In printing apparatus, an edge sensor detects a serpentine amount caused by transportation of a web. In response to identifying the presence of at least one type of file system resident on the optical medium, the system readies a media driver of an apparatus to make the at least one file system available for access. The sliding collar moves between a first position and a second position to restrain the bristles at the desired leading end of the pig and forces the bristles downward and away from the inner wall surface of the pipeline. The P-trap chlorinator performs and combines the functions of a P-trap and a chlorinator. In certain embodiments, the present invention relates to compounds, compositions thereof, and methods that enhance the ability of mammalian red blood cells to deliver oxygen, by delivering IHP to the cytoplasm of the red blood cells.