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	Provedor de dados Electron. J. Biotechnol. (3) Autor Pessôa de França,Francisca (3) Assumpção Henriques,Cristiane (1) Augusto da Costa,Antonio Carlos (1) Luiz Cardoso,Vicelma (1) Mesquita Vieira,Denise (1) Mora Tavares,Ana Paula (1) Pereira Duta,Flávia (1) da Costa,Antonio Carlos Augusto (1) de Almeida Lopes,Léa Maria (1) Mais... Palavra-chave Biosorption (1) Biosorption equilibrium continuous system lead Sargassum filipendula (1) Exopolysaccharides (1) Experimental design (1) Response surface method (1) Rhizobium sp. (1) Mais... Tipo do documento Journal article (3) Ano 2007 (1) 2006 (1) 2001 (1) País Chile (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Biosorption of lead by the brown seaweed Sargassum filipendula - batch and continuous pilot studies Electron. J. Biotechnol. Mesquita Vieira,Denise; Augusto da Costa,Antonio Carlos; Assumpção Henriques,Cristiane; Luiz Cardoso,Vicelma; Pessôa de França,Francisca. The biosorption of lead by the brown alga Sargassum filipendula was studied. pH 4.0 was the optimum value for the biosorption of lead. Isotherms indicated that for solutions containing 0.03 ± 0.001 up to 3.27 ± 0.04 mmol/L of lead, 2.0g/L was the optimum biomass concentration. The Langmuir model was fitted to represent the experimental data, and the kinetics of biosorption presented equilibrium in 30 min. The continuous system operated for 56 hrs presenting a 100% binding of ionic lead, which corresponds to an accumulation of 168 g lead, equivalent to a load of 1.7 mmol ionic lead/g Sargassum filipendula. The results that were obtained in a continuous system showed a gradual saturation of the biomass in the reactors Tipo: Journal article Palavras-chave: Biosorption; Biosorption equilibrium continuous system lead Sargassum filipendula. Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300004 Optimization of culture conditions for exopolysaccharides production in Rhizobium sp. using the response surface method Electron. J. Biotechnol. Pereira Duta,Flávia; Pessôa de França,Francisca; de Almeida Lopes,Léa Maria. The combined effects of the processing parameters for exopolysaccharides production by Rhizobium sp. was studied using the experimental design and response surface methodology. The experiments were carried out using a fermenter with 20 L capacity, as the reactor. All processing parameters were online monitored. The temperature [(30 ± 1)ºC] and pH value (7.0 ± 0.1) were kept constant throughout the experimental time. As statistical tools, a complete 2³ factorial planning with central point and response surface were used to study the interactions among three relevant variables of the fermentation process: calcium carbonate concentration, aeration and agitation. The processing parameters setup for reaching a maximum response for... Tipo: Journal article Palavras-chave: Exopolysaccharides; Experimental design; Response surface method; Rhizobium sp.. Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400007 The release of light metals from a brown seaweed (Sargassum sp.) during zinc biosorption in a continuous system Electron. J. Biotechnol. da Costa,Antonio Carlos Augusto; Mora Tavares,Ana Paula; Pessôa de França,Francisca. The biosorption of zinc and calcium was investigated with a biomass of Sargassum sp., a brown seaweed, in a continuous system consisting of three serial tubular fixed-bed laboratory reactors. Results indicated that zinc was efficiently recovered by the biomass. After treatment of 9.0 liters of a mixed solution containing 130.0 mg/l zinc and 260.0 mg/l calcium, the first column of the system saturated with zinc; the remaining columns did not saturate with zinc as a result of the pre treatment performed by the first reactor. Calcium was also efficiently biosorbed by the biomass, saturating the system much faster than zinc. X-ray fluorescence spectrum indicated the presence of various elements in the structure of the Sargassum sp. biomass, especially alkaline... Tipo: Journal article Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300007 Registros recuperados: 3 Primeira ... 1 ... Última

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