The present invention provides a protein having aurone synthase activity involved in the color of flowers such as snapdragons, a gene that encodes it, cDNA in particular, and its applications. The inputoutput bridge monitors requests to free buffers in memory received from cores and IO units in the network services processor. A chopper-demodulator of the switched operational amplifier chopper-demodulates the amplified chopper-modulated signal outputted from the amplifier circuit according to the control signal, and outputs a demodulated output signal as a chopper-amplified output signal from an output terminal. The chamber, with the scent material and float installed therein, is then hermetically sealed to prevent escape of the scent therefrom.