The application discloses a radio-frequency transponder having a tamper loop functionality the state of which is readable. The polymer system includes a non-ionic copolymer of a substituted or non-substituted olefin monomer and an anhydride monomer. The dispersed amount of the cement material is adjusted to maintain the temperature of the extracted gas between 950\xb0 C. A centrally located button may be positioned at an approximate center of the circular group of input buttons. A reducing-agent supply device is provided for supplying a denitration catalyst with the reducing agent, such that the reducing agent is introduced into a portion of an exhaust passage of the internal combustion engine which is upstream of the denitration catalyst. The alteration of the one or more environmental parameters in a specifically timed manner can be used to induce and maintain synchronous cell division.