Redox Mediators
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. APPLICATION OF RESIDUAL YEAST AS A SOURCE OF REDOX MEDIATORS FOR THE ANAEROBIC DECOLORIZATION OF A MODEL AZO DYE
Abstract This work investigated the anaerobic degradation of the model azo dye Remazol Yellow Gold RNL in batch reactors using discharged residual yeast as the source of redox mediators (RM). Two yeast lysis methods (mechanical lysis and sonication) were tested and optimized to produce a riboflavin-rich yeast lysate. The reactors were operated at 25 ºC for
Braz. J. Chem. Eng.. Publicado em: 2016-12
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2. Microbial dynamics during azo dye degradation in a UASB reactor supplied with yeast extract
The present work aimed to investigate the microbial dynamics during the anaerobic treatment of the azo dye blue HRFL in bench scale upflow anaerobic sludge bed (UASB) reactor operated at ambient temperature. Sludge samples were collected under distinct operational phases, when the reactor were stable (low variation of color removal), to assess the effect of
Braz. J. Microbiol.. Publicado em: 2014-12
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3. Use of multivariate experimental designs for optimizing the reductive degradation of an azo dye in the presence of redox mediators
The optimization of the anaerobic degradation of the azo dye Remazol golden yellow RNL was performed according to multivariate experimental designs: a 2² full-factorial design and a central composite design (CCD). The CCD revealed that the best incubation conditions (90% color removal) for the degradation of the azo dye (50 mg L- 1) were achieved with 350 m
Quím. Nova. Publicado em: 2014-06
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4. Effect of dye structure and redox mediators on anaerobic azo and anthraquinone dye reduction
We investigated the biological decolourisation of dyes with different molecular structures. The kinetic constant values (k1) achieved with azo dye Reactive Red 120 were 7.6 and 10.1 times higher in the presence of RM (redox mediators) AQDS and riboflavin, respectively, than the assays lacking RM. The kinetic constant achieved with the azo dye Congo Red was 4
Química Nova. Publicado em: 2012
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5. Influência do sistema renina angiotensina na modulação do estado redox, no balanço autonômico e na hipertrofia cardíaca induzida pelo hipertireoidismo experimental
Hyperthyroidism is an epidemiologic relevant pathology, which substantially affects the cardiovascular system. The hyperthyroid state may affect basal metabolism, O2 cell consumption, renin-angiotensin system, and increase reactive oxygen species production. Those alterations produce morphological, biochemical, functional and molecular consequences in cardia
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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6. Aspectos QuÃmicos e BiolÃgicos Envolvidos na RemoÃÃo de Cor de Corantes TÃxteis sob CondiÃÃes AnaerÃbias na PresenÃa de Mediadores Redox / CHEMICAL AND BIOLOGICAL ASPECTS INVOLVED IN COLOR REMOVAL OF TEXTILE DYES UNDER ANAEROBIC CONDITIONS IN THE PRESENCE OF THE REDOX MEDIATORS
Nesta pesquisa, foram realizados experimentos em batelada e em fluxo contÃnuo com o objetivo de esclarecer diversos aspectos quÃmicos e biolÃgicos envolvidos no processo de remoÃÃo de cor de corantes tÃxteis sob condiÃÃes anaerÃbias na presenÃa de mediadores redox. Os testes em batelada possibilitaram a avaliaÃÃo do efeito de diferentes substrato
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/11/2010
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7. Effect of nitrate on azo dye reduction by mesophilic granular sludge / Efeito do nitrato na descoloraÃÃo redutiva de corante azo por lodo anaerobio mesofiÂlico
A presente investigaÃÃo teve como objetivo estudar o efeito do nitrato na remoÃÃo de cor de efluente tÃxtil em reatores anaerÃbios suplementados ou nÃo com mediadores redox. Dois reatores anaerÃbios em paralelo foram operados com um tempo de detenÃÃo hidrÃulica (TDH) de 10 horas, com etanol como co-substrato. O experimento em fluxo contÃnuo foi d
Publicado em: 2007
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8. Reactive oxygen species and angiotensin II signaling in vascular cells: implications in cardiovascular disease
Diseases such as hypertension, atherosclerosis, hyperlipidemia, and diabetes are associated with vascular functional and structural changes including endothelial dysfunction, altered contractility and vascular remodeling. Cellular events underlying these processes involve changes in vascular smooth muscle cell (VSMC) growth, apoptosis/anoikis, cell migration
Brazilian Journal of Medical and Biological Research. Publicado em: 2004-08
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9. Identification of Quinoide Redox Mediators That Are Formed during the Degradation of Naphthalene-2-Sulfonate by Sphingomonas xenophaga BN6
During aerobic degradation of naphthalene-2-sulfonate (2NS), Sphingomonas xenophaga strain BN6 produces redox mediators which significantly increase the ability of the strain to reduce azo dyes under anaerobic conditions. It was previously suggested that 1,2-dihydroxynaphthalene (1,2-DHN), which is an intermediate in the degradative pathway of 2NS, is the pr
American Society for Microbiology.
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10. Natural Mediators in the Oxidation of Polycyclic Aromatic Hydrocarbons by Laccase Mediator Systems
The oxidation of polycyclic aromatic compounds was studied in systems consisting of laccase from Trametes versicolor and so-called mediator compounds. The enzymatic oxidation of acenaphthene, acenaphthylene, anthracene, and fluorene was mediated by various laccase substrates (phenols and aromatic amines) or compounds produced and secreted by white rot fungi.
American Society for Microbiology.
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11. Scanning electrochemical microscopy of living cells: Different redox activities of nonmetastatic and metastatic human breast cells
Electrochemical methods have been widely used to monitor physiologically important molecules in biological systems. This report describes the first application of the scanning electrochemical microscope (SECM) to probe the redox activity of individual living cells. The possibilities of measuring the rate and investigating the pathway of transmembrane charge
The National Academy of Sciences.
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12. Direct measurement of cyclic current-voltage responses of integral membrane proteins at a self-assembled lipid-bilayer-modified electrode: cytochrome f and cytochrome c oxidase.
Direct cyclic voltage-current responses, produced in the absence of redox mediators, for two detergent-solubilized integral membrane proteins, spinach cytochrome f and beef heart cytochrome c oxidase, have been obtained at an optically transparent indium oxide electrode modified with a self-assembled lipid-bilayer membrane. The results indicate that both pro