New Scientist TV: 3D-printed cyborg muscle produces artificial heartbeat: ...the pump uses the gas released by live yeast to generate pressure and distend a membrane, turning it into an artificial muscle. A valve - activated by electricity produced by a microbial fuel cell - controls the movement of the membrane. It opens to release pressure when the muscle is fully expanded, allowing it to shrink back to its resting state again to begin another cycle.
Walters says that using yeast allows a lot of pressure to be generated quickly.
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