Abstract: The object of the invention is to provide a method for developing a novel species by means of interspecific crossbreeding among P. eryngii (DC.:Fr.) Quel., P. eryngii (DC.:Fr.) Quel. var. elaeoselini, P. eryngii (DC.:Fr.) Quel. var. tuoliensis C. J. Mou and P. nebrodensis (DC.:Fr.) Quel., which are not native in Japan, and P. ostreatus (Jacq.: Fr.) Kummer, which is native in Japan and the novel species obtained by the method and is also to provide a novel species of Pleurotus spp. carrying both a P. eryngii (DC.:Fr.) Quel. gene and a P. ostreatus (Jacq.: Fr.) Kummer gene by crossbreeding P. ostreatus (Jacq.: Fr.) Kummer with P. eryngii (DC.:Fr.) Quel. var. tuoliensis C. J. Mou, P. nebrodensis (DC.:Fr.) Quel. or P. eryngii (DC.:Fr.) Quel. var. ferulae Lanzi, thereby obtaining a strain capable of further crossbreeding with P. eryngii (DC.:Fr.) Quel., P. eryngii (DC.:Fr.) Quel. var. elaeoselini or the like.

Abstract: The object of the invention is to provide a method for developing a novel species by means of interspecific crossbreeding among P. eryngii (DC.:Fr.) Quel., P. eryngii (DC.:Fr.) Quel. var. elaeoselini, P. eryngii (DC.:Fr.) Quel. var. tuoliensis C.J. Mou and P. nebrodensis (DC.:Fr.) Quel., which are not native in Japan, and P. ostreatus (Jacq.: Fr.) Kummer, which is native in Japan and the novel species obtained by the method and is also to provide a novel species of Pleurotus spp. carrying both a P. eryngii (DC.:Fr.) Quel. gene and a P. ostreatus (Jacq.: Fr.) Kummer gene by crossbreeding P. ostreatus (Jacq.: Fr.) Kummer with P. eryngii (DC.:Fr.) Quel. var. tuoliensis C.J. Mou, P. nebrodensis (DC.:Fr.) Quel. or P. eryngii (DC.:Fr.) Quel. var. ferulae Lanzi, thereby obtaining a strain capable of further crossbreeding with P. eryngii (DC.:Fr.) Quel., P. eryngii (DC.:Fr.) Quel. var. elaeoselini or the like.

Abstract: A new and distinct variety of mushroom plant of Bunashimeji mushroom, Hypsizigus marmoreus, names “Hokuto-18”, is cultivated by gathering and repeated breeding of fungal strains having dominant traits. This new and distinct variety has good qualitative character and appearance, good keeping quality and storage life and delicious tasting and is exquisite in stability, reproducibility and uniformity when being produced.

Abstract: The active vibration-isolating device of the invention is used for preventing vibrations due to ground motions or running of an automobile from being propagated to a platform which is disposed in, for example, a semiconductor device factory or a laser device factory, and on which various kinds of equipment are to be mounted, and also from causing the platform to vibrate. The device has: an air spring which elastically supports a platform; a piston-like member which abuts against and supports the platform; plural piezoelectric actuators which can be externally controlled; a working fluid such as an aqueous solution of ethylene glycol which transmits driving displacements of the piezoelectric actuators to the piston-like member via piston members which are respectively fixed to ends of the piezoelectric actuators in a driving direction x; and a fluid path in which the working fluid is hermetically filled.

Abstract: A welding control circuit comprises a differential type operational amplifier preferably having at least first, second and third input terminals. A signal S.sub.1 corresponding to the desired output of an electric welder to be controlled is applied to the first input terminal of the amplifier; a signal S.sub.0 for setting the output of the welder to initially approximate the desired output is applied to the second input terminal of the amplifier; and a feedback signal S.sub.2 is applied from the welder to the third input of the amplifier. The circuit constants of the adder-subtractor circuit are selected so that the ratio of the output S of the adder-subtractor circuit to the input signal S.sub.0 is a (in the absence of other input signals) whereas the ratio of the output S to the input signals S.sub.1 and S.sub.2 is b (in the absence of other input signals). The adder-subtractor circuit is connected so that its output is given by S = aS.sub.0 + b(S.sub.1 - S.sub.2).

Abstract: An AC voltage regulator which detects the instantaneous supply voltage in a phase shifter and compares it with the reference voltage by a comparator circuit so that in response to the output signals from the comparator, the firing angle of the thyristors connected to a supply voltage circuit may be controlled in order to maintain constant the effective load current.

Abstract: A new and distinct variety of mushroom plant of Bunashimeji mushroom, Hypsizigus marmoreus, named ‘Hokuto-18’, is cultivated by gathering and repeated breeding of fungal strains having dominant traits. This new and distinct variety has good qualitative character and appearance, good keeping quality and storage life and delicious tasting and is exquisite in stability, reproducibility and uniformity when being produced.