A voltage regulator with adaptive Miller compensation includes a first amplifier and a second amplifier. The apparatus also provides a unitary power supplycontroller disposed within a unitary housing that is coupled only to the LED array and a power source in one embodiment. Given non-availability of the called wireless communication terminal equipment, the calls are rerouted to the communication network using the performance feature of \u201ccall deflection\u201d provided in the base station in the home area. The subject discs may be employed with separate vertebral body fixation elements, or they may include integrated vertebral body fixation elements. Methods of making and improving vaccines are also provided. The invention also includes improved assay methods for selecting compounds useful in reducing or preventing onset of the pathology associated with Alzheimer’s Disease.