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Isolation, genotypic and phenotypic characterization of an aqueous bacterium,  Shewanella  sp RCRI7, from  Qurugöl  Lake in Iran and uranium removal from aqueous solutions using the isolate is described. Based on 16S rRNA gene sequence analysis and phylogenetic tree, strain RCRI7 T  falls into genus  Shewanella . Closely related type strains include  Shewanella  xiamenensis  S4 T  KJ542801,  Shewanella  profunda  DSM15900 T  FR733713,  Shewanella  putrefaciens  LMG 26268 T  X81623 and  Shewanella  oneidensis  MR-1 T  AE014299. Anaerobic incubation of the bacteria in the presence of U(VI) led to uranium removal from the solution and formation of a black precipitate. Analysis of the precipitate using UV-vis confirmed the reduction of U(VI) to U(IV). The effects of pH, temperature, U(VI) concentration and cell density on uranium removal were elucidated. The maximum uranium removal was 97%. As a conclusion, the findings revealed the ability of the local strain RCRI7 for U(VI) bioreduction as an effective bacterium for uranium immobilization.

Removal of U(VI) from aqueous solutions using Shewanella sp. RCRI7, isolated from Qurugöl Lake in Iran