DOI: 10.1111/gbi.12288
Scopus记录号: 2-s2.0-85045876056
论文题名: Oxygen isotope analysis of bacterial and fungal manganese oxidation
作者: Sutherland K.M. ; Wankel S.D. ; Hansel C.M.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2018
语种: 英语
英文关键词: Biominerals
; Manganese oxide
; Oxygen isotope
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: The ability of micro-organisms to oxidize manganese (Mn) from Mn(II) to Mn(III/IV) oxides transcends boundaries of biological clade or domain. Many bacteria and fungi oxidize Mn(II) to Mn(III/IV) oxides directly through enzymatic activity or indirectly through the production of reactive oxygen species. Here, we determine the oxygen isotope fractionation factors associated with Mn(II) oxidation via various biotic (bacteria and fungi) and abiotic Mn(II) reaction pathways. As oxygen in Mn(III/IV) oxides may be derived from precursor water and molecular oxygen, we use a twofold approach to determine the isotope fractionation with respect to each oxygen source. Using both 18O-labeled water and closed-system Rayleigh distillation approaches, we constrain the kinetic isotope fractionation factors associated with O atom incorporation during Mn(II) oxidation to -17.3‰ to -25.9‰ for O2 and -1.9‰ to +1.8‰ for water. Results demonstrate that stable oxygen isotopes of Mn(III/IV) oxides have potential to distinguish between two main classes of biotic Mn(II) oxidation: direct enzymatic oxidation in which O2 is the oxidant and indirect enzymatic oxidation in which superoxide is the oxidant. The fraction of Mn(III/IV) oxide-associated oxygen derived from water varies significantly (38%-62%) among these bio-oxides with only weak relationship to Mn oxidation state, suggesting Mn(III) disproportionation may account for differences in the fraction of mineral-bound oxygen from water and O2. Additionally, direct incorporation of molecular O2 suggests that Mn(III/IV) oxides contain a yet untapped proxy of δ18OO2 of environmental O2, a parameter reflecting the integrated influence of global respiration, photorespiration, and several other biogeochemical reactions of global significance. © 2018 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85030
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Department of Marine Chemistry and Geochemistry Woods Hole Oceanographic Institution Woods Hole Massachusetts; Department of Earth, Atmospheric and Planetary Science Massachusetts Institute of Technology Cambridge, Massachusetts
Recommended Citation:
Sutherland K.M.,Wankel S.D.,Hansel C.M.. Oxygen isotope analysis of bacterial and fungal manganese oxidation[J]. Geobiology,2018-01-01