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	Provedor de dados OMA (1) BABT (1) BJMBR (1) Autor Chakravorty, R. (1) Franchini,Júlio C. (1) Lovrien,R.E. (1) Mares-Guia,M. (1) Miyazawa,Mário (1) Pavan,Marcos A. (1) Santoro,M.M. (1) Schneedorf,J.M. (1) Van Grieken, R. (1) Ziglio,Cláudio O. (1) Mais... Palavra-chave Coprecipitation (3) Acid soils (1) Aluminum (1) Binding isotherm (1) Cadmium (1) Dye binding (1) Liming (1) Radiochemistry (1) Sea water (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2001 (2) 1986 (1) País Brazil (2) Belgium (1) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Radiochemical study of Cd , Co and Eu coprecipitation with Iron Hydroxide in seawater OMA Chakravorty, R.; Van Grieken, R.. The coprecipitation of Cd, Co and Eu from seawater onto ferric hydroxide was studied, using the radioactive tracers <sup>109</sup>Cd, <sup>60</sup>Co and <sup>152-154</sup>Eu, as a function of the pH, the concentration of the collector iron, the concentration of the metal spike and the aging of the internally formed precipitate. For preconcentration purpose, a pH 9 and a 35 ppm iron concentration appeared to be suitable. At pH 8, the natural pH of seawater, the distribution coefficients for Cd, Co and Eu are 10<sup>4.5</sup>, 10<sup>5</sup> and 10<sup>7</sup>, respectively. Tipo: Info:eu-repo/semantics/article Palavras-chave: Cadmium; Coprecipitation; Radiochemistry; Sea water. Ano: 1986 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3236 Reduction of exchangeable calcium and magnesium in soil with increasing pH BABT Miyazawa,Mário; Pavan,Marcos A.; Ziglio,Cláudio O.; Franchini,Júlio C.. A laboratory study was conducted with soil samples and synthetic solutions to investigate possible mechanisms related with reduction in KCl exchangeable Ca and Mg with increasing pH. Increasing soil pH over 5.3 with CaCO3 added to the soil and with NaOH solution added to soil/KCl suspension increased adsorptions of Ca and Mg. The reduction of Mg was greater than Ca and was related to the concentration of soil exchangeable Al. The decreases of soluble Ca and Mg following addition of Al in synthetic solution were at pH > 7.5. The isomorphic coprecipitation reaction with Al compounds may be the most possible mechanism responsible for the decrease of exchangeable Ca and Mg with increasing pH. Possible chemical reactions are presented. Tipo: Info:eu-repo/semantics/article Palavras-chave: Coprecipitation; Aluminum; Liming; Acid soils. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000200007 A time-dependent, two-step binding mode of the nitro dye flavianic acid to trypsin in acid media BJMBR Schneedorf,J.M.; Santoro,M.M.; Lovrien,R.E.; Mares-Guia,M.. Synthetic dyes bind to proteins causing selective coprecipitation of the complexes in acid aqueous solution by a process of reversible denaturation that can be used as an alternative method for protein fractionation. The events that occur before precipitation were investigated by equilibrium dialysis using bovine trypsin and flavianic acid as a model able to cause coprecipitation. A two-step mode of interaction was found to be dependent on the incubation periods allowed for binding, with pronounced binding occurring after 42 h of incubation. The first step seems to involve hydration effects and conformational changes induced by binding of the first dye molecule, following rapid denaturation due to the binding of six additional flavianate anions to the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Dye binding; Binding isotherm; Coprecipitation. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000800012 Registros recuperados: 3 Primeira ... 1 ... Última

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