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Reductive dissolution of Fe(III) oxides by Pseudomonas sp. 200

Arnold, Robert G. and DiChristina, Thomas J. and Hoffmann, Michael R. (1988) Reductive dissolution of Fe(III) oxides by Pseudomonas sp. 200. Biotechnology and Bioengineering, 32 (9). pp. 1081-1096. ISSN 0006-3592. doi:10.1002/bit.260320902.

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The kinetics and mechanism of reductive dissolution of Fe(III) oxides were examined in pure, batch cultures of Pseudomonas sp. 200. Primary factors controlling hematite dissolution kinetics were mineral surface area (or concentration of high-energy surface sites), ligand concentration, and cell number. In the presence of nitrilotriacetic acid (NTA), saturation kinetics were apparent in the relationship governing reductive dissolution of hematite. A kinetic expression was developed in which overall iron-reduction rate is functionally related to the concentrations of both NTA and Fe(III). Addition of NTA resulted in a 20-fold increase in the microbial rate of mineral (reductive) dissolution. Mechanisms in which NTA served as a bridging ligand, shuttling respiratory electrons from the membrane-bound microbial electron transport chain to the metal center of the iron oxide, or accelerated the departure of Fe(II) centers (bound to ligand) from the oxide surface following reduction have been postulated. Experimental results indicated that cell–mineral contact was essential for reductive dissolution of goethite.

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Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 1988 John Wiley & Sons. Manuscript Accepted: 26 NOV 1986.
Issue or Number:9
Record Number:CaltechAUTHORS:20151214-160209342
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Official Citation:Arnold, R. G., DiChristina, T. J. and Hoffmann, M. R. (1988), Reductive dissolution of fe(III) oxides by Pseudomonas sp. 200. Biotechnol. Bioeng., 32: 1081–1096. doi: 10.1002/bit.260320902
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62907
Deposited By: George Porter
Deposited On:15 Dec 2015 00:10
Last Modified:10 Nov 2021 23:08

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