An apparatus for and a method of feeding powders to a subsequent processing step. In particular, the apparatus includes a first hopper, a first metering brush feed, an intermediate chamber, a second distribution brush, a level sensor, and a supply hopper to deliver powder to a pair of rollers. In one embodiment, the hopper is fitted to the roller diameter to produce a uniform, ribbon or free-standing sheets suitable for air-breathing battery and fuel cell electrodes.

 
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> Device and methods for detecting the response of a plurality of cells to at least one analyte of interest

> Ceramic materials for 4-way and NO.sub.x adsorber and method for making same

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