Ferrous iron oxidation by anoxygenic phototrophic bacteria

Article Abstract:

Molecular oxygen was always believed to be an essential factor as electron acceptor in the natural oxidation of ferrous to ferric iron by bacteria. Anoxic photochemical reactions have also been considered as mechanisms in ferrous iron oxidation. A purple, non-sulphur bacteria capable of oxidizing colorless Fe(II) to brown Fe(III) while reducing carbon dioxide to cell material is described. This implies that biological iron oxidation without aid of oxygen was already possible prior to evolution of oxygenic photosynthesis.

Research, Oxidation, Physiological, Physiological oxidation, Ferric oxide

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Microbial ferrous wheel

Article Abstract:

Several oceanographers have discovered that heterotrophic bacteria living in the subarctic Pacific contain more iron than phytoplankton also living in the area. The discovery suggests that bacteria compete with phytoplankton for the micronutrient. Aside from this discovery, the oceanographers also found out that bacteria can excrete ligands that dissolve iron, similar to phytoplankton. These discoveries support a previously introduced thesis that iron limits the growth of phytoplankton and bacteria.

Health aspects, Environmental aspects, Pacific Ocean, Iron, Iron (Metal), Phytoplankton

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Phosphite oxidation by sulphate reduction

Article Abstract:

A description is presented of the ability of a culture of marine lithoautotrophic bacteria to grow through a redox reaction which involves the microbial energy metabolism of phosphorus. The implication for evolutionary traits is discussed.

Marine bacteria, Anaerobic bacteria, Phosphorus, Phosphorus (Chemical element)

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