If dry bacteria spores of the genus Bacillus were boxers, commentators would say they punch above their weight.
When they dehydrate, the rod-shaped spores— dormant cells that help the microorganism survive tough environmental conditions and are naturally found in soil and vegetation—shrivel or curl like a leaf. Add some moisture and they straighten out again. Studies have shown that they can absorb water and expand with remarkable force. Now scientists say this phenomenon can be harnessed to use the microbes as a potential source of renewable energy or as muscles to make superstrong robots.
In research recently reported in the journal Nature Nanotechnology, a team detailed how they smeared spores on a flat piece of rubber and created a bacteria-powered generator.