Abstract: p-Substituted halogenated benzene derivatives are prepared at a high selectivity by halogenating benzene and/or benzene derivatives by using as a catalyst a zeolite modified with a metal salt.

Abstract: Process for producing polyamines by a catalytic reduction reaction of a cyanoethylated N-(2-aminoethyl)piperazine and cyanoethylated compounds of polyamines containing 4 or more amino groups in the molecule.

Abstract: A process for producing stable .alpha.-L-aspartyl-L-phenylalanine methyl ester, which comprises heat-treating crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester having a water content of from 5 to 15% by weight based on wet crystals, at a temperature of higher than 50.degree. C. and lower than 80.degree. for at least 30 minutes.

Abstract: A process for the gas phase polymerization of vinyl chloride, which comprises homopolymerizing monomeric vinyl chloride or copolymerizing monomeric vinyl chloride with a monomer copolymerizable therewith in the gas phase at a polymerization temperature of 55.degree. C. to 65.degree. C. under such conditions that the ratio Pr of the polymerization pressure to the saturated vapor pressure at the polymerization temperature is in the range of 1>Pr>0.5, wherein a mixture comprising diisopropylperoxy dicarbonate and di-2-ethoxyethylperoxy dicarbonate at a weight ratio of from 3/2 to 85/15 is used as the initiator.

Abstract: Halogen-containing polyacrylate derivatives having the formula: ##STR1## wherein A is a structural unit derived from a copolymeriazable monomer having a double bond; R is ##STR2## wherein each of R.sub.1 and R.sub.2 is a hydrogen atom or a fluorinated methyl group, provided R.sub.1 and R.sub.2 are not hydrogen atoms at the same time, and R.sub.3 is a hydrogen atom or a lower alkyl group; X is a halogen atom or a methyl group; and m is a positive integer, n is 0 or a positive integer, and n/m from 0 to 2, preferably from 0 to 1 are disclosed.Also disclosed are methods for forming a resist pattern by using the halogen-containing polyacrylate derivatives as a resist material.

Abstract: Aromatic sulfide amide polymers composed of a repeating unit having the formula (I) and a repeating unit having the formula (II) below, having an inherent viscosity ranging from 0.02 to 10 dl/g. ##STR1## wherein, Ar.sup.1, Ar.sup.2, Ar.sup.3 and Ar.sup.4 are same or different aromatic rings and R.sup.1, R.sup.2, R.sup.3 and R.sup.

Abstract: A nozzle device in an apparatus for biochemical reaction, including a biochemical reaction chamber, includes a nozzle having a tip and a porous filter fixed to the tip. The nozzle further includes an outer nozzle tube defining a first bore extending to the tip, a second bore extending through the porous filter and being coaxial with the first bore, an inner tube extending through the first bore to the tip and defining a third bore, the inner tube being tightly fitted into, and extending through, the second bore and having an outer diameter smaller than that of the inner diameter of the first bore to define an annular space in communication with the filter. The third bore is connected to a source of liquid and the annular space is connected with a source of suction, so that a liquid can be discharged to the reaction chamber from the first bore and sucked out of the reaction chamber through the filter.

Abstract: A process for producing dry .alpha.-L-aspartyl-L-phenylalanine methyl ester having an improved solubility from wet crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester having a water content of at least 20% by weight, which comprises drying the wet crystals at a temperature of higher than 50.degree. C. to obtain moist crystals having a water content of less than 20 and more than 15% by weight, then drying the moist crystals at a temperature of not higher than 50.degree. C. to obtain semi-dry crystals having a water content of less than 5% by weight, and further drying the semi-dry crystals at a temperature of higher than 50.degree. C. to obtain dry crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester.

Abstract: Process for injecting a minute volume of a solution from a nozzle device by positive pressure applied from a source of compressed air with or without positive pressure applied in parallel from a cylinder device, comprising applying the positive pressure from the compressed air source at least in a final period of injection. The process enables in injecting minute volumes of solution to remarkably decrease the injection error due to a small fraction of solution remaining at the lower end of the nozzle and can be applied to advantage to those apparatus for analyses and measurements which strictly require precision in injection.

Abstract: Anions in an aqueous solution can be quantitatively measured at a high sensitivity while controlling the electroconductivity possessed by an eluant to a low level, by the chromatographical analyzing method wherein a separating column, a cation exchange column and an electroconductivity detector are connected in the recited order, an aqueous solution containing an amine compound as an electron donor is used as an eluant, and a cation exchange column composed of the cation exchange resin substituted with a metal ion as an electron acceptor is used as the cation exchange column.

Abstract: A method and apparatus for separating and analyzing using liquid chromatography, wherein an eluate from a chromatographic column is treated by dialysis using an amphoteric ion exchange membrane.

