Reduction of Uranium

...the reduction of uranium was done by quantifying the fraction of uranium in both the soluble and insoluble pools. 

• Uranium in the cultures spiked to 3 μM shifted from ~90% soluble at the T0 time point for all 3 concentrations to 70–97% insoluble by the end of the 24 day incubations (Fig 3). 
• A mass balance indicated that 93–102% of the added uranium could be accounted for in the soluble/insoluble pools. 
• Interestingly, the bacterium also reduced uranium as efficiently at 5 and 10 μM concentration (up to 97%-S2 Fig). 
• However, the percent of soluble uranium at the T0 sampling time point was 78% for the 5 μM and 18% for the 10 μM treatments. Presumably, the bacteria were stimulated by the prior exposure to uranium during transfer and began reducing the radionuclide before the T0 samples could be collected. link