Method and apparatus for generating an acid or base, e. The plasma display apparatus may include an upper substrate positioned facing a lower substrate, an upper electrode pair including a scan electrode and a sustain electrode formed on the upper substrate, an address electrode formed on the lower substrate, and at least one barrier rib positioned between the upper substrate and the lower substrate. The contact is configured to be connected to the conductor of the cable. A plurality of pairs of transistors are provided, each having a source selector and a drain selector. Each of the socket and plug fluid connectors includes a check valve in the flow channel. Use of the said ester comprising an aromatic group to improve the photoprotective power of compositions intended for protecting the skin andor the lips andor integuments against UV radiation.