oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 591 )

2018 ( 819 )

2017 ( 752 )

2016 ( 1106 )

Custom range...

Search Results: 1 - 10 of 462525 matches for " átila Bento Beleti;Gouvêa "
All listed articles are free for downloading (OA Articles)
Page 1 /462525
Display every page Item
Age-age correlation for early selection of rubber tree genotypes in S?o Paulo State, Brazil
Gon?alves, Paulo de Souza;Bortoletto, Nelson;Cardinal, átila Bento Beleti;Gouvêa, Lígia Regina Lima;Costa, Reginaldo Brito da;Moraes, Mário Luiz Teixeira de;
Genetics and Molecular Biology , 2005, DOI: 10.1590/S1415-47572005000500018
Abstract: in a field trial involving 68 rubber tree (hevea spp.) clones calculation of genotypic correlation coefficients revealed significant age-age correlation from age 1 to 6 (immature period) for girth a and for age 7 to 12 (mature period) for girth b and for age 7 to 12 (production of latex) for yield. rank correlation coefficients between all immature ages of girth (girth a), all ages of mature girth (girth b) and all annual rubber production (yield) were significant for the three traits, with the coefficients decreasing with increasing age. selection of the sets of best 30, 15, 10 and 5 clones from the available 68 clones at a given age was generally accompanied by a descending order of percentage success. it was suggested: (a) to have the best 30 clones of age 6, select the set of best 36 clones at age 2, (b) to have the best 15 clones of age 6, select the set of best 20 clones at age 3, (c) to have the best 5 clones of age 6, select the set of best 8 clones at age 4, and (d) to have the best 3 clones of age 6, select the set of best 3 clones at age 5. more than 80% of the targeted clones on girth a or girth b basis and more than 76.7% clones on yield basis were found to get selected at steps (a) through (d). for achieving early multiplication of the most productive clone for deployment, multiplication should be started with the best 36 (i.e. 60%) clones selected at age 2.
Genetic variability and selection for laticiferous system characters in Hevea brasiliensis
Gon?alves, Paulo de Souza;Cardinal, átila Bento Beleti;Costa, Reginaldo Brito da;Bortoletto, Nelson;Gouvêa, Lígia Regina Lima;
Genetics and Molecular Biology , 2005, DOI: 10.1590/S1415-47572005000300014
Abstract: six laticiferous system characters were investigated in 22 three-year-old, half-sib rubber tree [hevea brasiliensis (willd. ex adr. de juss.) muell.-arg.] progenies, evaluated at three sites (votuporanga, pindorama and jaú, all in the s?o paulo state, brazil). the traits examined were: average rubber yield (pp), average bark thickness (bt), number of latex vessel rings (lv), average distance between consecutive latex vessel rings (dc), density of latex vessels per 5 mm per ring averaged over all rings (dd) and the diameter of the latex vessels (di). the joint analysis showed that site effect and progeny x sites interaction were significant for all traits, except lv. estimates of individual heritabilities across the three sites were high for bt; moderate for lv, pp and dc; low for dd and very low for di. genetic correlations in the joint analysis showed high positive correlations between pp and the other traits. selecting the best five progenies would result in genetic gains of 24.91% for pp while selecting best two plants within a progeny would result in a pp genetic gain of 30.98%.
Influência de seis porta-enxertos sobre a produ??o de clones superiores de seringueira
Cardinal, átila Bento Beleti;Gon?alves, Paulo de Souza;Martins, Ant?nio Lúcio Mello;
Bragantia , 2007, DOI: 10.1590/S0006-87052007000200011
Abstract: in the rubber tree cultivation [hevea brasiliensis (willd. ex adr. de juss.) muell.-arg.], the most used propagation method is budding. the expected uniformity by using vegetative propagation is however not verified in fields commercial, because high variation for vigour and yield traits are induced by the rootstocks used. based on this issue and on the economical importance of the rubber tree in s?o paulo state, this study had as main objective the indication of the best combination of clones and rootstocks for planting in the state, aiming at high vigour and productivity. analysed data were five years of dry rubber yield from an experiment in split-plot design with four replications, conducted at pindorama (sp). treatments comprised 36 different combinations, subjected to analysis of variance and mean comparions of six rootsocks and six scions. it was observed strong effects of rootstock over the anylised variables, as well as differential behaviour among the tested combinations. it was concluded that, pb 235, gt 1 and ian 873 induced the largest yields, and should be recommended to the conditions of planalto paulista; the use of unselected seedlings (sns) as rootstocks is not recommended as it showed very low yields when compared to selected rootstock seedlings.
