Publications and Presentations at Scientific Meetings

Calendar Year 2014:

Denotes papers on which a university or other collaborator was the lead author.

  1. Alessi D.S., J.S. Lezama-Pacheco, J.E. Stubbs, M. Janousch, J.R. Bargar, P. Persson, and R. Bernier-Latmani  (2014) The product of microbial uranium reduction includes multiple species with U(IV)-phosphate coordination, Geochim. Cosmochim. Acta, in press.
  2. Qafoku, N.P., B.N. Gartman, R.K. Kukkadapu, B.W. Arey, K.H. Williams, P.J. Mouser, S.M. Heald, J.R. Bargar, N. Janot, S. Yabusaki, and P.E. Long (2014) Geochemical and mineralogical investigation of uranium in multi-element contaminated, organic-rich subsurface sediment, Appl. Geochem., 42: 77–85. DOI: 10.1016/j.apgeochem.2013.12.001.

Calendar Year 2013:

  1. Bargar, J.R., K.H. Williams, K.M. Campbell, P.E. Long, J.E. Stubbs, E. Suvorova, D.S. Alessi, M. Stylo, and R. Bernier-Latmani (2013) Uranium redox transition pathways in acetate-amended sediments, Proceedings of the National Academy of Sciences 110(12): 4506-4511. DOI: 10.1073/pnas.1219198110.
  2. Stylo, M., D.S. Alessi, P.P. Shao, J.S. Lezama-Pacheco, J.R. Bargar, and R. Bernier-Latmani. Biogeochemical controls on the product of microbial U(VI) reduction, Environ. Sci. & Technol. 47(21): 12351-12358. DOI: 201310.1021/es402631w.
  3. Cerrato, J.M., M.N. Ashner, D.S. Alessi, J.S. Lezama-Pacheco, R. Bernier-Latmani, J.R. Bargar, and D.E. Giammar (2013) Relative reactivity of uraninite and non-crystalline U(IV) species, Environ. Sci. & Technol.. 47 (17): 9756–9763. DOI: 10.1021/es401663t.
  4. Alessi, D.S., B. Uster, C. Borca, D. Grolimund and R. Bernier-Latmani (2013) Beam induced oxidation of monomeric U(IV) species, J. Synchrotron Radiation  20(1): 197-199. DOI: 10.1107/S0909049512041763.
  5. Wang, Z. S.-W. Lee, P. Kapoor, B.M. Tebo, and D.E. Giammar (2013) Uraninite oxidation and dissolution induced by manganese oxide: A redox reaction between two insoluble minerals, Geochim. Cosmochim. Acta 100: 24-40. DOI: 10.1016/j.gca.2012.09.053.
  6. Wang, Z., S.-W. Lee, J.G. Catalano, J.S. Lezama-Pacheco, J.R. Bargar, B.M. Tebo, and D.E. Giammar (2013) Adsorption of uranium(VI) to manganese oxides: X-ray absorption spectroscopy and surface complexation modeling, Environ. Sci. & Technol. 47(2): 850-858.  DOI: 10.1021/es304454g.
  7. Wang, Z. and D.E. Giammar (2013) Mass action expressions for bidentate adsorption in surface complexation modeling: Theory and practice, Environ. Sci. & Technol., 47(9): 3982–3996. DOI: 10.1021/es305180e.
  8. Williams, K.H., J.R. Bargar, J.R. Lloyd, and D.R. Lovley (2013) Bioremediation of uranium-contaminated groundwater: a systems approach to subsurface biogeochemistry. Current Opinion in Biotechnology 24(3): 489-497, DOI: 497   DOI: 10.1016/j.copbio.2012.10.008.
  9. Orellana, R., J.J. Leavitt, L.R. Comolli, R. Csencsits, N. Janot, K.A. Flanagan, A.S. Gray, C. Leang, M. Izallalen, T. Mester and D.R. Lovley (2013) U(VI) reduction by a diversity of outer surface c-type cytochromes of Geobacter sulfurreducens, Appl. Environ. Microbiol., 76(12): 3999-4007.  DOI: 10.1128/AEM.00027-10. 
  10. Maher, K., J.R. Bargar, and G.E. Brown, Jr. (2013) Environmental speciation of actinides. Inorg. Chem., 52(7): 3510-3532. DOI: 10.1021/ic301686d.
  11. Cismasu, A.C., C. Levard, F.M. Michel, and G.E. Brown, Jr. (2013) Properties of impurity-bearing ferrihydrite II: Insights into the surface structure and composition of pure, Al- and Si-bearing ferrihydrite from Zn(II) sorption experiments and Zn K-edge X-ray absorption spectroscopy. Geochim. Cosmochim. Acta 119: 46-60: DOI: 10.1016/j.gca2013.05.040.

Calendar Year 2012:

  1. Giammar, D.E., J.M. Cerrato, V. Mehta, Z. Wang, Y. Wang, T.J. Pepping, K.-U. Ulrich, J.S. Lezama-Pacheco, and J.R. Bargar (2012) Effect of diffusive transport limitations on UO2 dissolution, Water Research 46(18): 6023-6032. DOI: 10.1016/j.watres.2012.08.034.
  2. Cismasu, A.C., F.M. Michel, J.F. Stebbins, C.M. Levard, and G.E. Brown, Jr. (2012) Properties of impurity-bearing ferrihydrite I. Effects of Al content and precipitation rate on the structure of 2-line ferrihydrite, Geochim. Cosmochim. Acta 92: 275-291. DOI: 10.1016/j.gca.2012.06.010.
  3. Alessi, D. S., B. Uster, H. Veeramani, E.I. Suvorova, J.S. Lezama-Pacheco, J.E. Stubbs, J.R. Bargar and R. Bernier-Latmani (2012) Quantitative separation of monomeric U(IV) from UO2 in products of U(VI) reduction, Environ. Sci. Technol. 46(11): 6150-6157. DOI: 10.1021/es204123z
  4. Barrón, V., J. Torrent, and F.M. Michel (2012) Critical evaluation of the revised akdalaite model for ferrihydrite – Discussion, Amer. Mineral, 97(1): 253-254. DOI: 10.2138/am.2012.3894
  5. Cerrato, J.M., C.J. Barrows, L.Y. Blue, J.S. Lezama-Pacheco, J.R. Bargar, and D.E. Giammar (2012) Effect of Ca2+ and Zn2+ on UO2 dissolution rates, Environ. Sci. Technol., 46(5): 2731-2737. DOI: 10.1021/es203751t
  6. Toner, B.M., T.S. Berquó, F.M. Michel, J.V. Sorensen, A.S. Templeton, and K.J. Edwards (2012) Mineralogy of iron microbial mats from Loihi Seamount, Front. Microbiol., 3: 1-18. DOI: 10.3389/fmicb.2012.00118
  7. Ma, R., C.M. Levard, S. Marinakos, S.Y. Chen, J. Liu, F.M. Michel, G.E. Brown, Jr., and G.V. Lowry (2012) Size-controlled dissolution of organic-coated silver nanoparticles, Environ. Sci. Technol. 46(2):752-759. DOI: 10.1021/es201686j
  8. Singh, A., J.G. Catalano, K.-U. Ulrich, and D.E. Giammar (2012) Molecular-scale structure of uranium(VI) immobilized with goethite and phosphate, Environ. Sci. Technol. 46(12): 6604-6611. DOI: 10.1021/es300494x
  9. Campbell, K.M., H. Veeramani, K.-U. Ulrich, L.Y. Blue, D.E. Giammar, R. Bernier-Latmani, J.E. Stubbs, E.I. Suvorova, S.B. Yabusaki, J.S. Lezama-Pacheco, A. Mehta, P.E. Long, and J.R. Bargar (2011) Oxidative dissolution of biogenic uraninite in groundwater at Old Rifle, CO. Envir. Sci. Technol. 45(20): 8748-8754. DOI: 10.1021/es200482f
  10. Campbell, K.M., R.K. Kukkadapu, N.P.  Qafoku, A.D. Peacock, E. Lesher, K.H. Williams, J.R. Bargar, M.J. Wilkins, L. Figueroa, J. Ranville, J.A. Davis, and P.E. Long (2012) Geochemical, mineralogical and microbiological characteristics of sediment from a naturally reduced zone in a uranium-contaminated aquifer. Appl. Geochem., 27(8): 1499-1511. DOI: 10.1016/j.apgeochem.2012.04.013.
  11. Handley, K.M., K.C. Wrighton, Y.M. Piceno, G.L. Andersen, T.Z. DeSantis, K.H. Williams, M.J. Wilkins, A.L. N'Guessan, A.D. Peacock, J.R. Bargar, P.E. Long, and J.F. Banfield (2012) High-density PhyloChip profiling of stimulated aquifer microbial communities reveals a complex response to acetate amendment. FEMS Microbiol. Ecol., 81(1): 188-204. DOI: 10.1111/j.1574-6941.2012.01363.x

Calendar Year 2011:

