A nonreciprocal circuit element includes a magnetic plate having through holes; center conductors crossing each other at a predetermined angle on a side associated with a first surface of the magnetic plate; and a common electrode disposed on a side associated with a second surface of the magnetic plate and connected to the center conductors via the through holes. The therapeutic composition includes a pharmaceutical substance effective for treating mucositis formulated with a biocompatible polymer, such as a biocompatible reverse-thermal gelation polymer. The method includes storing a pressurized substance, receiving an activation signal at a spray delivery device, and releasing the pressurized substance in response to the received activation signal. In operation when it is desired to elevate the string from the well, the fluid within the string is pressurized sufficiently to rupture the disc, thereby allowing fluid within the string to drain. Other embodiments include using in combination the Z-Bell Test andor light blocking or altering devices for diagnosis and treatment. Each carriage rotatably carries a roller adapted to drivingly engage and convey a film in a predetermined direction toward an article to be packaged.