A method and apparatus for introducing a compressed gas into a pressure vessel, for instance, hydrogen into a vehicle fuel tank, in which hydrogen is compressed in an initial and final compressions stages which can be powered by a common source. The tuned circuit has a variable-capacitance element whose capacitance varies in response to a control voltage and a negative capacitance circuit whose impedance frequency characteristics have opposite characteristics to those of a normal capacitance, and which is connected to the variable-capacitance element. This bi-phase material may be extremely fluid, easily exiting a discharge port without regard to normal bulk dry particulate friction or angle of repose. An access request concentrator is created for each resource, through which the resource is accessed. Insertion of an additional ORF62 gene which is partially truncated with the ORF63 deletion inhibited establishment of latency and allowed normal growth of the virus.