Marine phototrophic consortia transfer electrons to electrodes in response to reductive stress

Darus, Libertus, Ledezma, Pablo, Keller, Jurg and Freguia, Stefano (2015) Marine phototrophic consortia transfer electrons to electrodes in response to reductive stress. Photosynthesis Research, 127 3: 347-354. doi:10.1007/s11120-015-0193-y


Author Darus, Libertus
Ledezma, Pablo
Keller, Jurg
Freguia, Stefano
Title Marine phototrophic consortia transfer electrons to electrodes in response to reductive stress
Journal name Photosynthesis Research   Check publisher's open access policy
ISSN 0166-8595
1573-5079
Publication date 2015-09-25
Sub-type Article (original research)
DOI 10.1007/s11120-015-0193-y
Open Access Status Not Open Access
Volume 127
Issue 3
Start page 347
End page 354
Total pages 8
Place of publication Dordrecht, Netherlands
Publisher Springer
Collection year 2016
Language eng
Formatted abstract
This work studies how extracellular electron transfer (EET) from cyanobacteria-dominated marine microbial biofilms to solid electrodes is affected by the availability of inorganic carbon (Ci). The EET was recorded chronoamperometrically in the form of electrical current by a potentiostat in two identical photo-electrochemical cells using carbon electrodes poised at a potential of +0.6 V versus standard hydrogen electrode under 12/12 h illumination/dark cycles. The Ci was supplied by the addition of NaHCO3 to the medium and/or by sparging CO2 gas. At high Ci conditions, EET from the microbial biofilm to the electrodes was observed only during the dark phase, indicating the occurrence of a form of night-time respiration that can use insoluble electrodes as the terminal electron acceptor. At low or no Ci conditions, however, EET also occurred during illumination suggesting that, in the absence of their natural electron acceptor, some cyanobacteria are able to utilise solid electrodes as an electron sink. This may be a natural survival mechanism for cyanobacteria to maintain redox balance in environments with limiting CO2 and/or high light intensity
Keyword Biophotovoltaics
Microbial solar cell
Marine photosynthetic bacteria
Extracellular electron transfer
Excess electron dissipation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
Advanced Water Management Centre Publications
 
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Created: Mon, 26 Oct 2015, 12:34:36 EST by Pablo Ledezma on behalf of Advanced Water Management Centre