The polishing pad is useful for polishing magnetic, optical and semiconductor substrates. The invention further relates to heterologous nucleic acid constructs, vectors, transformation methods, plant cells and plants comprising such RBDV-encoding nucleic acids and methods for inducing resistance to RBDV by transforming plants with a nucleic acid construct comprising RBDV protein or polypeptide-encoding nucleic acid sequences. A release mechanism can release the inside of the capping member to an atmosphere even when the capping member is in contact with the head member. Antenna channels share a receiver, rather than maintain a dedicated receiver for each antenna element, as in conventional systems.