@article {486,
	title = {Characterization of extracellular minerals produced during dissimilatory Fe(III) and U(VI) reduction at 100 degrees C by Pyrobaculum islandicum.},
	journal = {Geobiology},
	volume = {6},
	year = {2008},
	month = {2008 Mar},
	pages = {147-54},
	abstract = {In order to gain insight into the significance of biotic metal reduction and mineral formation in hyperthermophilic environments, metal mineralization as a result of the dissimilatory reduction of poorly crystalline Fe(III) oxide, and U(VI) reduction at 100 degrees C by Pyrobaculum islandicum was investigated. When P. islandicum was grown in a medium with poorly crystalline Fe(III) oxide as an electron acceptor and hydrogen as an electron donor, the Fe(III) oxide was reduced to an extracellular, ultrafine-grained magnetite with characteristics similar to that found in some hot environments and that was previously thought to be of abiotic origin. Furthermore, cell suspensions of P. islandicum rapidly reduced the soluble and oxidized form of uranium, U(VI), to extracellular precipitates of the highly insoluble U(IV) mineral, uraninite (UO(2)). The reduction of U(VI) was dependent on the presence of hydrogen as the electron donor. These findings suggest that microbes may play a key role in metal deposition in hyperthermophilic environments and provide a plausible explanation for such phenomena as magnetite accumulation and formation of uranium deposits at ca. 100 degrees C.},
	keywords = {Ferric Compounds, Ferumoxytol, Hot Temperature, Hydrogen, Minerals, Oxidation-Reduction, Pyrobaculum, Uranium, X-Ray Diffraction},
	issn = {1472-4669},
	doi = {10.1111/j.1472-4669.2007.00142.x},
	author = {Kashefi, K and Moskowitz, B M and Lovley, D R}
}
@article {524,
	title = {Characterization of metabolism in the Fe(III)-reducing organism Geobacter sulfurreducens by constraint-based modeling.},
	journal = {Appl Environ Microbiol},
	volume = {72},
	year = {2006},
	month = {2006 Feb},
	pages = {1558-68},
	abstract = {Geobacter sulfurreducens is a well-studied representative of the Geobacteraceae, which play a critical role in organic matter oxidation coupled to Fe(III) reduction, bioremediation of groundwater contaminated with organics or metals, and electricity production from waste organic matter. In order to investigate G. sulfurreducens central metabolism and electron transport, a metabolic model which integrated genome-based predictions with available genetic and physiological data was developed via the constraint-based modeling approach. Evaluation of the rates of proton production and consumption in the extracellular and cytoplasmic compartments revealed that energy conservation with extracellular electron acceptors, such as Fe(III), was limited relative to that associated with intracellular acceptors. This limitation was attributed to lack of cytoplasmic proton consumption during reduction of extracellular electron acceptors. Model-based analysis of the metabolic cost of producing an extracellular electron shuttle to promote electron transfer to insoluble Fe(III) oxides demonstrated why Geobacter species, which do not produce shuttles, have an energetic advantage over shuttle-producing Fe(III) reducers in subsurface environments. In silico analysis also revealed that the metabolic network of G. sulfurreducens could synthesize amino acids more efficiently than that of Escherichia coli due to the presence of a pyruvate-ferredoxin oxidoreductase, which catalyzes synthesis of pyruvate from acetate and carbon dioxide in a single step. In silico phenotypic analysis of deletion mutants demonstrated the capability of the model to explore the flexibility of G. sulfurreducens central metabolism and correctly predict mutant phenotypes. These results demonstrate that iterative modeling coupled with experimentation can accelerate the understanding of the physiology of poorly studied but environmentally relevant organisms and may help optimize their practical applications.},
	keywords = {Amino Acids, Electron Transport, Escherichia coli, Fumarates, Geobacter, Iron, Models, Biological, Mutation, Oxidation-Reduction, Phenotype, Protons, Quinones, Species Specificity},
	issn = {0099-2240},
	doi = {10.1128/AEM.72.2.1558-1568.2006},
	author = {Mahadevan, R and Bond, D R and Butler, J E and Esteve-Nu{\~n}ez, A and Coppi, M V and Palsson, B O and Schilling, C H and Lovley, D R}
}
@article {600,
	title = {Comment on "Abiotic controls on H2 production from basalt-water reactions and implications for aquifer biogeochemistry".},
	journal = {Environ Sci Technol},
	volume = {35},
	year = {2001},
	month = {2001 Apr 1},
	pages = {1556-9},
	keywords = {Hydrogen, Minerals, Organic Chemicals, Oxidation-Reduction, Silicates, Water, Water Microbiology},
	issn = {0013-936X},
	author = {Anderson, R T and Chapelle, F H and Lovley, D R}
}
@article {613,
	title = {Characterization of a membrane-bound NADH-dependent Fe(3+) reductase from the dissimilatory Fe(3+)-reducing bacterium Geobacter sulfurreducens.},
	journal = {FEMS Microbiol Lett},
	volume = {185},
	year = {2000},
	month = {2000 Apr 15},
	pages = {205-11},