Stock-scion interactions on growth and rubber yield of Hevea brasiliensis
Cardinal, átila Bento Beleti;Gon?alves, Paulo de Souza;Martins, Ant?nio Lúcio Mello;
Scientia Agricola , 2007, DOI: 10.1590/S0103-90162007000300004
Abstract: rubber tree cultivation [hevea brasiliensis (willd. ex adr. de juss.) muell.-arg.] uses mostly the budding propagation method, however the expected stand uniformity due to the use of vegetative propagation is theoretical, since high variation for yield and vigor is caused by rootstock influence. the objective of this study was to assess several combinations between clonal rootstocks and clone scions through diallel analysis, aiming at high productivity and vigor. data consisted of five years of dry rubber yield and girth at panel opening from an experiment using a split-plot design with four replications, conducted at pindorama, sp, brazil, considering six rootstocks (gt 1, ian 873, pb 235, rrim 600, rrim 701 and unselected seedlings) and six scions (gt 1, ian 873, pb 235, pr 107, rrim 600 and rrim 701). a 6 ′ 6 partial diallel analysis summing up 36 combinations was undertaken, and general compatibility for each group of materials (rootstocks and scions) and specific compatibility among all combinations were estimated. the results have shown that pb 235 and ian 873 rootstocks provided high yields and general compatibility values (7.9348 and 2.7647, respectively). the use of unselected seedlings as rootstocks is not recommended because they presented very low compatibility values for dry rubber yield. towards growth vigor, the tested rootstocks have shown similar performance.
Genetic variability and selection for laticiferous system characters in Hevea brasiliensis
Gon?alves Paulo de Souza,Cardinal átila Bento Beleti,Costa Reginaldo Brito da,Bortoletto Nelson
Genetics and Molecular Biology , 2005,
Abstract: Six laticiferous system characters were investigated in 22 three-year-old, half-sib rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg.] progenies, evaluated at three sites (Votuporanga, Pindorama and Jaú, all in the S o Paulo State, Brazil). The traits examined were: average rubber yield (Pp), average bark thickness (Bt), number of latex vessel rings (Lv), average distance between consecutive latex vessel rings (Dc), density of latex vessels per 5 mm per ring averaged over all rings (Dd) and the diameter of the latex vessels (Di). The joint analysis showed that site effect and progeny x sites interaction were significant for all traits, except Lv. Estimates of individual heritabilities across the three sites were high for Bt; moderate for Lv, Pp and Dc; low for Dd and very low for Di. Genetic correlations in the joint analysis showed high positive correlations between Pp and the other traits. Selecting the best five progenies would result in genetic gains of 24.91% for Pp while selecting best two plants within a progeny would result in a Pp genetic gain of 30.98%.
Influência das energias de superfícies e interfaces na densifica??o durante a sinteriza??o: um modelo geométrico
Gouvêa, D.;
Ceramica , 2004, DOI: 10.1590/S0366-69132004000200003
Abstract: sintering is a diffusional process and the mechanism of mass transport is assumed to control the phenomenon. minor attention has been paid on the influence of surface and interface energies during sintering. even if some works have tried to understand the influence of the modifications of the pore and grain boundary surfaces in the densification during sintering and their relationships with the difusional process, modest progresses have been reached. this work was developed from a simple model of packing spheres, allowing for calculating simultaneously the variation of pore, grain boundary and density for three situations: densification without grain growth, grain growth without densification and grain growth with densification. the results suggest a relationship between the microestrutural evolution during sintering with or without densification and the ratio of the surface energies of the grain boundary and the pores.
