The hardware-based Anti-Brownian ELectrokinetic trap (ABEL trap) features a feedback latency as short as 25 μs,
suitable for trapping single protein molecules in aqueous solution. The performance of the feedback control loop is
analyzed to extract estimates of the position variance for various controller designs. Preliminary data are presented in
which the trap is applied to the problem of determining the distribution of numbers of ATP bound for single chaperonin
multi-subunit enzymes.
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