Effects of the anaerobic respiration of Shewanella oneidensis MR-1 on the stability of extracellular U(VI) nanofibers.

ABSTRACT: Uranium (VI) is considered to be one of the most widely dispersed and problematic environmental contaminants, due in large part to its high solubility and great mobility in natural aquatic systems. We previously reported that under anaerobic conditions, Shewanella oneidensis MR-1 grown in medium containing uranyl acetate rapidly accumulated long, extracellular, ultrafine U(VI) nanofibers composed of polycrystalline chains of discrete meta-schoepite (UO(3)·2H2O) nanocrystallites. Wild-type MR-1 finally transformed the uranium (VI) nanofibers to uranium (IV) nanoparticles via further reduction. In order to investigate the influence of the respiratory chain in the uranium transformation process, a series of mutant strains lacking a periplasmic cytochrome MtrA, outer membrane (OM) cytochrome M

SUBMITTER: Jiang S 

PROVIDER: S-EPMC4070970 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature