Effects of electron donor and acceptor conditions on reductive dehalogenation of tetrachloromethane by Shewanella putrefaciens 200

Article Abstract:

Examination of the influence of various electron acceptors on reductive dehalogenation of tetrachloromethane by Shewanella putrefaciens 200 reveals that O2, NO(Sub 3)(super -) and NO(sub 2)(super -) inhibit the dehalogenation, while Fe(III), fumarate and trimethylamine oxide do not inhibit the dehalogenation. An electron transport model developed on the basis of reduction rate explains the inhibition patterns. Electron donors exert no influence on the rate of dehalogenation. In the absence of an exogenous electron donor, transformation of tetrachloromethane is supported by endogenous substrates.

Analysis, Biodegradation, Anaerobic bacteria

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Characterization of a novel Pseudomonas sp. that mineralizes high concentrations of pentachlorophenol

Article Abstract:

A Pseudomonas sp. strain, designated RA2, was isolated from a heavily pentachlorophenol (PCP)-contaminated soil sample. Characterization studies showed the bacterium is polarly flagellated with poly-beta-hydroxybutyrate storage granules. RA2 was able to utilize PCP as its sole carbon and energy source. Mixed substrate experiments further showed that RA2 preferred PCP over glucose. Radioactive tracer monitoring also showed that the bacterium could completely mineralize PCPs. These results indicate that strain RA2 has a potential application for bioremediation efforts in PCP-contaminated sites.

Physiological aspects, Pseudomonas, Identification and classification, Pentachlorophenol

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Microbial growth on dichlororbiphenyls chlorinated on both rings as a sole carbon and energy source

Article Abstract:

Researchers describe an aerobic bacterium that can degrade ortho-substituted dichlorobiphenyl compounds. This organism can be used in the sequential anaerobic-aerobic degradation of polychlorinated biphenyl (PCB)-contaminated soil.

Polychlorinated biphenyls

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