Base de dados : LILACS
Pesquisa : D02.309.750.500 [Categoria DeCS]
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Fotocópia
Id: lil-331802
Autor: Englebienne, P; López, M. G; Cortón, E; Viale, A. A.
Título: Use of a CO2 electrode to monitor fermentations that use xenobiotic compounds as source of carbon
Fonte: Rev. argent. microbiol;34(2):72-76, abr.-jun. 2002.
Idioma: en.
Resumo: Bacterial strains were isolated from contaminated waters, mud or soils. They are capable of growing in mineral medium with different chemicals as carbon source, such as aliphatic or aromatic hydrocarbons and polychlorinated biphenyls (PCBs). Most of these strains tolerate high concentrations (up to 30 v/v) of the xenobiotic substrates. This is particularly important for the development of fermenting processes to treat effluents or residues with a high content of contaminating compounds. An ion-specific potentiometric electrode (CO2) has been developed to measure CO2 production continuously. When the different strains were incubated in a mineral medium and in the presence of the corresponding substrate, a parallel between growth, substrate consumption and CO2 production was found. The developed system is suggested as an efficient and economical alternative to evaluate the potential of biodegradation by different microorganisms.
Descritores: Alcaligenes
Carbono
Dióxido de Carbono/análise
Eletrodos
Hidrocarbonetos
Micrococcus
Potenciometria
Pseudomonas aeruginosa
Xenobióticos/metabolismo
-Alcaligenes
Alcanos
Arocloros
Biodegradação Ambiental
Calibragem
Dióxido de Carbono/metabolismo
Poluentes Ambientais
Desenho de Equipamento
Fermentação
Micrococcus
Pseudomonas aeruginosa
Microbiologia do Solo
Estireno
Tolueno
Microbiologia da Água
Poluição Química da Água
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME


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Fotocópia
Id: lil-331789
Autor: Haglund, C; Levín, L; Forchiassin, F; López, M; Viale, A.
Título: Degradation of environmental pollutants by Trametes trogii
Fonte: Rev. argent. microbiol;34(3):157-162, jul.-sept. 2002.
Idioma: en.
Resumo: The ability of the ligninolytic fungus Trametes trogii to degrade in vitro different xenobiotics (PCBs, PAHs and dyes) was evaluated. Either 200 ppm of a PCB mixture (Aroclor 1150) or 160 ppm of an industrial PAH mixture (10 V/V of PAHs, principal components hexaethylbenzene, naphthalene, 1-methyl naphthalene, acenaphthylene, anthracene, fluorene and phenanthrene), were added to trophophasic and idiophasic cultures growing in a nitrogen limited mineral medium (glucose/asparagine) and in a complex medium (malt extract/glucose). Gas-liquid chromatography proved that within 7 to 12 d more than 90 of the organopollutants added were removed. The decrease in absorbance at 620 nm demonstrated that cultures of this fungus were able to transform 80 of the dye Anthraquinone-blue (added at a concentration of 50 ppm) in 1.5 h. Enzyme estimations indicated high activity of laccase (up to 0.55 U/mL), as well as lower production of manganese-peroxidase. Laccase activity, detected in all the conditions assayed, could be implicated in the degradation of these organopollutants. Considering the results obtained, T. trogii seems promising for detoxification.
Descritores: Biodegradação Ambiental
Polyporales
Poluentes do Solo
-Arocloros
Indústria Química
Corantes
Cromatografia Gasosa-Espectrometria de Massas
Hidrocarbonetos Aromáticos/metabolismo
Resíduos Industriais
Oxirredutases
Bifenilos Policlorados
Proteínas Fúngicas/metabolismo
Xenobióticos/metabolismo
Tipo de Publ: Estudo Comparativo
Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME



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