Retour sur les pratiques : rapport de stage et planification de formation
Eliane Gouvêa Lousada
Synergies Brésil , 2009,
Abstract: A partir d’une analyse d’un rapport de stage écrit par une étudiante à propos de sa première expérience en tant qu’enseignante, cet article se propose de lancer une réflexion sur les contenus d’enseignement souvent abordés dans les cours de didactique,. Il s’agit, en réalité, de se demander si un cours de didactique du FLS, au niveau du master, est capable de préparer l’étudiant(e) à son futur métier. Pour atteindre cet objectif, on abordera d’abord quelques théories qui tentent de caractériser le métier de professeur et les différentes dimensions du travail enseignant. Puis, on se demandera si les rapports de stage peuvent contribuer à mieux planifier la formation et s’ils ont un r le à jouer dans le développement des futurs enseignants.
Plato's Ghost: The Modernist Transformation of Mathematics
Fernando Q. Gouvêa
Aestimatio : Critical Reviews in the History of Science , 2009,
Abstract:
Sherlock Holmes in Babylon and Other Tales of Mathematical History edited by Marlow Anderson, Victor Katz, and Robin Wilson
Fernando Q. Gouvêa
Aestimatio : Critical Reviews in the History of Science , 2005,
Abstract:
Práticas de ensinar a distancia mediadas por ambiente virtual / Las prácticas de la ense anza a distancia mediadas por medios virtuales
Guaracira Gouvêa
Reflex?o & A??o , 2008,
Abstract: Atualmente, a existência de discursos expressos nas leis educacionais e em parte da produ o acadêmica contemporanea, colocando as tecnologias como relevantes e necessárias aos processoseducacionais, exige, antes de qualquer filia o, um exame crítico das quest es que envolvem as rela es que se estabelecem entre sujeitos em práticas educativas nas quais as tecnologias de informa o e comunica o (TICs) se fazem presentes. No caso deste estudo, estou interessada em discutir como os professores conduzem sua prática quando prop em situa es didáticas mediadas por uma plataforma, em um contexto de disciplinas de um curso presencial, ministradas parcialmente a distancia. Para tal, optei por estudar a implanta o de módulos baseados em EaD em disciplinas de curso de gradua o em Pedagogia de uma universidade pública e realizar acompanhamento dosmomentos a distancia Neste trabalho, considero como ferramentas metodológicas a observa o participante das reuni es de prepara o da implanta o das disciplinas, as grava es em áudio dessas reuni es; o caderno de registros do professor da disciplina onde todas as ocorrências eram anotadas, inclusive as associadas à plataforma. A análise realizada indica que o ato de elabora o do materialdidático para ser disponibilizado na plataforma fez surgir quest es que envolvem a escolha da plataforma e dos procedimentos didáticos e que estes e o desenho da plataforma descaracterizaram o uso dos meios digitais, pois os parametros espa os-temporais foram fixados e a linguagem multimídia e formas de comunica o diferenciadas n o foram utilizadas. Abstract Actualmente, la existencia de los discursos, se expresa en las leyes educacionales y en parte de la producción académica contemporánea, poniendo las tecnologías como pertinentes y necesarias para el proceso educativo, requiere, antes de cualquier adhesión, un examen crítico de las cuestiones queafectan a las relaciones establecidas entre personas en prácticas educativas, en las que la información y las tecnologías de la comunicación (TIC) están presentes. En el caso de nuestro estudio, estamos interesados en debatir sobre cómo los profesores conduzen sus prácticas al proponer situaciones de ense anza mediadas por una plataforma, en un contexto de las disciplinas de un curso presencial, con parte a distancia. Con este fin, hemos decidido establecer módulos sobre la base de EaD en las disciplinas del curso de postgrado en pedagogía de una universidad pública, y llevar a cabo laobservación de las partes a distancia. En este trabajo, consideramos como herramientas metodológicas a l
Page 1 /462525
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.