The bacterial flagellar motor is a reversible rotary nano-machine, about 45 nm in diameter, embedded in the bacterial cell envelope. It is powered by the flux of H+ or Na+ ions across the cytoplasmic membrane driven by an electrochemical gradient, the proton-motive force or the sodium-motive force.

By: Tech Planet
Title: This MOTOR Lives INSIDE YOU!
Sourced From: www.youtube.com/watch?v=9qPJueHMVMQ

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