Bone matrix compositions and, more specifically, demineralized bone matrix having increased osteoinductive capacity and methods for its production are provided. In one embodiment, a converter module is attached to each of a plurality of solar photovoltaic panels and its output is attached in a parallel manner to a common buss that forms the input to a DC AC inverter. The present invention relates to bifunctional molecules and complexes which are useful as positive control reagents in antibody based diagnostic tests. 5 to about 4 turns, is re-crystallized, is arranged in the envelope, and is connected between ends of the inner conductive wires. The second regulating unit comprises an auxiliary switch, to which the supply of electric power is arranged to occur via a safety relay and a current measuring unit.