Transformation yields of chlorinated ethenes by a methanotrophic mixed culture expressing particulate methane monooxygenase

Article Abstract:

The transformation yields for the aerobic cometabolic degradation of trans-1,2-dichloroethylene, vinyl chloride, cis-1,2-dichloroethylene, trichloroethylene and 1,1-dichloroethylene are 0.57, 0.25, 0.058, 0.0019 and 0.00022, respectively. The degradation of trans-1,2-dichloroethylene and vinyl chloride is observed only in the presence of formate or methane and is enhanced by the particulate methane monooxygenase expression. This is easier to maintain in treatment systems unlike soluble methane monooxygenase which is expressed only by type II methanotrophs under copper-limited conditions.

Analysis, Biodegradation, Oxidases, Materials, Olefins, Alkenes

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Influence of the endogenous storage lipid poly-beta-hydroxybutyrate on the reducing power availability during cometabolism of trichloroethylene and naphthalene by resting methanotrophic mixed cultures

Article Abstract:

The role of poly-beta-hydroxybutyrate (PHB) in trichloroethylene (TCE) transformation and naphthalene oxidation rates by methanotrophic mixed cultures was investigated. A direct correlation was found between the PHB content in methanotrophic cells and the naphthalene oxidation rate, as well as between PHB and the TCE transformation rate and capacity. A deactivation of the methane monooxygenase might be involved in the decrease in the naphthalene oxidation rate in resting cells exposed to oxygen.

Naphthalene, Trichloroethylene, Polyhydroxybutyrate

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Inhibition of butyrate oxidation by formate during methanogenesis

Article Abstract:

The possibility that formate is an interspecies electron carrier is discussed. Butyrate and formate were used to perturbe a glucose-fed mixed methanogenic culture in the free energy analysis experiment. Propionate and and acetate concentrations remained constant throughout the experiment. The interspecies electron carrier role of formate for the conversion of butyrate into acetate was established.

Research, Oxidation-reduction reaction, Oxidation-reduction reactions, Methanobacteriaceae, Methanogens

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