Oxidoreduction
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Biorreciclagem de hexano e estudo de reações de óxido-redução usando plantas comestíveis / Biorecycling of hexane and study of oxido-reduction reactions using edible plants
The present work had as main goals the use of enzymatic reactions to degrade laboratory residues and to synthesize chiral alcohols. In the first part, it was carried out a screening of microorganisms and hydrolytic enzymes aiming the biorecycling of hexane from laboratory residues (a mixture of hexane-ethyl acetate). This misture is widely employed to purify
Publicado em: 2008
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2. Avaliação do potencial de oxidoredução enantiosseletiva de bactérias termotolerantes do gênero Acetobacter. / The potential of thermotolerant Acetobacter strains for enantioselective oxidoreduction.
Álcool desidrogenase NAD-independente, enzima ligada a membrana, das espécies Acetobacter e Gluconobacter mostram apreciável enantioseletividade na oxidação de álcoois quirais primários e secundários. Em estudos anteriores, esta enzima foi isolada e caracterizada de espécies mesofílicas Acetobacter sp como uma quinohemoproteína álcool desidrogena
Publicado em: 2005
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3. Extracellular Oxidoreduction Potential Modifies Carbon and Electron Flow in Escherichia coli
Wild-type Escherichia coli K-12 ferments glucose to a mixture of ethanol and acetic, lactic, formic, and succinic acids. In anoxic chemostat culture at four dilution rates and two different oxidoreduction potentials (ORP), this strain generated a spectrum of products which depended on ORP. Whatever the dilution rate tested, in low reducing conditions (−100
American Society for Microbiology.
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4. Fusion of liposomes with mitochondrial inner membranes
A procedure is outlined for the fusion of mixed phospholipid liposomes (small unilamellar vesicles) with the mitochondrial inner membrane, which enriches the membrane lipid bilayer 30-700% in a controlled fashion. Fusion was initiated by manipulation of the pH of a mixture of freshly sonicated liposomes and the functional inner membrane/matrix fraction of ra
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5. Oxidation and Reduction of D-Xylose by Cell-Free Extract of Pichia quercuum
The fermentation mechanism of the simultaneous production of D-xylonic acid and xylitol from D-xylose by Pichia quercuum was studied by using a cell-free enzyme preparation. Nicotinamide adenine dinucleotide phosphate (NADP)-dependent D-xylose dehydrogenase activity and NADP-dependent D-xylose reductase activity were detected, and the oxido-reduction reactio
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6. A Proposed Hydrogen Transfer Function for Cytochrome c
Outlines of proposed mechanisms for cytochrome c oxidoreduction are presented which differ in detail from those previously published. The mechanisms, while accommodating the fact that cytochrome c is a net electron acceptor and donor in its catalytic cycle, dictate that the enzyme catalyses hydrogen transfer. It is shown that the mechanism of cytochrome c re
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7. Pearson's marrow-pancreas syndrome. A multisystem mitochondrial disorder in infancy.
Pearson's marrow-pancreas syndrome (McKusick No. 26056) is a fatal disorder of hitherto unknown etiology involving the hematopoietic system, exocrine pancreas, liver, and kidneys. The observation of high lactate/pyruvate molar ratios in plasma and abnormal oxidative phosphorylation in lymphocytes led us to postulate that Pearson's syndrome belongs to the gro
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8. Structure of cytochrome c555 of Chlorobium thiosulfatophilum: primitive low-potential cytochrome c.
Cytochrome c555 is an 86-residue type c cytochrome derived from Chlorobium thiosulfatophilum, an obligately anaerobic green sulfur bacterium which is among the most primitive of living organisms. Here is presented a preliminary structural description of the cytochrome c555 molecule based on its crystallographic structure determination at 2.7-A resolution by
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9. Purification and Characterization of Monovalent Cation-Activated Levodione Reductase from Corynebacterium aquaticum M-13
(6R)-2,2,6-Trimethyl-1,4-cyclohexanedione (levodione) reductase was isolated from a cell extract of the soil isolate Corynebacterium aquaticum M-13. This enzyme catalyzed regio- and stereoselective reduction of levodione to (4R,6R)-4-hydroxy-2,2,6-trimethylcyclohexanone (actinol). The relative molecular mass of the enzyme was estimated to be 142,000 Da by hi
American Society for Microbiology.
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10. A novel antifolate resistance gene on the amplified H circle of Leishmania.
In several Leishmania spp., resistance to methotrexate and other drugs is often associated with amplification of the chromosomal H region in the form of extrachromosomal H circles. We report here that the H circle of Leishmania tarentolae contains an 867 bp open reading frame, ltdh, which mediates high levels of resistance to methotrexate and other antifolat
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11. The analysis of the intramacrophagic virulome of Brucella suis deciphers the environment encountered by the pathogen inside the macrophage host cell
The pathogen Brucella suis resides and multiplies within a phagocytic vacuole of its host cell, the macrophage. The resulting complex relationship has been investigated by the analysis of the set of genes required for virulence, which we call intramacrophagic virulome. Ten thousand two hundred and seventy-two miniTn5 mutants of B. suis constitutively express
National Academy of Sciences.
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12. Reduction of Soluble Iron and Reductive Dissolution of Ferric Iron-Containing Minerals by Moderately Thermophilic Iron-Oxidizing Bacteria
Five moderately thermophilic iron-oxidizing bacteria, including representative strains of the three classified species (Sulfobacillus thermosulfidooxidans, Sulfobacillus acidophilus, and Acidimicrobium ferrooxidans), were shown to be capable of reducing ferric iron to ferrous iron when they were grown under oxygen limitation conditions. Iron reduction was mo
American Society for Microbiology.