Abstract: The present invention provides a method for producing a high purity N4-acylcytidine derivative. More specially, the invention provides a compound represented by the formula (1): wherein R1 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, an alkynyl group having 2 to 4 carbon atoms, a perfluoroalkyl group having 1 to 4 carbon atoms, or a halogen atom; R2 is a hydrogen atom, an alkoxyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms with a substituent, or a halogen atom; R3 represents a methyl group or a phenyl group; and M represents a positive ion of an alkali metal or an alkaline earth metal, and a compound represented by the formula (2): wherein R1, R2, and R3 are as defined above, produced by using the compound represented by the formula (1).

Abstract: A novel gluconate dehydratase derived from Achromobacter xylosoxidans and a gene encoding the gluconate dehydratase are provided. By reacting the gluconate dehydratase or a transformed cell containing the gene with an aldonic acid, the corresponding 2-keto-3-deoxyaldonic acid can be efficiently produced.

Abstract: An aldose having n-1 carbon atoms is produced from an aldonic acid having n carbon atoms using hypochlorous acid or a hypochlorite in a high yield at low cost with safety, by treating the reaction mixture with a compound having reactivity with the hypochlorous acid or hypochlorite higher than that with the produced aldose.

Abstract: The present invention improves the start-up characteristics of a fuel gas generating apparatus for a fuel cell comprising a reformer. In a fuel gas generating apparatus 1 for a fuel cell comprising a vaporizer 22 that generates a fuel vapor by vaporizing a raw liquid fuel, a reformer 11 that generates a reforming gas that includes hydrogen from the raw fuel gas that has been partially oxidized by adding reforming air to the fuel vapor generated by the vaporizer 22, and a CO eliminator 13 that generates a fuel gas having carbon monoxide eliminated by adding a CO eliminating air to the reforming gas generated by the reformer 11, the supplied amount of the reforming air during the warm-up of the fuel gas generating apparatus for a fuel cell is larger than the supplied amount of reforming air during idle operation after completion of the warm-up.

Abstract: An organic silicon compound emulsion for quickly imparting excellent water-repellent properties to the surfaces of porous inorganic base materials such as concrete, mortar, and masonry. The emulsion is prepared by the steps of emulsifying a mixture consisting of (A) an organoalkoxysilane, (B) an organopolysiloxane having in its molecule at least 2 alkoxy groups or hydroxyl groups bonded to a silicon atom, (C) an anionic emulsifying agent, and (D) water, and heat aging the emulsion at a temperature below 100° C. In another embodiment, the method comprises the steps emulsifying a mixture of the components (A) to (D) and adding an acidic or alkaline substance to the emulsion. In a third embodiment, the method comprises the steps of forming a mixture consisting of the components (A) to (D), adding an acidic or alkaline substance thereto, and performing the emulsification thereafter.

Abstract: A novel method for preparing silicone rubber particulates coated with metal oxide microparticles, wherein the metal oxide microparticles are derived from a sol, is disclosed. The silicone rubber particulate so prepared has the advantage of reducing aggregation of the particulate mass. The silicone rubber particulate has particular utility as an additive to organic resins for modifying the properties thereof.

Abstract: The present invention relates to a water-repellent composition for a vehicle window glass which does not cause corrosion of metal components such as wipers, said composition being prepare by mixing:(A) 100 parts by weight of an organosilane having the formulaR.sup.1.sub.a SiX.sub.(4-a)wherein R.sup.1 is a monovalent hydrocarbon group having 3 to 20 carbon atoms, X is a hydrolyzable group and a is an integer having a value of 1 to 3; and(B) 10 to 1,000 parts by weight of a diorganopolysiloxane having a viscosity of 0.65 to 500 centistokes at 25.degree. C. and having the formula ##STR1## wherein R.sup.2 is a monovalent hydrocarbon group having 1 to 6 carbon atoms and n is an integer having a value greater than 0, said composition being free of acid having an acid dissociation index (pKa) below 5.0.

Abstract: A silicone-modified water-based coating composition is disclosed wherein a suspension of silicone rubber particles in water is added to a water-based coating composition such that the resulting system is storage-stable and forms a mat film when dried or cured, which film is soft to the touch.

Abstract: In a searching boat having a searching system for searching a spillage oil on the sea, the searching system comprises a driving device, an oil film appreciating device, and a radio transmitter. The driving device drives the searching boat in a predetermined direction on the spillage oil on the sea. The oil film appreciating device appreciates an edge of an oil film of the spillage oil to produce an oil edge appreciating signal. Supplied with the oil edge appreciating signal, the radio transmitter produces an arrival signal. The driving device may drive the searching boat in a forward direction as a forward mode driving when supplied with a start signal and may drive the searching boat in a backward direction opposite to the forward direction as a backward mode driving when supplied with the oil edge appreciating signal. Furthermore, the driving device may carry out the forward and the backward mode drivings every time when supplied with the oil edge appreciating signal.

Abstract: A method for the manufacture of silicone rubber moldings comprises the preparation of a silicone rubber composition by blending an organoperoxide having an activation energy of 25 to 41 kcal/mol into a semicurable organopolysiloxane composition whose main component is organopolysiloxane having organoperoxide-crosslinkable functional groups. The silicone rubber composition is made into a particulate form and heated at a temperature below 100 degrees Centigrade to produce a semicured, particulate molding material which retains the activity of the organoperoxide and which contains residual crosslinkable functional group on the organopolysiloxane. Subsequently a mold is filled with the molding material and the mold material is completely cured at a temperature of at least 100 degrees Centigrade under the application of pressure. The method is particularly useful for automatic molding methods.

Abstract: One-part organosiloxane composition curable by a platinum-catalyzed hydrosilation reaction contain the catalyst encapsulated within finely divided particles of a cured silicone rubber. The compositions are storage-stable for up to several days at room temperature, yet cure relatively rapidly when heated.