated. The data are consistent with free flow of genes among the population samples examined. Tipo: Info:eu-repo/semantics/article Palavras-chave: Polymorphism; Amazon turtle. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400004 Alternative procedures for parent choice in a breeding program for the common bean (Phaseolus vulgaris L.) Braz. J. Genet. Oliveira,L.B.; Ramalho,M.A.P.; Abreu,A. de F.B.; Ferreira,D.F.. Six common bean cultivars were crossed in diallel and the segregant populations were assessed in the F2 and F3 generations to compare methodologies for parental selection in a breeding program based on hybridization. The cultivars involved in the diallel were A 114, A 77, ESAL 686, Milionário, Carioca, and Flor de Mayo. The segregant F2 and F3 generations were assessed on the experimental campus of the Universidade Federal de Larvas, in July 1994. It was found that the cultivars differed in their general combining ability (GCA). Flor de Mayo, which belongs to the Durango race, had the largest positive GCA estimate for grain field, and the cultivars from the Mesoamerican race, Milionário and A 114, the smallest GCA estimates. For flowering, the cultivar... Tipo: Info:eu-repo/semantics/article Palavras-chave: Breeding program; Common bean. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400014 Chromosome damage in underground coal miners: detection by conventional cytogenetic techniques and by submitting lymphocytes of unexposed individuals to plasma from at-risk groups Braz. J. Genet. Agostini,J.M.S.; Otto,P.A.; Wajntal,A.. Chromosome abnormalities and the mitotic index in lymphocyte cultures and micronuclei in buccal mucosa cells were investigated in a sample of underground mineral coal miners from Southern Brazil. A decreased mitotic index, an excess of micronuclei and a higher frequency of chromosome abnormalities (fragments, polyploidy and overall chromosome alterations) were observed in the miners when compared to age-paired normal controls from the same area. An alternative assay for clastogenesis in occupational exposition was tested by submitting lymphocytes from non-exposed individuals to a pool of plasmas from the exposed population. This assay proved to be very convenient, as the lymphocytes obtained from the same individuals can be used as target as well as... Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome damage; Underground coal miners; Cytogenetic; Lymphocytes; Plasma; At-risk groups. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400021 Copper accumulation in Xanthomonas campestris pv. vesicatoria Braz. J. Genet. Ramos,Georgia Barros de A.; Rosato,Yoko B.. A strain of Xanthomonas campestris pv. vesicatoria showing resistance to 1.2 mM cupric sulfate was analyzed by atomic absorption spectroscopy and ESI (electron spectrophotometry imaging). Accumulation of copper was detected in the periphery of the cell membrane region, suggesting that the mechanism of copper resistance is similar to that previously described for Pseudomonas species. The ESI technique was used to detect copper in the membrane region. Copper-resistance in X. campestris pv. vesicatoria 484 is inducible and occurs by accumulation of the metal and not by efflux mechanism as has been suggested. The growth curve also showed that this system is inducible. Tipo: Info:eu-repo/semantics/article Palavras-chave: Copper accumulation; Xanthomonas campestris; Vesicatoria. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400002 Occurrence of Akodon cursor (Rodentia, Cricetidae) with 14, 15 and 16 chromosome cytotypes in the same geographic area in Southern Brazil Braz. J. Genet. Sbalqueiro,Ives José; Nascimento,André Paulo. The karyotype of Akodon cursor (initially identified as A. arviculoides) had been reported with chromosomal numbers 14 and 15 in the South and Southeast and 16 in Northeastern Brazil. We found the three cytotypes in a region of Southern Brazil. The G-band patterns of these specimens were the same as those from southeastern and northeastern regions. Seventeen different combinations of chromosomes due to a complex rearrangement in pair 1 and pericentric inversions in pairs 2 and 3 were identified. Seven of these combinations are new to in the literature. Tipo: Info:eu-repo/semantics/article Palavras-chave: Akodon cursor; Chromosome cytotypes; Southern Brazil. