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Date:3/10/2014

ill remain on the surface, Girguis said, the microbes have developed an unusual strategy. The microbes seem to take up electrons through naturally occurring conductive minerals. Also, as the microbes pull electrons away from iron, they create iron oxide crystals which precipitate into the soil around them. Over time, those crystals can become conductive and act as "circuits," allowing the microbes to oxidize minerals they otherwise couldn't reach.

"What that does is solve the paradox for this sunlight-dependent organism," Girguis said. "These single-celled microbes that grow in biofilms have come up with a way to electrically reach out and pull electrons from minerals in the soil so they can stay in the sun."

Though he remains skeptical about the efficacy of using microbes capable of performing EET for energy generation via fuel cells, Girguis said there are other applications such as the pharmaceutical industry where the microbes could be put to use.

"I think the biggest applied opportunity here is to use microbes that are capable of taking up electrons to produce something that is of interest," he said, "knowing you can give them electrons to do that through an electrode."


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Contact: Peter Reuell
preuell@fas.harvard.edu
617-496-8070
Harvard University
Source:Eurekalert

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