Abstract
Bioactuators, biological motors in living systems are promising for integration and functionalization of microsystems. We have developed a Ca2+-driven microvalve powered by a contractile fiber, a stalk of Vorticella. Cells of Vorticella convallaria were trapped in designed microchambers. Stalks were self-grown in the chambers and their reversible linear actuations were controlled by regulating the concentration of Ca2+. A cell body, connected to a stalk, opened and closed a microchannel by the contraction and extension of the stalk. A flow field in the chamber was characterized to further optimize the actuation performance.
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