In a scanning microscope, slides are fed automatically from a magazine to the imaging system. A second dielectric material layer is formed thereafter. Microarrays with macroporous polymer substrates are useful in immunoassays, drug discovery studies and other biotechnological applications that involve large scale macromolecular interactions. An interaction may be a backchannel interaction and exclude one or more participants of a parent interaction. When contacted with an atmospheric effluent containing odor andor noxious components, the hydroxyl radicals formed oxidize the odor and noxious components to non-odor offensive, environmentally acceptable by-product.