Shewanella oneidensis is a microbe that can convert soluble uranium, a groundwater-contamination threat at nuclear waste sites, to solid uraninite that sticks to soil, preventing contamination from reaching streams. Now, scientists have discovered unaninite particles and the bacterial enzymes responsible for that chemical conversion enmeshed together in a carpet of slime outside the cell, according to a study in today's advance online edition of PLoS Biology.