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CHEM., vol. 43, no. 10, 1979, pages 2083-2086, XP002123561 cited in the application;  M L FULTZ ET AL: "Mediator compounds for the electrochemical study of biological redox systems: a compilation" ANALYTICA CLINICA ACTA, vol. 140, 1982, pages 1-12, XP000853623 Amsterdam, NL;  PARK D H ET AL: "Microbial Utilization of Electrically Reduced Neutral Red as the Sole Electron Donor for Growth and Metabolite Production" APPLIED AND ENVIRONMENTAL MICROBIOLOGY, vol. 65, no. 7, July 1999 (1999-07), pages 2912-2917, XP000852770 Washington DC, USA cited in the application;  PARK D H ET AL: "Utilization of Electrically Reduced Neutral Red by Actinobacillus Succinogenes: Physiological Function of Neutral Red in Membrane-driven Fumarate Reduction and Energy Conversion" J BACTERIOL.,April 1999 (1999-04), pages 2403-2410, XP000852775 Washington DC, USA cited in the application;  SHEN G J ET AL: "Biochemical Route and Control of Butyrate Synthesis in Butyribacterium-methylotropicum" APLIED MICROBIOLOGY AND BIOTECHNOLOGY, vol. 45, no. 3, April 1996 (1996-04), pages 355-362, XP000852805