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Postdoc for sea bed methane cycling by reversible EET

Description A new source of methane was recently discovered in a subsurface zone of the seabed, where the production and oxidation of methane occur concurrently. Preliminary work indicates that archaea and bacteria may here exchange electrons in the sediment through minerals that function as electrical conductors and capacitors. The working hypothesis is that the archaea are able to reverse the direction of their energy metabolism depending on whether they interact with electron accepting or electron donating bacteria. The specific objective is to unravel the processes using sensitive radiotracer experiments and to identify the microbial physiology of archaea involved in this cryptic methane cycling. The results will be of general importance for the understanding of methane biogeochemistry. The project is a collaboration between the University of Southern Denmark and Aarhus University, funded by the Independent Research Fund Denmark. The successful candidate will join an interdisciplinary team covering molecular microbiology, electromicrobiology, microbial physiology and biogeochemistry. We seek a highly motivated candidate with an academic background and documented experience in aquatic microbiology and microbial process studies. Institution contact information Aarhus University, Denmark Contact email address nat-tech.hr.emply@au.dk Deadline 01-10-2021 External link https://international.au.dk/about/profile/vacant-positions/job/postdoctoral-position-on-seabed-methane-cycling-at-the-section-for-microbiology-at-aarhus-university-denmark ...
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Postdoctoral position on electromicrobiological oxygen production in sediment

Description Cable bacteria are filamentous microorganisms that transfer electrons across centimetre-scale distances, coupling distant oxidation and reduction reactions in aquatic sediment. Cable bacteria conserve energy by coupling the oxidation of hydrogen sulfide produced in deeper sediment layers to the reduction of oxygen diffusing into sediment from the overlying water. There is some evidence that under certain circumstances cable bacteria can reverse their oxygen reduction reaction in deep sediment, producing trace amounts of molecular oxygen from water. This oxygen then becomes available for respiration by aerobic bacteria in the surrounding sediment. This phenomenon has the potential to turn our concept of what “anoxic” sediment is upside-down. The successful candidate will investigate this process using a diverse suite of methods, including planar optodes, microsensors, stable isotope labeling, and metatranscriptomics. This position is financed by the Villum Foundation. The successful candidate will work closely with researchers, technicians and students in the Center for Electromicrobiology (http://cem.au.dk), funded by the Danish National Research Foundation, to achieve the project goals. We seek a highly motivated candidate with a background in microbiology, microbial ecology, microbial biogeochemistry, environmental chemistry, environmental science, soil science, marine science, or other related fields. Institution contact information Aarhus University, Denmark Contact email address ...
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