摘要:
A method for resolving optically impure 3-oxa-2-oxobicyclo�3.1.0!hexane-1-carboxylic acid esters. A method is provided for producing a 1-alkoxycarbonyl-2-hydroxymethylcyclopropane-1-carboxylic acid.N-benzyl-.alpha.-phenylethylamine diastereomer salt. An enantiomer of N-benzyl-.alpha.-phenylethylamine is reacted with a 1-alkoxycarbonyl-2-hydroxymethylcyclopropane-1-carboxylic acid to produce a precipitate that is enriched in one diastereomer of the salt. After isolating the optically active salt, the N-benzyl-.alpha.-phenylethylamine may be separated to produce the corresponding 1-alkoxycarbonyl-2-hydroxymethylcyclopropane-1-carboxylic acid. Under acidic conditions, the carboxylic acid and hydroxyl groups undergo ring closure to afford the optically active 3-oxa-2-oxobicyclo�3.1.0!hexane-1-carboxylic acid ester.
摘要:
A stilbene derivative of the following general formula (I) or a pharmaceutically acceptable acid addition salt thereof have low toxicity, but are water soluble and effective as carcinostatics: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3, which may be the same or different, each represent an alkyl group having 1 to 3 carbon atoms; X represents a hydrogen atom or a nitrile group; Y represents an alkyloxy group having 1 to 3 carbon atoms, an alkyl group having 1 to 6 carbon atoms or a halogen atom.
摘要:
Stilbene compounds of the following formula (I) or their pharmaceutically acceptable salts are effective as carcinostatics and of low toxicity: ##STR1## wherein X represents a hydrogen atom or a nitrile group, and Y represents an amino acid acyl group.
摘要:
A surface of a silicon carbide substrate on which a graphite layer is formed is covered with a metal layer which can form carbide. Then, the silicon carbide substrate is annealed to cause reaction between a metal in the metal layer which can form carbide and carbon in the graphite layer so as to change the graphite layer between the metal layer which can form carbide and the silicon carbide substrate to a metal carbide layer. Thus, the graphite layer is removed. The adhesion between the metal layer which can form carbide and the silicon carbide substrate can be improved so that separation of the metal layer which can form carbide can be suppressed. Graphite deposits can be suppressed due to the removal of the graphite layer so that separation of a wiring metal film formed on a surface of the metal layer which can form carbide can be suppressed.
摘要:
A method for producing a tooth having a desired length in one direction includes the steps of: placing a first cell aggregate and a second cell aggregate in the inside of a support while bringing the first and the second cell aggregates into close contact with each other; and culturing the first and the second cell aggregates in the inside of the support, in which the first cell aggregate is composed of one of mesenchymal cells or epithelial cells and the second cell aggregate is composed of the other, and the size of the tooth is controlled by adjusting the length of contact between the first cell aggregate and the second cell aggregate in one direction.
摘要:
A surface of a silicon carbide substrate on which a graphite layer is formed is covered with a metal layer which can form carbide. Then, the silicon carbide substrate is annealed to cause reaction between a metal in the metal layer which can form carbide and carbon in the graphite layer so as to change the graphite layer between the metal layer which can form carbide and the silicon carbide substrate to a metal carbide layer. Thus, the graphite layer is removed. The adhesion between the metal layer which can form carbide and the silicon carbide substrate can be improved so that separation of the metal layer which can form carbide can be suppressed. Graphite deposits can be suppressed due to the removal of the graphite layer so that separation of a wiring metal film formed on a surface of the metal layer which can form carbide can be suppressed.
摘要:
A main object of the present invention is to provide a novel pyridine derivative represented by the following general formula [1] or a pharmaceutically acceptable salt thereof. In formula [1], R represents an aryl group or a heteroaryl group, which may be substituted by an optionally substituted alkyl group, a hydroxy group, a halogen atom or a group represented by general formula [2]. In formula [2], -L1-L2-L3-RA [2] L1 and L3 independently represent a single bond, an alkylene group or a cycloalkylene group; L2 represents a single bond, O, or NRB; RB represents H or an optionally substituted alkyl group; and RA represents B, an amino group, a cyano group, a hydroxy group, an alkoxy group, an aryl group, a monoalkylamino group, a dialkylamino group, a carbamoyl group, an alkyloxycarbonyl group, a monoalkylaminocarbonyl group, a dialkylaminocarbonyl group, an alkylcarbonylamino group, and a saturated heterocyclic group, among other groups.
摘要:
The present invention relates to an oligosaccharide chain added GLP-1 peptide that has higher stability in blood than that of GLP-1 and, preferably, exhibits higher activity of controlling blood-sugar levels than that of GLP-1. The present invention relates to an oligosaccharide chain added GLP-1 peptide having GLP-1 activity, wherein at least one amino acid is substituted with an oligosaccharide chain added amino acid, in: (a) GLP-1; (b) a peptide having the amino acid sequence of GLP-1 with deletion, substitution or addition of one or several amino acids; or (c) a GLP-1 analog.
摘要:
A method for manufacturing a regenerated tooth unit comprising a step of disposing and culturing a regenerated tooth germ inside a spacer in vivo in the body of a mammal is provided, wherein said spacer is configured so as to enable prevention of said regenerated tooth germ being extended to more than the maximum tolerance; and configured such that the regenerated tooth germ disposed inside is communicatable with the exterior of the spacer.
摘要:
A method of producing a restorative material used to restore a tooth-deficient area in an oral cavity, the method comprising: positioning, in a support carrier, a first cell mass formed from either mesenchymal cells or epithelial cells and a second cell mass formed from the other of the mesenchymal cells or epithelial cells, one of the mesenchymal cells or epithelial cells being derived from a tooth germ and the first and second cell masses being not mixed with each other but made to closely contact each other; culturing the first and second cell masses to form a reconstructed tooth germ or tooth; and confirming directionality of the reconstructed tooth germ or tooth formed by the culturing so as to enable the reconstructed tooth germ or tooth to be embedded in the tooth-deficient area such that a tip of the tooth faces an interior of the oral cavity, the tooth germ or tooth whose directionality has been confirmed being used as a restorative material to obtain an equivalent of a missing tooth in the tooth-deficient area. A method for restoring a tooth-deficient area, the method comprising; embedding the reconstructed tooth germ or tooth obtained by the production method in the tooth-deficient area.