Biogenic manganese oxides: Properties and mechanisms of formation

  title={Biogenic manganese oxides: Properties and mechanisms of formation},
  author={Bradley M. Tebo and John R. Bargar and Brian G. Clement and Gregory J. Dick and Karen J. Murray and Dorothy L. Parker and Rebecca Verity and Samuel M. Webb},
  journal={Annual Review of Earth and Planetary Sciences},
▪ Abstract Manganese(IV) oxides produced through microbial activity, i.e., biogenic Mn oxides or Mn biooxides, are believed to be the most abundant and highly reactive Mn oxide phases in the environment. They mediate redox reactions with organic and inorganic compounds and sequester a variety of metals. The major pathway for bacterial Mn(II) oxidation is enzymatic, and although bacteria that oxidize Mn(II) are phylogenetically diverse, they require a multicopper oxidase-like enzyme to oxidize… 

The molecular biogeochemistry of manganese(II) oxidation.

The mechanisms by which bacteria oxidize Mn(II) include a two-electron oxidation reaction catalysed by a novel multicopper oxidase that produces Mn(IV) oxides as the primary product.

Microbial manganese oxide formation and interaction with toxic metal ions.

The enzymatic Mn(II) oxidation and interactions of biogenic Mn oxides with toxic metal and metalloid ions are summarized and laboratory cultures of bacterial and fungal Mn oxidizers are expected to provide fundamental knowledge in their potential use for remediation of environments and effluents contaminated with toxicMetal(loid) ions.

Mn(II,III) oxidation and MnO2 mineralization by an expressed bacterial multicopper oxidase

The results demonstrate that Mn oxidation from soluble Mn(II) to Mn(IV) oxides is a two-step reaction catalyzed by an MCO-containing complex, broadening the understanding of Mn mineral formation and the bioinorganic capabilities of MCOs.

Constraints on superoxide mediated formation of manganese oxides

This work provides the first direct evidence that, under conditions relevant to natural waters, oxidation of Mn(II) by superoxide can occur and lead to formation of Mn oxides.

The Molecular Geomicrobiology of Bacterial Manganese(II) Oxidation

Manganese is the second most abundant transition metal found in the Earth’s crust. It has a significant biological role as it is a cofactor of enzymes such as superoxide dismutase and is the key

Cation effects on the layer structure of biogenic Mn-oxides.

Results demonstrate that Mn octahedral layer symmetry and composition are sensitive to previous cations during BioMnO(x) formation, and H(+) and Ni(II) enhance vacant site formation, whereas Na(+ and Ca(2+) favor formation of Mn(III) and its ordered distribution in MnOctahedral layers.

Biotransformations of Manganese

The redox properties of manganese (Mn), make it central to a variety of biological processes and result in significant and often rapid biogeochemical cycling that is mediated by abiotic and biotic

Reactivity of biogenic manganese oxide for metal sequestration and photochemistry: Computational solid state physics study

Many microbes, including both bacteria and fungi, produce manganese (Mn) oxides by oxidi- zing soluble Mn(II) to form insoluble Mn(IV) oxide minerals, a kinetically much faster process than abiotic

Bacteriogenic manganese oxides.

Because of its high surface area and oxidizing power, bacteriogenic MnO(2) efficiently degrades biologically recalcitrant organic molecules to lower-molecular-mass compounds, spurring interest in using these properties in the bioremediation of xenobiotic organic compounds.



Oxidation of humic substances by manganese oxides yields low-molecular-weight organic substrates

MANY bacteria oxidize thermodynamically unstable manganese(II) to Mn oxides and deposit the oxides on their surfaces1,2, a process that appears to account for most Mn oxidation in natural waters3–5

Cobalt(II) Oxidation by the Marine Manganese(II)-Oxidizing Bacillus sp. Strain SG-1

Results suggest that some microorganisms may directly oxidize Co(II) and such biological activities may exert some control on the behavior of Co in nature.

Effect of oxide formation mechanisms on lead adsorption by biogenic manganese (hydr)oxides, iron (hydr)oxides, and their mixtures.

Interactions in iron/manganese (hydr)oxide mixtures related to the formation process and sequence of formation such as site masking, alterations in specific surface area, or changes in crystalline structure either did not occur or had a negligible effect on Pb adsorption by the mixtures.

Microbial Oxidation of Fe(II) and Mn(II) at Circumneutral pH

Representatives of some of the Fe oxidizers that are known to occur in the habitats are discussed in detail in this chapter, including three quite different Mn-oxidizing organisms.

Enzymatic Manganese(II) Oxidation by Metabolically Dormant Spores of Diverse Bacillus Species

Overall, these studies suggest that the commonly held view that bacterial spores are merely inactive structures in the environment should be revised.