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New Cyanobacteria Study Findings Recently Were Reported by Researchers at University of Georgia

June 24, 2014

By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Cyanobacteria. According to news reporting originating from Athens, Georgia, by NewsRx correspondents, research stated, "Cyanobacteria possess unique and exciting features among photosynthetic microorganisms for energy conversion applications. This study focuses on production of direct electricity using a cyanobacterium called Nostoc sp. (NOS) as a photo-biocatalyst immobilized on carbon nanotubes on the anode of photo-bioelectrochemical cells."

Our news editors obtained a quote from the research from the University of Georgia, "By illuminating with light (intensity 76 mW cm(-2)) the NOS immobilized on a carbon nanotube (CNT) modified electrode generated a photocurrent density of 30 mA m(-2) at 0.2 V (vs. Ag/AgCl). The contribution of different photosynthetic pigments in NOS to the light capture was analyzed and chlorophyll-a was found to be the major contributor to light capture followed by phycocyanin. Further investigation using a set of inhibitors revealed that the electrons were redirected predominantly from PSII to the CNT through the plastoquinone pool and quinol oxidase. A rudimentary design photosynthetic electrochemical cell has been constructed using NOS/CNT on the anode and laccase/CNT on the cathode as catalysts. The cell generated a maximum current density of 250 mA m(-2) and a peak power density of 35 mW m(-2) without any mediator. By the addition of 1,4-benzoquinone as a redox mediator, the electricity generation capability was significantly enhanced with a current density of 2300 mA m(-2) and a power density of 100 mW m(-2)."

According to the news editors, the research concluded: "The power densities achieved in this work are the highest among 'non-engineered' cyanobacteria based electrochemical systems reported to date."

For more information on this research see: Photocurrent generation by immobilized cyanobacteria via direct electron transport in photo-bioelectrochemical cells. Physical Chemistry Chemical Physics, 2014;16(17):7862-71. (Royal Society of Chemistry -; Physical Chemistry Chemical Physics -

The news editors report that additional information may be obtained by contacting N. Sekar, Nano Electrochemistry Laboratory, College of Engineering, The University of Georgia, Athens, GA 30602, United States. Additional authors for this research include Y. Umasankar and R.P Ramasamy (see also Cyanobacteria).

Keywords for this news article include: Athens, Georgia, Chemistry, United States, Cyanobacteria, Electrochemical, Gram Negative Bacteria, North and Central America, Gram Negative Oxygenic Photosynthetic Bacteria.

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Source: Life Science Weekly

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