Uranium Reduction by Shewanella oneidensis MR-1 as a Function of NaHCO3 Concentration: Surface Complexation Control of Reduction Kinetics

2014 ◽  
Vol 48 (7) ◽  
pp. 3768-3775 ◽  
Author(s):  
Ling Sheng ◽  
Jeremy B. Fein
Keyword(s):  
Surface Complexation ◽  
Shewanella Oneidensis ◽  
Reduction Kinetics ◽  
Uranium Reduction ◽  
Concentration Surface

Enzymatic reduction of U60 nanoclusters by Shewanella oneidensis MR-1

2018 ◽  
Vol 106 (1) ◽  
pp. 21-30 ◽  
Author(s):  
Qiang Yu ◽  
Jeremy B. Fein
Keyword(s):  
Solid Phase ◽  
Direct Reduction ◽  
Bacterial Species ◽  
Shewanella Oneidensis ◽  
Uranyl Acetate ◽  
Reduction Kinetics ◽  
Bacterial Cells ◽  
Enzymatic Reduction ◽  
Reduction Capacity

AbstractIn this study, a series of reduction experiments were conducted using a representative uranyl peroxide nanocluster, U60 (K16Li44[UO2(O2)OH]60) and a bacterial species,Shewanella oneidensis MR-1, that is capable of enzymatic U(VI) reduction. U60 was reduced byS. oneidensisin the absence of O2, but the reduction kinetics for U60 were significantly slower than was observed in this study for aqueous uranyl acetate, and were faster than was reported in previous studies for solid phase U(VI). Our results indicate that U60 aggregates bigger than 0.2 μm formed immediately upon mixing with the bacterial growth medium, and that these aggregates were gradually broken down during the process of reduction. Neither reduction nor dissolution of U60 was observed during 72 h of control experiments open to the atmosphere, indicating that the breakdown and dissolution of U60 aggregates is caused by the reduction of U60, and thatS. oneidensisis capable of direct reduction of the U(VI) within the U60 nanoclusters, likely due to the adsorption of U60 aggregates onto bacterial cells. This study is first to show the reduction capacity of bacteria for uranyl peroxide nanoclusters, and the results yield a better understanding of the long term fate of uranium in environmental systems in which uranyl peroxide nanoclusters are present.

Exemplar Abstract for Shewanella oneidensis Venkateswaran et al. 1999.

2003 ◽  
Author(s):  
Charles Thomas Parker ◽  
Dorothea Taylor ◽  
George M Garrity
Keyword(s):  
Shewanella Oneidensis

Effect of H2O Partial Pressure on Reduction Kinetics of Iron-Based Fischer-Tropsch Catalyst

2010 ◽  
Vol 31 (2) ◽  
pp. 205-212
Author(s):  
Hong WANG ◽  
Yong YANG ◽  
Baoshan WU ◽  
Jian XU ◽  
Hulin WANG ◽  
...  
Keyword(s):  
Partial Pressure ◽  
Reduction Kinetics ◽  
Fischer Tropsch ◽  
Iron Based ◽  
Kinetics Of

A ROLE OF PROTEINS OF THE OUTER MEMBRANE OF Shewanella oneidensis MR-1 BACTERIA IN FORMATION AND STABILIZATION OF SILVER SULFIDE NANOPARTICLES

2015 ◽  
pp. 41-48 ◽  
Author(s):  
T. A. Voeikova ◽  
A. S. Shebanova ◽  
Yu. D. Ivanov ◽  
A. L. Kaysheva ◽  
L. M. Novikova ◽  
...  
Keyword(s):  
Outer Membrane ◽  
Shewanella Oneidensis ◽  
Silver Sulfide ◽  
Silver Sulfide Nanoparticles
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