System and method are provided to transmit simultaneously a first and a second communication channel in a single-carrier waveform format with disparate error rate requirements. Tension andor compression can be imposed on a substrate through selection of appropriate gate sidewall spacer material disposed above a device channel region wherein the spacers are formed adjacent both the gate and the substrate and impose forces on adjacent substrate areas. The thickness of mask material has an attenuation percentage of less than 75% and, in a preferred embodiment, about equal to 29%. The downhole unit is operable to house the logging tool. Such first and second openings are advantageously provided for providing room for feet or foot placement and leg movements as the hamstring exercise apparatus is propelled forward during use. Use of the therapeutic compositions comprising one or more peptides of the invention in the manufacture of medicaments for treating sensitivity to Lol p V or an allergen immunologically related to Lol p V, or for general ryegrass sensitivity in an individual, is also provided.