Extracellular electron transfer mechanisms

Villano, M., and Angenent, LT, (2011) Cathodes as electron donors for microbial metabolism which extracellular electron transfer mechanisms are involved Bioresour. Technol, 102 (1), 324-333. 

Renslow R, Babauta J, Kuprat A, Schenk J, Ivory C, Fredrickson J, Beyenal H. Modeling biofihns with dual extracellular electron transfer mechanisms. Phys Chem Chem Phys 2013 15(44) 19262-19283. 

How Does Biofilm Spatial Activity Affect the Extracellular Electron Transfer Mechanism Current production, while generally attributed to the biofilm as whole, is a product of electrons generated throughout the biofilm and is likely not a spatially homogenous phenomenon. It is important to understand where the electrons come from within the biofilm to optimize these systems. Furthermore, the spatial activity inside the biofilm can provide more clues as to why S. oneidensis may have more than one EET mechanism available simultaneously. One possibility is that cells in the biofilm may produce electrons, but the biofilm may not have the ability to deliver them to the electrode. In this case, having active cells in the... 

Nevin KP, Lovley DR (2002b) Mechanisms for accessing insoluble Fe(III) oxide during dissimilatory Fe(III) reduction by Geothrixfermentans. App Environ Microbio 68 2294-2299 Newman DK, Kolter R (2000) A role for excreted quinones in extracellular electron transfer. Nature 405 94-97... 

High electron discharge capabilities of electrochemically active microbes have a significant impact on the performance of the corresponding MES. To date, three kinds of mechanisms for extracellular electron transfer (EET) involved in MES have been established ... 

To improve MES in the future, more detailed information about electron transfer mechanisms from electrodes to microorganisms is needed. The opposite electron transfer direction - from microorganisms to extracellular substrates, such as minerals or electrodes - has been investigated in detail over last years. It can be assumed that similar principles are involved in MES. Particularly the electron transfer mechanisms of... 

Deeper understanding of EET - only the knowledge of the mechanism of the extracellular electron transfer will enable scientists to design adequate electron transfer relays. 

Microbial fuel cells rely on bioelectrochemical reactions driven by microbial metabolism to produce electricity while degrading organic substrates. Pure culture MFC studies with bacteria such as Geobacter and Shewanella have informed researchers on the mechanisms behind extracellular electron transfer (EET), but it is mixed consortium communities that typically produce the most power and have the most metabolic flexibility to handle a variety of substrates and environmental conditions. 

First we will discuss the similarities and differences between conventional chemical and microbial bioelectrocatalysts. Subsequently, the principal mechanisms of the extracellular electron transfer (EET) and the technology aiming at their exploitation will be introduced. Finally, the biological and electrochemical methods that allow the analysis of the microbial electron transfer and identification of the respective mediators, proteins, and microorganisms will be addressed. 

Mechanism of Electron-transfer in Peroxidases Peroxidases have been divided into three categories [255]. These are Class I, the intercellular peroxidases, Class II, the extracellular peroxidases and Class III, the well-known extracellular plant peroxidases. The peroxidases in Class I, II, and III differ in the number of disulfide bonds and bound calcium ions,... 

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