Abstract: A novel cyclopropenone derivative (I) which possesses a potent inhibitory activity against thiol protease such as papain, cathepsin B, cathepsin H, cathepsin L, calpain or the like with excellent properties regarding oral absorbance, tissue transference and cell membrane permeability, and are clinically useful in the treatment of various diseases such as muscular dystrophy, amyotrophy. Also provided are a process for producing the compound (I) and a pharmaceutical composition containing the same.

Abstract: A resin composition comprising a polyester and a modified polyolefin, wherein said polyester has an amide bond in polymer main chain and said modified polyolefin has a carboxylic acid group or a derivative thereof.

Abstract: A method for producing an aromatic poly(thio)ether ketone having repeating units of the following formula (II): ##STR1## wherein each of R.sup.1 to R.sup.12 is a hydrogen atom, a halogen atom, a hydrocarbon group or an alkoxy group, X is an oxygen atom or a sulfur atom, provided that part of X may be a direct bond, and n is an integer of from 0 to 2, which comprises reacting an aromatic (thio)ether carboxylic acid fluoride of the following formula (I): ##STR2## wherein R.sup.1 to R.sup.12, X and n are as defined above, under pressure in an aprotic organic solvent in the presence of boron trifluoride.

Abstract: A photographic support comprising a paper substrate and the resin layers formed on both sides thereof, each of the resin layers being made of a resin composition comprising a polyethylene resin, wherein the difference in thickness between the resin layer on the side on which a photographic layer is to be provided and the resin layer on the opposite side is 3 .mu.m or greater, and the polyethylene resin in the resin layer on the side opposite from the photographic layer is a compounded resin prepared by melting and mixing a specified number of parts by weight of a specific low-density or medium-density polyethylene resin and a specified number of parts by weight of a specific high-density polyethylene resin. This resin-coated paper type photographic support has good adhesion between the base paper and the resin layer on the side opposite from the photographic layer, excellent in qualities such as anticurl properties, cutting properties and capable of high-speed production.

Abstract: Acyclic terpene compounds useful as intermediates or producing sarcophytol A which have an anti-carcinogenic promotor activity and anti-tumor activity, which compounds are shown by the general formula (I): ##STR1##

Abstract: A tetrahydrofuran derivative represented by the following general formula [I]: ##STR1## wherein A represents direct bonding or a group represented by --B--CHR.sup.1 --(wherein B represents oxygen atom, sulfur atom or imino group; R.sup.1 represents hydrogen atom or an alkyl group); R represents hydrogen atom, halogen atom, hydroxyl group, an alkoxy group, benzyloxy group, an alkylsulfonyloxy group or a group represented by --O--COR.sup.2 (wherein R.sup.2 represents an alkyl group, a haloalkyl group, an alkenyl group, a cycloalkyl group, phenyl group, benzyl group, an alkoxy group, an alkylamino group or a dialkylamino group; X represents halogen atom; Y represents hydrogen atom or halogen atom) and the herbicide containing the same as the effective ingredient. The compounds of the present invention have exceedingly high herbicidal activity, and furthermore, the compounds are superior to the known similar compounds in terms of safety on crops. Thus, the compounds are useful as herbicides.

Abstract: An electrophotographic photoreceptor comprising an electrically conductive support and a photosensitive layer formed thereon, wherein said photosensitive layer contains an arylamine compound of the formula (I): ##STR1## wherein each of Ar.sup.1, Ar.sup.2, Ar.sup.3 and Ar.sup.4 which may be the same or different, is an aryl group which may have substituents, or a heterocyclic group which may have substituents, each of R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 which may be the same or different, is a hydrogen atom, a hydroxyl group, a halogen atom, an alkyl group which may have substituents, an alkoxy group which may have substituents, or a phenyl group which may have substituents, and each of R.sup.7 and R.sup.8 which may be the same or different, is a hydrogen atom, a halogen atom, an alkyl group which may have substituents, or an alkoxy group which may have substituents.

Abstract: Disclosed is an urethane acrylate oligomer to be obtained by reacting an isocyanate group-having urethane prepolymer and hydroxyl group-having acrylate and/or methacrylate, in which the urethane prepolymer is one having isocyanurate rings and the hydroxyl group-having acrylate and/or methacrylate comprises 4-hydroxybutyl acrylate and/or 4-hydroxybutyl methacrylate. The oligomer has a much lower viscosity of itself and a much higher ultraviolet-hardening speed, than the conventional urethane acrylate oligomers, and may be hardened to give a film having excellent physical properties of flexibility, heat resistance, weather resistance of hot-cold repetition cycles and scratch resistance.

Abstract: Disclosed herein are an electrostatic image-developing toner comprising a binder resin, a quaternary ammonium salt and an acidic carbon black as colorant, and an electrostatic image developer containing the same.