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400005 Use of RAPD-PCR to identify true hybrid plants from crosses between closely related progenitors Braz. J. Genet. Alzate-Marin,Ana Lilia; Baía,Gilson Soares; Martins Filho,Sebastião; Paula Júnior,Trazilbo José de; Sediyama,Carlos Sigueyuki; Barros,Everaldo Gonçalves de; Moreira,Maurilio Alves. RAPD-PCR molecular markers were used to identify common bean and soybean hybrid plants derived from crosses between closely related progenitors, with no apparent phenotypic differences. Primers OP-F12 and OP-0O3 were used to identify true hybrids derived from crosses between common bean cultivars Rudá (A 285) and AN 910408, and soybean cultivars Cristalina and Bossier, respectively. Each primer generated one polymorphic DNA band which was present in the male progenitor and absent in the female progenitor. As RAPD bands are normally inherited as dominant characters, the presence of these bands in the F1 plants confirmed their status. Tipo: Info:eu-repo/semantics/article Palavras-chave: RAPD-PCR; Hybrid plants; Progenitors. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400016 A simple model for the estimation of congenital malformation frequency in racially mixed populations Braz. J. Genet. Lopez-Camelo,J.S.; Cabello,P.H.; Dutra,M.G.. A simple model is proposed, using the method of maximum likelihood to estimate malformation frequencies in racial groups based on data obtained from hospital services. This model uses the proportions of racial admixture, and the observed malformation frequency. It was applied to two defects: postaxial polydactyly and cleft lip, the frequencies of which are recognizedly heterogeneous among racial groups. The frequencies estimated in each racial group were those expected for these malformations, which proves the applicability of the method. Tipo: Info:eu-repo/semantics/article Palavras-chave: Congenital malformation; Racially mixed populations. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400024 TP53 mutations and loss of heterozygosity of chromosome 17 in colorectal tumors Braz. J. Genet. Yamamoto,Lidia; Lopes,Ademar A.; Harb-Gama,Angelito; Nagai,Maria A.. The incidence of TP53 point mutations and loss of heterozygosity (LOH) of chromosome 17 in colorectal tumors was determined in a group of Brazilian patients. We screened DNA samples from tumors and distal normal mucosa of 39 patients with colorectal cancer, for TP53 mutations by PCR-SSCP (single-strand conformation polymorphism) analysis. Chromosome 17 LOH was investigated using six PCR-based polymorphic markers and one VNTR probe. TP53 mutations were demonstrated in 15/39 of the cases. Mutations were distributed among all exons examined (five to eight), the majority of them being G/C to A/T transitions. LOH of chromosome 17p and 17q was detected in 70 and 46% of the tumors, respectively. There was a significant association between TP53 mutations and LOH... Tipo: Info:eu-repo/semantics/article Palavras-chave: TP53 mutations; Heterozygosity; Chromosome 17; Colorectal tumors. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400022 Townes-Brocks syndrome or hemifacial microsomia-VACTERL phenotype? Braz. J. Genet. Roth,Maria da Graça Martino; Garcias,Gilberto de Lima; Ferreira,Fátima Lassalete Soares. We report a male with imperforate anus, pedunculated triphalangeal thumbs, hemifacial microsomia, microtia, preauricular tags and cardiac anomalies. This is the first individual with Townes-Brocks syndrome to have hydrocephalus. Tipo: Info:eu-repo/semantics/article Palavras-chave: Townes-Brocks; Hemifacial; Microsomia-VACTERL. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400018 Inheritance of blast resistance in rice to two Pyricularia grisea races, IB-1 and IB-9 Braz. J. Genet. Filippi,Marta C. de; Prabhu,A.S.. Seven sources of resistance to the two predominant races IB-1 and IB-9 of the rice blast pathogen Pyricularia grisea were selected based on leaf blast reaction in tests conducted under controlled greenhouse conditions. Crosses involving resistant and susceptible parents were made to study the inheritance of the disease reaction for different sources of resistance. The F1 and F2 progenies of all crosses, including backcrosses to resistant and susceptible parents, were tested for reaction to leaf blast. The data showed that resistance is controlled by one to three genes that segregate independently in most of the donors. Non-allelic interaction among resistance genes, including dominant epistasis, was identified. Tipo: Info:eu-repo/semantics/article Palavras-chave: Blast resistance; Rice; Pyricularia grisea. