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材料科学与工程（中英文B版） 2017年第2期7卷 49-62页

作者： Weixin Fu akitsu shigetou Shuichi Shoji Jun Mizuno Department of Nanoscience and Nanoengineering Waseda University 3-4-1 Okubo Shinjuku-ku Tokyo 169-8555 Japan National Institute for Material Science OVIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan Institute for Nanoscience and Nanotechnology Waseda University 513 Tsurumaki-cho Shinjuku-ku Tokyo 162-0041 Japan

Preliminary Investigation of Copper(II) Ion Binding or Complex Coordination in Lysozeme Molecules

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Journal of Materials Science and Chemical Engineering 2024年第4期12卷 98-103页

作者： Kou Takahashi Ryotaro Miyazaki Daisuke Nakane Temitayo O. Aiyelabola Takashiro akitsu Department of Chemistry Faculty of Science Tokyo University of Science Tokyo Japan Department of Chemistry Faculty of Science Obafemi Awolowo University Ile-Ife Nigeria

Hydrophobic Val derivative Schiff base copper(II) complexes and dipeptide (AlaAla, GlyGly) derivative Schiff base copper(II) complexes were introduced into egg white lysozyme. X-ray crystal structure analysis revealed amino acid derivative Schiff base copper(II) complexes were obtained. Herein we discuss primarily on the binding mode of copper(II) of the complexes obtained with egg white lysozyme. The electron density of copper(II) ions was confirmed by X-ray crystal structure analysis. The Val derivative Schiff base copper(II) complex was weakly bound at Arg114 of egg white lysozyme. In other copper(II) complexes, binding of copper(II) ions with dissociated ligands to various residues was observed. The binding sites of copper(II) ions were compared with computational scientific predictions.

关键词： Copper Schiff Base Lysozyme Metal-Protein Binding Computational Methods

Hirshfeld Surface Analysis for Investigation of Intermolecular Interaction of Molecular Crystals

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International Journal of Organic Chemistry 2023年第2期13卷 57-85页

作者： Shintaro Suda Atsunobu Tateno Daisuke Nakane Takashiro akitsu Department of Chemistry Faculty of Science Tokyo University of Science Tokyo Japan

Hirshfeld surface analysis has been widely used in recent years as a means to quantify and visualize various types of intermolecular interactions in molecular crystals. This review article introduces intermolecular interactions discussed with Hirshfeld surface analysis and 2D fingerprint plots. In addition, using CIF files obtained from our previous results, Hirshfeld surface analysis was newly performed, and the resulting 3DHirshfeld surfaces, 2D print plots, molecular structural features, and crystal structure relationships were described. Classification of their intermolecular interactions, statistical discussion focused on crystalline water and perspective on ligand-protein docking are also mentioned.

关键词： Chemical Crystallography Cambridge Structure Database CIF Hirshfeld Surface Analysis Schiff Base

Coordination and Photoisomerization of Azobenzene-Amino Acid Schiff Base Copper(II) Complexes to Lysozyme

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Journal of Materials Science and Chemical Engineering 2023年第3期11卷 34-44页

作者： Yuto Kuroda Ryotaro Miyazaki Daiki Shimonishi Daisuke Nakane Takashiro akitsu Department of Chemistry Faculty of Science Tokyo University of Science Tokyo Japan

In this study, we exhibited an amino acid (arginine and threonine) derivative Schiff base copper(II) complexes incorporating an azobenzene moiety as a photoresponsive site and conjugated it to egg white lysozyme, a well-known protein, to change ligand conformation under binding to lysozyme. Among several spectroscopic investigations, ESR clearly showed that the nitrogen atom of the amino acid residue of lysozyme was bound to the paramagnetic copper(II) ion of the complex, and UV light irradiation confirmed photoisomerization of the azobenzene moiety of the ligand to cis-form. The binding mode was considered by means of spectroscopic as well as computational methods, whereas complete crystallographic verification was still a preliminary stage.

关键词： Azobenzene Schiff Base Copper Amino Acid Lysozyme Artificial Metalloprotein

Degradation of dibromophenols by UV irradiation

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Journal of Environmental Sciences 2014年第6期26卷 1284-1288页

作者： Keiko Katayama-Hirayama Naoki Toda Akihiko Tauchi Atsushi Fujioka Tetsuya akitsu Hidehiro Kaneko Kimiaki Hirayama Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi 4-3-11 Takeda Kofu 400-8511 Japan Technology Development Division Toshiba Lighting and Technology Corporation Asahimachi 5-2-1 Imabari Ehime 794-8510 Japan

