Klueglein, N; Lösekann-Behrens, T; Obst, M; Behrens, S; Appel, E; Kappler, A: Magnetite Formation by the Novel Fe(III)-reducing Geothrix fermentans Strain HradG1 Isolated from a Hydrocarbon-Contaminated Sediment with Increased Magnetic Susceptibility, Geomicrobiology Journal, 30(10), 863-873 (2013), online: 2013-04-05, doi:10.1080/01490451.2013.790922 [Link]
Abstract:

Surface sediments at the former military base Hradcany, Czech Republic, heavily contaminated with hydrocarbons, were remediated over years by air-sparging. The sediments show a strong magnetic enhancement at the groundwater fluctuation zone. Here we describe the isolation of a new Fe(III)-reducing and magnetite-producing bacterial strain Geothrix fermentans HradG1from this magnetic and redox-dynamic layer. This isolation underlines that the genus Geothrix is a relevant group of bacteria in hydrocarbon-contaminated environments that undergo dynamic oxic-anoxic redox fluctuations. The Fe(III)-reducing metabolic activity of these organisms potentially leads to changing magnetic soil properties that can potentially be used to identify biogeochemical hotspots.

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