Apparatus and method for a continuous replenishing of the lift gas and maintaining the proper pressure and lift of a tethered medium altitude aerostat utilizing a novel feed tube running the entire length of the tether. Said vesicles contain a set of bioactive molecules which confer remarkable properties, such as antigen recognition, antigen presentation and other regulatory and effector functions. The light source and detector are both oriented longitudinally along the axis of the ellipse and the light source and detector are each located at the two focal points of the ellipse in order to optimize the light absorption reading. This powder may be prepared by simple dry-blending of the constituents. When a valid trigger event occurs, for instance, external or internal interrupts or reset activation, the processor then exits the sleep mode and starts instruction etching at the PC_INIT address. According to another aspect of the invention, a non-radiative dielectric waveguide comprises parallel planar conductors arranged at an interval of half or below of a high-frequency signal wavelength, and a dielectric strip interposed between the parallel planar conductors.