Reduction of Fe(III) colloids by Shewanella putrefaciens: a kinetic model.

S. Bonneville; T. Behrends; P. van Cappellen; C. Hyacinthe; W.F.M. Roling

doi:10.1016/j.gca.2006.04.029

Reduction of Fe(III) colloids by Shewanella putrefaciens: a kinetic model.

S. Bonneville, T. Behrends, P. van Cappellen, C. Hyacinthe, W.F.M. Roling

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Abstract

A kinetic model for the microbial reduction of Fe(III) oxyhydroxide colloids in the presence of excess electron donor is presented. The model assumes a two-step mechanism: (1) attachment of Fe(III) colloids to the cell surface and (2) reduction of Fe(III) centers at the surface of attached colloids. The validity of the model is tested using Shewanella putrefaciens and nanohematite as model dissimilatory iron reducing bacteria and Fe(III) colloidal particles, respectively. Attachment of nanohematite to the bacteria is formally described by a Langmuir isotherm. Initial iron reduction rates are shown to correlate linearly with the relative coverage of the cell surface by nanohematite particles, hence supporting a direct electron transfer from membrane-bound reductases to mineral particles attached to the cells. Using internally consistent parameter values for the maximum attachment capacity of Fe(III) colloids to the cells, M

Original language	English
Pages (from-to)	5842-5854
Number of pages	13
Journal	Geochimica et Cosmochimica Acta
Volume	70
DOIs	https://doi.org/10.1016/j.gca.2006.04.029
Publication status	Published - 2006

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10.1016/j.gca.2006.04.029

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title = "Reduction of Fe(III) colloids by Shewanella putrefaciens: a kinetic model.",

abstract = "A kinetic model for the microbial reduction of Fe(III) oxyhydroxide colloids in the presence of excess electron donor is presented. The model assumes a two-step mechanism: (1) attachment of Fe(III) colloids to the cell surface and (2) reduction of Fe(III) centers at the surface of attached colloids. The validity of the model is tested using Shewanella putrefaciens and nanohematite as model dissimilatory iron reducing bacteria and Fe(III) colloidal particles, respectively. Attachment of nanohematite to the bacteria is formally described by a Langmuir isotherm. Initial iron reduction rates are shown to correlate linearly with the relative coverage of the cell surface by nanohematite particles, hence supporting a direct electron transfer from membrane-bound reductases to mineral particles attached to the cells. Using internally consistent parameter values for the maximum attachment capacity of Fe(III) colloids to the cells, M",

author = "S. Bonneville and T. Behrends and {van Cappellen}, P. and C. Hyacinthe and W.F.M. Roling",

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language = "English",

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T1 - Reduction of Fe(III) colloids by Shewanella putrefaciens: a kinetic model.

AU - Bonneville, S.

AU - Behrends, T.

AU - van Cappellen, P.

AU - Hyacinthe, C.

AU - Roling, W.F.M.

PY - 2006

Y1 - 2006

N2 - A kinetic model for the microbial reduction of Fe(III) oxyhydroxide colloids in the presence of excess electron donor is presented. The model assumes a two-step mechanism: (1) attachment of Fe(III) colloids to the cell surface and (2) reduction of Fe(III) centers at the surface of attached colloids. The validity of the model is tested using Shewanella putrefaciens and nanohematite as model dissimilatory iron reducing bacteria and Fe(III) colloidal particles, respectively. Attachment of nanohematite to the bacteria is formally described by a Langmuir isotherm. Initial iron reduction rates are shown to correlate linearly with the relative coverage of the cell surface by nanohematite particles, hence supporting a direct electron transfer from membrane-bound reductases to mineral particles attached to the cells. Using internally consistent parameter values for the maximum attachment capacity of Fe(III) colloids to the cells, M

AB - A kinetic model for the microbial reduction of Fe(III) oxyhydroxide colloids in the presence of excess electron donor is presented. The model assumes a two-step mechanism: (1) attachment of Fe(III) colloids to the cell surface and (2) reduction of Fe(III) centers at the surface of attached colloids. The validity of the model is tested using Shewanella putrefaciens and nanohematite as model dissimilatory iron reducing bacteria and Fe(III) colloidal particles, respectively. Attachment of nanohematite to the bacteria is formally described by a Langmuir isotherm. Initial iron reduction rates are shown to correlate linearly with the relative coverage of the cell surface by nanohematite particles, hence supporting a direct electron transfer from membrane-bound reductases to mineral particles attached to the cells. Using internally consistent parameter values for the maximum attachment capacity of Fe(III) colloids to the cells, M

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DO - 10.1016/j.gca.2006.04.029

M3 - Article

SN - 0016-7037

VL - 70

SP - 5842

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JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

ER -

Reduction of Fe(III) colloids by Shewanella putrefaciens: a kinetic model.

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