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356 results on '"Horibe, Hideo"'

4. Synergistic Formation of Radicals by Irradiation with Both Vacuum Ultraviolet and Atomic Hydrogen: A Real-Time In Situ Electron Spin Resonance Study

Author

Ishikawa, Kenji, Sumi, Naoya, Kono, Akihiko, Horibe, Hideo, Takeda, Keigo, Kondo, Hiroki, Sekine, Makoto, and Hori, Masaru

Subjects
Physics - Chemical Physics, Physics - Biological Physics, Quantitative Biology - Quantitative Methods
Abstract

We report on the surface modification of polytetrafluoroethylene (PTFE) as an example of soft- and bio-materials that occur under plasma discharge by kinetics analysis of radical formation using in situ real-time electron spin resonance (ESR) measurements. During irradiation with hydrogen plasma, simultaneous measurements of the gas-phase ESR signals of atomic hydrogen and the carbon dangling bond (C-DB) on PTFE were performed. Dynamic changes of the C-DB density were observed in real time, where the rate of density change was accelerated during initial irradiation and then became constant over time. It is noteworthy that C-DBs were formed synergistically by irradiation with both vacuum ultraviolet (VUV) and atomic hydrogen. The in situ real-time ESR technique is useful to elucidate synergistic roles during plasma surface modification., Comment: 14 pages, 4 figures

Published
2012
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34. Concept model of atomic hydrogen dry developing process for photolithographic patterning

Author

Takemori, Yuki, Gohdo, Masao, Koda, Yuta, Horibe, Hideo, Takemori, Yuki, Gohdo, Masao, Koda, Yuta, and Horibe, Hideo

Abstract

Atomic hydrogen dry etching was used for microstructure fabrication. Photolithography was proposed and achieved by a dry development process using atomic hydrogen irradiation. The reaction system of poly(methyl methacrylate) mixed with molecular benzophenone was examined as a model system for a proof-of-concept study. Optical patterning was experimentally made on a thin layer of poly(methyl methacrylate) with benzophenone by UV light exposure with a photomask. The reaction system acted as a negative tone resist in the proposed process. Thus, a model system for a new atomic hydrogen dry development process was proposed and successfully demonstrated.

Published
2020

35. Effect of pgsE expression on the molecular weight of poly(γ-glutamic acid) in fermentative production

Author

Fujita, Ken-Ichi, Tomiyama, Takashi, Inoi, Takahiro, Nishiyama, Takashi, Sato, Eriko, Horibe, Hideo, Takahashi, Ryosuke, Kitamura, Shinichi, Yamaguchi, Yoshihiro, Ogita, Akira, Tanaka, Toshio, Fujita, Ken-Ichi, Tomiyama, Takashi, Inoi, Takahiro, Nishiyama, Takashi, Sato, Eriko, Horibe, Hideo, Takahashi, Ryosuke, Kitamura, Shinichi, Yamaguchi, Yoshihiro, Ogita, Akira, and Tanaka, Toshio

Abstract

納豆のネバネバの主因であるポリグルタミン酸(PGA)は、枯草菌の一種である納豆菌が分泌生産する高分子です。これまで、PGA生合成に必須なタンパク質は、PGA合成関連pgsオペロンから翻訳されるPgsB、PgsC、およびPgsAと報告されてきました。本研究では、pgsオペロンにおいてpgsAの下流に位置するpgsE遺伝子に着目し、PgsEタンパク質がPGAの生合成に与える影響を動的粘度法や多角度光散乱検出器による分子量解析を通して調べました。その結果、PgsB、PgsC、およびPgsAの3つのタンパク質で生産されたPGAは、ほとんど粘性を示さず、47,000の分子量でした。一方、PgsB、PgsC、PgsA、およびPgsEの4つのタンパク質で生産されたPGAは高粘性を示し、その分子量も2,900,000であることが判明しました。以上の結果より、PgsEは、PGAの分子量を大幅に向上させ、納豆をネバネバにさせる主因である可能性が示唆されました。, Poly(γ-glutamic acid) (PGA) is a biopolymer produced by Bacillus spp. via the γ-amide linkages of D- and/or L-glutamate. Although high-molecular-weight (HMW) PGA possesses many attractive properties, such as flocculating, wound healing, and immune-stimulating effects, no studies have reported factors useful for increasing the molecular weight of PGA during microbial production. PgsB, PgsC, and PgsA are the minimum protein sets required for PGA production in B. subtilis, and PgsE improves PGA productivity. Analysis by size-exclusion chromatography combined with multiangle laser light scattering revealed that the molecular weight of PGA was M_w = 2,900,000 g mol^−1 and predominantly M_w = 47,000 g mol^−1 in preparations derived from B. subtilis cells with and without pgsE, respectively. PgsE may be required to increase the molecular weight of PGA.

