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Oxygen exposure promotes fuel diversity for Shewanella oneidensis microbial fuel cells

“…Using the standard reduction potential for ferricyanide (E • = 430 mV versus NHE (Roncel et al, 2001)) the resting potential for S. oneidensis was −70 ± 1 mV versus NHE and as high as −370 ± 3 mV versus NHE when current was generated. Previously reported electrochemical studies also resulted in standard redox potentials of comparable magnitude (−100 mV versus NHE) for Shewanella and lactate (Kim et al, 1999). The amount of current generated versus time from a single molecule of glucose, ascorbic acid, and fructose, was used to calculate the Coulombic efficiencies shown in Fig.…”

Electrochemical Investigation of Isoprenoid Quinone Productions byShewanella oneidensisMR-1 Detected by Its Destructive Adsorption on an Indium-Tin-Oxide Electrode

“…[22][23][24][25][26][27][28] Yet in the observed event, our approach discussed in this article has a key difference from the commonly used techniques; our technique specifically detects microbial quinones by heating, i.e., the thermal lysis of microbes 29,30 and can acquire accurate information about their respiration mode, as seen in Fig. 4.…”

Effects of oxygen on Shewanella decolorationis NTOU1 electron transfer to carbon-felt electrodes

“…An issue that has not been thoroughly addressed yet is the effects of oxygen on Shewanella's metabolism and electron delivery rate and mechanism at an bio-anode. Some previous studies indicated that electron transfer would be impaired when exposed to oxygen (Kim et al, 1999(Kim et al, , 2002Liu et al, 2005a;Wang et al, 2006), but Biffinger et al (2008) indicated on the contrary that the power output could be promoted by oxygen using Shewanella onedensis DSP10 with glucose as substrate. Although the Entner-Doudoroff pathway was invoked to explain this phenomenon, quantitative data on the bacterium's metabolism would provide stronger evidence.…”

“…Ha et al, 2008;Liu et al, 2005b;Min and Logan, 2004), or alcohols (Kim et al, 2007;Rosenbaum et al, 2006) can be chosen as alternative fuels in such cells. Among all bacteria capable of producing electrical energy, the Shewanella genus is particularly promising and has been widely studied as bio-anode catalyst (Biffinger et al, 2007(Biffinger et al, , 2009Kim et al, 1999Kim et al, , 2002. This genus is known to be able to deliver electrons to a diversity of electron acceptors, including oxidized metals (e.g., Fe(III) and Mn(IV)), fumarate, nitrate, nitrite, sulfite, sulfur, oxygen (Nealson and Scott, 2006), and even protons for hydrogen production (Meshulam-Simon et al, 2007).…”

“…This genus is known to be able to deliver electrons to a diversity of electron acceptors, including oxidized metals (e.g., Fe(III) and Mn(IV)), fumarate, nitrate, nitrite, sulfite, sulfur, oxygen (Nealson and Scott, 2006), and even protons for hydrogen production (Meshulam-Simon et al, 2007). The genus Shewanella holds its strength as a bio-anode catalyst based on the fact that it can transfer electrons extracellularly via an array of mechanisms, including outer membrane-bound cytochromes (Kim et al, 1999(Kim et al, , 2002, conductive pili also known as nanowires (Gorby et al, 2006), and excreted redox compounds such as riboflavin (Marsili et al, 2008) and quinones (Newton et al, 2009). An issue that has not been thoroughly addressed yet is the effects of oxygen on Shewanella's metabolism and electron delivery rate and mechanism at an bio-anode.…”