  1. Harrington, R., D.B. Hausner, W. Xu, N. Bhandari, F.M. Michel, G.E. Brown, Jr., D.R. Strongin, and J.B. Parise, (2011) Neutron pair distribution function study of two-line ferrihydrite, Environ. Sci. Technol., 45(23): 9883-9890. DOI: 10.1021/es2020633
  2. Levard, C.M., F.M. Michel, Y. Wang, Y. Choi, P. Eng, and G.E. Brown, Jr. (2011) Probing Ag nanoparticle surface oxidation in contact with (in)organics: an X-ray scattering and fluorescence yield approach, J Synchrotron. Radiat., 18:871-878. DOI: 10.1107/S090904951103843X
  3. Sharp, J.O., J.S. Lezama-Pacheco, E.J. Schofield, P. Junier, K.-U. Ulrich, S. Chinni, H. Veeramani, C. Margot-Roquier, S.M. Webb, B.M. Tebo, D.E. Giammar, J.R. Bargar, and R. Bernier-Latmani (2011) Uranium speciation and stability after reductive immobilization in aquifer sediments. Geochim. Cosmochim. Acta, 75(21): 6497-6510. DOI: 10.1016/j.gca.2011.08.022
  4. Levard, C.M., B.C. Reinsch, F.M. Michel, C. Oumahi, G.V. Lowry, G.E. Brown, Jr. (2011) Sulfidation processes of PVP-coated silver nanoparticles in aqueous solution: Impact on dissolution rate, Environ. Sci. Technol., 45(12): 5260-5266. DOI: 10.1021/es2007758
  5. Ulrich, K.-U., H. Veeramani, R. Bernier-Latmani, and D.E. Giammar (2011) Speciation-dependent kinetics of uranium(VI) bioreduction. Geomicrobio. J., 28(5-6): 396-409. DOI: 10.1080/01490451.2010.507640
  6. Campbell, K.M., J.A. Davis, J.R., Bargar, D.E. Giammar, R. Kukkadapu, K.H. Williams, H. Veeramani, K.-U. Ulrich, J.E. Stubbs, S.B. Yabusaki, L. Figueroa, F. Lesher, M.J. Wilkins, A. Peakcock, and P.E. Long (2011) Composition, stability, and measurement of reduced uranium phases for groundwater bioremediation at Old Rifle, CO. Appl. Geochemistry, 26(S): S167-S169. DOI: 10.1016/j.apgeochem.2011.03.094
  7. Veeramani, H., D.S. Alessi, E.I. Suvorova, J.S. Lezama-Pacheco, J.E. Stubbs, J.O. Sharp, U. Dippon, A. Kappler, J.R. Bargar, and R. Bernier-Latmani (2011) Products of abiotic U(VI) reduction by biogenic magnetite and vivianite. Geochim. Cosmochim. Acta, 75(9): 2512-2528. DOI: 10.1016/j.gca.2011.02.024
  8. Ray, A.E., J.R. Bargar, V. Sivaswamy, A.C. Dohnalkovae, U. Fujita, B.M. Peyton, and T.S. Magnuson. (2011) Evidence for multiple modes of uranium immobilization by an anaerobic bacterium. Geochim. Cosmochim. Acta 75(10): 2648-2695. DOI: 10.1016/j.gca.2011.02.040
  9. Cismasu, A.C., F.M. Michel, P.A. Tcaciuc, T. Tyliszczak, and G.E. Brown, Jr., (2011) Composition and structural aspects of naturally-occurring ferrihydrite. C. R. Geosci., 343(2-3): 210-218. DOI: 10.1016/j.crte.2010.11.001
  10. Xin, D., B. Boonchayaanant, W.-M. Wu, S. Fendorf, J.R. Bargar, and C.S. Criddle (2011) Reduction of uranium(VI) by soluble iron(II) conforms with thermodynamic predictions. Environ. Sci. Technol., 45(11): 4718-4725. DOI: 10.1021/es2006012.

Calendar Year 2010:

  1. Dalla Vecchia, E., H. Veeramani, E.I. Suvorova, N.S. Wigginton, J.R. Bargar and R. Bernier-Latmani. (2010) U(VI) reduction by spores of Clostridium acetobutylicum. Res. Microbiol., 161(9): 765-771. DOI: 10.1016/j.resmic.2010.08.001
  2. Bernier-Latmani, R., H. Veeramani, E. Dalla Vecchia, P. Junier, J.S. Lezama-Pacheco, E.I. Suvorova, J.O. Sharp, J.E. Stubbs, N.S. Wigginton, and J.R. Bargar (2010) Non-uraninite products of microbial U(VI) reduction. Environ. Sci. Technol., 44(24): 9456-9462. DOI: 10.1021/es101675a
  3. Ilton, E.S., J.-F. Boily, E.C. Buck, F.N. Skomurski, K.M. Rosso, C.L. Cahill, J.R. Bargar, and A.R. Felmy (2010) Influence of Dynamical Conditions on the Reduction of U-VI at the Magnetite-Solution Interface. Environ. Sci. Technol., 44(1): 170-176. DOI: 10.1021/es9014597
  4. Michel, F.M., V. Barrón, J. Torrent, M.P. Morales, C.J. Serna, J.-F. Boily, Q.S. Liu, A. Ambrosini, A.C. Cismasu, and G.E. Brown, Jr. (2010) Ordered ferrimagnetic form of ferrihydrite reveals links among structure and magnetism. P. Natl. Acad. Sci. U.S.A., 107(7): 2787-2792. DOI: 10.1073/pnas.0910170107
  5. Singh, A., K.-U. Ulrich, and D.E. Giammar (2010) Impact of phosphate on U(VI) immobilization in the presence of goethite, Geochim. Cosmochim. Acta, 74(22): 6324-6343. DOI: 10.1016/j.gca.2010.08.031

Calendar Year 2009:

  1. Sharp, J.O., E.J. Schofield, H. Veeramani, E.I. Suvorova, D.W. Kennedy, M.J. Marshall, A. Mehta, J.R. Bargar, and R. Bernier-Latmani (2009) Structural similarities between biogenic uraninites produced by phylogenetically and metabolically diverse bacteria, Environ. Sci. Technol. 43(21): 8295-8301. DOI: 10.1021/es901281e
  2. Ulrich, K.-U., E.S. Ilton, H. Veeramani, J.O. Sharp, R. Bernier-Latmani, E.J. Schofield, J.R. Bargar., S.D. Conradson, and D.E. Giammar (2009) Comparative dissolution kinetics of biogenic and chemogenic uraninite under oxidizing conditions in the presence of carbonate. Geochim. Cosmochim. Acta 73(20): 6065–6083. DOI: 10.1016/j.gca.2009.07.012
  3. Veeramani, H., E.J. Schofield, J.O. Sharp, E.I. Suvorova, K.-U. Ulrich, A. Mehta, D.E. Giammar, J.R. Bargar, and R. Bernier-Latmani (2009) Effect of Mn(II) on the structure and reactivity of biogenic uraninite. Environ. Sci. Technol. 43(17): 6541–6547. DOI: 10.1021/es900556k
  4. Zeng, H., A. Singh, S. Basak, K.-U. Ulrich, M. Sahu, P. Biswas, J.G. Catalano, and D.E. Giammar (2009) Nanoscale size effects on uranium(VI) adsorption to hematite. Environ. Sci. Technol. 43(5): 1373-1378. DOI: 10.1021/es802334e
  5. Hiemstra, T., W.H. Van Riemsdijk, A. Rossberg, and K.-U. Ulrich (2009) A surface structural model for ferrihydrite. II. Adsorption of uranyl and carbonate. Geochim. Cosmochim. Acta. 73(15): 4437-4451. DOI: 10.1016/j.gca.2009.04.035
  6. Junier, P., J. Frutschi, N.S. Wiggington, E.J. Schofield, J.R. Bargar, and R. Bernier-Latmani (2009) Metal reduction by spores of Desulfotomaculum reducens. Environ. Microbiol. 11(12): 3007-3017.  DOI: 10.1111/j.1462-2920.2009.02003.x
  7. Rossberg, A., K.-U. Ulrich, S. Weiss, S. Tsushima, T. Hiemstra, and A.C. Scheinost. (2009) Identification of uranyl surface complexes on ferrihydrite: Advanced EXAFS data analysis and CD-MUSIC modeling. Environ. Sci. Technol. 43(5): 1400-1406. DOI: 10.1021/es801727w

Calendar Year 2008:

  1. Bargar, J.R., R. Bernier-Latmani, D.E. Giammar, and B.M. Tebo (2008) Biogenic uraninite nanoparticles and their importance for uranium remediation. Elements, 4(6): 407-412. DOI: 10.2113/gselements.4.6.407
  2. Schofield, E.J., H. Veeramani, J.O. Sharp, E.I. Suvorova, R. Bernier-Latmani, A. Mehta, J. Stahlman, S.M. Webb, D.L. Clark, S.D. Conradson, and J.R. Bargar (2008) Structure of biogenic uraninite produced by Shewanella Oneidensis, strain MR-1. Environ. Sci. Technol. 42(21): 7898-7904. DOI: 10.1021/es800579g
  3. Ulrich, K.-U., D.E. Giammar, S. Dixon, A. Singh, E.J. Schofield, J.R. Bargar, H. Veeramani, J.O. Sharp, and R. Bernier-Latmani (2008) Dissolution of biogenic and synthetic UO2 under varied reducing conditions. Environ. Sci. Technol. 42(15): 5600-5606. DOI: 10.1021/es800647u
  4. Schofield, E.J., B. Ingham, A. Turnbull, M.F. Toney, and M.P. Ryan (2008) Strain development in nanoporous metallic foils formed by dealloying. Appl. Phys. Lett. 92(4): 043118. DOI: 10.1063/1.2838351
  5. Chinni, S., C.R. Anderson, K.-U. Ulrich, D.E. Giammar, and B.M. Tebo (2008) Indirect UO2 oxidation by Mn(II)-oxidizing spores of Bacillus sp. strain SG-1 and the effect of U and Mn concentrations. Environ. Sci. Technol. 42(23): 8709-8714. DOI: 10.1021/es801388p

 

Presentations at National and International Scientific Meetings - wholly or partly supported by this program. 

