Bacterial Spores Can Harvest Energy from Changes in Humidity

;20 Ozgur Sahin 2014
Image courtesy of Xi Chen and Ozgur Sahin, Columbia University.

Experiments show that bacterial spores respond strongly to changes in humidity by expanding and contracting, acting like a muscle that can push and pull other objects. Scientists have taken advantage of this ability of spores to build electrical generators that harvest energy from evaporating water.

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