In one embodiment, a catalyst composition comprises from about 5 weight percent to about 70 weight percent of silica-alumina; from about 30 weight percent to about 90 weight percent alumina; and from about 0. In particular, compositions of the present invention are present in a pressurized container comprising a quick-breaking alcoholic foaming agent, such that when the composition is released, i. Inserted exchangeably in this groove is a perforating knife, the perforating edge of which protrudes over the peripheral surface of the knife holder. The second driving member is moved in the optical axis direction relative to the first driving member by the rotation of the first driving member. Whereby, the observation optical system can be made so compact as to be applicable to an image display apparatus for cellular phones or portable intelligent terminals, and provides a bright view of an electronic image and a see-through image with high definition. Prior to the NMOS pass gates along the second sampling pathway, the input voltage passes through a source-follower gate, which translates the input voltage down, so that the second output signal tracks the input voltage from a turn-on voltage of the source-follower gate up to Vdd.