Calendar Year 2013 Presentations

  1. Jones, M.E., N. Janot, J.R. Bargar, and S. Fendorf. “Porosity and Organic Carbon Controls on Naturally Reduced Zone (NRZ) Formation Creating Microbial ‘Hotspots’ for Fe, S, and U Cycling in Subsurface Sediments”. Presented at the American Geophysical Union 2013 Fall Meeting, symposium H41H. Overcoming Remediation Barriers and Improving the Understanding of Processes Controlling Contaminant Transport III, San Francisco, CA, December 12, 2013. [poster]
  2. Dublet, G., G.E. Brown, J. Bargar, S.E. Fendrof, and N. Janot. “Effect of Humic Substances on the Trapping and Transformations of U(VI) by Ferrihydrite”. Presented at the American Geophysical Union 2013 Fall Meeting, symposium B31C. Soil Change and Soil Organic Matter Dynamics in the Anthropocene IV, San Francisco, CA, December 11, 2013. [poster]
  3. Herndon, E., T.R. Chowdhury, B.F. Mann, D.E. Graham, J. Bargar, B. Gu, and L. Liang. “Chemical and spectroscopic analyses of organic matter transformation in warming tundra soils”. Presented at the American Geophysical Union 2013 Fall Meeting, symposium B23I. Soil Change and Soil Organic Matter Dynamics in the Anthropocene II, San Francisco, CA, December 10, 2013. [oral]
  4. Bargar, J.R. “The “Undercover” Life of Uranium in Aquifers; Why it Matters to Energy and the Environment”. Presented at the Lockheed Martin Palo Alto Colloquium, Palo Alto, CA, October 17, 2013. [Invited]
  5. Bargar, J.R. “X-ray absorption spectroscopy investigations of biogeochemical dynamics of uranium, sulfur, and iron in reduced sediments”. Presented at the International Association of Hydrologists Symposium on Determining the Hydrogeochemistry, Transport and Fate of Uranium in the Context of Environmental Outcomes, Perth, Australia, Sept 21-22, 2013. [Invited]
  6. Stylo, M., D.S. Alessi, P.P. Shao, J. Lezama-Pacheco, J.R. Bargar, J.R., and R. Bernier-Latmani, “Biogeochemical Controls on the Product of Microbial U(VI) Reduction”. Presented at the 2014 Goldschmidt Conference, Symposium 10f: Microbe/Mineral Interfaces and their Role in Biomineralization Processes, Florence, Italy, August 26, 2013. [oral]
  7. Bernier-Latmani, R., P.P. Shao, L.R. Comolli, M. Stylo, D.S. Alessi, and J.R. Bargar. “Microbial Extracellular Polymeric Substances Modulate the Product of Uranium Biomineralization”. Presented at the 2014 Goldschmidt Conference, Symposium 10f: Microbe/Mineral Interfaces and their Role in Biomineralization Processes, Florence, Italy, August 26, 2013. [oral]
  8. Alessi, D., N. Janot, J. Lezama-Pacheco, E. Suvorova, J. Cerrato, D.E. Giammar, P. Fox, K.H. Williams, P.E. Long, K. Handley, K. Wrighton, C. Miller, L. Yang, R. Bernier-Latmani, and J.R. Bargar. “Speciation of Uranium Products Formed during in situ Biostimulation of the Old Rifle, CO Aquifer”. Presented at the 2014 Goldschmidt Conference, Symposium 18d: Trace element dynamics in mining impacted environments and integrated remediation solutions, Florence, Italy, August 27, 2013. [oral]
  9. Janot, N., J. Lezama-Pacheco, D. Alessi, R. Bernier-Latmani, E. Suvorova, J. Cerrato, D. Giammar, L. Yang, J. Davis, P. Fox, K. Williams, P. Long, K. Handley, and J.R. Bargar. “Fe and S Redox Cycling during a Biostimulation Episode at the Old Rifle, CO Aquifer”. Presented at the 2014 Goldschmidt Conference, Florence, Italy, August 28, 2013. [oral]
  10. Jones, M.E., N. Janot, J.R. Bargar, and S. Fendorf. “Effects of Sediment Porosity and Particulate Organic Carbon on Fe, S and U Cycling in Naturally Reduced Zones (NRZs) of a Contaminated Aquifer”. Presented at the 2014 Goldschmidt Conference, Florence, Italy, August 26, 2013. [oral]
  11. Stubbs, J., P. Eng, C. Biwer, A. Chaka, G. Waychunas, and J. Bargar. “Oxidative Corrosion of Uraninite (UO2) Surfaces”.  Presented at the 2014 Goldschmidt Conference, Symposium 10a: Geochemical Processes at Mineral-Water Interfaces: Insight from Macroscopic, Spectroscopic, and Computational Methods, Florence, Italy, August 27, 2013. [oral]
  12. Bargar, J.R. “Progress in understanding uranium redox transitions in reduced sediments”. Presented at the Department of Energy, Office of Legacy Management, Grand Junction, CO, Aug 7, 2013.  [Invited]
  13. Bernier-Latmani, R., Shao, P.P., Comolli, L.R., Bargar, J.R., Alessi, D.S. and M. Stylo. “Microbial uranium reduction: a tale of two products”. Swiss Society for Microbiology meeting, Interlaken, Switzerland, June 26, 2013. [Invited]
  14. Brown, G.E., Jr., J.R. Bargar, K. Maher, S. Fendorf, G. Dublet, N. Janot, M. Massey, J.S. Lezama-Pacheco, and D.L. Clark. “Environmental Geochemistry of the Light Actinides”. Presented at the Institut de Minéralogie et de Physique des Milieux Condensés (IMPMC), Université Paris VI, Paris, France, June 24, 2013.  [Invited]
  15. Bargar, J.R.. “Progress in understanding uranium redox transitions in reduced sediments”. Presented at the Max IV/BECC Workshop on Synchrotron Radiation in Environmental and Soil Science, Lund, Sweden, May 30, 2013. [Invited]
  16. Bernier-Latmani, R, Alessi, D.S., Shao, P.P., Stylo, M., Suvorova, E.I., Bargar, J.R., and Lezama-Pacheco, J.S. “The remediation of aquifer U(VI) contamination using microorganisms”. Presented at the E-MRS 2013 Spring meeting, Symposium 13 E: Scientific basis of the nuclear fuel cycle Strasbourg, May 27, 2013.  [Invited]
  17. Giammar, D.E.. “Biogeochemical processes influence the mobility of uranium in the environment.” Presented at the Department of Environmental Sciences, Rutgers University, New Brunswick, NJ, May 22, 2013. [Invited]
  18. Bargar, J.R., R. Bernier-Latmani, D.E. Giammar, P.E. Long, and K.H. Williams. “Synchrotron and biogeochemical techniques to understand biogeochemical critical element cycling at molecular to pore scales”. Presented at the 2013 TES/SBR Investigators Meeting, Session on Investigating Biogeochemical Processes Using Advanced Technologies, Potomac, MD, May 15, 2013. [Invited]
  19. Fendorf, S. "Deciphering Molecular-Scale Processes to Describe Field-Scale Phenomena in Carbon and Metal Cycling". Presented at the 2013 TES/SBR Investigators Meeting, Plenary Session, Potomac, MD, May 14, 2013. [Invited]
  20. Bernier-Latmani, R., D.S. Alessi, P.P. Shao, M. Stylo, E.I. Suvorova, D.E. Giammar, José M. Cerrato, Matthew N. Ashner, J.R. Bargar, J.S. Lezama-Pacheco, N. Janot, K.H. Williams, P.E. Long, L.R. Comolli, and K. Handley. “SLAC SFA: Molecular-scale biogeochemical controls over uranium, sulfur, and iron redox cycling in the subsurface”. Presented at the 2013 TES/SBR Investigators Meeting, Potomac, MD, May 14-15, 2013. [poster]
  21. Jones, M.E., J.S. Lezama-Pacheco, S.E. Fendorf, G.E. Brown Jr., P.E. Long, K.H. Williams, N. Janot, D. Nordlund, D.Q. Pham, T. O’Brien, J.R. Bargar, and P. Persson. SLAC-SFA: “Biogeochemical controls over C, S, Fe and U redox cycling in NOM-rich aquifer sediments”. Presented at the 2013 TES/SBR Investigators Meeting, Potomac, MD, May 14-15, 2013. [poster]
  22. Bargar, J.R.. “Uranium redox processes in biologically reduced sediments”. Presented at the Canadian Light Source 2013 Annual Users Meeting, Workshop on Green Mining: Synchrotron Approaches and Applications, Saskatoon, SK, Canada, May 2, 2013. [Invited]
  23. Brown, G.E., Jr., K. Maher, K.D. Bird, N.C. Johnson, B. Thomas, R.J. Rosenhauer, T. Kendelewicz, S., Yamamoto, J.T. Newberg, S. Kaya, H. Bluhm, A. Nilsson, Y. Wang, J.R. Bargar, A. Jew, A.C. Cismasu, F.M. Michel, C. Levard, P.J. Eng, Y. Choi, and A.M. Spormann. “Mineral-aqueous solution interfacial processes and their impact on the environment". Presented at the 2013 Gordon Research Conference on Chemical Reactions on Surfaces. Les Diablerets, Switzerland, May 2, 2013. [Invited]
  24. Bargar, J.R. “Uranium redox processes in biologically reduced sediments”. Presented at the SLAC Photon Sciences Seminar, Menlo Park, CA, April 24, 2013. [Invited]
  25. Bargar, J.R. “The “Undercover” Life of Uranium in Aquifers; Why it Matters to Energy and the Environment”. Presented at the SLAC Colloquium, Menlo Park, CA, April 15, 2013. [Invited]
  26. N. Janot, J.S. Lezama-Pacheco, D.Q. Pham, D. Hausladen, M.E. Jones, S.E. Fendorf, J.M. Cerrato, D.E. Giammar, K.H. Williams, P.E. Long, C. Cismasu, P.S. Nico, G.E. Brown, Jr., and J.R. Bargar. “Biogeochemical cycling of organic carbon, uranium, and sulfur in an alluvial aquifer”. Presented at the 245th ACS National Meeting, Symposium on Carbon Dynamics and the Biogeochemical Cycling of Major and Minor Elements, New Orleans, Louisiana, April 10, 2013. [poster]
  27. N. Janot, J.S. Lezama-Pacheco, S.M. Dunham-Cheatham, D.Q. Pham, K.H. Williams, P.E. Long, D.S. Alessi, R. Bernier-Latmani, L. Yang, J.A. Davis, J.M. Cerrato, D.E. Giammar, and J.R. Bargar. “Biogeochemical cycling of uranium in a reduced aquifer”. Presented at the 245th ACS National Meeting, Symposium on Redox Processes at Mineral-Water Interfaces and their Impacts on Metal Biogeochemical Cycling and Contaminant Remediation, New Orleans, Louisiana, April 9, 2013. [oral]
  28. Wang, Z., S.-W. Lee, W. Wu, B.M. Tebo, and D.E. Giammar. “Different effects of Mn(II) on UO2 dissolution kinetics under reducing and oxidizing conditions”.  Presented at the 245th ACS National Meeting, Symposium on Redox Processes at Mineral-Water Interfaces and their Impacts on Metal Biogeochemical Cycling and Contaminant Remediation, New Orleans, Louisiana, April 9, 2013. [oral]
  29. Cerrato, J.M., M.N. Ashner, D.S. Alessi, J.S. Lezama-Pacheco, R. Bernier-Latmani, J.R. Bargar, and D.E. Giammar. “Reactivity of U(IV) species under different chemical conditions.” Presented at the 245th ACS National Meeting, Symposium on Redox Processes at Mineral-Water Interfaces and their Impacts on Metal Biogeochemical Cycling and Contaminant Remediation, New Orleans, Louisiana, April 7, 2013. [oral]
  30. Giammar, D.E.. “Biogeochemical processes controlling the mobility of uranium in contaminated subsurface environments”. Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, March 28, 2013 [Invited].
  31. Brown, G.E., Jr.. “Characterization of NOM and It’s Interactions with Metal Ions and Mineral Surfaces”. Presented at the Workshop on Belowground Carbon Cycling Processes at the Molecular Scale, Environmental Molecular Science Laboratory, Pacific Northwest National Lab, Richland, WA, February 2013. [Invited]

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FY 2012 [Oct 1, 2011 – Sept 30, 2012]:

  1. Bargar, J.R., K.H. Williams, K.M. Campbell, J.E. Stubbs, E.I. Suvorova, J.S. Lezama-Pacheco, D.S. Alessi, M. Stylo, K.M. Handley, S.M. Webb, R. Bernier-Latmani, J.M. Cerrato, J.A. Davis, P.E. Fox, and P.E. Long. “Progress in understanding Uranium(VI) reduction mechanisms in natural aquifers”. Presented at Duke University, Center for Environmental Implications for Nanotechnology, Durham, NC. September 11, 2012.  [Invited]
  2. Bargar, J.R., J.S. Lezama-Pacheco, N. Janot, J.E. Stubbs, K.H. Williams, P.E. Long, E.I. Suvorova, M.A. Stylo, D.S. Alessi, R. Bernier-Latmani, K.M. Campbell, J.A. Davis, P.M. Fox, J.M. Cerrato, and D.E. Giammar. “Uranium(VI) reduction products in the Old Rifle, CO alluvial aquifer: Insights from X-ray absorption spectroscopy”. Presented at the 244th ACS National Meeting, Symposium on Spectroscopic Identification of Interfacial Chemical Species in Natural and Engineered Environments, Philadelphia, PA, Aug 22, 2013. [Invited]
  3. Pham, D., J.R. Bargar, and N. Janot. “Determining the elemental composition of naturally reduced sediments at Old Rifle aquifer”. Presented at the STEM Teacher and Researcher Conference, Mountain View, CA, August 11, 2012. [poster]
  4. Wang, Z., S.-W. Lee, B.M. Tebo, and D.E. Giammar. “Oxidative dissolution of uraninite in the presence of manganese oxide.” Presented at the 2012 Goldschmidt Conference, Symposium Inorganic Redox Processes at Mineral Surfaces and Nanoparticles, Montreal, Canada, June 24-29, 2012. [oral]  
  5. Alessi, D.S., M. Stylo, J.S. Lezama-Pacheco, J.E. Stubbs, S. Dunham-Cheatham, J.R. Bargar, P.E. Long, and R. Bernier-Latmani. “Stability and transformation of monomeric U(IV) species at the Rifle, Colorado IFRC field site”. Presented at 2012 Goldschmidt Geochemistry Conference, Symposium on Uranium: from a Durable Resource to its Environmental Impact. Montreal, Canada, June 24-29, 2012. [oral]
  6. Stylo, M., D.S. Alessi, J.S. Lezama-Pacheco, J.R. Bargar, and R. Bernier-Latmani. “Modulation of the product of U(VI) reduction by phosphate and calcium”. Presented at 2012 Goldschmidt Geochemistry Conference, Symposium on Microbial Transformations of Radionuclides. Montreal, Canada, June 24-29, 2012. [oral]
  7. Fendorf, S. “The impact of on mineral surfaces on metal-contaminant redox cycles”.  Geochemical Society’s 22nd V. M. Goldschmidt Conference.  Montreal, Canada. June 24-29, 2012. [Invited]
  8. Fendorf, S. 2012.  “The Dynamic Nature of Iron Oxides on Modes of Ion Retention”.  Geochemical Society’s  22nd V. M. Goldschmidt Conference.  Montreal, Canada. June 24-29, 2012. [Invited]
  9. Janot, N., J.R. Bargar, J.S. Lezama-Pacheco, J.E. Stubbs, K.H. Williams, P.E. Long, E. Suvorova, M. Stylo, D.S. Alessi, R. Bernier-Latmani, K. Campbell, J.A. Davis, P. Fox, J.M. Cerrato, and D.E. Giammar. “Speciation of Uranium(IV) in a bioreduced aquifer”. Presented at the 2012 Interfaces Against Pollution International Conference, Symposium on Synchrotron source as a tool in environmental science, Nancy, France, June 11, 2012. [oral]
  10. Bargar, J.R. R. Bernier-Latmani, G.E. Brown Jr., S.E. Fendorf, and D.E. Giammar. “SLAC SFA Project Overview: Biogeochemical Processes Governing the Speciation, Dynamics, and Stability of Uranium in Reduced Aquifers”. Presented at the 2012 SBR Investigators Meeting, Washington, DC, April 30 – May 2, 2012. [poster]
  11. Bargar, J.R., J.S. Lezama Pacheco, N. Janot, J.E. Stubbs, D.S. Alessi, E.I. Suvorova, G.M. Stylo, R. Bernier-Latmani, K.H. Williams, P.E. Long, J.A. Davis, P.M. Fox, K.M. Handley, J.M. Cerrato, and D. E. Giammar. “SLAC SFA: Speciation of Uranium in Biologically Reduced Sediments During Iron and Sulfate Reduction in the Old Rifle Aquifer”. Presented at the 2012 SBR Investigators Meeting, Washington, DC, April 30 – May 2, 2012. [poster]
  12. Bernier-Latmani, R., D.S. Alessi, P.P. Shao, M. Stylo, J.S. Lezama-Pacheco, N. Janot, J.R. Bargar, P. E. Long, and L.R. Comolli. “SLAC SFA: U(IV) Biomineralization and Stability of Monomeric U(IV) Species”. Presented at the 2012 SBR Investigators Meeting, Washington, DC, April 30 – May 2, 2012. [poster]
  13. D.E. Giammar, J.M. Cerrato, M.N. Ashner, Z. Wang, V. Mehta, J. S. Lezama-Pacheco, J.R. Bargar, D. S. Alessi, and R. Bernier-Latmani. “SLAC SFA: Biogeochemical Processes and Diffusive Transport Limitations Affecting the Stability of Biogenic U(IV)”. Presented at the 2012 SBR Investigators Meeting, Washington, DC, April 30 – May 2, 2012. [poster]
  14. Michel, F.M., J.S. Lezama-Pacheco, J.R. Bargar, A.C. Cismasu, G.E. Brown, Jr., K.H. Williams, and P.E. Long. “SLAC-SFA: Structural Basis for Ferrihydrite Reactivity in Subsurface Environments”. Presented at the 2012 SBR Investigators Meeting, Washington, DC, April 30 – May 2, 2012. [poster]
  15. Bernier-Latmani R., Alessi, D.S., Stylo, M., Lezama-Pacheco, J.S., Bargar, J.R. “X-rays shine light on environmental clean-up: using synchrotron techniques for bioremediation”. Presented at the International Workshop on the Management of Radioactive Waste: from Transmutation to Bioremediation, Roma, Italy April 23, 2012. [Invited]
  16. Giammar, D.E. “Influence of Aqueous Geochemistry on the Oxidative Dissolution of Uraninite”. Presented at the International Workshop on Uranium Biogeochemistry: Transformations and Applications in Monte Verita, Ascona, Switzerland, March 11-16, 2012. [Invited]
  17. Bargar, J.R., K.J. Williams, K.M. Campbell, J.E. Stubbs, E. Suvorova, J.S. Lezama-Pacheco, D.S. Alessi, D., M. Stylo, M., K.M. Handley, R. Bernier-Latmani, J.M. Cerrato, D.E. Giammar, J.A. Davis, P.M. Fox, and P.E. Long. “Progress in understanding uranium (IV) speciation and dynamics in biologically reduced aquifer sediments at Old Rifle, CO”. Presented by Rizlan Bernier-Latmani on behalf of John Bargar at the International Workshop on Uranium Biogeochemistry: Transformations and Applications in Monte Verita, Ascona, Switzerland, March 11-16, 2012. [Invited]
  18. Alessi, D.S., Lezama-Pacheco, J.S., Stubbs, J.E., Janousch, M., Persson, P., Bargar, J.R., and R. Bernier-Latmani. “Determination of U(IV) biomass complexes using X-ray absorption and infrared spectroscopy”. Presented at the International Workshop on Uranium Biogeochemistry: Transformations and Applications in Monte Verita, Ascona, Switzerland, March 11-16, 2012. [Invited]
  19. Bernier-Latmani, R., Alessi, D.S., Shao, P.P., Stylo, M., Lezama-Pacheco, J.S., Persson, P., Bargar, J.R. “Formation, structure and stability of monomeric U(IV), a product of microbial U(VI) reduction”. Presented at the 243rd National meeting of the American Chemical Society, Symposium on Redox Transformations of Metals in Sediments at Molecular and Pore Scales, in San Diego, March, 25-29 2012. [Invited]
  20. Bargar, J.R., K.J. Williams, K.M. Campbell, J.E. Stubbs, E. Suvorova, J.S. Lezama-Pacheco, D.S. Alessi, D., M. Stylo, M., K.M. Handley, R. Bernier-Latmani, J.M. Cerrato, D.E. Giammar, J.A. Davis, P.M. Fox, and P.E. Long. “Progress in understanding uranium(IV) speciation and dynamics in biologically reduced sediments: Research at molecular to centimeter scales by the SLAC SFA program”. Presented at the American Geophysical Union, Fall Meeting 2011, Symposium H23I, Bioreductive Immobilization and Remediation of Metals and Radionuclides: Mechanisms, Models, and Sustainability II, San Francisco, December 6, 2011 [Invited]
  21. Bargar, J.R., K.J. Williams, K.M. Campbell, J.E. Stubbs, E. Suvorova, J.S. Lezama-Pacheco, D.S. Alessi, D., M. Stylo, M., K.M. Handley, R. Bernier-Latmani, J.M. Cerrato, D.E. Giammar, J.A. Davis, P.M. Fox, and P.E. Long. “Progress in understanding U(IV) products of biological uranium reduction in the Old Rifle, CO aquifer”. Presented at the American Geophysical Union, Fall Meeting 2011, Symposium B34H, Microbe-Mineral Interactions in Modern and Ancient Environments I. San Francisco, December 8, 2011 [Invited]
  22. Lezama-Pacheco, J. S, J.R. Bargar, J.E. Stubbs, R. Bernier-Latmani, E. Suvorova, K.H. Williams, J.A. Davis, P.M. Fox, D.E. Giammar, J.M. Cerrato, and P.E. Long. “Speciation of uranium in biologically reduced sediments during iron and sulfate reduction in the Old Rifle Aquifer” Presented at the American Geophysical Union, Fall Meeting 2011, Symposium V22B, Radionuclides in the Environment I, San Francisco, December 6, 2011. [oral]
  23. Lezama-Pacheco, J. S, J.R. Bargar, J.E. Stubbs, R. Bernier-Latmani, E. Suvorova, K.H. Williams, J.A. Davis, P.M. Fox, D.E. Giammar, J.M. Cerrato, and P.E. Long. “Spectroscopic insights on U(VI) species in biologically reduced sediments at the Old Rifle aquifer”. Presented at the 2011 GSA Annual Meeting, Session on 88. Symposium on Uranium in Groundwater: Biogeochemical Controls on Mobility and Persistence, Minneapolis, MN, Oct. 10, 2011 [Invited]

