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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
28/03/2005 |
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Data da última atualização: |
28/03/2005 |
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Autoria: |
MORENO, R. M. B.; MEDEIROS, E. S.; FERREIRA, F. C.; ALVES, N.; GONÇALVES, P. S.; MATTOSO, L. H. C. |
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Título: |
Estudo da cinética de decomposição de quatro clones de seringueira utilizando o método de ozawa. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE POLÍMEROS. 7., nov. 2003., Belo Horizonte, MG. Anais... São Carlos: Associação Brasileira de Polímeros, 2003. p. 1007-1008. |
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Idioma: |
Português |
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Conteúdo: |
Thermal degradation behavior of rubber from four rubber clones (RRIM 600, PB 235, GT1 and IAN 873) of the Hevea brasiliensis species was studied by thermogravimetry (TG) using Ozawa?s approach to assess the kinetic parameters of the decomposition process. The order of reaction follows zero-order kinetic at the beginning and the end of the degradation process, and first order at intermediate stages. Activation energy were determined to be dependent on the degree of conversion and clone used ragging from 148 to 236kJ/mol. These values indicated that the thermal behavior of natural rubber depends on the type of clones studied. Rubber from clones IAN 873, GT1 and RRIM 600 presented the best overall thermal stability whereas the clone PB 235 presented a lower thermal stability than for any other clone studied. |
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Palavras-Chave: |
Comportamento térmico; Polímeros. |
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Thesagro: |
Latex. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01545naa a2200217 a 4500
001 1028867
005 2005-03-28
008 2003 bl --- 0-- u #d
100 1 $aMORENO, R. M. B.
245 $aEstudo da cinética de decomposição de quatro clones de seringueira utilizando o método de ozawa.
260 $c2003
520 $aThermal degradation behavior of rubber from four rubber clones (RRIM 600, PB 235, GT1 and IAN 873) of the Hevea brasiliensis species was studied by thermogravimetry (TG) using Ozawa?s approach to assess the kinetic parameters of the decomposition process. The order of reaction follows zero-order kinetic at the beginning and the end of the degradation process, and first order at intermediate stages. Activation energy were determined to be dependent on the degree of conversion and clone used ragging from 148 to 236kJ/mol. These values indicated that the thermal behavior of natural rubber depends on the type of clones studied. Rubber from clones IAN 873, GT1 and RRIM 600 presented the best overall thermal stability whereas the clone PB 235 presented a lower thermal stability than for any other clone studied.
650 $aLatex
653 $aComportamento térmico
653 $aPolímeros
700 1 $aMEDEIROS, E. S.
700 1 $aFERREIRA, F. C.
700 1 $aALVES, N.
700 1 $aGONÇALVES, P. S.
700 1 $aMATTOSO, L. H. C.
773 $tIn: CONGRESSO BRASILEIRO DE POLÍMEROS. 7., nov. 2003., Belo Horizonte, MG. Anais... São Carlos: Associação Brasileira de Polímeros, 2003. p. 1007-1008.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Biblioteca |
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Registro |
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Voltar
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
08/06/2009 |
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Data da última atualização: |
26/08/2010 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 2 |
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Autoria: |
FALEIRO, F. G.; PINTO, A. C. Q.; CORDEIRO, M. C. R.; ANDRADE, S. R. M.; RAMOS, V. H. V.; BELLON, G.; DIAS, J. N. |
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Afiliação: |
Fábio Gelape Faleiro, CPAC; Alberto Carlos Queiroz Pinto; Maria Cristina Rocha Cordeiro, CPAC; Solange Rocha Monteiro Andrade, CPAC; Victor Hugo Vargas Ramos; Graciele Bellon; J. N. Dias. |
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Título: |
Genetic variability of mango cultivars developed by Embrapa Cerrados breeding program using RAPD markers. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Acta Horticulturae, Leuven, n. 820, p. 177-181, abr. 2009. |
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Idioma: |
Inglês |
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Notas: |
Edição do Proceedings of the 8 International Mango Symposium, Sun City, South Africa, Abril, 2009. |
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Conteúdo: |
The Brazilian mango commercial production is highly concentrated on USA cultivar Tommy Atkins. Embrapa Cerrados has been working on mango breeding program through intervarietal hybridization to develop cultivars adapted to the Savanna and Northeast Brazilian region conditions. The objective of this work was to evaluate the genetic variability of Alfa, Roxa, Beta and Lita mango cultivars developed by Embrapa Cerrados breeding program. USA cultivars Tommy Atkins, Haden, Palmer and Keitt were used as control. The genomic DNA of each cultivar was extracted and amplified using 21 decamer primers to obtain RAPD molecular markers. The markers were transformed into a binary matrix data to estimate genetic distances among varieties and to perform cluster analysis. It was obtained 306 molecular markers, from which 66,3% were polymorphic. The genetic distances among USA cultivars ranged from 0,101 to 0,237 and among Brazilian cultivars ranged from 0,114 and 0,238. The lowest genetic distance was detected between cultivars Tommy Atkins and Keitt (0,101). Cluster analysis showed a very close group of the Tommy Atkins, Palmer and Keitt cultivars. These results emphasize the importance of the Brazilian mango cultivars as alternative to enlarge the genetic base of the cultivars commercially grown in Brazil. |
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Thesagro: |
DNA; Manga; Mangifera Indica; Marcador Molecular. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02115naa a2200253 a 4500
001 1558233
005 2010-08-26
008 2009 bl uuuu u00u1 u #d
100 1 $aFALEIRO, F. G.
245 $aGenetic variability of mango cultivars developed by Embrapa Cerrados breeding program using RAPD markers.
260 $c2009
500 $aEdição do Proceedings of the 8 International Mango Symposium, Sun City, South Africa, Abril, 2009.
520 $aThe Brazilian mango commercial production is highly concentrated on USA cultivar Tommy Atkins. Embrapa Cerrados has been working on mango breeding program through intervarietal hybridization to develop cultivars adapted to the Savanna and Northeast Brazilian region conditions. The objective of this work was to evaluate the genetic variability of Alfa, Roxa, Beta and Lita mango cultivars developed by Embrapa Cerrados breeding program. USA cultivars Tommy Atkins, Haden, Palmer and Keitt were used as control. The genomic DNA of each cultivar was extracted and amplified using 21 decamer primers to obtain RAPD molecular markers. The markers were transformed into a binary matrix data to estimate genetic distances among varieties and to perform cluster analysis. It was obtained 306 molecular markers, from which 66,3% were polymorphic. The genetic distances among USA cultivars ranged from 0,101 to 0,237 and among Brazilian cultivars ranged from 0,114 and 0,238. The lowest genetic distance was detected between cultivars Tommy Atkins and Keitt (0,101). Cluster analysis showed a very close group of the Tommy Atkins, Palmer and Keitt cultivars. These results emphasize the importance of the Brazilian mango cultivars as alternative to enlarge the genetic base of the cultivars commercially grown in Brazil.
650 $aDNA
650 $aManga
650 $aMangifera Indica
650 $aMarcador Molecular
700 1 $aPINTO, A. C. Q.
700 1 $aCORDEIRO, M. C. R.
700 1 $aANDRADE, S. R. M.
700 1 $aRAMOS, V. H. V.
700 1 $aBELLON, G.
700 1 $aDIAS, J. N.
773 $tActa Horticulturae, Leuven$gn. 820, p. 177-181, abr. 2009.
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Embrapa Cerrados (CPAC) |
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