Real-Time Manganese Phase Dynamics during Biological and Abiotic Manganese Oxide Reduction.

ABSTRACT: Manganese oxides are often highly reactive and easily reduced, both abiotically, by a variety of inorganic chemical species, and biologically during anaerobic respiration by microbes. To evaluate the reaction mechanisms of these different reduction routes and their potential lasting products, we measured the sequence progression of microbial manganese(IV) oxide reduction mediated by chemical species (sulfide and ferrous iron) and the common metal-reducing microbe Shewanella oneidensis MR-1 under several endmember conditions, using synchrotron X-ray spectroscopic measurements complemented by X-ray diffraction and Raman spectroscopy on precipitates collected throughout the reaction. Crystalline or potentially long-lived phases produced in these experiments included manganese(II)-phosphate, m

SUBMITTER: Johnson JE 

PROVIDER: S-EPMC5502836 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature