U.S. Department of Energy Office of Biological and Environmental Research

BER Research Highlights


Bacteria Produce Distinct Form of Reduced Uranium
Published: June 07, 2010
Posted: June 24, 2010

Some gram-negative microorganisms are known to reduce soluble uranium to insoluble uraninite [UO2(s)] forming the basis for in situ bioremediation or natural attenuation techniques for uranium in contaminated groundwater. But do all bacteria produce the same forms of reduced uranium? New results indicate that some gram-positive bacteria such as Desulfitobacteria, common to subsurface environments, also reduce soluble uranium but produce a mononuclear uranium species that differs from the commonly observed uraninite mineral form produced by gram-negative bacteria. Researchers from the Georgia Institute of Technology and Argonne National Laboratory working at the Advanced Photon Source (APS) show that Desulfitobacteria produce a form of reduced uranium that is likely coordinated with light atom shells such as C/N/O or S/P rather than the commonly observed uraninite mineral structure [UO2(s)]. The chemical identity of uranium species in subsurface environments is crucial to modeling the biogeochemical processes controlling contaminant transport at DOE sites. These results suggest that these alternate forms of reduced uranium also need to be characterized to be able to accurately predict uranium mobility/stability in reduced environments.

Reference: KE Fletcher, MI Boyanov, SH Thomas, Q. Wu, KM Kemner, FE Loeffler, (2010) Environ. Sci. Technol., 44(12): 4705-4709

Contact: Robert T. Anderson, SC 23.1, (301) 903-5549
Topic Areas:

  • Research Area: Subsurface Biogeochemical Research
  • Research Area: Microbes and Communities
  • Research Area: Structural Biology, Biomolecular Characterization and Imaging
  • Research Area: Structural Biology Infrastructure

Division: SC-23.1 Climate and Environmental Sciences Division, BER

 

BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

May 10, 2019
Quantifying Decision Uncertainty in Water Management via a Coupled Agent-Based Model
Considering risk perception can improve the representation of human decision-making processes in age [more...]

May 09, 2019
Projecting Global Urban Area Growth Through 2100 Based on Historical Time Series Data and Future Scenarios
Study provides country-specific urban area growth models and the first dataset on country-level urba [more...]

May 05, 2019
Calibrating Building Energy Demand Models to Refine Long-Term Energy Planning
A new, flexible calibration approach improved model accuracy in capturing year-to-year changes in bu [more...]

May 03, 2019
Calibration and Uncertainty Analysis of Demeter for Better Downscaling of Global Land Use and Land Cover Projections
Researchers improved the Demeter model’s performance by calibrating key parameters and establi [more...]

Apr 22, 2019
Representation of U.S. Warm Temperature Extremes in Global Climate Model Ensembles
Representation of warm temperature events varies considerably among global climate models, which has [more...]

List all highlights (possible long download time)