Physics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2073a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 8, pp.2073-2076
Physics
3
Scientific paper
Leptothrix discophora SS-1 excretes at least one Mn 2+ -oxidizing protein that, in association with acidic exopolymers, catalyzes a rapid oxidation of Mn 2+ . Iodometric titration of Mn oxide product showed that the oxidation state of Mn increased with age of the oxide from 3.32 in samples 11 hours old to 3.62 in samples formed over a period of 30 days. Electron diffraction of 90-day old samples showed evidence of poorly crystalline Mn(IV) oxides. Simultaneous measurement of oxygen consumption and Mn oxide formation during 15 min reaction periods indicated that the initial Mn product possessed an average oxidation state no greater than 3.6. Results suggest that the Mn 2+ -oxidizing system of Leptothrix discophora SS-1 first generates Mn oxide with an average oxidation state close to Mn(III). Aging increases this oxidation state to give the mixed Mn(III, IV) oxide product observed in older samples.
Adams Lee F.
Ghiorse William C.
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