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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
06/04/2005 |
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Data da última atualização: |
06/04/2005 |
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Autoria: |
MARTINS, M. A.; FORATO, L. A.; COLNAGO, L. A.; MATTOSO, L. H. C. |
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Título: |
Study of chemically modified sisal fibers by 13C high resolution solid state NMR. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
In: ENCONTRO LUSO-BRASILEIRO DE RMN, 2. set. 2003, Sintra, Portugal. Posters... Sintra, 2003. Ref. MS-P56. |
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Idioma: |
Inglês |
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Conteúdo: |
NMR is a versatile technique to study new materiaIs. It has been extensivelr employed to study the three major components of lignocellulosic materiais. However, literature shows few works applying NMR techniques for characterizing of chemical treatment on natural fibers. The solid-state 13C NMR in high resolution, CP-MAS (Cross Polarization Magic Angle Spinning) has proven to be invaluable to study complex organic solids. This approach renders the question of solubility irrelevant and eliminates the structural uncertainties associated with the dissolution processo Such CP-MAS technique permits detailed analysis of a complex organic solid in its natural state2. Among natural fibers, sisal is especially important due to its physico-chemical and mechanical properties, and the use this fiber as a reinforcement in composites has raised great interest3. Sisal is a hard fiber extracted from the leaves of the planto A sisal plant produces roughly 200-250 leaves, each containing 1000-1200 fibers. The length and diameter offiber are between 1.0-1.5 m, and 100-300 ~m, respectively3. |
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Palavras-Chave: |
Fibras; RMN. |
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Thesagro: |
Sisal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01660naa a2200193 a 4500
001 1028927
005 2005-04-06
008 2003 bl --- 0-- u #d
100 1 $aMARTINS, M. A.
245 $aStudy of chemically modified sisal fibers by 13C high resolution solid state NMR.
260 $c2003
520 $aNMR is a versatile technique to study new materiaIs. It has been extensivelr employed to study the three major components of lignocellulosic materiais. However, literature shows few works applying NMR techniques for characterizing of chemical treatment on natural fibers. The solid-state 13C NMR in high resolution, CP-MAS (Cross Polarization Magic Angle Spinning) has proven to be invaluable to study complex organic solids. This approach renders the question of solubility irrelevant and eliminates the structural uncertainties associated with the dissolution processo Such CP-MAS technique permits detailed analysis of a complex organic solid in its natural state2. Among natural fibers, sisal is especially important due to its physico-chemical and mechanical properties, and the use this fiber as a reinforcement in composites has raised great interest3. Sisal is a hard fiber extracted from the leaves of the planto A sisal plant produces roughly 200-250 leaves, each containing 1000-1200 fibers. The length and diameter offiber are between 1.0-1.5 m, and 100-300 ~m, respectively3.
650 $aSisal
653 $aFibras
653 $aRMN
700 1 $aFORATO, L. A.
700 1 $aCOLNAGO, L. A.
700 1 $aMATTOSO, L. H. C.
773 $tIn: ENCONTRO LUSO-BRASILEIRO DE RMN, 2. set. 2003, Sintra, Portugal. Posters... Sintra, 2003. Ref. MS-P56.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Mandioca e Fruticultura. Para informações adicionais entre em contato com cnpmf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
10/01/2008 |
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Data da última atualização: |
29/01/2008 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Circulação/Nível: |
-- - -- |
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Autoria: |
ALVES, A. A. C.; FARIAS, A. R. N.; DITA, M. A.; SILVA, A. F.; BELLOTTI, A. C.; FREGENE, M. A. |
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Afiliação: |
Alfredo Augusto Cunha Alves, CNPMF; Alba Rejane Nunes Farias, CNPMF; Miguel Angel Dita, CNPMF; Alineaurea F. Silva; Anthony C. Bellotti; Martin A. Fregene. |
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Título: |
Evaluation of cassava interspecific hybrids for resistance to pest and diseases in the different enviroments of Brazil. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
In: ANNUAL RESEARCH MEETING, 2007, Benoni. Poster Abstrcts...Benoni: Generation Challenge Programme - CGIAR, 2007. |
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Idioma: |
Inglês |
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Conteúdo: |
Cassava interspecific hybrids were evaluated for pest and disease resistance in diferent enviroments of Brazil. Experiments were established in São Miguel das Matas (SMM), Tancredo Neves (TN), Cruz das Almas (CA) in the Bahia State and in Petrolina (PT), in the Pernambuco State. SMM, TN and CA are caracterized as subhumid enviroments with differrent annual average rainfall varing from 1000 to 1800 mm and PT is representative of the semi-arid (around 560 mm). Evaluations were performed every month starting 6 months after plantation (MAP) to 12 MAP. In all the places, the most relevant pest were cassava green mite (Mononychellus tanajoa) and cassava mealy bug (Phenacoccus manihoti), respectively, with the highest incidence in PT. Diseases were increasingly severe in TN, SMM and CA. Anthracnose (Colletotrichum gloesporioides f sp. manihotis), brown spot (Cercosporidium henningsii) and rust (Uromyces manihotis), were the most severe disesases, in this order. Hybrids with high levels of resistence to both pests and diseases were notified in all the places. These hybrids are promising genotypes, not only for the introgression of resistence traits into elite cassava varieties, but also to understanding the genetic basis of resistance to pests and diseases. |
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Palavras-Chave: |
Diseases; Hybrid. |
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Thesaurus NAL: |
cassava. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01954naa a2200217 a 4500
001 1654557
005 2008-01-29
008 2007 bl --- 0-- u #d
100 1 $aALVES, A. A. C.
245 $aEvaluation of cassava interspecific hybrids for resistance to pest and diseases in the different enviroments of Brazil.
260 $c2007
520 $aCassava interspecific hybrids were evaluated for pest and disease resistance in diferent enviroments of Brazil. Experiments were established in São Miguel das Matas (SMM), Tancredo Neves (TN), Cruz das Almas (CA) in the Bahia State and in Petrolina (PT), in the Pernambuco State. SMM, TN and CA are caracterized as subhumid enviroments with differrent annual average rainfall varing from 1000 to 1800 mm and PT is representative of the semi-arid (around 560 mm). Evaluations were performed every month starting 6 months after plantation (MAP) to 12 MAP. In all the places, the most relevant pest were cassava green mite (Mononychellus tanajoa) and cassava mealy bug (Phenacoccus manihoti), respectively, with the highest incidence in PT. Diseases were increasingly severe in TN, SMM and CA. Anthracnose (Colletotrichum gloesporioides f sp. manihotis), brown spot (Cercosporidium henningsii) and rust (Uromyces manihotis), were the most severe disesases, in this order. Hybrids with high levels of resistence to both pests and diseases were notified in all the places. These hybrids are promising genotypes, not only for the introgression of resistence traits into elite cassava varieties, but also to understanding the genetic basis of resistance to pests and diseases.
650 $acassava
653 $aDiseases
653 $aHybrid
700 1 $aFARIAS, A. R. N.
700 1 $aDITA, M. A.
700 1 $aSILVA, A. F.
700 1 $aBELLOTTI, A. C.
700 1 $aFREGENE, M. A.
773 $tIn: ANNUAL RESEARCH MEETING, 2007, Benoni. Poster Abstrcts...Benoni: Generation Challenge Programme - CGIAR, 2007.
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Embrapa Mandioca e Fruticultura (CNPMF) |
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