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Ferrihydrite-dependent growth of Sulfurospirillum deleyianum through electron transfer via sulfur cycling

Ferrihydrite-dependent growth of Sulfurospirillum deleyianum through electron transfer via sulfur cycling

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STRAUB, Kristina Lotte, Bernhard SCHINK, 2004. Ferrihydrite-dependent growth of Sulfurospirillum deleyianum through electron transfer via sulfur cycling. In: Applied and Environmental Microbiology. 70(10), pp. 5744-5749. ISSN 0099-2240. Available under: doi: 10.1128/AEM.70.10.5744-5749.2004

@article{Straub2004Ferri-8599, title={Ferrihydrite-dependent growth of Sulfurospirillum deleyianum through electron transfer via sulfur cycling}, year={2004}, doi={10.1128/AEM.70.10.5744-5749.2004}, number={10}, volume={70}, issn={0099-2240}, journal={Applied and Environmental Microbiology}, pages={5744--5749}, author={Straub, Kristina Lotte and Schink, Bernhard} }

2011-03-24T17:44:59Z Schink, Bernhard Straub, Kristina Lotte eng Observations in enrichment cultures of ferric iron-reducing bacteria indicated sulfide as the reductant. Ferric iron reduction via sulfur cycling was investigated in more detail with Sulfurospirillum deleyianum, which can utilize sulfur or thiosulfate as an electron acceptor. In the presence of cysteine (0.5 or 2 mM) as the sole sulfur source, no (microbial) reduction of ferrihydrite or ferric citrate was observed, indicating that S. deleyianum is unable to use ferric iron as an immediate electron acceptor. However, with thiosulfate at a low concentration (0.05 mM), growth with ferrihydrite(6 mM)was possible and sulfur was cycled up to 60 times. Also, spatially distant ferrihydrite in agar<br />cultures was reduced via diffusible sulfur species. Due to the low concentrations of thiosulfate, S. deleyianum produced only small amounts of sulfide. Obviously, sulfide delivered electrons to ferrihydrite with no or only<br />little precipitation of black iron sulfides. Ferrous iron and oxidized sulfur species were produced instead, and the latter served again as the electron acceptor. These oxidized sulfur species have not yet been identified. However, sulfate and sulfite cannot be major products of ferrihydrite-dependent sulfide oxidation, since neither compound can serve as an electron acceptor for S. deleyianum. Instead, sulfur (elemental S or polysulfides) and/or thiosulfate as oxidized products could complete a sulfur cycle-mediated reduction of ferrihydrite. Schink, Bernhard application/pdf 2011-03-24T17:44:59Z Ferrihydrite-dependent growth of Sulfurospirillum deleyianum through electron transfer via sulfur cycling Straub, Kristina Lotte First publ. in: Applied and Environmental Microbiology 70 (2004), 10, pp. 5744-5749 deposit-license 2004

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