The present disclosure relates to host cells containing a recombinant polynucleotide encoding a polypeptide where the polypeptide transports cellodextrin into the cell. The outlet end of the cylinder is open and closed by an evacuation valve. The power supply assembly is mounted in the enclosure body and is prevented from moving in a first direction, that is substantially perpendicular to the rear panel, and a second direction, that is substantially perpendicular to the side panel, and disposed between the bottom panel and the cover panel. A commutator manufactured according to the method and an electric motor incorporating the commutator are also disclosed. The action of the acoustic member is directly or indirectly coupled to the fluid in the mouth, producing a foam which couples shear forces between the acoustic action member and the teethgums to produce a desired cleaningtherapeutic effect.