Abstract: In a composite semiconductor device which is provided with a normally-on-type first transistor and a normally-off-type second transistor which are serially connected, the second transistor is selected so as to satisfy Formula (1): C oss > C ds ? V ds V br - C ds - C gs ( 1 ) In this regard: Coss: output capacitance of second transistor Cds: drain to source capacitance of first transistor Cgs: gate to source capacitance of first transistor Vds: power supply voltage Vbr: breakdown voltage of second transistor.

Abstract: In a composite semiconductor device which is provided with a normally-on-type first transistor and a normally-off-type second transistor which are serially connected, the second transistor is selected so as to satisfy Formula (1): C oss > C ds ? V ds V br - C ds - C gs ( 1 ) In this regard: Coss: output capacitance of second transistor Cds: drain to source capacitance of first transistor Cgs: gate to source capacitance of first transistor Vds: power supply voltage Vbr: breakdown voltage of second transistor.

Abstract: Disclosed are a novel fructosylamine deglycase characterized by the specificity to amadori compounds of catalyzing oxidation of the compounds to produce an .alpha.-ketoaldehyde, an amine derivative and hydrogen peroxide; a method of producing the novel enzyme by cultivating microorganisms belonging to the genus Candida and having an ability of producing the novel enzyme; and a method of quantitative determination of amadori compounds by applying the novel enzyme to a sample containing amadori compounds to measure the amount of the hydrogen peroxide to be formed by the oxidation reaction or measure the amount of the oxygen to be consumed by the reaction to thereby obtain the amount of the amadori compounds from the measured value. The invention provides a novel enzyme characterized by the high specificity to the reaction with amadori compounds, especially that having therein a saccharide moiety as bonded to the .epsilon.