A computer system is provided including a processor, a persistent storage device, and a main memory connected to the processor and the persistent storage device. The method comprises initiating a call between a sender and a recipient on a telephony network including generating a telephony request and disconnecting the call prior to completion of a connection. The harmonic signal generator may generate harmonic signal including at least one harmonic component within the receiver’s reception range. The design of the fuel cell provides a substantially more compact design by not requiring space to allow for the expansion and contraction of the electrodes within the fuel cell. According to one embodiment, the system stores and updates metadata, including a governance list, for each of the files and directories. The present invention provides a tip containing the solid phase capturing a nucleic acid characterized in that washing solution is fed into the tip unidirectionally from head to end.