A double-tuned circuit of a tuner that can be switched for tuning to a plurality of frequency bands by turning a switching diode ON or OFF restrains degradation of a selectivity caused by an undesirable additional tuning circuit or parasitic tuning circuit formed by a capacitance generated when the switching diode is OFF and inter-terminal capacitance of a resistor. The polymer dielectric layer physically contacts the first electrode sheet and the second electrode sheet via the top surface thereof, and the cooling sheet via the bottom surface thereof, and exhibits a coefficient of thermal conductivity above 1. An additional benefit is that the lighted target ring reduces ice and water spray outside of the container being filled. The rotation direction of the depolarizer can be adjusted to selectively direct left-handed circularly polarized and right-handed circularly polarized radiation either to the vertical or the horizontal output. Upon seed treatment with GA3 free sap, \u03b1-amylase enzyme activity in the germinating seed of mung bean is found to be increased.