Keiji Sakamoto
Keiji Sakamoto, Takaoka JP
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20090137012 | Process for producing lactonase and utilitzation thereof - It has been required to economically produce a large amount of optically active γ-lactone derivatives (for example, pantolactone), which are useful as intermediates in synthesizing useful substances such as pharmaceutical drugs. To achieve this object, it is advantageous to employ an enzymatic technique of asymmetric hydrolysis with a hydrolyzing enzyme lactonase. However, it remains troublesome to prepare the enzyme or utilize a microorganism capable of producing the enzyme. Also, it is difficult to obtain a sufficient and stable enzymatic activity in the case of using recombination techniques. In producing lactonase, which asymmetrically hydrolyzes a γ-lactone derivative such as racemic pantolactone selectively, by a recombination technique, both mature lactonase DNA and signal peptide region DNA are transferred into a host. Thus, a stable lactonase activity comparable to naturally-occurring one can be achieved and a transformant sustaining a high enzyme activity in a stable manner can be acquired, thereby allowing the efficient and industrially advantageous asymmetric synthesis of γ-lactone derivatives. | 05-28-2009 |
Keiji Sakamoto, Tokushima-Shi JP
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20090137098 | Method of manufacturing semiconductor element - A step of forming a first auxiliary groove in a semiconductor element structure provided on a semiconductor substrate, a step of forming a second auxiliary groove in the semiconductor element structure, and a step of dividing the semiconductor substrate and the semiconductor element structure in a direction along the first auxiliary groove and the second auxiliary groove are provided, and in the dividing direction, a plurality of the second auxiliary grooves are arranged spaced apart from each other, and at least two first auxiliary grooves are arranged spaced apart from each other between at least a pair of adjacent second auxiliary grooves, and in the dividing step, a separation region interposed between the two first auxiliary grooves is divided, so as to improve such accuracy and suppress the problems such as a damage of the end surface due to cleavage of the substrate. | 05-28-2009 |
Keiji Sakamoto, Takaoka-Shi JP
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20090117064 | STABLE VITAMIN B6 DERIVATIVE - A compound represented by the following general formula (I) or a salt thereof: | 05-07-2009 |
Keiji Sakamoto, Toyama JP
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20080311636 | Method for Producing Optically Active Alpha-Hydroxycarboxylic Acid - An efficient method for producing an optically active α-hydroxycarboxylic acid represented by the following general formula (I) [A represents a residue of a 5- or 6-membered cyclic compound, * indicates a carbon atom in the S- or R-configuration, X represents hydrogen atom or an alkyl group having 1 to 4 carbon atoms], which comprises the step of treating a corresponding ester compound (not optically pure) with cell bodies or a culture, or a processed product or an extract thereof of a microorganism of the genus | 12-18-2008 |
Keiji Sakamoto, Anan-Shi JP
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20080296609 | Nitride Semiconductor Device Comprising Bonded Substrate and Fabrication Method of the Same - A substrate | 12-04-2008 |
Keiji Sakamoto, Yamagata JP
Keiji Sakamoto, Yamatokoriyama-Shi JP
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20140080647 | TOOTHED BELT - Provided is a toothed belt that has satisfactory durability even under high-temperature and high-load conditions or within an oil or water environment. The toothed belt | 03-20-2014 |
20140287862 | Transmission Belt - The durability of a belt is enhanced by improving the strength of rubber itself while enhancing its peeling strength with respect to a cord, a fabric or a short fiber. A toothed belt ( | 09-25-2014 |
Keiji Sakamoto, Tokyo JP
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20160054521 | OPTICAL SEMICONDUCTOR DEVICE, AND METHOD FOR PRODUCING THE SAME - Disclosed is an optical semiconductor device which can be improved in light shift precision and restrained from undergoing a loss in light transmission. In this device, an inner side-surface of a first optical coupling portion of an optical coupling region and an inner side-surface of a second optical coupling portion of the region are increased in line edge roughness. This manner makes light coupling ease from a first to second optical waveguide. By contrast, the following are decreased in line edge roughness: an outer side-surface of the first optical coupling portion of the optical coupling region; an outer side-surface of the second optical coupling portion of the region; two opposed side-surfaces of a portion of the first optical waveguide, the portion being any portion other than the region; and two opposed side-surfaces of a portion of the second optical waveguide, the portion being any portion other than the region. | 02-25-2016 |
20160056115 | OPTICAL SEMICONDUCTOR DEVICE - A technique is provided which can prevent the quality of an electrical signal from degrading in an optical semiconductor device. | 02-25-2016 |