Published
2020

36. Thermoresponsive Conductivity of Acrylamide-Based Polymers and Ni Microparticle Composites

Author

Onishi, Hayato, Koda, Yuta, Horibe, Hideo, Onishi, Hayato, Koda, Yuta, and Horibe, Hideo

Abstract

Composite materials with polymers and inorganic fillers enable the preparation of a variety of functional polymer materials. In particular, composites with the crystalline polymers and Ni microparticles (NiMPs) can be applied to the thermoresponsive conductive materials which are called as PTC (positive temperature coeffcient) materials....

Published
2020

38. Enhanced decomposition of toxic pollutants by underwater pulsed discharge in the presence of hydrogen peroxide and microbubbles.

Author

Matsuura, Risako, Kometani, Noritsugu, Horibe, Hideo, and Shirafuji, Tatsuru

Abstract

The decomposition of phenol and 4-chlorophenol by underwater pulsed discharge has been examined. The addition of hydrogen peroxide improved the decomposition rate of phenol by about 2.5 times and that of 4-chlorophenol by about 1.5 times. Analysis using a fluorescent probe suggested that the addition of hydrogen peroxide enhanced the production of hydroxyl radicals by about 3 times. We have also examined the effect of using microbubbles on the decomposition of phenol. The use of only microbubbles resulted in a slight increase of the decomposition rate, while the use of both microbubbles and hydrogen peroxide led to a remarkable enhancement of the decomposition rate by about 3.5 times with the conversion of phenol reaching 70% at discharge time of 3 h, which corresponded to the energy yield of 4.39 × 10â€"9 mol Jâˆ'1. [ABSTRACT FROM AUTHOR]

Published
2022
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46. Thermal Latent Reductants for Controlled Degradation of Polyperoxides and Their Application to High Performance Dismantlable Adhesives

Author

Sato, Eriko, Omori, Chisato, Yuri, Michihiro, Koda, Yuta, Horibe, Hideo, Sato, Eriko, Omori, Chisato, Yuri, Michihiro, Koda, Yuta, and Horibe, Hideo

Abstract

1-Phenyl-3-pyrazolidone (PhP) having an active hydrogen was blocked by phenyl isocyanate derivatives to reduce its nucleophilicity, and the potential of the blocked PhP as a thermal latent reductant generating the organic reducing agent, PhP, was revealed for the first time. The degree of dissociation of the blocked PhP during heating in solution can be controlled by the steric hindrance of the isocyanate-blocking agents....

Published
2019

47. Facile Synthesis of Graft Copolymers Containing Rigid Poly(dialkyl fumarate) Branches by Macromonomer Method

Author

Sato, Eriko, Tamari, Noboru, Horibe, Hideo, Sato, Eriko, Tamari, Noboru, and Horibe, Hideo

Abstract

Graft copolymers show microphase separated structure as seen in block copolymers and have lower intrinsic viscosity than block copolymers because of a branching structure. Therefore, considering molding processability, especially for polymers containing rigid segments, graft copolymers are useful architectures. In this work, graft copolymers containing rigid poly(diisopropyl fumarate) (PDiPF) branches were synthesized by full free radical polymerization process....

Published
2019

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