A transmitter and method for transmitting transponder or TCAS signals uses linear amplification to save on circuit component weight, cost and size while enabling precise amplification and control of the transmitted signal. The compound is a mixture of the 2\u2032 and 3\u2032 regioisomers of O-acetyl-ADP ribose, and is formed nonenzymatically from 2\u2032-O-acetyl-ADP-ribose, which is the newly discovered product of the reaction of Sir2 enzymes with acetylated peptides and NAD+. The detachable armrest and support tray includes a mount for securing the armrest support unit to a chair arm and a first portion hingedly attached to the mount for allowing the first portion to swivel in relation to the mount. In a further embodiment, a sensor is positioned to detect a power condition associated with the memory subsystem. Also, at least one measurement of signal strength as measured at the STA device for each of the plurality of AP devices may be obtained, and automatic selection of one of the plurality of AP devices may further take into account the at least one measurement of signal strength for each AP device. Partial beams leaving the optical interfaces are optically diverged to illuminate different segments of a linear scanned array aligned in the meridional plane.