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Study in Science finds missing piece of biogeochemical puzzle in aquifers
Date:5/1/2014

eory, in which microorganisms compete, survival-of-the-fittest style, and one type of organism comes out dominant," Flynn said. Rather, the iron-breathing and the sulfate-breathing microbes depend on each other to survive.

Understanding this complex interplay is particularly important for sequestering carbon. The idea is that in order to keep harmful carbon dioxide out of the atmosphere, we would compress and inject it into deep underground aquifers. In theory, the carbon would react with iron and other compounds, locking it into solid minerals that wouldn't seep to the surface.

Iron is one of the major players in this scenario, and it must be in its reactive state for carbon to interact with it to form a solid mineral. Microorganisms are essential in making all that reactive iron. Therefore, understanding that sulfurand the microbe junkies who depend on itplays a role in this process is a significant chunk of the puzzle that has been missing until now.

The study, "Sulfur-Mediated Electron Shuttling During Bacterial Iron Reduction," appears online today in the May 1 edition of Science Express and will be published in Science at the end of the month. Other authors on the study were Argonne scientists Bhoopesh Mishra (also of the Illinois Institute of Technology) and Edward O'Loughlin and Georgia Tech scientist Thomas DiChristina.


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Contact: Brian Grabowski
bgrabowski@anl.gov
630-252-1232
DOE/Argonne National Laboratory
Source:Eurekalert

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