@article {3045,
	title = {H Is a Major Intermediate in  Corrosion of Iron.},
	journal = {mBio},
	volume = {14},
	year = {2023},
	month = {2023 Apr 25},
	pages = {e0007623},
	abstract = {<p>Desulfovibrio vulgaris has been a primary pure culture sulfate reducer for developing microbial corrosion concepts. Multiple mechanisms for how it accepts electrons from Fe have been proposed. We investigated Fe oxidation with a mutant of  in which hydrogenase genes were deleted. The hydrogenase mutant grew as well as the parental strain with lactate as the electron donor, but unlike the parental strain, it was not able to grow on H. The parental strain reduced sulfate with Fe as the sole electron donor, but the hydrogenase mutant did not. H accumulated over time in Fe cultures of the hydrogenase mutant and sterile controls but not in parental strain cultures. Sulfide stimulated H production in uninoculated controls apparently by both reacting with Fe to generate H and facilitating electron transfer from Fe to H. Parental strain supernatants did not accelerate H production from Fe, ruling out a role for extracellular hydrogenases. Previously proposed electron transfer between Fe and  via soluble electron shuttles was not evident. The hydrogenase mutant did not reduce sulfate in the presence of Fe and either riboflavin or anthraquinone-2,6-disulfonate, and these potential electron shuttles did not stimulate parental strain sulfate reduction with Fe as the electron donor. The results demonstrate that  primarily accepts electrons from Fe via H as an intermediary electron carrier. These findings clarify the interpretation of previous  corrosion studies and suggest that H-mediated electron transfer is an important mechanism for iron corrosion under sulfate-reducing conditions.  Microbial corrosion of iron in the presence of sulfate-reducing microorganisms is economically significant. There is substantial debate over how microbes accelerate iron corrosion. Tools for genetic manipulation have only been developed for a few Fe(III)-reducing and methanogenic microorganisms known to corrode iron and in each case those microbes were found to accept electrons from Fe via direct electron transfer. However, iron corrosion is often most intense in the presence of sulfate-reducing microbes. The finding that Desulfovibrio vulgaris relies on H to shuttle electrons between Fe and cells revives the concept, developed in some of the earliest studies on microbial corrosion, that sulfate reducers consumption of H is a major microbial corrosion mechanism. The results further emphasize that direct Fe-to-microbe electron transfer has yet to be rigorously demonstrated in sulfate-reducing microbes.</p>},
	keywords = {Corrosion, Desulfovibrio, Desulfovibrio vulgaris, Hydrogenase, Iron, Lactic Acid, Oxidation-Reduction, Sulfates},
	issn = {2150-7511},
	doi = {10.1128/mbio.00076-23},
	author = {Woodard, Trevor L and Ueki, Toshiyuki and Lovley, Derek R}
}
@article {494,
	title = {Growth with high planktonic biomass in Shewanella oneidensis fuel cells.},
	journal = {FEMS Microbiol Lett},
	volume = {278},
	year = {2008},
	month = {2008 Jan},
	pages = {29-35},
	abstract = {Shewanella oneidensis MR-1 grew for over 50 days in microbial fuel cells, incompletely oxidizing lactate to acetate with high recovery of the electrons derived from this reaction as electricity. Electricity was produced with lactate or hydrogen and current was comparable to that of electricigens which completely oxidize organic substrates. However, unlike fuel cells with previously described electricigens, in which cells are primarily attached to the anode, at least as many of the S. oneidensis cells were planktonic as were attached to the anode. These results demonstrate that S. oneidensis may conserve energy for growth with an electrode serving as an electron acceptor and suggest that multiple strategies for electron transfer to fuel cell anodes exist.},
	keywords = {Bioelectric Energy Sources, Electricity, Electron Transport, Lactic Acid, Plankton, Shewanella},
	issn = {0378-1097},
	doi = {10.1111/j.1574-6968.2007.00964.x},
	author = {Lanthier, Martin and Gregory, Kelvin B and Lovley, Derek R}
}
