The present invention concerns therapeutic agents that antagonize the activity of glucagon. A configuration system uses a un-typed syntax tree with transactional semantics layered under a set of late-bound semantic constraints. The filters are supported by fixing guides disposed at sidewalls of an air inflow hole of the dust-collecting chamber. In another embodiment, a dielectric layer is deposited onto the first conductive layer, and the plasma treatment lessens if not eliminates the ability of the first conductive layer to incorporate oxygen from the dielectric. Next, a silicon nitride layer is formed on the silicon oxide layer.