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microscopy, we demonstrated a close association of the extracellular UO2 nanoparticles with
MtrC and OmcA. This was the first study to directly localize the OM-associated cytochromes
with extracellular EPS, as a glycocalyx-like structure, which contains biogenic UO2
Although funding for this project has been terminated, we intend to submit a follow up proposal
to further investigate these observations. Specifically, we have observed similar lags in
reduction of Fe in fine-particle lepidocrocite. In addition, past investigations showed that poorly
crystalline ferrihydrite strongly inhibited bioreduction and reoxidized U(IV). To address this
issue, we will propose to investigate longer incubation times, the use of different bacterial strains
(S. putrefaciens CN32, Geobacter spp., and Anaeromyxobacter spp.), and alternative iron
(hydr)oxide thin films for these experiments.
K. M. Kemner, E. J. O'Loughlin, S. D. Kelly, B. Ravel, M. Boyanov, D. Sholto-Douglas, B. Lai,
R. Cook, E. Carpenter, V. Harris, K. H. Nealson, "XAFS And X-ray And Electron Microscopy
Investigations Of Radionuclide Transformations At The Mineral-Microbe Interface" submitted
to American Institute of Physics International XAFS Conference Proceedings.
M. J. Marshall, A. S. Beliaev, A. C. Dohnalkova, D. W. Kennedy, L. Shi, Z. Wang, M. I.
Boyanov, B. Lai, K. M. Kemner, J. S. McLean, S. B. Reed, D. E. Culley, V. L. Bailey, C. J.
Simonson, D. A. Saffarini, M. F. Romine, Y. Gorby, J. M. Zachara, J. K. Fredrickson, "c-Type
Cytochrome-Dependent Formation of U(IV) Nanoparticles by Shewanella oneidensis," P/oS
Biology, Vol. 4, Issue 8.
K. M. Kemner, S. D. Kelly, B. Lai, J. Maser, E. J. O'Loughlin, D. Sholto-Douglas, Z. Cai, M. A.
Schneegurt, C. F. Kulpa, Jr., K. H. Nealson, "Elemental and Redox Analysis of Single Bacterial
Cells by X-ray Microbeam Analysis," SCIENCE, 306 686-687, 2004
K. M. Kemner, S. D. Kelly, E. J. O'Loughlin, T. Khare, Y. Londer, M. Schiffer, L. A. Moe, B.
G. Fox, M. I Donnelly, and C. S. Giometti, "XRF and XAFS Analysis of Electrophoretically
Isolated Nondenatured Proteins," Physica Scripta T115 940-942, 2005.
K. M. Kemner, E. J. O'Loughlin, S. D. Kelly, M. I. Boyanov, "Synchrotron x-ray investigations
of mineral-microbe-metal interactions," Elements August, 2005, pg. 217-221.
K. M. Kemner and S. D. Kelly, "Synchrotron-based Techniques for Monitoring Metal
Tranformations," Manual of Environmental Microbiology, Third Edition.
K. M. Kemner, "Molecular Environmental Science: From X-rays to Biogeochemistry to
Beethoven," Fermi National Laboratory Colloquium, Batavia, Illinois, September 20, 2006.
K. M. Kemner, "Biogeochemistry studies using x-ray fluorescence micro(spectro)scopy," Hasy
Lab, Hamburg, Germany, September 9-13, 2006. (invited)
K. M. Kemner, "X-ray microscopy analysis of bacterial cells," Microscopy and Microanalysis
2006, Chicago, Illinois, August 3, 2006. (invited)
K. M. Kemner, "The role of synchrotron-based research on soil physicochemical and biological
interfacial interactions pertaining to metals and metalloids in the environment,"
International Union of Soil Science World Congress Meeting, Philadelphia, Pennsylvania,
July 10-14, 2006. (invited)
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Kemner, K.M.; O'Loughlin, E.J.; Kelly, S.D. & Nealson, K.H. An integrated approach to characterization of microbial exudates and investigation of their role in the spatial distribution and transformations of uranium at the mineral-microbe interface, report, June 1, 2006; Argonne, Illinois. (digital.library.unt.edu/ark:/67531/metadc879030/m1/4/: accessed August 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.