A system and method for adaptive sigma-delta modulation. The different fiber or tape types are physically dissimilar but may be chemically different or substantially chemically similar. Some devices may include a compliant wall configured to stretch responsive to pressure generated by combustion of a fuel in the combustion chamber. The labeled sample placed in the testing zone is excited by the linear scanning light and generates emission light to be received by the light receiver. ;n and m are each independently an integer of 0 to 3;n+m is an integer of 0 to 3;R5 is a hydrogen atom or substituted lower alkyl;its pharmaceutically acceptable salt, or a solvate thereof. The use of such an organic acid stabilizer results in an unexpected reduction in the amount of residue deposited on the heating surface employed to vaporize the sterilizing composition.