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FY 2011:

  1. Ulrich, K.-U., H. Veeramani, E.J. Schofield, J.O. Sharp, E.I. Suvorova, J.E. Stubbs, J.S. Lezama-Pacheco, C.J. Barrows, J.M. Cerrato, K.M. Campbell, S.B. Yabusaki, P.E. Long, R. Bernier-Latmani, D.E. Giammar, and J.R. Bargar. “Biostimulated Uranium Immobilization within Aquifers – From Bench Scaled to Field Experiments”. Presented at International Mine Water Congress, Aachen, Germany, Sept. 4-11, 2011.  [Oral]
  2. Bargar, J.R., K.M. Campbell, J.E. Stubbs, E.I. Suvorova, K.H. Williams, J.S. Lezama-Pacheco, L.Y. Blue, J.M. Cerrato, R. Bernier-Latmani, D.E. Giammar, and P.E. Long. “Speciation and Dynamics of Biologically Reduced Uranium(IV) in the Old Rifle Aquifer.” Presented at the 242nd ACS National Meeting, Symposium on Uptake and Incorporation of Radionuclides in Minerals, Denver, CO, Aug. 28-Sept. 1, 2011.  [Invited]
  3. Cerrato, J.M., D.E. Giammar, C. Barrows, J.R. Bargar, and J.S. Lezama-Pacheco. “Impact of Adsorption Reactions on Mobilization of Uranium from UO2 in Groundwater.” Presented at the 242nd ACS National Meeting, Symposium on Uptake and Incorporation of Radionuclides in Minerals, Denver, CO, Aug. 28-Sept. 1, 2011.  [Oral]
  4. Lezama-Pacheco, J.S., M.S. Massey, F.M. Michel, J.R. Bargar, and S.E. Fendorf. “Mechanism of Uranium Incorporation in Iron Oxides During Catalytic Transformation by Fe(II).” Presented at the 242nd ACS National Meeting, Symposium on Uptake and Incorporation of Radionuclides in Minerals, Denver, CO, Aug. 28-Sept. 1, 2011.  [Oral]
  5. Michel, F.M., Y. Wang, C. Levard, J.R. Bargar, Y. Choi, P.J. Eng, and G.E. Brown, Jr. “From Single Crystals to Nanoparticles: Probing Reactive Interfaces Using the Long-Period X-ray Standing Wave Approach.” Presented at the 242nd ACS National Meeting, Symposium on Reactive Properties of Environmental Interfaces, Denver, CO, Aug. 28-Sept. 1, 2011.  [Invited]
  6. Stubbs, J.E., P.J. Eng, G.A. Waychunas, and J.R. Bargar. “Structure and Reactivity of the Uraninite (111) Surface.” Presented at the 242nd ACS National Meeting, Symposium on Reactive Properties of Environmental Interfaces, Denver, CO, Aug. 28-Sept. 1, 2011.  [Oral]
  7. Brown, G.E., Jr., G. Morin, G. Ona-Nguema, F. Juillot, Y. Wang, D. Fandeur, K. Benzerara, G. Calas, Y. Wang, J.-Y. Ha, S. Kaya, T. Kendelewicz, A.M. Spormann, and A. Nilsson. “Element Attachment and Electron Transfer Reactions at Mineral-Water and Mineral-Microbe Interfaces”. Presented at the Goldschmidt 2011 Conference, Prague, The Czech Republic, August 2011. [Keynote]
  8. Alessi D.S., J.S. Lezama-Pacheco, J.E. Stubbs, M. Janousch, P. Persson, J.R. Bargar, and R. Bernier-Latmani, “Spectroscopic Characterization of U(IV)-Biomass Complexes”. Presented at 2011 Goldschmidt Geochemistry Conference, Symposium on Biogeochemical Processes in Management and Forensics of Legacy Radioactive Materials, Prague, Czech Republic, Aug. 14-19, 2011. [Oral]
  9. Bernier-Latmani, R., D.S. Alessi, H. Veeramani, J.O. Sharp, E. Dalla Vecchia, E.I. Suvorova, J.E. Stubbs, J.S. Lezama-Pacheco, and J.R. Bargar. “Does the Electron Transfer Process Determine the Product of U(VI) Reduction?” Presented at 2011 Goldschmidt Geochemistry Conference, Symposium on Chemical and Microbial Electron Transfer Processes at Mineral Surfaces, Prague, Czech Republic, Aug. 14-19, 2011.  [Invited]
  10. Cismasu, A.C., F.M. Michel, J. Stebbins, C. Levard, and G.E. Brown, Jr., “Structural Aspects and Surface Reactivity of Aluminous Ferrihydrite Precipitates”. Presented at 2011 Goldschmidt Geochemistry Conference, Symposium on Natural, Synthetic, and Incidental Nanoparticles, Their Surface Characteristics, and Their Interactions with Earth and Life, Prague, Czech Republic, Aug. 14-19, 2011.  [Oral]
  11. Giammar D.E., J.M. Cerrato, C. Barrows, Z. Wang, V. Mehta, J.S. Lezama-Pacheco, and J.R. Bargar. “Impact of Groundwater Composition and Diffusive Transport Limitations on Uraninite Stability.” Presented at 2011 Goldschmidt Geochemistry Conference, Symposium on Understanding the Fate and Transformation of Metal and Radionuclide Contaminants in Unsaturated and Saturated Subsurface Environments, Prague, Czech Republic, Aug. 14-19, 2011.  [Oral]
  12. Lezama-Pacheco, J.S., M.S. Massey, J.R. Bargar, S.E. Fendorf, and F.M. Michel, “Structural Incorporation of Uranium During the Fe(II)-Induced Transformation of Ferrihydrite”. Presented at the 2011 Goldschmidt Geochemistry Conference, Symposium on Understanding the Fate and Transformations of Metal and Radionuclide Contaminants in Unsaturated and Saturated Subsurface Environments, Prague, Czech Republic, Aug. 14-19, 2011. [Oral]
  13. Michel, F.M., A.C. Cismasu, J.S. Lezama-Pacheco, M. Massey, S.E. Fendorf, G.E. Brown, Jr., and J.R. Bargar. “Natural Ferrihydrite: Impact of Structure and Composition on Redox Cycling.” Presented at 2011 Goldschmidt Geochemistry Conference, Symposium on Chemical and Microbial Electron Transfer Processes at Mineral Surfaces, Prague, Czech Republic, Aug. 14-19, 2011.  [Invited]
  14. Plathe, K., S.-W. Lee, J.S. Lezama-Pacheco, B. Tebo, J.R. Bargar, and R. Bernier-Latmani. Fate of U(IV) during Microbially-Driven Mn(II) Oxidation in Sediments.” Presented at 2011 Goldschmidt Geochemistry Conference, Symposium on Understanding the Fate and Transformation of Metal and Radionuclide Contaminants in Unsaturated and Saturated Subsurface Environments, Prague, Czech Republic, Aug. 14-17, 2011.  [Oral]
  15. Shao, P., D.S. Alessi, M. Stylo, J.R. Bargar, and R. Bernier-Latmani. “Nanoscale Study of Exopolymeric Substance-Mediated Uranium Biomineralization.” Presented at 2011 Goldschmidt Geochemistry Conference, Symposium on Advanced Microanalytical, Spectroscopic, and (Spectro-)Microscopic Surface Methods: STXM, NEXAFS, AFM, NANOSIMS, …, Prague, Czech Republic, Aug. 17, 2011.  [Oral]
  16. Stylo, M., D.S. Alessi, B. Uster, J.S. Lezama-Pacheco, J.R. Bargar, and R. Bernier-Latmani. “Geochemical and Biological Controls on the Product of Microbial U(VI) Reduction.” Presented at 2011 Goldschmidt Geochemistry Conference, Symposium on Microbial Catalysis of Mineral Dissolution and Precipitation, Prague, Czech Republic, Aug. 17, 2011.  [Oral]
  17. Toner, B.M., L. Briscoe, F.M. Michel, S. Alexander, C. Alexander, and J. Gralnick. “Iron Microbial Mat Formation from Deep Continental Brines”. Presented at 2011 Goldschmidt Geochemistry Conference, Symposium on Biogeochemical Cycling of Iron, Prague, Czech Republic, Aug. 14-19, 2011.  [Invited]
  18. Bargar, J.R., R. Bernier-Latmani, D.E. Giammar, G.E. Brown, Jr., and S.E. Fendorf.  “Progress in understanding uranium speciation and dynamics in reduced sediments: Research at molecular to centimeter scales by the SLAC SFA program”. Presented at the 2011 SBR PI meeting, Washington, D.C., April 27, 2011.  [Invited]
  19. Lezama-Pacheco, J.S., M.S. Massey, J.R. Bargar, S.E. Fendorf, and F.M. Michel, “Structural Mechanisms of Uranium Incorporation in Iron Oxides”. Presented at the 241st ACS National Meeting, Symposium on Geochemical Implications in Toxic Trace Metal Remobilization from Sediments to the Surrounding Aqueous Environment, Anaheim, CA, Mar. 30, 2011. [Oral]
  20. Brown, G.E., Jr., S. Yamamoto, T. Kendelewicz, J.T. Newberg, S. Kaya, H. Bluhm, M. Salmeron, A.  Nilsson, Y. Wang, F.M. Michel, C. Levard, P.J. Eng, Y. Choi, J.-Y. Ha, and A.M. Spormann. “Environmental Interfaces: Where the Vacuum, Cleanliness, and Size Gaps Must be Minimized”, Presented at the Surface Science Symposium on Environmental Interfaces, 57th Annual American Vacuum Society Meeting Albuquerque, NM, October 2010. [Invited]

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FY2010:

