This invention relates, in part, to newly identified methods of using quinolone antibiotics, particularly a gemifloxacin compound against certain pathogenic bacteria. The diffraction optical element has at least one of an incident surface having a convex shape in a sub-scanning cross-section facing the deflection device and an exit surface having a convex shape in the sub-scanning cross-section facing the surface to be scanned. R5 represents a hydrogen atom or an alkyl group having 1 to 18 carbon atoms, and X represents a nitrogen atom or a phosphorus atom. The agent comprises logic andor data necessary to implement processes on the second monitoring agent while the conveyance is at the second port. As thus rendered, a representation of the background is rendered in a first plane, while a representation one of the characters has a top surface of the character rendered in a second plane, and a representation of the one of the characters having the certain character attribute has a top surface of the character rendered in a third plane. Bracing screws can be screwed into a threaded receiver of the base element and during this are supported under tension in a bracing receiver of the holder shaft of the chisel holder.