Abstract: A pipetting device is formed of a supporting frame, a slider mounted on the supporting frame for vertical movement, a plunger type stem having a lower end fittable within the upper end of an approximately inverted cone shaped nozzle tip, the stem being mounted for vertical movement on the slider, and a conduit for supplying the lower end of the stem with an air supply and exhaust device so that the nozzle tip may be communicated with air or air may be sucked therefrom. A rotating cam cooperates with a pin on the slider for vertically moving the slider by a large stroke. An air cylinder has a piston fixed relative to the stem for vertically moving the stem by a small stroke. A lever loosely mounted on the lower end of the stem can engage the nozzle tip for removing the nozzle tip from the stem.

Abstract: A zirconia type sintered body consisting essentially of 50 to 98% by weight of zirconia (ZrO.sub.2) containing 1.5 to 5 mole % of yttria (Y.sub.2 O.sub.3) and 50 to 2% by weight of alumina (Al.sub.2 O.sub.3), spinal (MgAl.sub.2 O.sub.4) or mullite (3Al.sub.2 O.sub.3.2SiO.sub.2), and having a three-point bending strength of at least 1700 MPa is provided. This sintered body is prepared by a process wherein a powdery composition consisting essentially of 50 to 98% by weight of (a1) a powder of zirconia containing 1.5 to 5 mole % of yttria or (a2) a mixture comprising 1.5 to 5 mole % of yttria powder and 95 to 98.5 mole % of a zirconia powder and 2 to 50% by weight of (b) a powder of an alumina type oxide selected from alumina, and alumina-magnesia type oxide, an alumina-silica type oxide, a mixture of alumina and magnesia and a mixture of alumina and silica is subjected to a hot isotactic pressing treatment under a pressure of at least 50 MPa at temperature of 1300.degree. C. to 1700.degree. C.

Abstract: Disclosed is a process for the preparation of high .alpha.-type silicon nitride powder, wherein a nitrogen-containing silane compound and/or amorphous silicon nitride is crystallized to form crystalline silicon nitride. In this process, crystalline silicon nitride having a particle size not larger than 0.05 .mu.m is incorporated in an amount of at least 0.1% by weight into the nitrogen-containing silane compound and/or amorphous silicon nitride, the mixture is formed into a power or molded body having a powder bulk density of at least 0.1 g/cm.sup.3 as silicon, and the powder or molded body is heated to 1,350.degree. to 1,700.degree. C. while controlling the temperature-elevating rate to at least 15.degree. C./min throughout the temperature range of from 1,200.degree. to 1,350.degree. C. The resulting high .alpha.-type silicon nitride is composed of a fine granular crystal and the does not contain a needle crystal or columnar crystal.

Abstract: A method for racemizing an optically active amino acid, which comprises heating the optically active amino acid in an aqueous solution under an alkaline condition in the presence of an alkali metal salt.

Abstract: A separator (1; 51) including a solution reservoir (3; 53) having a solution chamber (3a; 53a) for putting therein a solution, a membrane support base (4; 54) joined to the solution reservoir, an ultrafiltration-oriented filtering membrane (5; 55) held between the solution reservoir and the support base, and a filtrate cup (2) attached to the support base, in which the solution reservoir and the support base are each respectively made of a thermoplastic material, wherein the solution reservoir is ultrasonically welded to the support base at a part (3b; 53b) thereof spaced apart by a predetermined distance (l.sub.1 ; l.sub.2) from the filtering membrane.

Abstract: A method for recovering acids from an aqueous solution of a mixture of the acids and metal salts by dialysis, characterized in that a fluorinated anion exchange membrane made of a copolymer having repeating units of the formula: ##STR1## wherein X is F or CF.sub.3, l is an integer of from 0 to 5, m is 0 or 1, n is an integer of from 1 to 5, p/q is from 2 to 16, and Y is a quaternary ammonium group, is used as a dialysis membrane.

Abstract: A process for recovering brominated acenaphthylene and its condensate in the form of powder, comprising dropping a solution of brominated acenaphthylene and its condensate produced from acenaphthene by reactions of bromination, condensation and dehydrobromination into hot water containing a carboxylic acid ester of polyoxyalkylene sorbitan, while the solvent is being distilled off, to recover the brominated acenaphthylene and its condensate in the form of powder dispersed in water.

Abstract: A zirconia sintered body comprising zirconia (ZrO.sub.2), yttria (Y.sub.2 O.sub.3) and titania (TiO.sub.2) [Y.sub.2 O.sub.3 /ZrO.sub.2 =at least 2/98 by mole and TiO.sub.2 /(ZrO.sub.2 +Y.sub.2 O.sub.3)=3/97 to 20/80 by mole] has a high translucence giving improved light transmittance. A zirconia sintered body comprising, in addition to ZrO.sub.2, Y.sub.2 O.sub.3 and TiO.sub.2, 0.1 to 3 mole % of an oxide of a rare earth element of the lanthanum group has a fluorescence-radiating property as well as a high translucence.

Abstract: An elongate cylindrical column body has a flange at an open end and an annular extension extending beyond the flange in a direction of the length of the column body. The cover has a seal ring fitted therein for supporting a partition member. The seal ring is sized and shaped so that when the cover is placed on the open end of the column body, the seal ring and a guide face defined by the annular extension sealingly overlap one another by a predetermined length. Bolts passing through the flanges of the column body and cover are used to lock the cover onto the column body.