title: Differential biofilms characteristics of Shewanella decolorationis microbial fuel cells under open and closed circuit conditions.
abstract: Biofilms formation capacities of Shewanella species in microbial fuel cells (MFCs) and their roles in current generation have been documented to be species-dependent. Understandings of the biofilms growth and metabolism are essential to optimize the current generation of MFCs. Shewanella decolorationis S12 was used in both closed-circuit and open-circuit MFCs in this study. The anodic S. decolorationis S12 biofilms could generate fivefold more current than the planktonic cells, playing a dominant role in current generation. Anodic biofilms viability was sustained at 98 ± 1.2% in closed-circuit while biofilms viability in open-circuit decreased to 72 ± 7% within 96 h. The unviable domain in open-circuit MFCs biofilms majorly located at the inner layer of biofilm. The decreased biofilms viability in open-circuit MFCs could be recovered by switching into closed-circuit, indicating that the current-generating anode in MFCs could serve as a favorable electron acceptor and provide sufficient energy to support cell growth and metabolism inside biofilms.
authors.affiliation: School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510070, China.
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Yang
authors.forename: Guoping
authors.initials: G
authors.lastname: Sun
authors.forename: Jun
authors.initials: J
authors.lastname: Guo
authors.forename: Meiying
authors.initials: M
authors.lastname: Xu
mesh_terms: D001674:Bioelectric Energy Sources / Q000382:microbiology*; D018441:Biofilms / Q000254:growth & development*; D004560:Electricity; D004566:Electrodes; D050296:Microbial Viability; D018613:Microscopy, Confocal; D010933:Plankton / Q000166:cytology / Q000378:metabolism; D020592:Shewanella / Q000166:cytology / Q000502:physiology*