Reduction of nitroaromatic compounds mediated by Streptomyces sp. exudates

Article Abstract:

Exudates of Streptomyces griseoflavus were studied for the potential to mediate reduction of nitrobenzenes in aqueous solutions containing hydrogen sulfide as the electron donor. The results showed that the exudates contained effective electron transfer mediators. The reaction kinetics were comparable to model quinones, and not that of iron porphyrins. These results, in conjuction with earlier experiments suggest that the quinones cinnaquinone and dicinnaquinone are the exudate components responsible for mediating nitrobenzene reduction.

Research, Streptomyces, Quinone, Quinones, Aromatic compounds

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Activity and diversity of methanogens in a petroleum hydrocarbon-contaminated aquifer

Article Abstract:

The methanogenic activity in a petroleum hydrocarbon-contaminated aquifer is investigated by using a series of four push-pull tests with acetate, formate, H(sub 2) plus CO(sub 2), or methanol to target different groups of methanogenic Archaea. The results suggest that both aceticlastic and CO(sub 2)-type substrateconsuming methanoges are likely involved in the terminal step of hydrocarbon degradation, while methanogenesis from methanol plays a minor role.

Analysis, Nucleotide sequencing

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Effect of Afforestation and reforestation of pastures on the activity and population dynamics of methanotrophic bacteria

Article Abstract:

The effect of afforestation and reforestation of pastures on methane oxidation and the methanotrophic communities in soils from three different New Zealand sites is investigated. It is found that afforestation and reforestation of pastures causes changes in methane oxidation by altering the community structure of methanotrophic bacteria in these soils.

New Zealand, Environmental aspects

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