Abstract: A magnetic recording disk accommodated in a casing is rotated and air in the casing is drawn through air sucking openings formed in the upper and lower sides of the casing.

Abstract: A method of restoring the immune response of a patient having a lowered immune response level is provided, in which the patient is given an effective amount of certain nitrogen-containing polysaccharides derived from Coriolus versicolor (Fr.) Quel, where the polymer units having a molecular weight of below about 5,000 have been removed therefrom.

Abstract: A fruit body of Ganoderma lucidum (Fr.) Karst. having a long stipe is prepared by the method of the invention comprising the following steps;(a) cultivating a seed culture of a Ganoderma lucidum (Fr.) Karst. strain in an artificial solid medium to obtain a fungal tissue bed,(b) maintaining the fungal tissue bed at a humidity of at least 90% and an illumination intensity of at most 500 l.times. to form selectively a primordium of fruit body from the fungal tissue bed, and(c) maintaining the resulting culture at a humidity of from 40 to lower than 90% and an illumination intensity of at least 500 l.times. to form a fungal pileus of the fruit body from the primordium.

Abstract: Disclosed is a method for producing the high-quality mycelia of the Basidiomycetes from culture thereof by promoting growth of the fungus as well as differentiation of the cells and attendant organization thereof by adding to the culture medium a straight chain saturated aliphatic alcohol with a catbon number within a specified range of 26 to 36 carbon atoms.

Abstract: In submerged culture of a Basidiomycete belonging to the genus Coriolus, the seed culture to be inoculated into the medium is homogenized to form a homogenous slurry and the slurry-formed seed culture is inoculated into the medium. This improves the cultivation rate of the Basidiomycetes.

Abstract: In cultivation of the Basidiomycetes under aeration and agitation in an aqueous liquid medium containing saccharide as a carbon source and yeast extract, peptone, casamino acid and/or meat extract as nutrient, the initial charge of the medium is adjusted such that it is less than about 70% of the capacity of the fermentor used, and the medium or at least one component thereof is supplied additionally in portions as cultivation advances. Such control of the medium feed suppresses excessive foaming which occurs in the aqueous medium during cultivation, and allows smooth and efficient cultivation of the Basidiomycetes.

Abstract: The fungi belonging to the Coriolus genus is first extracted with water or a dilute alkaline solution and then further extracted stepwise by using alkaline solutions with gradually increased concentrations to obtain a nitrogen-containing polysaccharide having an anti-tumor activity in a high yield.

Abstract: The fungi belonging to the Coriolus genus are extracted by using a dilute alkaline solution having a concentration within a certain specified range whereby the low molecular weight substances with molecular weight of less than 5,000 are obtained in there extract solution. These low molecular weight substances are separated from the extract solution to obtain a nitrogen-containing polysaccharide having excellent anti-tumor activity.

Abstract: When a dikaryotic mycelium of Coriolus versicolor (Fr.) Quel. (a species of fungi belonging to the genus Coriolus of Polyporaceae) is subjected to a mechanical treatment such as grinding or shearing in a liquid medium, or when such mycelium is subjected to submerged culture while undergoing mechanical treatment, there is produced a monokaryotic mycelium which is different from the dikaryotic mycelium in morphological and physiological characteristics. The thus obtained monokaryotic mycelium is a novel product and characterized by its extremely high propagation rate as compared with the known dikaryotic mycelium. Also, the substance extracted from the culture of the mycelium has excellent physiological activities.

Abstract: A fungus belonging to genus Coriolus of the class Basidiomycetes is subjected to submerged culture in a liquid medium and the obtained culture is dried and extracted with an aqueous solvent, and then the substances with molecular weights of less than 5,000 are eliminated from the extract solution, whereby a polysaccharide having anti-cancer and other pharmacodynamic effects is obtained in a high yield.

Abstract: Polysaccharides are produced by purifying a liquid extract of a mycelium of a strain of fungus species belonging to the class Basidiomycetes or the filtered broth of a cultured medium in which a mycelium of a selected strain of Basidiomycetes has been incubated; the polysaccharides exhibiting an anticarcinogenic activity in mice.