Interesting. The fact that the bacteria reduce the solubility of uranium could definitely be useful in the sequestration of the radioactive element. It definitely could be applied to other radioactive elements, maybe even just by exposing the bacteria to them over time. There's a process called directed evolution, where an organism is exposed to a mutagen and the desired substrate. Over time the organism mutates at random, and eventually a colony is isolated that can act on the new substance. In this case it could polonium, plutonium etc.