Silicone acrylic hybrid compositions prepared by reacting together silicone polymers, silicone resins, and silyl containing acrylic polymers are useful in adhesive compositions that find use in skin contact applications. Methods of treating allografts and methods for determining microbial contamination using the apparatus. The aperture layer material typically also includes nitride. The algorithm attempts to determine whether a proposed plan is a safe plan that can be used for correctly evaluating the query. Three light emitting diodes each having a light diffusion axis that is substantially perpendicular to the horizontal axial plane may be positioned near the first focus of each reflector. Further, the rotating shaft of the display means is electrically driven.