Abstract: The present invention relates to a method for sizing of paper by using a particular vinylamine polymer as a size-fixing aid. By the use of the vinylamine polymer as a size-fixing aid, it has become possible to obtain a paper having superior sizing properties by papermaking at a pH around neutrality using a hitherto known acidic sizing agents without using a neutral sizing agent. The method of the present invention further has effects that operating efficiency of papermaking is greatly improved since contaminations of a papermaking machine due to a neutral agent can be avoided, and therefore, the prices of paper can be greatly lowered. The present method has further advantages when it is applied under acidic papermaking condition of a pH of less than 5.5. In such a condition, the addition amount of alum can be decreased and the life of a papermaking machine can be prolonged. In spite of a small amount of alum added, a considerably good sizing effect can be obtained by the present method.

Abstract: A pyrimidine nucleoside derivative and pharmaceutically acceptable salt thereof specified by the presence of ethyl group or isopropyl group at 5-position of the pyrimidine ring and the presence of a (substituted) phenylthio or a (substituted) benzyl group at 6-position of the pyrimidine ring is provided. The pyrimidine nucleoside derivative and pharmaceutically acceptable salt thereof show a markedly higher anti-retroviral activity than conventional analogous compounds and have a relatively low toxicity against the host cells, and therefore, are useful as an active ingredient of antiviral agent.

Abstract: A copolymer having repeating units of the following formula (I) and repeating units of the formula (II), wherein the ration of (I) to (II) is within a range of from 10:90 to 90:10 by weight ratio, and the number average molecular weight is at least 1,000, or the intrinsic viscosity .eta..sub.inh is at least 0.02: ##STR1## wherein A is a polyester unit having a polymerization degree of from 2 to 200, R.sup.3 is a bivalent organic group having an ester, urethane or ketone bond, and R.sup.4 is a hydrogen atom or a methyl group, ##STR2## wherein R.sup.5 is a hydrogen atom or a methyl group, and X is a substituent having functionality.

Abstract: A novel water-soluble enzyme protein being composed of three heterogeneous subunits and having nitrile hydratase activity was separated and purified from the bacterium of genus Rhizobium. The nucleotide sequence of the gene encoding the protein was determined; using the transformant transformed with the expression vector having the nucleotide sequence, the protein was expressed; by reacting the transformant with a nitrile in a culture broth, the corresponding amide was produced.Via the use of a culture broth containing the transformant described above or the protein itself, a nitrile can be efficiently converted into the corresponding amide.

Abstract: An apparatus for controlling drive or operation of a quenching car and/or a bucket car for a coke oven and a method therefor, capable of effectively accomplishing the automatic control of the operation of the quenching car/bucket car. A quenching car/bucket car is adapted to travel on a track due to traction by a wire rope through a winch structure, to thereby reduce the load of the quenching car/bucket car applied to the track surface to prevent positional variations on the track surface. This results in the relative positional relationship of the track surface to a quenching tower, a coke wharf/CDQ and the like being ensured.

Abstract: A method for producing an acrylonitrile crosslinked copolymer, which comprises copolymerizing, as polymerizable monomers, acrylonitrile, an alkyl ester of acrylic acid or methacrylic acid, an aliphatic or alicyclic crosslinkable unsaturated monomer having at least two allyl groups, and an aromatic crosslinkable polyunsaturated monomer, in the presence of from 10 to 45% by weight, based on the total amount of the polymerizable monomers, of an inert organic solvent having a specific gravity of at least 1.0.

Abstract: A thermal transfer recording sheet comprising a substrate and an image-receiving layer formed thereon, which is thermally transferable onto a record sheet, wherein the image-receiving layer comprises a transparent receptive layer and a white opacifying layer laminated in this order on the substrate, and the opacifying layer contains a plasticizer.

Abstract: A coupling device intended to prevent impurities such as dust and particles adhering to the end face of a solution supplying male pipe 2 from being mixed with a high purity chemical solution N, which will be supplied through the device, not to degrade the purity of the solution. It includes a check valve 7 arranged in that end portion of a solution passage 5 in the male pipe 2 which is inserted into a cleaning chamber 15, a valve pusher 44a arranged in that end portion of a solution passage 43 in a solution supplied female pipe 3 which is connected to the passage 5 in the male pipe 2 to push the check valve 7 to open the passage 5, a valve system for opening and closing the passage 43 when the female pipe 3 is reciprocated in the axial direction, and a check valve 51 located on the outlet side of a cleaning liquid passage 48.

Abstract: A liquid crystalline polyester comprising dicarboxylic acid units of the following formula (1): ##STR1## wherein R.sup.1 is a bivalent aromatic hydrocarbon group having from 6 to 18 carbon atoms, diol units of the following formula (2):--OCH.sub.2 CH.sub.

Abstract: A thermal transfer recording sheet comprising a base film, a heat transferable ink layer formed on one side of the base film and a heat resistant lubricating layer formed on the other side of the base film, wherein the heat resistant lubricating layer is formed by coating on the base film a coating solution containing at least a binder resin and at least two mutually reactive modified silicone oils, and then reacting the mutually reactive modified silicone oils.

Abstract: A catalyst for polymerizing an olefin which consists essentially of a product obtained by contacting (A) a metallocene-type transition metal compound, (B) at least one member selected from the group consisting of clay, clay minerals, ion exchanging layered compounds, diatomaceous earth, silicates and zeolites, and (C) an organic aluminum compound.