Electron Transfer between Physically Bound Electron Donors and Acceptors: A Fluorescence Blob Model Approach

2010 ◽  
Vol 114 (44) ◽  
pp. 13950-13960 ◽  
Author(s):  
Christine Keyes Baig ◽  
Jean Duhamel
Keyword(s):  
Electron Transfer ◽  
Electron Donors ◽  
Blob Model ◽  
Bound Electron ◽  
Model Approach

scholarly journals Lack of Electricity Production by Pelobacter carbinolicus Indicates that the Capacity for Fe(III) Oxide Reduction Does Not Necessarily Confer Electron Transfer Ability to Fuel Cell Anodes

2007 ◽  
Vol 73 (16) ◽  
pp. 5347-5353 ◽  
Author(s):  
Hanno Richter ◽  
Martin Lanthier ◽  
Kelly P. Nevin ◽  
Derek R. Lovley
Keyword(s):  
Electron Transfer ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Microbial Fuel Cells ◽  
Electron Donors ◽  
Rrna Genes ◽  
Anode Surface ◽  
Oxide Reduction ◽  
Fuel Cell Anodes

ABSTRACT The ability of Pelobacter carbinolicus to oxidize electron donors with electron transfer to the anodes of microbial fuel cells was evaluated because microorganisms closely related to Pelobacter species are generally abundant on the anodes of microbial fuel cells harvesting electricity from aquatic sediments. P. carbinolicus could not produce current in a microbial fuel cell with electron donors which support Fe(III) oxide reduction by this organism. Current was produced using a coculture of P. carbinolicus and Geobacter sulfurreducens with ethanol as the fuel. Ethanol consumption was associated with the transitory accumulation of acetate and hydrogen. G. sulfurreducens alone could not metabolize ethanol, suggesting that P. carbinolicus grew in the fuel cell by converting ethanol to hydrogen and acetate, which G. sulfurreducens oxidized with electron transfer to the anode. Up to 83% of the electrons available in ethanol were recovered as electricity and in the metabolic intermediate acetate. Hydrogen consumption by G. sulfurreducens was important for ethanol metabolism by P. carbinolicus. Confocal microscopy and analysis of 16S rRNA genes revealed that half of the cells growing on the anode surface were P. carbinolicus, but there was a nearly equal number of planktonic cells of P. carbinolicus. In contrast, G. sulfurreducens was primarily attached to the anode. P. carbinolicus represents the first Fe(III) oxide-reducing microorganism found to be unable to produce current in a microbial fuel cell, providing the first suggestion that the mechanisms for extracellular electron transfer to Fe(III) oxides and fuel cell anodes may be different.

scholarly journals Dual Roles for Potassium Hydride in Haloarene Reduction: CSNAr and Single Electron Transfer Reduction via Organic Electron Donors Formed in Benzene

2018 ◽  
Vol 140 (36) ◽  
pp. 11510-11518 ◽  
Author(s):  
Joshua P. Barham ◽  
Samuel E. Dalton ◽  
Mark Allison ◽  
Giuseppe Nocera ◽  
Allan Young ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Electron Donors ◽  
Single Electron ◽  
Single Electron Transfer ◽  
Dual Roles ◽  
Organic Electron ◽  
Potassium Hydride

Photolysis of water for H 2 production with the use of biological and artificial catalysts

1980 ◽  
Vol 295 (1414) ◽  
pp. 473-476 ◽  
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Bovine Serum Albumin ◽  
Bovine Serum ◽  
Methyl Viologen ◽  
Electron Donors ◽  
Organic Electron ◽  
Aqueous Mixture ◽  
The Stability ◽  
Electron Carriers

An aqueous mixture of chloroplasts, hydrogenase and an electron transfer catalyst on illumination liberates H 2 , the source of the H atoms being water. The rate and duration of H 2 production from such a system depends on the stability of chloroplast and hydrogenase activities in light and oxygen. Both chloroplasts and hydrogenases can be stabilized to a certain degree by immobilization in gels or by incubation in bovine serum albumin. Natural electron carriers of hydrogenases are ferredoxin, cytochrome c 3 and NAD. Viologen dyes and synthetic iron-sulphur particles (Jeevanu) can substitute for the biological carriers. Methyl viologen, photoreduced in the presence of chloroplasts, can liberate H 2 in combination with Pt (Adam’s catalyst). An aqueous solution of proflavine can be photoreduced in the presence of organic electron donors such as EDTA, cysteine, dithiothreitol, etc.; the reduced proflavine can subsequently liberate H 2 with MV-Pt, MV-hydrogenase, ferredoxin-hydrogenase or cytochrome-hydrogenase systems.

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