Abstract:
This invention provides a process for producing optically active 2-[6-(hydroxymethyl)-1,3-dioxan-4-yl]acetic acid derivatives, which are of value as intermediates of drugs, from inexpensive starting materials without using any special equipment such as that required for super-low temperature reactions.A process for producing optically active 2-[6-(hydroxymethyl)-1,3-dioxan-4-yl]acetic acid derivatives which comprises reacting an acetic acid derivative at a temperature of not less than −30° C. with an enolate prepared by permitting either a base or a metal having a valency of 0 to act on the derivative to produce a hydroxyoxohexanoic acid derivative, reducing this compound with the aid of a strain of microorganism to provide a halomethyldioxanylacetic acid derivative, treating this compound with an acetalizing agent in the presence of an acid catalyst to provide a halomethyl-dioxanylacetic acid derivative, reacted with an acyloxylating agent to provide a acyloxymethyldioxanylacetic acid derivative, and subjecting this compound to solvolysis in the presence of a base.
Abstract:
A method for mounting electronic elements, comprises the step of arranging a thermosetting adhesive between a circuit board, situated on a stage, and an electronic element to be connected with the wiring pattern of the circuit board, and then bonding the electronic element to the circuit board by the application of heat and pressure from the electronic element side. The electronic element is temporarily thermocompression-bonded to the circuit board such that the thermosetting reaction rate of the thermosetting adhesive on the side of the circuit board is lower than the thermosetting reaction rate on the side of the electronic element. The thermosetting adhesive is then set finally in order to bond the electronic element to the circuit board.
Abstract:
Relating to an enzyme capable of efficiently converting a ketone compound to an optically active amino compound by transamination, and a process for preparing an optically active amino compound using the enzyme. An (S)-&agr;-phenethylamine:pyruvate transaminase, which acts on (S)-&agr;-phenethylamine and a ketone compound, thereby catalyzing transamination for forming acetophenone and an amino compound corresponding to the ketone compound; a process for preparing an optically active amino compound using the transaminase; and a method for culturing a microorganism for producing the above transaminase, comprising adding to a medium one or more compounds selected from the group consisting of propylamine, 1-butylamine, 2-butylamine, 2-pentylamine, isopropylamine and isobutylamine as an inducer for the enzyme when a microorganism for producing (S)-&agr;-phenethylamine:pyruvate transaminase is cultured.
Abstract:
A PTC-element to be used as a protective device against overcurrent or overvoltage, of which the volume resistivity does not substantially differ before and after a high temperature processing, such as reflowing of solder, and can be preserved even after having been subjected to repeated tripping, which contains a non-conductive crystalline polymer and a particulate conductor material dispersed in the non-conducting crystalline polymer, wherein the particulate conductor material includes electro-conductive particles having irregular surface contours.
Abstract:
In a process for the production of a D-.alpha.-amino acid, in which an N-carbamyl-D-.alpha.-amino acid corresponding to the general formula: ##STR1## wherein R represents phenyl, hydroxy-substituted phenyl, substituted or unsubstituted alkyl, or thienyl, is converted by a microbial enzyme in an aqueous medium to a D-.alpha.-amino acid corresponding to the general formula: ##STR2## wherein R is the same as defined above, decarbamylase produced by a microorganism of the genus Comamonas, Blastobacter, Alcaligenes, Sporosarcina, Rhizobium, Bradyrhizobium or Arthrobacter is used as the enzyme converting the N-carbamyl-D-.alpha.-amino acid to the D-.alpha.-amino acid.The conversion of the N-carbamyl-D-.alpha.-amino acids to the D-.alpha.-amino acids is carried out in a neutral to alkaline pH range.
Abstract:
A metal roof board connecting structure for connecting metal roof boards includes a raised-up flat lock seam portion formed by bending flatly and seamly raised-up regions of two metal roof boards which are arranged adjacently to each other, and a cap member capped on the raised-up flat lock seam portion. A part of the raised-up region of one of the two metal roof boards forms a first cap engaging projection and a bent portion of the raised-up flat lock seam portion forms a second cap engaging projection so as to be arranged in symmetrical with the first projection. The cap member has a two elastic side walls a center portion of each of which has an engaging recess and a lower end portion of each of which is extended downwardly and outwardly to extend away from each other. When the cap member is capped on the raised-up flat lock seam portion, the engaging recesses of the two side walls of the cap member are engaged with the first and second cap engaging projections of the one raised-up region and the raised-up flat lock seam portion of the two metal roof boards, and that engagement is semipermanently secured by the elastic force of the two side walls of the cap member.
Abstract:
This invention provides a thermocompression bonding equipment which, when the material to be bonded is to be changed, allows easy replacement and preparation of a compression bonding head, reduction of working time required for replacement and preparation of a compression bonding head, and simplified adjustment of the compression bonding head. The thermocompression bonding equipment is provided with a head unit 20 comprising a base 10, thermocompression bonding head 56 and sliding mechanism 50 for sliding the thermocompression bonding head 56 provided on the base 10, pressing means 30, which are structured independently from the head unit, for pressing the sliding mechanism 50 to slide the thermocompression bonding head 56, thereby thermocompression bonding the material of ACF, LCD, and TAB, and a base frame 40 provided with positioning means 40, 41 for positioning the base 10.
Abstract:
A thermocompression bonding apparatus wherein object parts can be connected with a high degree of accuracy by thermocompression bonding and the entire apparatus is not deformed readily by a high pressure and a member of a large size can be connected at a fine pitch with a high degree of accuracy. The thermocompression bonding apparatus is constructed so as to bond a first member to a second member by thermocompression bonding and comprises a base member, a holding device for holding the second member thereon, a heat generation element for applying heat to the first member, and a pressurization member for pressing the heat generation element against the first member and the second member. The holding device, the heat generation element and the pressurization member are disposed mechanically separately from the base member. Also a thermocompression bonding method and a process of manufacturing a liquid crystal display device which are performed using the thermocompression bonding apparatus are disclosed.
Abstract:
An adapter pack is constructed so that it can be connected to a video camera via the site via which the battery pack is normally connected. The adapter pack is itself provided with a mounting site on which the battery pack can be connected. This construction allows the adapter pack to be operatively "sandwiched" between the battery pack and the camera. The adapter pack is arranged to permit the power from the battery pack to be supplied both to its own circuitry and therethrough to the camera.
Abstract:
A container of substantially rectangular cross section is formed of synthetic resin and comprises a container body and a lid member to be detachably mounted to the container body. The container body is provided with longitudinal and lateral side walls and a bottom wall and is capable of being molded as a single piece and thereafter foldable into a container. A locking device for locking the container body and the lid member is located on an outer surface of a side wall of the container body and on a corresponding inner surface of a side wall of the lid. The locking member comprises projections extending outwardly from outer surfaces of the lateral side walls of the container body and corresponding recesses extending inwardly from inner surfaces of the lateral side walls of the lid member. A pair of the longitudinal side walls of the lid member are provided with projected portions formed on upper edges thereof and with recessed portions formed on lower edges thereof, wherein each recessed portion formed so as to have an inner shape corresponding to an outer shape of each projected portion. Projecting pieces are formed on the inner surfaces of the lateral side walls of the container body for abutting against and supportably fixing the contents, which have an outer perimeter surface area smaller than a surface area of the bottom wall of the container body.