Composition of non-microbially reducible Fe(III) in aquatic sediments

Article Abstract:

Oxalate-extractable Fe(III) is unavailable for microbial reduction in anoxic sediments does not take the form of mixed Fe(III) -Fe(II) but in the form of highly crystalline Fe(III) oxides. The production of small quantities of Fe(II) during the early phase of microbial Fe(III) decrease significantly increased the amount of Fe(III) that could be isolated from freshwater sediments with oxalate. In the presence of catalytic quantities of Fe(III) oxides such as goethite and hematite (12) indicating that the Fe(II) in anoxic sediments might catalyze the oxalate extraction of non-microbially reducible crystalline Fe(III) oxides.

Microbiological assay

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Role of humic-bound iron as an electron transfer agent in dissimilatory Fe(III) reduction

Article Abstract:

Research was conducted to examine the role of humic-bound iron as an electron transfer agent in dissimilatory Fe(III) reduction. Results demonstrate that the electron-accepting abilities of a wide range of highly purified humic substances were a lot higher than the electron-accepting abilities of the microbially reducible Fe(III). This showed that Fe(III) in humic substances can at best account for a small amount of the initial electron transfer to humic substances in environments in which Fe(III) reduction is the terminal electron-accepting process.

Organic compounds, Ferric oxide

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Acetate oxidation by dissimilatory Fe(III) reducers

Article Abstract:

An argument is presented contesting the analysis of Nealson and Myers regarding the capability of Shewanella putrefaciens to oxidize acetate with the reduction of Fe(III). Other strains are suggested as models of this type of oxidative process. On the other hand, the original authors pointed out that the analysis presented constitutes poor microbiology. Although some strains of S. putrefaciens are sluggish acetate users, further experiments are needed to establish their significance within this context.

Physiological aspects, Microbial metabolism, Acetates

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