A hydrogen diffusion barrier in an integrated circuit is located to inhibit diffusion of hydrogen to a thin film of a metal oxide, such as a ferroelectric layered superlattice material, in an integrated circuit. The present invention provides methods and compositions relating to altering cellulose synthase levels in plants. 5 cm2 filter that is mounted on a side of an electret ion chamber such that the collected progeny are exposed to the inside of the chamber. The first valve member has a closed position seated in a first annular valve seat and an open position spaced apart from the first valve seat.