(2020) Revealing Biomineralization and SOM-Mineral Associations with Chemical Imaging Methods
Dohnalkova A, Kovarik L, Varga T, Battu AK, Jiao Y, Park D, Marcus M, Krivanek O, Lovejoy T & Kukkadapu R
06l: Room 2, Thursday 25th June 00:33 - 00:36
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Hi, Thanks for the informative presentation and beautiful images. Is the Ca imaged near the bacterial cell (2nd experiment) all associated with mineral calcite? If so, is the bacteria is creating biogenic calcite (a phenomenon that is know to occur in several genera of bacteria)? Do you mean to imply that the Ca SOM "bridge" is calcite?
Thanks very much! Yes, I think we’re seeing microbially-induced calcite on the surfaces of the mineral-encrusted bugs. In fact, we see some of the bacteria are encrusted in needle-like crystals which we analyzed by EDS as CaCO3. More analyses like micro-SAD (diffraction) are needed to identify it for sure. I wish I knew more about the Ca bridge; one of the comments was the role of Fe3+-carboxylate and Fe3+-phosphoryl interactions may be also critical here. So it's probably not that simple. Please let me know your thoughts - thank you!
Thank you for the presentation, really interesting talk. I want to ask about your the first part of your talk. Can you describe how long it took to get the REE needles you showed? Also, Do you know what happens as time goes on? Do the needles get larger or do new ones form? Also, is there a point where REEs are no longer removed from the solution?
I asked my LLNL collaborators who ran the expt, and this is their reply : <
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