Enzymes involved in anaerobic polyethylene glycol degradation by Pelobacter venetianus and Bacteroides strain PG1

Article Abstract:

The enzymes involved in anaerobic polyethylene glycol (PEG) degradation in cell extracts of Pelobacter venetianus were investigated. Two enzymes, a diol dehydratase and a PEG-degrading enzyme, were involved in PEG degradation. Corrinoids inhibited the activity of the diol dehydratase, but stimulated that of the PEG-degrading enzyme. The PEG-degrading enzyme (PEG acetaldehyde lyase) of another bacterium, Bacteroides strain PG1, was similar to that of P. venetianus. Thus, a corrinoid-dependent, diol dehydratase-analogous reaction mechanism was common in anaerobic PEG-degrading bacteria.

Environmental aspects, Enzymes, Polyethers, Glycol ethers

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Utilization of alkylbenzenes during anaerobic growth of pure cultures of denitrifying bacteria on crude oil

Article Abstract:

Pure cultures of denitrifying bacteria have the ability to grow under anaerobic conditions using crude oil as a source of organic substrates. The bacteria utilizes toluene, ethylbenzene, and m-xylene from the crude oil and o-xylene and p-xylene to a smaller extent. The compounds used by the bacteria are the most water-soluble oil hydrocarbons and represent groundwater pollutants at places contaminated with oil. The amount of hydrocarbons utilized by the bacteria is however, very small.

Petroleum, Biodegradation, Hydrocarbons

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Anaerobic, nitrate-dependent microbial oxidation of ferrous iron

Article Abstract:

Pure and enrichment cultures of nitrate-reducing bacteria grow with iron as the sole or additional electron donor under anaerobic conditions. However, the oxidation of ferrous iron by the bacteria is unobservable in the absence of nitrates or in heat-inactivated cultures. The product of nitrate reduction is dinitrogen. The bacteria are probably responsible for the production of ferric iron in the suboxic region of aquatic sediments.

Oxidation-reduction reaction, Oxidation-reduction reactions, Iron oxides

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