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

Hakim Boukhalfa Mary, P. Neu Alvin Crumbliss

Chemistry department at Duke University, Durham NC 27708

关键词: By-Products;    Microorganisms;    Actinides;    Ground Water;    Bioremediation;   

DOI  :  10.2172/878161
RP-ID  :  DOE/ED/63321-1
RP-ID  :  FG02-02ER63321
RP-ID  :  878161

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.