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  • Title: Shewanella frigidimarina microbial fuel cells and the influence of divalent cations on current output.
    Author: Fitzgerald LA, Petersen ER, Leary DH, Nadeau LJ, Soto CM, Ray RI, Little BJ, Ringeisen BR, Johnson GR, Vora GJ, Biffinger JC.
    Journal: Biosens Bioelectron; 2013 Feb 15; 40(1):102-9. PubMed ID: 22796023.
    Abstract:
    The genes involved in the proposed pathway for Shewanella extracellular electron transfer (EET) are highly conserved. While extensive studies involving EET from a fresh water Shewanella microbe (S. oneidensis MR-1) to soluble and insoluble electron acceptors have been published, only a few reports have examined EET from marine strains of Shewanella. Thus, Shewanella frigidimarina (an isolate from Antarctic Sea ice) was used within miniature microbial fuel cells (mini-MFC) to evaluate potential power output. During the course of this study several distinct differences were observed between S. oneidensis MR-1 and S. frigidimarina under comparable conditions. The maximum power density with S. frigidimarina was observed when the anolyte was half-strength marine broth (1/2 MB) (0.28 μW/cm(2)) compared to Luria-Bertani (LB) (0.07 μW/cm(2)) or a defined growth minimal medium (MM) (0.02 μW/cm(2)). The systematic modification of S. frigidimarina cultured in 1/2 MB and LB with divalent cations shows that a maximum current output can be generated independent of internal ionic ohmic losses and the presence of external mediators.
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