An optical semiconductor device includes an optical semiconductor element, a semiconductor region, and a buried layer. The biological activity of the complexes produced are comparable to the formulations prepared according to the prior art admixture method and upon purification, the complexes produced by the method of this invention are 50 to 500 fold more concentrated than the complexes formed by admixture. The controller has a trigger switch that is coupled to a power source, such as a battery, and includes a main power onoff switch and a potentiometer. A loop area is provided in the printer for accumulating one of the sections of the perforated paper stock. The latching portions of the arms of the first ring member engage the latch-receiving recesses of the second ring member, while the latching portion of the arms of the second ring member engage the latch-receiving recesses in the first ring member. Zooming and other browsing options are available to the user to view objects of interest at varying levels of detail.