  1. Bargar, J.R., J.E. Stubbs, J.S. Lezama-Pacheco, K.H. Williams, K.M. Campbell, E.I. Suvorova, R. Bernier-Latmani, L.Y. Blue, and P.E. Long, “Whole-Sediment Speciation of U(IV) in Acetate-Bioreduced Aquifer Sediments at the Rifle IFRC Site”. Presented at the 2010 American Geophysical Union Conference, Symposium on Metal and Radionuclide Transformation and Remediation in Biogeochemically Dynamic Subsurface Environments III, San Francisco, CA, Dec. 17, 2010. [Oral]
  2. Bargar, J.R., K.M. Campbell, H. Veeramani, E.I. Suvorova, R. Bernier-Latmani, J.E. Stubbs, J.S. Lezama-Pacheco, K.-U. Ulrich, L.Y. Blue, D.E. Giammar, P.E. Long, and S.B. Yabusaki. “Stability of Biogeochemically Reduced Uranium Under in situ Conditions at the Old Rifle Site”. Presented at the 2010 Long-Term Surveillance and Monitoring Conference, Grand Junction, CO, Nov. 17, 2010. [Invited]
  3. Bernier-Latmani, R., H. Veeramani, E.J. Schofield, J.O. Sharp, D.S. Alessi, B. Uster, E.I. Suvorova, and J.R. Bargar. “Reduction of U(VI) by Microorganisms: Formation of Nanoparticulate Uraninite and Other Products”. Presented at 2010 Mineralogical Society of America Conference, Symposium on Structure, Properties, and Geochemistry of Nanoparticles, Nanoclusters, and Nanocomposites in Biogeochemical Systems: In honor of Benjamin Gilbert, Recipient of the 2010 MSA Award, Denver, CO, Oct. 30, 2010. [Invited]
  4. Michel, F.M., J.R. Bargar, and G.E. Brown, Jr. “Strain and Structural Disorder in Nanoparticles: Effects on Stability and Reactivity”. Presented at 2010 Mineralogical Society of America Conference, Symposium on Structure, Properties, and Geochemistry of Nanoparticles, Nanoclusters, and Nanocomposites in Biogeochemical Systems: In honor of Benjamin Gilbert, Recipient of the 2010 MSA Award, Denver, CO, Oct. 30, 2010. [Invited]
  5. Bargar, J.R., K.M. Campbell, H. Veeramani, E.I. Suvorova, R. Bernier-Latmani, J.E. Stubbs, J.S. Lezama-Pacheco, K.-U. Ulrich, L.Y. Blue, D.E. Giammar, P.E. Long, and S.B. Yabusaki. “Reactivity and Structural Chemistry of Biogenic Uraninite Nanoparticles in Geochemical Matrices”. Presented at 2010 Mineralogical Society of America Conference, Symposium on Structure, Properties, and Geochemistry of Nanoparticles, Nanoclusters, and Nanocomposites in Biogeochemical Systems: In honor of Benjamin Gilbert, Recipient of the 2010 MSA Award, Denver, CO, Oct. 30, 2010. [Invited]
  6. Alessi, D.S., B. Uster, H. Veeramani, J.E. Stubbs, J.S. Lezama-Pacheco, J.R. Bargar, and R. Bernier-Latmani, “Method to Estimate the Contribution of Molecular U(IV) to the Product of U(VI) Reduction”. Presented at the 2010 Goldschmidt Conference, Symposium on Transformation of Radionuclides by Microorganisms and Minerals, Knoxville, TN, Jun. 15, 2010. [Oral]
  7. Bargar, J. R., K.M. Campbell, K.-U. Ulrich, H. Veeramani, D.E. Giammar, R. Bernier-Latmani, and P.E. Long. “Corrosion of Biogenic Uraninite: Molecular and Intermediate-Scale Measurements”. Presented at the 2009 Meeting of The Geological Society of America, Symposium on Frontiers in Mineral Sciences: Mineral/Melt Energetics, Mineral Surface Chemistry, Mineral Nanosciences, and High-Pressure Mineralogy II, Portland, OR, Oct. 18, 2009. [Invited].
  8. Bargar, J.R., K.M. Campbell, H. Veeramani, J.E. Stubbs, J.S. Lezama-Pacheco, E.I. Suvorova, K.-U. Ulrich, L.Y. Blue, R. Bernier-Latmani, D.E. Giammar, S.B. Yabusaki, and P.E. Long, “Reactivity of Nano-Biogenic Uraninite in the Subsurface: Dissolution Rates and Mechanisms”. Presented at the 2010 Goldschmidt Conference, Symposium on Nanogeology: How nanoparticle structure and composition lead to unique function and reactivity, Knoxville, TN, Jun. 16, 2010. [Invited]
  9. Bargar, J.R., K.M. Campbell, H. Veeramani, K.-U. Ulrich, P.E. Long, K.H. Williams, R. Bernier-Latmani, and D.E. Giammar “Mechanisms of Biogenic Uraninite Corrosion in Groundwater at the Rifle IFRC Site”. Presented at the 2009 American Geophysical Union Conference, Symposium on Sustained Metal and Radionuclide Attenuation in Complex, Evolving Subsurface Environments II, San Francisco, CA, Dec. 16, 2009. [Oral]
  10. Bargar, J.R., K.M. Campbell, J.E. Stubbs, J.S. Lezama-Pacheco, K.H. Williams, P.E. Long, R. Bernier-Latmani, L.Y. Blue, and D.E. Giammar, “In-situ Measurement of Acetate-Bioreduced Uranium Products at the Rifle IFRC Field Site”. Presented at S.M. Stoller Corp., Grand Junction, CO, Sept. 22, 2010. [Oral]
  11. Bargar, J.R., R. Bernier-Latmani, H. Veeramani, J.O. Sharp, K.M. Campbell, L.Y. Blue, D.E. Giammar, E.J. Schofield, J.E. Stubbs, J.S. Lezama-Pacheco, P.E. Long, and K.H. Williams, “Biogenic Nano-UO2: Impact of Structure and Composition on Reactivity in the Environment”. Presented at the Colorado School of Mines, Department of Environmental Science and Engineering, Golden, CO, Apr. 16, 2010. [Invited]
  12. Bernier-Latmani, R., “Synchrotron-Based Characterization of the Product of Microbial U(VI) Reduction”. Presented at the 22nd Annual Meeting of MAX-lab, Symposium on XAFS Spectroscopy at MAX IV, Lund, Sweden, Nov. 4, 2009. [Invited]
  13. Bernier-Latmani, R., D.S. Alessi, B. Uster, E. Dalla Vecchia, E.I. Suvorova, J.S. Lezama-Pacheco, J.R. Bargar, and P. Persson, “Microbially-Mediated Uranium Reduction: Role of Solutes and Biomolecules in Product Formation”. Presented at the 20th General meeting of the international mineralogical association in Budapest, Hungary, Aug. 21-27th, 2010. [Oral]
