Abstract: A method and an apparatus for sterilizing objects, such as animal cages, are disclosed. The apparatus includes a housing that defines a sterilizing chamber for the objects. The apparatus includes a first air inlet in fluid communication with the sterilizing chamber, and a first air outlet in fluid communication with the sterilizing chamber. The first air inlet and the first air outlet are structured to be placed in fluid communication with a source of dry heat. A second air inlet is in fluid communication with the sterilizing chamber and a source of filtered air. A second air outlet in fluid communication with the sterilizing chamber and an exterior space outside of the sterilizing chamber. Dry heat flows in the first air inlet, over the objects in the sterilizing chamber, and out the first air outlet. Dampers are then closed to seal off the first air inlet and the first air outlet.

Abstract: An antigen delivery system utilizing a biodegradable polymer with good mechanical properties in combination with a material stimulating the immune system. The material having adjuvant activity may be polymer degradation products or an adjuvant which is contained within or bound to the polymer. In one embodiment, the polymer is formed from tyrosine dipeptides. Poly(CTTH-iminocarbonate) is a preferred tyrosine dipeptide polymer for constructing implantable delivery systems for antigenic material. The polymer is not an adjuvant in itself but degrades into products which stimulate the immune system. The tyrosine dipeptide can also be used as a conventional adjuvant.