Before revision:  By utilizing an Anti-Brownian electrokinetic trap (ABEL trap), single-molecule F\"orster resonance energy transfer (smFRET) -based subunit rotation monitoring was prolonged from milliseconds to seconds . The extended observation times for single proteoliposomes in solution allowed to observe fluctuating rotation rates of individual enzymes and to map the broad distributions of ATP-dependent calatytic rates in FoF1-ATP synthase .
After revision:  By utilizing an Anti-Brownian electrokinetic trap (ABEL trap), single-molecule F\"orster resonance energy transfer (smFRET) -based subunit rotation monitoring was prolonged from milliseconds to seconds by utilizing an Anti-Brownian electrokinetic trap (ABEL trap). These extended observation times for single proteoliposomes in solution allowed to observe fluctuating rotation rates of individual enzymes and to map the broad distributions of ATP-dependent calatytic rates in FoF1-ATP synthase .