Abstract: There is provided an epitaxial substrate, including: a GaN substrate whose main surface is a c-plane; and a GaN layer epitaxially grown on the main surface, wherein the main surface includes a region where an off-angle is 0.4° or more, and an E3 trap concentration in the GaN layer grown on the region is 3.0×1013 cm?3 or less.

Abstract: An azetidine derivative is provided which includes 3,3-dihydroxyazetidine represented by Chemical Formula (I) or a salt thereof: ##STR1## A composition containing the azetidine derivative, and a process for producing the azetidine derivative are also provided. The azetidine derivative is a novel compound, and is useful for promoting bifidobacterium divisional multiplication.

Abstract: A semiconductor circuit device is disclosed in which an impurity ion implanted region is formed in a substrate, a Schottky junction type gate electrode is formed above the impurity ion implanted region, and a source electrode and a drain electrode are formed on both sides of the gate electrode. In this device, an InGaP barrier layer is formed between the substrate and the electrodes, a cap layer comprising a semiconductor free from In as a constituent is formed between the InGaP barrier layer and the electrodes, and the gate electrode is formed of a refractory metal.

Abstract: A semiconductor circuit device is disclosed in which an impurity ion implanted region is formed in a substrate, a Schottky junction type gate electrode is formed above the impurity ion implanted region, and a source electrode and a drain electrode are formed on both sides of the gate electrode. In this device, an InGaP barrier layer is formed between the substrate and the electrodes, a cap layer comprising a semiconductor free from In as a constituent is formed between the InGaP barrier layer and the electrodes, and the gate electrode is formed of a refractory metal.

Abstract: A coin-operated locker which is impossible to be opened when the locker is unused and which is openable by means of its door and becomes usable when a coin or coins of a predetermined amount are deposited, includes a sensor for detecting the deposit of a coin or coins, a detector for detecting the locking and the unlocking of a cylinder lock, a plunger engageable with or removable from an engaging opening of the door, and a controller for retracting the plunger from the door in response to a coin deposit signal from the sensor and for engaging the plunger with the door after a predetermined time in response to an unlock signal from the detector.