In a pressure reducing valve, a piston is disposed in a piston slide hole of a body so as to be displaceable along an axial direction thereof. A first keypad is always accessible, whilst a second keypad is accessible only in the extended position. The channel matrix includes rows and columns of channel numbers, each corresponding to one channel in a group of channels. Preferably, the cell to which an hydroxylamine derivative is administered is an eukaryotic cell. A multi-use handle may also be included with the apparatus. The heat treated graphite nanofiber catalysts are suitable for catalyzing chemical reactions such as oxidation, hydrogenation, oxidative-dehydrogenation, and dehydrogenation.