Peptide analogs of peptide YY, compositions comprising them, and methods of using those analogs or compositions for the treatment and prevention of metabolic disorders, for example disorders of energy metabolism such as diabetes and obesity, and for reduction in appetite, reduction in food intake or reduction of calorie intake in a subject, are provided herein. The device cover assembly is molded directly over an electronic device, such as a resistor or a capacitor, that requires both electrical isolation and effective cooling. The system may employ digital beam forming techniques for transmission and steering of a beam to a specific sensor tag or group of tags in an cell. A valving member including a shaft segment is positioned within the aperture, wherein the valving member is configured to rotate about an axis defined by the shaft segment for selectively closing and opening the disc valve.