Luiz Gonzaga - Academia.edu (original) (raw)
Papers by Luiz Gonzaga
Neste artigo, apresentamos os resultados de um estudo que teve como objetivo analisar os procedim... more Neste artigo, apresentamos os resultados de um estudo que teve como objetivo analisar os procedimentos usados por alunos de 2o ano do Ensino Medio ao resolverem problemas sobre equacoes lineares com o uso de uma Ficha de Resolucao de Problemas que envolve as fases de Entrada, Ataque e Revisao propostas por Mason, Burton e Stacey. Os dados coletados foram analisados a luz dos Tres Mundos da Matematica de David Tall. Os resultados evidenciam que a Ficha colaborou para que os participantes compreendessem melhor os problemas e encontrassem solucoes satisfatorias. Por outro lado, eles ainda utilizaram representacao algebrica de maneira inadequada.
Journal of the Brazilian …, 1998
O estudo fitoquímico de Himatanthus articulata (Vahl) Woodson permitiu o isolamento e identificaç... more O estudo fitoquímico de Himatanthus articulata (Vahl) Woodson permitiu o isolamento e identificação de estigmasterol, sitosterol, cicloartenol, 3β-cinamato de α-amirina + 3β-cinamato de β-amirina, 3β-acetato de α-amirina, 3β-acetato de β-amirina, 3β-cinamato de lupeol, 3β-acetato de lupeol, ácido ursólico, metilmioinositol, ácido 1β-O-β-D-glucopiranosilplumérico, 1β-O-β-D-glucopiranosilplumerídio, plumericina e isoplumericina. Essas substâncias e alguns derivados foram identificados com base na análise dos espectros de IV, EMIE e RMN de 1 H e 13 C. Chemical investigation of Himatanthus articulata (Vahl) Woodson led to the isolation of stigmasterol, sitosterol, cycloartenol, α-amyrin-3β-O-cinnamoyl, β-amyrin-3β-O-cinnamoyl, lupeol-3β-O-cinnamoyl, α-amirin-3β-O-acetyl, β-amirin-3β-O-acetyl, lupeol-3β-O-acetyl, ursolic acid, methylmyoinositol, 1β-O-β-D-glucopyranosylplumeric acid, plumeride-1β-O-β-D-glucopyranosyl, plumericin and isoplumericin. Spectroscopic analysis (IR, 1 H, 13 C-NMR and MS) were used for the identification of these compounds and some derivatives.
Russet-mantled Foliage-gleaner is an extremely poorly known species, the range of which is center... more Russet-mantled Foliage-gleaner is an extremely poorly known species, the range of which is centered in the Brazilian Cerrado, where it inhabits riparian forests. Two subspecies are recognized, but the limits of their ranges are controversial. Furthermore, it was recently suggested that the species is one of the few in the family Furnariidae to show sexual dichromatism. In this paper we examined the plumage coloration and morphometrics of 33 study skins (85% of the available specimens). We conclude that the geographic variation and sexual dichromatism reported for S. dimidiata originated from misinterpretation of the plumage variation observed in this species, which is best considered monotypic. We also present natural history data on Russet-mantled Foliage-gleaners and suggest considering it a globally Vulnerable species.
Neste artigo, apresentamos os resultados de um estudo que teve como objetivo analisar os procedim... more Neste artigo, apresentamos os resultados de um estudo que teve como objetivo analisar os procedimentos usados por alunos de 2o ano do Ensino Medio ao resolverem problemas sobre equacoes lineares com o uso de uma Ficha de Resolucao de Problemas que envolve as fases de Entrada, Ataque e Revisao propostas por Mason, Burton e Stacey. Os dados coletados foram analisados a luz dos Tres Mundos da Matematica de David Tall. Os resultados evidenciam que a Ficha colaborou para que os participantes compreendessem melhor os problemas e encontrassem solucoes satisfatorias. Por outro lado, eles ainda utilizaram representacao algebrica de maneira inadequada.
Journal of the Brazilian …, 1998
O estudo fitoquímico de Himatanthus articulata (Vahl) Woodson permitiu o isolamento e identificaç... more O estudo fitoquímico de Himatanthus articulata (Vahl) Woodson permitiu o isolamento e identificação de estigmasterol, sitosterol, cicloartenol, 3β-cinamato de α-amirina + 3β-cinamato de β-amirina, 3β-acetato de α-amirina, 3β-acetato de β-amirina, 3β-cinamato de lupeol, 3β-acetato de lupeol, ácido ursólico, metilmioinositol, ácido 1β-O-β-D-glucopiranosilplumérico, 1β-O-β-D-glucopiranosilplumerídio, plumericina e isoplumericina. Essas substâncias e alguns derivados foram identificados com base na análise dos espectros de IV, EMIE e RMN de 1 H e 13 C. Chemical investigation of Himatanthus articulata (Vahl) Woodson led to the isolation of stigmasterol, sitosterol, cycloartenol, α-amyrin-3β-O-cinnamoyl, β-amyrin-3β-O-cinnamoyl, lupeol-3β-O-cinnamoyl, α-amirin-3β-O-acetyl, β-amirin-3β-O-acetyl, lupeol-3β-O-acetyl, ursolic acid, methylmyoinositol, 1β-O-β-D-glucopyranosylplumeric acid, plumeride-1β-O-β-D-glucopyranosyl, plumericin and isoplumericin. Spectroscopic analysis (IR, 1 H, 13 C-NMR and MS) were used for the identification of these compounds and some derivatives.
Russet-mantled Foliage-gleaner is an extremely poorly known species, the range of which is center... more Russet-mantled Foliage-gleaner is an extremely poorly known species, the range of which is centered in the Brazilian Cerrado, where it inhabits riparian forests. Two subspecies are recognized, but the limits of their ranges are controversial. Furthermore, it was recently suggested that the species is one of the few in the family Furnariidae to show sexual dichromatism. In this paper we examined the plumage coloration and morphometrics of 33 study skins (85% of the available specimens). We conclude that the geographic variation and sexual dichromatism reported for S. dimidiata originated from misinterpretation of the plumage variation observed in this species, which is best considered monotypic. We also present natural history data on Russet-mantled Foliage-gleaners and suggest considering it a globally Vulnerable species.