Microbiological evidence for Fe(iii) reduction on early Earth

Article Abstract:

Sulphur reduction is generally considered to have been an early form of microbial respiration. However it is more likely that Fe(III) is more likely to have been the first external electron acceptor in microbal metabolism, according to geochemical evidence. Archaea and Bacteria are shown to reduce FE(III) to Fe(II) and retain energy to support growth from respiration. Thermotoga maritima can grow as a respiratory organism when Fe(III) is provided as an electron acceptor. The results suggest that Fe(III) reduction may have been an important early process.

Observations, Microbial respiration

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Reduction of Fe(III) in sediments by sulphate-reducing bacteria

Article Abstract:

Sulphate-reducing bacteria cause siderite formation in sediments of salt marshes. The bacteria directly reduce Fe(III) using an enzyme process, rather than using sulphide to indirectly reduce Fe(III) into iron sulphides. Attention should now be paid to the bacteria as a possible major source of Fe(III) reduction in ground water and aquatic sediment.

Oxidation-reduction reaction, Oxidation-reduction reactions, Sulfur bacteria, Siderite

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Extracellular electron transfer via microbial nanowires

Article Abstract:

A demonstration that a pilus-deficient mutant of Geobacter sulfurreducens could not reduce Fe(III) oxides, but could attach to them, is presented. The results indicate the pili of G. sulfurreducens might serve as biological nanowires, transferring electrons from the cell surface to the surface of Fe(III) oxides.

United States, Science & research, Genetic aspects, Microbial biotechnology, Electron transport, Biotechnological microorganisms, Iron bacteria, Metal-reducing bacteria

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