Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006gecoa..70.5842b&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 70, Issue 23, p. 5842-5854.
Other
5
Scientific paper
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, Mmax, the attachment constant, KP, and the first-order Fe(III) reduction rate constant, k, the model reproduces the initial reduction rates of a variety of fine-grained Fe(III) oxyhydroxides by S. putrefaciens. The model explains the observed dependency of the apparent Fe(III) half-saturation constant, Km∗, on the solid to cell ratio, and it predicts that initial iron reduction rates exhibit saturation with respect to both the cell density and the abundance of the Fe(III) oxyhydroxide substrate.
Behrends Thilo
Bonneville Steeve
Hyacinthe Christelle
Röling Wilfred F. M.
Van Cappellen Philippe
No associations
LandOfFree
Reduction of Fe(III) colloids by Shewanella putrefaciens: A kinetic model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Reduction of Fe(III) colloids by Shewanella putrefaciens: A kinetic model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reduction of Fe(III) colloids by Shewanella putrefaciens: A kinetic model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1543996