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400012 Odonto-ungueal dysplasia: an apparently new autosomal dominant ectodermal dysplasia Braz. J. Genet. Pinheiro,Marta; Freire-Maia,Newton. We describe 27 subjects (11 women) from five generations of a family with an apparently hitherto undescribed ectodermal dysplasia. All of them presented dental and/or nail alterations only. A genetic analysis of the family suggests an autosomal dominant gene. Differential diagnosis considered eight conditions belonging to the same odonto-onychic (2-3) subgroup, as well as Fried's tooth and nail syndrome and hypodontia and nail dysgenesis (both in 1-2-3 subgroup). Tipo: Info:eu-repo/semantics/article Palavras-chave: Odonto-ungueal dysplasia; Autosomal dominant; Ectodermal dysplasia. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400019 Maternal age and Down syndrome in Southeastern Brazil Braz. J. Genet. Beiguelman,Bernardo; Krieger,Henrique; Silva,Luciana Marques da. The proportion of maternal-age-independent patients estimated among 200 Brazilian Down syndrome children (59.6%) was significantly larger than that of maternal-age-dependent cases (40.4%). The latter proportion is the smallest observed in pertinent literature and due basically to the low mean maternal age of the population analyzed. Based on the remarkable correlation (r = 0.95) between the proportion of maternal-age-dependent patients and the mean maternal age of the general population, a simple predictive equation to estimate the proportion of maternal-age-dependent Down syndrome patients based on the mean maternal age of the general population is suggested in situations where reliable data on the incidence of this syndrome according to maternal age is... Tipo: Info:eu-repo/semantics/article Palavras-chave: Maternal age; Down syndrome; Southeastern Brazil. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400020 Microphotometric scanning of chromatid gaps and breaks induced by AluI and BamHI in Chinese hamster ovary cells Braz. J. Genet. Martínez-López,Wilner; Bonomi,Rossana; Folle,Gustavo A.; Drets,Máximo E.. Chromatid gaps and breaks induced by the restriction endonucleases AluI and BamHI in the long arm of chromosome 1 of Chinese hamster ovary cells were microphotometrically scanned and mapped to a quantitative G-band map. More than 50% of chromatid breaks appeared as chromatin losses of greater than 5% of the total arm length. The majority of chromatid gaps and breaks as well as chromatin losses induced by both restriction endonucleases were non-randomly located in a region from 0.35 to 0.65 relative length units of the long arm of chromosome 1. We suggest that the access of these endonucleases to chromosomal DNA depends on the local organization of the chromatin. Tipo: Info:eu-repo/semantics/article Palavras-chave: Microphotometric scanning; Chromatid gaps; AluI; BamHI; Chinese hamster; Ovary cells. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400007 Chromosome studies in some Stevia. Cav. (Compositae) species from Southern Brazil Braz. J. Genet. Frederico,Adriana P.; Ruas,Paulo M.; Marin-Morales,Maria A.; Ruas,Claudete F.; Nakajima,Jimi N.. Karyotypes of six species of the genus Stevia from Southern Brazil were studied, utilizing root tip metaphases. All species were diploid with 2n = 22 chromosomes. It was possible to identify each species by chromosome morphology. The basic chromosome number for Brazilian species of Stevia is X = 11. This number is also found in almost all South American species. We suggest that in Stevia there is an evolutionary trend toward chromosomal rearrangement, caused mainly by pericentric inversions. It was found that, in addition to aneuploidy and polyploidy, chromosomal rearrangements are common in the tribe Eupatorieae. Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome; Stevia. Cav.; Southern Brazil. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400013 The polytene chromosomes of the mosquito Anopheles bellator compared with those of Anopheles cruzii Braz. J. Genet. Ramirez,Corolla C.L.; Dessen,Eliana M.B.. A photographic map was made of polytene chromosomes of ovarian nurse cells of Anopheles bellator females. The chromosomes of this species have complete or partial homology with those of A. cruzii, mainly in the telomeric and centromeric regions. Variability at the single band level was observed as asymmetric bands at seven different positions. One inversion (3Ra) was detected in the 3R arm. Tipo: Info:eu-repo/semantics/article Palavras-chave: Polytene chromosomes; Mosquito; Anopheles bellator; Anopheles cruzii. Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400003 Registros recuperados: 109 Primeira ... 1 2 3 4 5 6 ... Última

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