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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
12/01/2009 |
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Data da última atualização: |
06/04/2022 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
NOVOTNY, E. H.; HAYES, M. H. B.; SONG, G.; AZEVEDO, E. R. de; BONAGAMBA, T. |
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Afiliação: |
ETELVINO HENRIQUE NOVOTNY, CNPS; MICHAEL HILARY B. HAYES, UNIVERSITY OF LIMERICK; GUIXUE SONG, UNIVERSITY OF LIMERICK; EDUARDO RIBEIRO DE AZEVEDO, USP; TITO JOSÉ BONAGAMBA, USP. |
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Título: |
Extraction and characterisation of humin fraction from Amazonian anthropogenic dark earth soils ("Terra Preta de Indios"). |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: INTERNATIONAL MEETING OF THE INTERNATIONAL HUMIC SUBSTANCES SOCIETY, 14., 2008, Saint Petersburg. From molecular understanding to innovative applications of humic substances: proceedings... Moscow: Lomonosov Moscow State University, 2008. v. 1, p. 105-108. |
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Idioma: |
Inglês |
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Conteúdo: |
Humin, the humic fraction that is insoluble in water at all pH values, typically comprises more than 50% of soil organic matter (1). Because of the difficulties in isolation, humin compositions and properties have been less extensively studied than those of humic and fulvic acids (2). On the basis of the accepted definition, humin can include any humic-type substances that are not dissolv ed during exhaustive extractions with aqueous base. A solvent system composed of a mixture of aqueous base/urea (0.1 M NaOH + 6 M urea, base/urea) has been reported to isolate material that would be classified as humin in the classical definition (3, 4, 5). Because urea is a powerful hydrogen bond breaker, it is considered that soil organic components were released from associations with humin materials either by the breaking of hydrogen bonds, or by the disruption of steric constraints by materials that had trapped the components released. Dimethylsulfoxide (DMSO), a dipolar aprotic solvent, is an excellent solvent for cations but a poor solvent for anions (6). It is a good hydrogen bond breaker and the non- polar backbone (as distinct from the S=O face) of DMSO can be considered to have affinities for less polar humin components. A solvent mixture of DMSO with HCl (6%, v/v) was reported to have isolated less than 22% of humin material from soils (7, 8, 9). However H 2SO4 is a very polar liquid with a high dielectric constant (~100), and due to the process of autoprotolysis (10), protons are highly mobile in H 2SO4. This enables it to protonate the conjugate bases (carboxylates and phenolates), thereby increasing the solubility of the organic material (4, 5), since anions are weakly solvated in DMSO. MenosHumin, the humic fraction that is insoluble in water at all pH values, typically comprises more than 50% of soil organic matter (1). Because of the difficulties in isolation, humin compositions and properties have been less extensively studied than those of humic and fulvic acids (2). On the basis of the accepted definition, humin can include any humic-type substances that are not dissolv ed during exhaustive extractions with aqueous base. A solvent system composed of a mixture of aqueous base/urea (0.1 M NaOH + 6 M urea, base/urea) has been reported to isolate material that would be classified as humin in the classical definition (3, 4, 5). Because urea is a powerful hydrogen bond breaker, it is considered that soil organic components were released from associations with humin materials either by the breaking of hydrogen bonds, or by the disruption of steric constraints by materials that had trapped the components released. Dimethylsulfoxide (DMSO), a dipolar aprotic solvent, is an excellent solvent for cations but a poor solvent for anions (6). It is a good hydrogen bond breaker and the non- polar backbone (as distinct from the S=O face) of DMSO can be considered to have affinities for less polar humin components. A solvent mixture of DMSO with HCl (6%, v/v) was reported to have isolated less than 22% of humin material from soils (7, 8, 9). However H 2SO4 is a very polar liquid with a high dielectric constant (~100), and due to the process of autoprotolysis (10), protons a... Mostrar Tudo |
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Palavras-Chave: |
black carbon; indios; NMR; pyrogenic carbon. |
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Thesaurus Nal: |
humin; terra preta. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/334758/1/Extraction-and-characterization-of-humin-fraction-2008.pdf
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Marc: |
LEADER 02605nam a2200229 a 4500
001 1334758
005 2022-04-06
008 2008 bl uuuu u00u1 u #d
100 1 $aNOVOTNY, E. H.
245 $aExtraction and characterisation of humin fraction from Amazonian anthropogenic dark earth soils ("Terra Preta de Indios").$h[electronic resource]
260 $aIn: INTERNATIONAL MEETING OF THE INTERNATIONAL HUMIC SUBSTANCES SOCIETY, 14., 2008, Saint Petersburg. From molecular understanding to innovative applications of humic substances: proceedings... Moscow: Lomonosov Moscow State University, 2008. v. 1, p. 105-108.$c2008
520 $aHumin, the humic fraction that is insoluble in water at all pH values, typically comprises more than 50% of soil organic matter (1). Because of the difficulties in isolation, humin compositions and properties have been less extensively studied than those of humic and fulvic acids (2). On the basis of the accepted definition, humin can include any humic-type substances that are not dissolv ed during exhaustive extractions with aqueous base. A solvent system composed of a mixture of aqueous base/urea (0.1 M NaOH + 6 M urea, base/urea) has been reported to isolate material that would be classified as humin in the classical definition (3, 4, 5). Because urea is a powerful hydrogen bond breaker, it is considered that soil organic components were released from associations with humin materials either by the breaking of hydrogen bonds, or by the disruption of steric constraints by materials that had trapped the components released. Dimethylsulfoxide (DMSO), a dipolar aprotic solvent, is an excellent solvent for cations but a poor solvent for anions (6). It is a good hydrogen bond breaker and the non- polar backbone (as distinct from the S=O face) of DMSO can be considered to have affinities for less polar humin components. A solvent mixture of DMSO with HCl (6%, v/v) was reported to have isolated less than 22% of humin material from soils (7, 8, 9). However H 2SO4 is a very polar liquid with a high dielectric constant (~100), and due to the process of autoprotolysis (10), protons are highly mobile in H 2SO4. This enables it to protonate the conjugate bases (carboxylates and phenolates), thereby increasing the solubility of the organic material (4, 5), since anions are weakly solvated in DMSO.
