期刊
GEOMICROBIOLOGY JOURNAL
卷 21, 期 2, 页码 113-121出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01490450490266361
关键词
Arthrobacter; bacteria; Deinococcus radiodurans; poly phosphate granules; resistance; toxicity; uranium; uranyl phosphates
Heterotrophic bacteria were isolated from an acidic uranium-contaminated site. Five isolates and one reference strain, Deinococcus radiodurans, were studied for uranium accumulation and resistance to uranium. Cells were incubated in a pH 4 solution containing 80 ppm of U(VI) in the form Of (UO2)(2+) for 1 hr. Three isolates closely related to high G+C gram-positive bacteria were resistant to (UO2)(2+). One of the high G+C Gram-positive isolates, closely related to Arthrobacter ilicis, accumulated uranium intracellularly as precipitates closely associated with polyphosphate granules. It is interpreted that sequestration of uranium into polyphosphate is a detoxitication mechanism. Deinococcus radiodurans, the most radiation resistant organism known, was vulnerable to chemical toxicity of (UO2,)(2+). D. radiodurans precipitated nanocrystals of a uranyl phosphate mineral extracellularly, probably as the result of phosphate release during cell lysis. It is possible that Arthrobacter spp. play important roles in natural attenuation and stimulated bioremediation of sites contaminated with radionuclides and toxic organic compounds.
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