	abstract = {Geobacter sulfurreducens produces a single, membrane-associated Fe(3+) reductase activity when grown on fumarate or Fe(3+). The activity was initially isolated by solubilization of membranes with the non-ionic detergent dodecyl-beta-D-maltoside, and partially purified by a combination of ion exchange chromatography and preparative non-denaturing gel electrophoresis. Molecular mass of the reductase, as determined by gel filtration chromatography, was approximately 300 kDa. Cofactor analysis of the purified reductase demonstrates that it contains a hemoprotein and flavin adenine dinucleotide. Kinetic and inhibitor studies show that the reductase is specific for NADH as electron donor, and confirm that the reductase enzymatically reduces Fe(3+). The cytochrome associated with the complex undergoes a reoxidation upon addition of Fe(3+) compounds, indicating an ability to pass reducing equivalents to Fe(3+). This is the first description of a purified NADH-dependent Fe(3+) reductase from a microorganism capable of coupling Fe(3+) reduction to growth.},
	keywords = {Cell Membrane, Deltaproteobacteria, Ferric Compounds, FMN Reductase, NADH, NADPH Oxidoreductases, Oxidation-Reduction},
	issn = {0378-1097},
	author = {Magnuson, T S and Hodges-Myerson, A L and Lovley, D R}
}
@article {516,
	title = {Carbohydrate oxidation coupled to Fe(III) reduction, a novel form of anaerobic metabolism.},
	journal = {Anaerobe},
	volume = {4},
	year = {1998},
	month = {1998 Dec},
	pages = {277-82},
	abstract = {An isolate, designated GC-29, that could incompletely oxidize glucose to acetate and carbon dioxide with Fe(III) serving as the electron acceptor was recovered from freshwater sediments of the Potomac River, Maryland. This metabolism yielded energy to support cell growth. Strain GC-29 is a facultatively anaerobic, gram-negative motile rod which, in addition to glucose, also used sucrose, lactate, pyruvate, yeast extract, casamino acids or H2 as alternative electron donors for Fe(III) reduction. Stain GC-29 could reduce NO3(-), Mn(IV), U(VI), fumarate, malate, S2O3(2-), and colloidal S0 as well as the humics analog, 2,6-anthraquinone disulfonate. Analysis of the almost complete 16S rRNA sequence indicated that strain GC-29 belongs in the Shewanella genus in the epsilon subdivision of the Proteobacteria. The name Shewanella saccharophilia is proposed. Shewanella saccharophilia differs from previously described fermentative microorganisms that metabolize glucose with the reduction of Fe(III) because it transfers significantly more electron equivalents to Fe(III); acetate and carbon dioxide are the only products of glucose metabolism; energy is conserved from Fe(III) reduction; and glucose is not metabolized in the absence of Fe(III). The metabolism of organisms like S. saccharophilia may account for the fact that glucose is metabolized primarily to acetate and carbon dioxide in a variety of sediments in which Fe(III) reduction is the terminal electron accepting process.},
	issn = {1075-9964},
	doi = {10.1006/anae.1998.0172},
	author = {Coates, J D and Councell, T and Ellis, D J and Lovley, D R}
}
@article {648,
	title = {Composition of Non-Microbially Reducible Fe(III) in Aquatic Sediments.},
	journal = {Appl Environ Microbiol},
	volume = {59},
	year = {1993},
	month = {1993 Aug},
	pages = {2727-9},
	abstract = {The production of small quantities of Fe(II) during the initial phase of microbial Fe(III) reduction greatly increased the amount of Fe(III) that could be extracted from freshwater sediments with oxalate. This finding and other evidence suggest that the oxalate-extractable Fe(III) that is unavailable for microbial reduction in anoxic sediments is not in the form of mixed Fe(III)-Fe(II) forms, as was previously suggested, but rather is in the form of highly crystalline Fe(III) oxides.},
	issn = {0099-2240},
	author = {Phillips, E J and Lovley, D R and Roden, E E}
}
@article {663,
	title = {Competitive mechanisms for inhibition of sulfate reduction and methane production in the zone of ferric iron reduction in sediments.},
	journal = {Appl Environ Microbiol},
	volume = {53},
	year = {1987},
	month = {1987 Nov},
	pages = {2636-41},
	abstract = {Mechanisms for inhibition of sulfate reduction and methane production in the zone of Fe(III) reduction in sediments were investigated. Addition of amorphic iron(III) oxyhydroxide to sediments in which sulfate reduction was the predominant terminal electron-accepting process inhibited sulfate reduction 86 to 100\%. The decrease in electron flow to sulfate reduction was accompanied by a corresponding increase in electron flow to Fe(III) reduction. In a similar manner, Fe(III) additions also inhibited methane production in sulfate-depleted sediments. The inhibition of sulfate reduction and methane production was the result of substrate limitation, because the sediments retained the potential for sulfate reduction and methane production in the presence of excess hydrogen and acetate. Sediments in which Fe(III) reduction was the predominant terminal electron-accepting process had much lower concentrations of hydrogen and acetate than sediments in which sulfate reduction or methane production was the predominant terminal process. The low concentrations of hydrogen and acetate in the Fe(III)-reducing sediments were the result of metabolism by Fe(III)-reducing organisms of hydrogen and acetate at concentrations lower than sulfate reducers or methanogens could metabolize them. The results indicate that when Fe(III) is in a form that Fe(III)-reducing organisms can readily reduce, Fe(III)-reducing organisms can inhibit sulfate reduction and methane production by outcompeting sulfate reducers and methanogens for electron donors.},
	issn = {0099-2240},
	author = {Lovley, D R and Phillips, E J}
}
