Abstract: A recording disk device comprises a sheet-like magnetic disk medium having at least one recording surface, a jacket body enclosing the magnetic disk medium and having first and second inner surfaces faced to both surfaces of the magnetic recording medium, and upper and lower liners attached to the first and the second inner surfaces of the jacket body to remove fine dust adhered to the magnetic recording medium. The recording disk device further comprises upper and lower subsidiary liners each of which is attached to at least a part of each of the upper and the lower liners so that the magnetic disk medium rotated within the jacket body is interposed between the upper and the lower subsidiary liners with both surfaces of the magnetic disk medium kept in contact with the upper and the lower subsidiary liners. The jacket body has upper and lower shells parallel to each other with the upper and the lower liners attached thereto, respectively.

Abstract: The present invention provides a method for producing erythritol comprising cultivating microorganisms, which produce erythritol, belonging to Trichosporonoides megachiliensis in a culture medium having a high saccharide concentration and then recovering the erythritol accumulated in the culture medium. According to the present invention, cultivation period for producing erythritol can be shortened remarkably, and saccharide-based erythritol yield is excellent. Moreover, a large amount of erythritol can be produced efficiently, without much cost, since the same effect can be confirmed in case of using a culture medium at high saccharide concentration.

Abstract: An endoscope having an insertion section to be inserted into a tubular cavity, an observation lens provided in a distal end of the insertion section, and a rounded distal portion protruding from the distal end of the insertion section in the insertion direction. The observation lens is positioned with its center displaced from the forewardmost tip of the rounded distal portion.

Abstract: A process for manufacturing methanol is herein disclosed which comprises the step of reacting hydrogen with carbon monoxide and/or carbon dioxide in the presence of a synthetic catalyst obtainable by mixing, in a slurry state, (a) a beforehand prepared precipitation slurry of copper and zinc, with (b) an alumina precursor separately prepared from a water-soluble aluminum salt and a basic precipitant, to obtain a composition containing copper, zinc and aluminum, and washing, drying and then calcining the composition. A process for manufacturing the above-mentioned catalyst is also disclosed. According to the present invention, methanol can extremely efficiently be manufactured, and the catalyst having a high activity and an excellent heat resistance can also be manufactured.

Abstract: Unsaturated compounds which can be dissolved in aqueous based solvents, such as ethylenic or acetylenic carboxylate or alcohols with less than 10 carbon atoms, especially maleic and/or acrylic acid or propargyl alcohol, are reacted with alkali metal phosphite in aqueous solution at neutral or alkaline pH in the presence of free radical initiators such as persulphate to form threshold scale and corrosion inhibitors.