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Microbial reduction of manganese oxides - Interactions with iron and sulfurAlteromonas putrefaciens (strain MR-1) is capable of rapid Mn(IV) reduction under conditions of neutral pH and temperatures characteristic of the Oneida Lake, New York, sediments from which it was isolated. MR-1 also reduces Fe(3+) to Fe(2+), and disproportionates thiosulfate to sulfide and sulfite; independently, the Fe(2+) and sulfide act as rapid reductants of Mn. The addition of Fe(3+) or thiosulfate to cultures of MR-1 in the presence of oxidized Mn increases the rate and the extent of Mn reduction relative to that observed in the absence of Fe(3+) or thiosulfate. Furthermore, when Fe(3+) and Mn oxides are present conjointly, Fe(2+) does not appear until the reduction of the oxidized Mn is complete. These results demonstrate that the observed rates of Fe(2+) and sulfide production may underestimate the total rates of Fe and sulfate reduction in those environments containing oxidized Mn. These results also demonstrate the potential impact that a single microbe can exert on sediment geochemistry, and provide the basis for preliminary models of the complexity of microbial and geochemical interactions that occur.
Document ID
19890034479
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Myers, Charles R.
(Wisconsin Univ. Milwaukee, WI, United States)
Nealson, Kenneth H.
(Wisconsin, University Milwaukee, United States)
Date Acquired
August 14, 2013
Publication Date
November 1, 1988
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 52
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
89A21850
Funding Number(s)
CONTRACT_GRANT: NAGW-1047
CONTRACT_GRANT: NSF OCE-86-09778
Distribution Limits
Public
Copyright
Other

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