Local Environmental Control Technique for Bacterial Flagellar Motor
Micro/nanorobots have attracted scientific attention to develop novel technologies such as drug delivery systems. Recently, microorganisms, especially flagellated bacteria, have been used as propulsion for microobjects. To enhance the controllability of bacteria-driven microrobots, it is needed to establish a method to control the bacterial driving force directly. In many cases, the bacterial movements are regulated by the environment. Therefore, local environmental control technique is desired for bacterial driving force control. In this chapter, we introduce a local environmental control technique based on nano/micro dual pipettes for bacterial flagellar motor control. We show transient-state control of Na+-driven flagellar motor rotational speed by switching local discharges between Na+-containing and -free solutions, and steady-state control by simultaneous local discharges of the solutions with controlling discharge velocities independently. We found that rotational torque generated by the flagellar motor could be controlled in 102 pN·nm orders using the local environmental control technique based on nano/micro dual pipettes.
KeywordsRotational Speed Free Solution Rotational Torque Flagellar Motor Flagellar Filament
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