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Appl Environ Microbiol. 1999 Sep;65(9):4252-4.

Role of humic-bound iron as an electron transfer agent in dissimilatory Fe(III) reduction.

Author information

  • 1Department of Microbiology, University of Massachusetts, Amherst, Massachusetts 01337, USA. dlovley@microbio.umass.edu

Abstract

The dissimilatory Fe(III) reducer Geobacter metallireducens reduced Fe(III) bound in humic substances, but the concentrations of Fe(III) in a wide range of highly purified humic substances were too low to account for a significant portion of the electron-accepting capacities of the humic substances. Furthermore, once reduced, the iron in humic substances could not transfer electrons to Fe(III) oxide. These results suggest that other electron-accepting moieties in humic substances, such as quinones, are the important electron-accepting and shuttling agents under Fe(III)-reducing conditions.

PMID:
10473447
PMCID:
PMC99772
[PubMed - indexed for MEDLINE]
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