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Title: Interaction of Actinide Species with Microorganisms & Microbial Chelators: Cellular Uptake, Toxicity, & Implications for Bioremediation of Soil & Ground Water.

Microorganisms influence the natural cycle of major elements, including C, N, P, S, and transition metals such as Mn and Fe. Bacterial processes can also influence the behavior of actinides in soil and ground water. While radionuclides have no known biological utility, they have the potential to interact with microorganisms and to interfere with processes involving other elements such as Fe and Mn. These interactions can transform radionuclides and affect their fate and transport. Organic acids, extruded by-products of cell metabolism, can solubilize radionuclides and facilitate their transport. The soluble complexes formed can be taken up by the cells and incorporated into biofilm structures. We have examined the interactions of Pu species with bacterial metabolites, studied Pu uptake by microorganisms and examined the toxicity of Pu and other toxic metals to environmentally relevant bacteria. We have also studied the speciation of Pu(IV) in the presence of natural and synthetic chelators.
Authors:
Publication Date:
OSTI Identifier:
878161
Report Number(s):
DOE/ED/63321-1
TRN: US200712%%281
DOE Contract Number:
FG02-02ER63321
Resource Type:
Technical Report
Research Org:
Chemistry department at Duke University, Durham NC 27708
Sponsoring Org:
USDOE - Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ACTINIDES; BACTERIA; BIOREMEDIATION; BY-PRODUCTS; GROUND WATER; METABOLISM; METABOLITES; MICROORGANISMS; ORGANIC ACIDS; RADIOISOTOPES; SOILS; TOXICITY; TRANSITION ELEMENTS; TRANSPORT Actinides, siderophores, chelators, Cellular metal Uptake, metal toxicity