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| Registros recuperados : 139 | |
| 1. |  | LOPES, A. S. Calagem. Informe Agropecuario, Belo Horizonte, v. 7, n. 81, p. 28-34, set. 1981.| Biblioteca(s): Epagri-Sede. |
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| 2. | | LOPES, A. S. Fosforo. Informe Agropecuario, Belo Horizonte, v. 7, n. 81, p. 34-46, set. 1981.| Biblioteca(s): Epagri-Sede. |
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| 9. | | LOPES, A. de A. Municipalizacao da agricultura. In: ENCONTRO DE HORTALICAS DA REGIAO SUL, 7, e ENCONTRO DE PLASTICULTURA DA REGIAO SUL, 4., 1990, Balneario Camboriu, SC. Resumos... Florianopolis: SOB, 1990. p.19-21.| Biblioteca(s): Epagri-Sede. |
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| Registros recuperados : 139 | |
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Registro Completo |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
18/04/2011 |
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Data da última atualização: |
19/04/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
-- - -- |
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Autoria: |
SCHVEITZER, B.; ZANETTE, D.; FELIPPE, A. C.; DAL BÓ, A.; LOPES, A. |
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Afiliação: |
Epagri |
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Título: |
The absence of cooperative binding in mixtures of sodium cholate and polyethylene oxide as indicated by surface tension steadystate fluorescence and electrical conductivity measurements. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Colloids and Surfaces A Physicochemical and Engineering Aspects Print, EUA, v. 279, p. 87-95, 2006. |
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Idioma: |
Inglês |
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Notas: |
ISSN, 09277757 |
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Conteúdo: |
The properties of mixtures of poly(ethylene oxide) (PEO) and sodium cholate (NaC) in tris¨CHCl buffer solutions, pH 9.00, varying the sodium cholate concentration up to 0.08 M and PEO concentration up to 0.227 M (¡Ö1 wt%), were investigated by means of electrical conductivity and surface tension measurements. In order to provide consistent support in the discussion of the conductivity and surface profile of the PEO¨CNaC mixtures, parallel experiments were performed for the highly studied polymer¨Csurfactant interaction known as the PEO¨Csodium dodecyl sulfate (SDS) system. The I1/I3 pyrene ratio¨Csurfactant concentration plots were used as an additional technique to follow the behavior of sodium cholate in the presence of PEO. Parameters in the conductivity and surface tension profiles, the critical aggregation concentration (cac), the breakpoint for the saturation of the polymer by the surfactants (psp) and other characteristics, such as the slopes of conductivity plots, the effect of polymer concentration on the cac and psp parameters and the amount of the associated surfactant per monomol of PEO were all investigated. The results led to the conclusion that no evidence of a cooperative process of binding on the polymer exists. |
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Categoria do assunto: |
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Marc: |
LEADER 01765naa a2200121 a 4500
001 1075777
005 2011-04-19
008 2006 bl uuuu u00u1 u #d
245 $aThe absence of cooperative binding in mixtures of sodium cholate and polyethylene oxide as indicated by surface tension steadystate fluorescence and electrical conductivity measurements.
260 $c2006
500 $aISSN, 09277757
520 $aThe properties of mixtures of poly(ethylene oxide) (PEO) and sodium cholate (NaC) in tris¨CHCl buffer solutions, pH 9.00, varying the sodium cholate concentration up to 0.08 M and PEO concentration up to 0.227 M (¡Ö1 wt%), were investigated by means of electrical conductivity and surface tension measurements. In order to provide consistent support in the discussion of the conductivity and surface profile of the PEO¨CNaC mixtures, parallel experiments were performed for the highly studied polymer¨Csurfactant interaction known as the PEO¨Csodium dodecyl sulfate (SDS) system. The I1/I3 pyrene ratio¨Csurfactant concentration plots were used as an additional technique to follow the behavior of sodium cholate in the presence of PEO. Parameters in the conductivity and surface tension profiles, the critical aggregation concentration (cac), the breakpoint for the saturation of the polymer by the surfactants (psp) and other characteristics, such as the slopes of conductivity plots, the effect of polymer concentration on the cac and psp parameters and the amount of the associated surfactant per monomol of PEO were all investigated. The results led to the conclusion that no evidence of a cooperative process of binding on the polymer exists.
773 $tColloids and Surfaces A Physicochemical and Engineering Aspects Print, EUA$gv. 279, p. 87-95, 2006.
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