We examined the degradation of dibromophenols （DBPs）, i.e. 2,4-DBP, 2,6-DBP and 3,5-DBP by ultraviolet （UV） irradiation and estimated the relationship between degradability and molecular orbital properties of each dibromopbenol. The removal of DBPs under a UV lamp system was successfully performed in an aqueous solution. After 5 min of irradiation, the initial DBPs concentration of 20 mg/L was decreased to below 1 mg/L, and about 60% of bromide ion was released. A decrease in the concentration of dissolved organic carbon （DOC） suggested the mineralization of DBPs, The mineralization may occur after release of bromide ions because the decrease of DOC was slower than the release of bromide ions. The degradability of 3,5-DBP was slightly lower than 2,6-DBP and 2,4-DBE Molecular orbital calculation suggested that the electrophilic frontier density and the highest occupied molecular orbital （HOMO） energy may be related to the degradability of DBPs.

关键词： bromide ion dibromophenol DOC mineralization UV irration

Anisotropic Lattice Strain of Composite Materials of LiMnO2 and H/D-Substituted Chiral Cyanide-Bridged Ni（Ⅱ）-Fe（Ⅲ） Coordination Polymers

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化学与化工：英文版 2014年第6期8卷 557-563页

作者： Masaki Kobayashi Takashiro akitsu Department of Chemistry Faculty of Science Tokyo University of Science Tokyo 162-8601 Japan

Simultaneous Multimode Oscillation of Stress-Compensated Cut Quartz Resonator with Narrow-Band Wide Variable-Range Quartz Crystal Oscillator

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Engineering（科研） 2014年第13期6卷 973-988页

作者： Tomio Sato Tetsuya akitsu Division of Human Environmental and Medical Engineering Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi Kofu Japan

A multimode-quartz-crystal oscillator was developed to excite stable dual-mode resonance at different frequencies: The oscillation of the 3rd harmonic resonance of the principle C-mode and an additional resonance B-mode of SC-cut crystal. Harmonic combinations of the 3rd and fundamental mode of B-mode with the 3rd harmonics of C-mode are demonstrated. The measurement of the temperature dependence of the oscillation frequency is demonstrated along with the stability determined by root Allan variance. Dependence on the open conductance of the active circuit and the dependence on the coupling capacitors are discussed.

关键词： Temperature Sensing Piezoelectric Sensor Dual-Mode Quartz Crystal Resonance Stress-Compensated Cut (SC-Cut)

Anthraquinone Derivative Chiral Schiff Base Copper（Ⅱ） Complexes for Enzyme Type Bio-Fuel Cell Mediators

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Journal of Electrical Engineering 2016年第4期4卷 189-195页

作者： Yuto Takeuchi Takashiro akitsu Department of Chemistry Faculty of Science Tokyo University of Science Tokyo 162-8601 Japan

Material Conformity and Bactericidal Characteristics of High-Density Ozone Disinfection in Vinyl Polysiloxane Impression and PMMA Dentistry Fillings

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Engineering（科研） 2014年第7期6卷 319-328页

作者： Hiroshi Ohkawa Tetsuya akitsu Division of Human Environmental and Medical Engineering Interdisciplinary Graduate School of Medicine and Engineering National University of Yamanashi Kofu Japan Plasma Division Yamato Science Co. Ltd. Minami-Alps City Japan

Disinfection was investigated in high-density ozone produced by dielectric barrier discharge under atmospheric pressure. Disinfection was studied on three-dimensional carriers made of hydrophilic vinyl-polysiloxane impression material and granular acrylic resin used for oral surgery. Experimental results indicate disinfection of spore-forming bacteria: Geobacillus stearothermophilus and Bacillus atrophaeus, and selected species of opportunistic pathogens: Aspergillus niger, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, and Candida albicans.

关键词： Ozone Disinfection Bacillus atrophaeus Geobacillus stearothermophil Aspergillus niger Pseudomonas aeruginosa Escherichia coli Staphylococcus aureus Candida albicans

Compatibility of the Active Inductance Double Resonance Quartz Oscillator with Q-MEMS Temperature Sensor

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Engineering（科研） 2015年第2期7卷 47-57页

作者： Tetsuya akitsu Akira Kudo Tomio Sato Human Environment and Medical Engineering Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi Takeda 4-3-11 Kofu Japan SEIKO EPSON Corporation Head-Quarter Owa 3-3-5 Suwa Japan

Low-frequency double-resonance quartz crystal oscillator circuit was developed with active inductance aiming the quick start-up in the intermittent operation on the sensor circuit and DC isolation using a Q-MEMS sensing crystal HTS-206. Allan standard deviation indicated 5 × 10–12, showing short range stability of the sensor circuit sufficient for the ubiquitous environmental sen sor network.

关键词： Q-MEMS Sensing Crystal HTS-206 Active Inductance Double Resonance