The contraption uses harmless soil bacterium Bacillus subtilis, which when nutrients are scarce, turns itself into a tough little spore capable of withstanding heat, desiccation, chemical assaults, radiation.
The spores respond to changes in humidity. When the air dries the bacterium shrivel up like grapes turning into raisins and when the air is moist they become plump again.
In the experiment, they slathered bacterial spores on one side of a sheet of rubber,a dn when the sheet dried it curled up. Raising the humidity caused the sheet to straighten out again.
The study has been published in journal Nature Nanotechnology. (ANI)
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