摘要:
A device and method for detecting feature points of an object from an image. A three-dimensional model is created in which a plurality of nodes corresponding to feature points in a learning image are defined. The model is projected onto an input image and a feature value is derived from a plurality of sampling points around a projection point of each node. An error estimated amount is computed based on the displacement of a feature point between a correct model and an error model. The three dimensional position of each feature point in the input image is estimated based on the error estimated amount and a three dimensional model.
摘要:
The present invention provides a method for conveniently obtaining a biodegradable polyhydroxyalkanoate by a solvent extraction method. A method for producing a polyhydroxyalkanoate crystal comprises precipitating a polyhydroxyalkanoate crystal using a monohydric alcohol having 4 to 10 carbon atoms as a extraction solvent, keeping a polyhydroxyalkanoate solution containing 0.1 to 10% by weight of water relative to the total amount of the solution warm at 70° C. or higher, and cooling the solution to below 70° C.
摘要:
A nitrous acid salt is added at a temperature of 10 to 80° C. to an aqueous solution which contains an optically active 2-aminocarboxylic acid (4) and a protonic acid, the amount of the latter acid being 1 to 3 equivalents to the former, and which has a proton concentration of 0.5 to 2 mol/kg to conduct a reaction to thereby produce an optically active 2-hydroxycarboxylic acid (1). Thionyl chloride and a basic compound are caused to act on the compound (1) to chlorinate it and simultaneously invert the configuration in the 2-position. Thus, an optically active 2-chlorocarboxylic acid chloride (5) is induced. The compound (5) is hydrolyzed to induce an optically active 2-chlorocarboxylic acid (2). The compound (2) is reacted with a thioacetic acid salt to incorporate an acetylthio group thereinto and simultaneously invert the configuration in the 2-position to thereby produce an optically active 2-acetylthiocarboxylic acid (3).
摘要:
The present invention provides a process for simply producing an optically active 2-thiomethyl-3-phenylpropionic acid derivative useful as an intermediate for medicines from inexpensive raw materials. An optically active 2-hydroxymethyl-3-phenylpropionic acid ester derivative which can be relatively easily obtained by asymmetric reduction reaction with an enzyme is cyclized to an optically active P-lactone derivative which is then reacted with a sulfur compound to produce an optically active 2-thiomethyl-3-phenylpropionic acid derivative in high yield.
摘要:
The present invention provides a method for obtaining a biodegradable polyhydroxyalkanoate by a solvent extraction method without causing a significant molecular weight decrease. The present invention relates to a method for producing a polyhydroxyalkanoate which comprises extracting a polyhydroxyalkanoate from a polyhydroxyalkanoate-containing biomass having the water content of 5% by weight or less using an extraction solvent, crystallizing, and recovering the resultant.
摘要:
There is provided a process for preparing a pharmacologically acceptable salt of N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-amino acid which comprises condensing an amino acid and N-(1(S) -ethoxycarbonyl-3-phenylpropyl)-L-alanine N-carboxy-anhydride under basic condition, carrying out decarboxylation under between neutral and acidic condition to obtain N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-amino acid, and forming a pharmacologically acceptable salt thereof, wherein the production of a by-product (3): is suppressed by carrying out in an aqueous liquid a series of operations till formation of the pharmacologically acceptable salt or till isolation of the pharmacologically acceptable salt. The present invention enables to prepare the pharmacologically acceptable salt of N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-amino acid having high quality, in a commercial scale with high yield and economical efficiency.
摘要:
A process for producing captopril of the following formula (1) comprising subjecting a substrate compound of the following general formula (2) to a hydrolysis reaction in aqueous medium to remove the RCO group and isolating the product compound, said hydrolysis reaction in aqueous medium being conducted in the presence of a strong acid at pH not over 1 and a reaction temperature not below 40° C.
摘要:
A highly convenient and efficient process for economically producing in a high yield high-quality captopril which is remarkably reduced in the content of impurities and has a high melting point and intermediates for synthesizing the same which contain only a small amount of precursors as impurities and have excellent qualities. The process comprises subjecting an acid halide and an L-proline to the Schotten-Baumann reaction and eliminating the impurities formed as the by-products in the form of the precursors represented by general formula (5) or (6) by treating, during or after the Schotten-Baumann reaction, the aqueous medium solution with active carbon or crystallization followed by deacylation. In the formula, R.sup.1 represents acyl and n represents an integer of from 2 to 4. ##STR1##
摘要:
In a method of increasing the sensitivity of a photosensitive member for inputting digital light, the photosensitive member is prepared to have a steep variation in the value of .gamma. of a latent image formed on the photosensitive member. Digital light and another light are applied to the photosensitive member at substantially the same time. The other light is emitted by an incandescent light, a LED or a fluorescent lamp.
摘要:
In an electronic copier provided with a light-sensitive medium, a charging station, an exposure station, a developing station, a transfer station and a fixing unit, the charging station includes a plurality of contact charging elements in contact with the light-sensitive medium and a voltage supply means for applying voltages to the contact charging elements. A voltage continuously rising in a predetermined period of time is supplied from the voltage supply means to the contact charging elements with the rotation of light-sensitive medium, and the light-sensitive medium is thus uniformly charged.