650 $ahumin
650 $aterra preta
653 $ablack carbon
653 $aindios
653 $aNMR
653 $apyrogenic carbon
700 1 $aHAYES, M. H. B.
700 1 $aSONG, G.
700 1 $aAZEVEDO, E. R. de
700 1 $aBONAGAMBA, T.
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Registro original: |
Embrapa Solos (CNPS) |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
11/01/2013 |
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Data da última atualização: |
11/01/2013 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
AQUINO, D. A. L. de; SILVA, M. L. da; SENA, E. M. N. de; LIRA, I. C. de S. A.; PASSOS, L. R. G.; ARAÚJO, C. de L.; FERREIRA, M. A. J. F. |
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Afiliação: |
DEISY AIANE LIMA DE AQUINO; MARIA LUCIENE DA SILVA; ELIZA MAIARA NOGUEIRA DE SENA; IRLANE CRISTINE DE SOUZA ANDRADE LIRA; LEILA REGINA GOMES PASSOS; CAROENE DE LIMA ARAUJO; MARIA ALDETE JUSTINIANO F FERREIRA, CPATSA. |
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Título: |
Caracterização morfológica e molecular de variedades locais de melancia. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
In: JORNADA DE INICIAÇÃO CIENTÍFICA DA EMBRAPA SEMIÁRIDO, 7.; JORNADA DE INICIAÇÃO CIENTÍFICA DA FACEPE/UNIVASF, 1., 2012, Petrolina. Anais... Petrolina: Embrapa Semiárido, 2012. |
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Páginas: |
p. 89-95. |
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Descrição Física: |
1 CD-ROM. |
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Série: |
(Embrapa Semiárido. Documentos, 248). |
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Idioma: |
Português |
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Conteúdo: |
O objetivo deste trabalho foi realizar a caracterização morfológica e molecular de 18 variedades locais (VLs) de melancia das comunidades baianas Tanque Novo (Casa Nova) e Vereda do Mari (Sento Sé). Para a caracterização morfológica, foram avaliados os caracteres de fruto: peso, cor da polpa, comprimento, diâmetro, espessura da casca na inflorescência, espessura da casca no pedúnculo, cor da casca, cor das listras, espessura das listras e teor de sólidos solúveis. Para a caracterização molecular, foi utilizado o marcador molecular ISSR. Para análise de agrupamento das características quantitativas, empregou-se a distância euclidiana média. Com os dados moleculares, foram estimados os coeficiente de similaridade de Jaccard. Para o agrupamento, nos dois casos, foi aplicado o algoritmo UPGMA. Conforme os resultados das caracterizações realizadas, existe grande variabilidade genética entre as VLs de melancia das duas comunidades, |
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Palavras-Chave: |
Recursos genéticos; Variabilidade genética; Variedade local. |
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Thesagro: |
Citrullus Lanatus; Cucurbitaceae; Melancia. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/73827/1/maria-aldete-fonseca.pdf
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Marc: |
LEADER 01926nam a2200277 a 4500
001 1944766
005 2013-01-11
008 2012 bl uuuu u00u1 u #d
100 1 $aAQUINO, D. A. L. de
245 $aCaracterização morfológica e molecular de variedades locais de melancia.
260 $aIn: JORNADA DE INICIAÇÃO CIENTÍFICA DA EMBRAPA SEMIÁRIDO, 7.; JORNADA DE INICIAÇÃO CIENTÍFICA DA FACEPE/UNIVASF, 1., 2012, Petrolina. Anais... Petrolina: Embrapa Semiárido$c2012
300 $ap. 89-95.$c1 CD-ROM.
490 $a(Embrapa Semiárido. Documentos, 248).
520 $aO objetivo deste trabalho foi realizar a caracterização morfológica e molecular de 18 variedades locais (VLs) de melancia das comunidades baianas Tanque Novo (Casa Nova) e Vereda do Mari (Sento Sé). Para a caracterização morfológica, foram avaliados os caracteres de fruto: peso, cor da polpa, comprimento, diâmetro, espessura da casca na inflorescência, espessura da casca no pedúnculo, cor da casca, cor das listras, espessura das listras e teor de sólidos solúveis. Para a caracterização molecular, foi utilizado o marcador molecular ISSR. Para análise de agrupamento das características quantitativas, empregou-se a distância euclidiana média. Com os dados moleculares, foram estimados os coeficiente de similaridade de Jaccard. Para o agrupamento, nos dois casos, foi aplicado o algoritmo UPGMA. Conforme os resultados das caracterizações realizadas, existe grande variabilidade genética entre as VLs de melancia das duas comunidades,
650 $aCitrullus Lanatus
650 $aCucurbitaceae
650 $aMelancia
653 $aRecursos genéticos
653 $aVariabilidade genética
653 $aVariedade local
700 1 $aSILVA, M. L. da
700 1 $aSENA, E. M. N. de
700 1 $aLIRA, I. C. de S. A.
700 1 $aPASSOS, L. R. G.
700 1 $aARAÚJO, C. de L.
700 1 $aFERREIRA, M. A. J. F.
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Embrapa Semiárido (CPATSA) |
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