  14. Bernier-Latmani, R., E. Dalla Vecchia, P. Junier, Lezama, J., H. Veeramani, E.I. Suvorova, J.R. Bargar, D.S. Alessi, Sharp, J.S., N.S. Wigginton, and J.E. Stubbs, “Non-Uraninite Products for Microbial U(VI) Reduction”. Presented at the 2010 Goldschmidt Conference, Symposium on Chemical and Biological Processes at Mineral Surfaces: Influence on Contaminant Dynamics, Knoxville, TN, Jun. 18, 2010. [Invited]
  15. Bernier-Latmani, R., H.J. Veeramani, P. Junier, E. Dalla Vecchia, J.O. Sharp, E.I. Suvorova, J.R. Bargar, J.S. Lezama-Pacheco, J.E. Stubbs, and N.S. Wigginton, “Complexed U(IV) is a Product of Microbial U(VI) Reduction”. Presented at the 239th National Meeting of the American Chemical Society, Symposium on Spectroscopic Investigations of Metal Interactions at Mineral/Water/Microbial Interfaces, San Francisco, CA, Mar. 24, 2010. [Invited]
  16. Campbell, K.M., J.R. Bargar, H. Veeramani, R. Bernier-Latmani, D.E. Giammar L.Y. Blue, K.H. Williams, and J.A. Davis, “Reactivity and Stability of U(IV) Phases at Rifle, CO”. Presented at the 2009 American Geophysical Union Conference, Symposium on Fate and Transport of Radionuclides in the Environment II, San Francisco, CA, Dec. 16, 2009. [Invited]
  17. Ding, M., P. Longmire, D. Vaniman, D. Broxton, M. Rearick, B.N. Spall, S.D. Ware, D. Katzman, J.R. Bargar, and S.M. Webb, “Experimental Characterization of Chromium Fate and Transport in the Vadose Zone and Regional Aquifer at Sandia Canyon, Los Alamos, New Mexico”. Presented at the 2009 Meeting of The Geological Society of America, Symposium Contaminant Hydrogeology: Contaminant Fate and Transport in Geological Systems, Portland, OR, Oct. 21, 2009. [Poster]
  18. Ding, M., P. Longmire, D. Vaniman, D. Broxton, M. Rearick, S.D. Ware, D. Katzman, J.R. Bargar, and S.M. Webb, “Experimental Characterization of Chromium Fate and Transport in the Vadose Zone and Regional Aquifer at Sandia Canyon, Los Alamos, New Mexico”. Presented at the 2009 American Geophysical Union Conference, Symposium on Sustained Metal and Radionuclide Attenuation in Complex, Evolving Subsurface Environments II, San Francisco, CA, Dec. 16, 2009. [Oral]
  19. Lezama, J.L., M.S. Massey, F.M. Michel, J.R. Bargar, G.E. Brown, Jr., S.E. Fendorf, and P.S. Nico, “Structural Mechanisms of Uranium Incorporation in Iron Oxides”. Presented at the 239th National Meeting of the American Chemical Society, Symposium on Spectroscopic Investigations of Metal Interactions at Mineral/Water/Microbial Interfaces, San Francisco, CA, Mar. 24, 2010. [Poster]
  20. Michel, F.M., “Iron Oxide Structures and Reactivity”. Presented at the Biogeochemical Processes of the Iron Cycle: From Microbes to Minerals, Telluride, Co, Jul. 28-31, 2010. [Invited]
  21. Michel, F.M., J.S. Lezama-Pacheco, M.S. Massey, G.E. Brown, Jr., S.E. Fendorf, and J.R. Bargar, “Structural Basis of Uranium Incorporation in Natural Iron (Oxyhydr)oxides”. Presented at the 2009 Annual SSRL/LCLS Users Meeting, Menlo Park, CA, Oct. 19, 2009. [Poster]
  22. Michel, F.M., M.S. Massey, J.S. Lezama-Pacheco, G.E. Brown, Jr., S.E. Fendorf, and J.R. Bargar “Structural Basis of Uranium Incorporation in Natural Iron (Oxyhydr)oxides”. Presented at the 2009 American Geophysical Union Conference, Symposium on Fate of Nanoparticles and Colloids in the Environment III, San Francisco, CA, Dec. 17, 2009. [Poster]
  23. Michel, F.M., V. Barrón, and G.E. Brown, Jr., “Total X-ray Scattering Reveals Lattice Strain in Ferrihydrite and Clues to Surface Structure”. Presented at the 2010 Goldschmidt Conference, Symposium on Pushing Experimental and Computational Limits: A Perspective Look at Mineral-Fluid Interfaces, Knoxville, TN, Jun. 18, 2010. [Invited Keynote]
  24. Michel, F.M., V. Barrón, J. Torrent, M.P. Morales, C.J. Serna, J.-F. Boily, L. Qingsong, A. Ambrosini, A.C. Cismasu, and G.E. Brown, Jr., “Ferrimagnetic Form of Ferrihydrite Reveals Links Among Structure, Composition, and Magnetism”. Presented at the 239th National Meeting of the American Chemical Society, Symposium on Spectroscopic Investigations of Metal Interactions at Mineral/Water/Microbial Interfaces, San Francisco, CA, Mar. 24, 2010. [Invited]
  25. Michel, F.M., V. Barrón, J. Torrent, M.P. Morales, C.J. Serna, J.-F. Boily, O.S. Liu, A. Ambrosini, A.C. Cismasu, and G.E. Brown, Jr., “Ordered Ferrimagnetic Form of Ferrihydrite Reveals Links Among Structure, Composition, and Magnetism”. Presented at the 2009 Meeting of The Geological Society of America, Symposium on Frontiers in Mineral Sciences: Mineral/Melt Energetics, Mineral Surface Chemistry, Mineral Nanosciences, and High-Pressure Mineralogy III, Portland, OR, Oct. 19, 2009. [Oral]
  26. Stubbs, J.E., P.J. Eng, G.A. Waychunas, M. Paffett, and J.R. Bargar, “Structure of Hydrated UO2 Surfaces”. Presented at the 2010 Goldschmidt Conference, Symposium on In situ Observations of Fluid-Mineral Interfacial Structure, Dynamics and Reactivity, Knoxville, TN, Jun. 14, 2010. [Poster]
  27. Veeramani, H., D.S. Alessi, E.I. Suvorova, J.S. Lezama-Pacheco, J.E. Stubbs, U. Dippon, A. Kappler, J.R. Bargar, and R. Bernier-Latmani, “Products of Abiotic U(VI) Reduction by Biogenic Magnetite and Vivianite”. Presented at the 2010 Goldschmidt Conference, Symposium on Microbial Redox Transformations of Metal(loid)s and their Implication for Bioremediation, Knoxville, TN, Jun. 17, 2010. [Oral]
  28. Wang, Y., F.M. Michel, C. Yong, P.J. Eng, J.R. Bargar, B. Gu, and G.E. Brown, Jr., “Metal Ion Partitioning and Speciation at Complex Natural Organic Matter-Mineral Interfaces”. Presented at the 239th National Meeting of the American Chemical Society, Symposium on the Influence of Natural Organic Matter on the Fate and Transport of Metals, Colloids and Nanoparticles in the Aquatic Systems, San Francisco, CA, Mar. 24, 2010. [Oral]

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FY2009:

  1. Bargar, J.R. R. Bernier-Latmani, D.E. Giammar, K.M. Campbell, and P.E. Long, “Biogeochemical Factors Governing the Speciation and Reactivity of Reduced Uranium: Implications for Bioremediation and Natural Attenuation”. Presented at the Pacific Northwest National Laboratory, Richland, WA, Sept. 18, 2009. [Invited]
  2. Bargar, J.R., E.J. Schofield, H. Veeramani, K.-U. Ulrich, J.O. Sharp, R. Bernier-Latmani, D.E. Giammar, K.M. Campbell, A. Mehta, M. Marshall, and E.S. Ilton, “Structure, Composition, Size, and Reactivity of Biogenic Nano-Uraninite”. Presented at the Seaborg Institute for Transactinium Science Institute at LBNL, Berkeley, CA, May 27, 2009 [Invited]
  3. Bargar, J.R., E.J. Schofield, H. Veeramani, K.-U. Ulrich, Sharp, J., R. Bernier-Latmani, D.E. Giammar, K.M. Campbell, A. Mehta, M. Marshall, and E.S. Ilton, “Structure, Composition, Size, and Reactivity of Environmental Nano-Uraninite”. Presented at the EuCheMS ICCE Conference, Stockholm, Sweden, Jun. 17, 2009. [Keynote].
  4. Bargar, J.R., R. Bernier-Latmani, D.E. Giammar, A. Mehta, E.J. Schofield, J.O. Sharp, E.I. Suvorova, K.-U. Ulrich, and H. Veeramani, “Structure, Composition, Size and Reactivity of Biogenic Nano-Uraninite”. Presented at the 2009 Goldschmidt Geochemistry Conference, Symposium on Synchrotron and Neutron Advances in Environmental Geochemistry and Mineralogy. Davos, Switzerland, Jun. 21-26, 2009. [Keynote]
  5. Bargar, J.R., R. Bernier-Latmani, D.E. Giammar, E.J. Schofield, H. Veeramani, K.-U. Ulrich, J.O. Sharp, S.D. Conradson, A. Mehta, and D.L. Clark, “Fundamental Structural/Compositional and Solute Controls Governing Biogenic Uraninite Stability in Ground Water”. Presented at the DOE-ERSP 4th Annual PI Meeting 2009, Lansdowne, VA, Apr. 23, 2009. [Invited]
  6. Bernier-Latmani, R. and P. Junier, “Metal Reduction in Metal- vs. Sulfate-Reducing Bacteria: Insights from Genomics and Transcriptomics”. Presented at the 2009 Goldschmidt Geochemistry Conference, Symposium on the Genomics of Geochemistry. Davos, Switzerland, Jun. 21-26, 2009. [Invited]
  7. Bernier-Latmani, R., J.O. Sharp, H. Veeramani, E.I. Suvorova, J.R. Bargar, A. Mehta, Ulrich, K.-U., D.E. Giammar “How Do Biogeochemical Conditions Affect the Product of U(VI) Reduction by Bacteria?” Presented at the 237th ACS National Meeting, Symposium on Metal and Metalloid Speciation and Adsorption in Honor of James O. Leckie, Salt Lake City, UT, Mar. 24, 2009. [Oral]
  8. Bernier-Latmani, R., P. Junier, J.O. Sharp, E.J. Schofield, and J.R. Bargar, “Reduction of U(VI) by Spores of Desulfotomaculum reducens”. 109th ASM meeting in Philadelphia May 17-21, 2009. [Poster]
  9. Bernier-Latmani, R., P. Junier, N.S. Wigginton, H. Veeramani, E. Dalla Vecchia, J.O. Sharp, E.J. Schofield, J.R. Bargar, “Reduction of U(VI) by Spores of Desulfotomaculum reducens”. 68th Swiss Society for Microbiology annual meeting in Lausanne, Jun. 4-5, 2009. [Invited]
  10. Giammar, D.E., K.-U. Ulrich, E.S. Ilton, H. Veeramani, J.O. Sharp, R. Bernier-Latmani, E.J. Schofield, and J.R. Bargar, “Geochemical Factors Controlling the Equilibrium Solubility and Dissolution Rate of Biogenic Uraninite”. Presented at Migration '09: 12th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, Kennewick, Washington, Sept. 20-25, 2009. [Oral]
  11. Junier, P., M. Frutschi, N.S. Wigginton, E. Dalla Vecchia, J.O. Sharp, E.I. Suvorova, E.J. Schofield, J.R. Bargar, and R. Bernier-Latmani, “U(VI) Reduction by Desulfotomaculum reducens”. Presented at the 2009 Goldschmidt Geochemistry Conference, Symposium on Synchrotron and Neutron Advances in Environmental Geochemistry and Mineralogy. Davos, Switzerland, Jun. 21-26, 2009. [Oral]
  12. Michel, F.M., A.C. Cismasu, D.R. Strongin, J.B. Parise, and G.E. Brown, Jr. “Real-Space Structural Analysis of Ferrihydrite Nanoparticles”. Presented at the 237th ACS National Meeting, Symposium on Metal and Metalloid Speciation and Adsorption in Honor of James O. Leckie, Salt Lake City, UT, Mar. 24, 2009. [Invited]
  13. Michel, F.M., A.C. Cismasu, J.B. Parise, and G.E. Brown, Jr., “Evaluating the Structure of Poorly-Crystalline Iron Oxyhydroxides”. Presented at the 2008 Goldschmidt Geochemistry Conference, Symposium on Molecular-Scale Chemical and Biogeochemical Processes Affecting the Mobility of Metal and Radionuclide Contaminants in the Subsurface: Structures of Nanostructured Minerals and Minerals with Incorporation of Dopants. Vancouver, Canada, Jul. 13-18, 2008. [Invited]
  14. Schofield, E., J.R. Bargar, H. Veeramani, J.O. Sharp, R. Bernier-Latmani, E.I. Survova, D.E. Giammar, K.-U. Ulrich, A. Mehta, S.M. Webb, D.L. Clark, S.D. Conradson, and E.S. Ilton “Molecular- and Nano-Scale Structure and Reactivity of Biogenic Uranium(IV) Oxide”. Presented at the 2008 Fall Conference of the American Geophysical Union, Session on Nature and Role of Colloids and Nanoparticles in the Environment I, San Francisco, CA, Dec. 16, 2008. [Oral]
  15. Schofield, E.J., J.R. Bargar, S.M. Webb, A. Mehta, R. Bernier-Latmani, J.O. Sharp, H. Veeramani, S.D. Conradson, D.L. Clark, K.-U. Ulrich, D.E. Giammar, and E.S. Ilton. “Molecular and Nano-Scale Structure and Reactivity of Biogenic Uranium(IV) Oxide”. Presented at the 2008 SSRL/LCLS Users Meeting Workshop on Advanced Topics in EXAFS Analysis and Applications, Menlo Park, CA, Oct. 15, 2008. [Invited]
  16. Schofield, E.J., J.R. Bargar, S.M. Webb, A. Mehta, R. Bernier-Latmani, J.O. Sharp, H. Veeramani, S.D. Conradson, D.L. Clark, K.-U. Ulrich, D.E. Giammar, and E.S. Ilton. “Molecular and Nano-Scale Structure and Reactivity of Biogenic Uranium(IV) Oxide”. Presented at the 2008 SSRL/LCLS Users Meeting, Menlo Park, CA, Oct. 15, 2008. [Poster]
  17. Ulrich, K.-U., E.S. Ilton, H. Veeramani, J.O. Sharp, R. Bernier-Latmani, E.J. Schofield, J.R. Bargar, and D.E. Giammar “Speciation and Reactivity of Biogenic UO2 in Water”. Presented at the 237th ACS National Meeting, Symposium on Metal and Metalloid Speciation and Adsorption in Honor of James O. Leckie, Salt Lake City, UT, Mar. 24, 2009. [Oral]
  18. Veeramani, H., J.O. Sharp, E.I. Suvorova, E.J. Schofield, K.-U. Ulrich, A. Mehta, D.E. Giammar, J.R. Bargar, and R. Bernier-Latmani, “Manganese Incorporation Into Biogenic Uraninite and Affects Its Oxidative Stability”. Presented at the 2009 Goldschmidt Geochemistry Conference, Symposium on Geomicrobiological Processes Controlling Bioremediation, Natural Attenuation and Trace Gas Emissions. Davos, Switzerland, Jun. 21-26, 2009. [Oral]

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