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Browsing 物質創成科学研究科 / Graduate School of Materials Science by Submit Date

Browsing 物質創成科学研究科 / Graduate School of Materials Science by Submit Date

Now showing items 1-20 of 144

Comprehensive reaction mechanisms at and near the Ni–Fe active sites of [NiFe] hydrogenases

Tai, Hulin; Higuchi, Yoshiki; Hirota, Shun (Royal Society of Chemistry, 2018)

[NiFe] hydrogenase (H2ase) catalyzes the oxidation of dihydrogen to two protons and two electrons and/or its reverse reaction. For this simple reaction, the enzyme has developed a sophisticated but intricate mechanism with ...
Design of artificial metalloproteins/metalloenzymes by tuning noncovalent interactions

Hirota, Shun; Lin, Ying-Wu (Springer Berlin Heidelberg, 2018-01)

Noncovalent weak interactions [hydrophobic interaction and hydrogen (H)-bond] play crucial roles in controlling the functions of biomolecules, and thus have been used to design artificial metalloproteins/metalloenzymes ...
Equilibrium between inactive ready Ni-SIr and active Ni-SIa states of [NiFe] hydrogenase studied by utilizing Ni-SIr-to-Ni-SIa photoactivation†

Tai, Hulin; Xu, Liyang; Nishikawa, Koji; Higuchi, Yoshiki; Hirota, Shun (Royal Society of Chemistry, 2017-09-19)

Previously, the Ni-SIr state of [NiFe] hydrogenase was found to convert to the Ni-SIa state by light irradiation. Herein, large activation energies and a large kinetic isotope effect were obtained for the reconversion of ...
Rational Design of Domain‐Swapping‐Based c‐Type Cytochrome Heterodimers by Using Chimeric Proteins

Zhang, Mohan; Nakanishi, Tsukasa; Yamanaka, Masaru; Nagao, Satoshi; Yanagisawa, Sachiko; Shomura, Yasuhito; Shibata, Naoki; Ogura, Takashi; Higuchi, Yoshiki; Hirota, Shun (Wiley Online Library, 2017-09-05)

Swap shop: A new methodology is applied in the construction of c‐type cytochrome (cyt) heterodimers through the domain swapping of two chimeric proteins, in which the N‐terminal regions of Pseudomonas aeruginosa cyt c551 ...
Cytocompatible polyion complex gel of poly(Pro-Hyp-Gly) for simultaneous rat bone marrow stromal cell encapsulation

Nurlidar, Farah; Kobayashi, Mime; Terada, Kayo; Ando, Tsuyoshi; Tanihara, Masao (Taylor & Francis, 2017-05-28)

Polyion complex (PIC) gel of poly(Pro-Hyp-Gly) was successfully fabricated by simply mixing polyanion and polycation derivatives of poly(Pro-Hyp-Gly), a collagen-like polypeptide. The polyanion, succinylated poly(Pro-Hyp-Gly), ...
Calcium deposition in photocrosslinked poly(Pro-Hyp-Gly) hydrogels encapsulated rat bone marrow stromal cells

Nurlidar, Farah; Yamane, Keisuke; Kobayashi, Mime; Terada, Kayo; Ando, Tsuyoshi; Tanihara, Masao (Wiley-Blackwell, 2017-07-17)

Reproducing the features of the extracellular matrix is important for fabricating three‐dimensional (3D) scaffolds for tissue regeneration. A collagen‐like polypeptide, poly(Pro‐Hyp‐Gly), is a promising material for 3D ...
Quasiclassical Theory on Third-Harmonic Generation in Conventional Superconductors with Paramagnetic Impurities

Jujo, Takanobu (The Physical Society of Japan, 2017-12-27)

We investigate the third-harmonic generation (THG) of s-wave superconductors under microwave pulse irradiation. We consider the effect of paramagnetic impurities on the THG intensity of dirty superconductors. The nonlinear ...
Metamaterials with magnetism and chirality

Tomita, Satoshi; Kurosawa, Hiroyuki; Ueda, Tetsuya; Sawada, Kei (IOP Publishing, 2018-02-06)

This review introduces and overviews electromagnetism in structured metamaterials which undergo simultaneous time-reversal and space-inversion symmetry breaking due to magnetism and chirality. Direct experimental observation ...
Observation of asymmetric electromagnetic field profiles in chiral metamaterials

Hisamoto, Nobuyuki; Ueda, Tetsuya; Sawada, Kei; Tomita, Satoshi (American Physical Society, 2018-02-02)

We experimentally observe asymmetric electromagnetic field profiles along two-dimensional chiral metamaterials. The asymmetric field profiles depending on the chirality and the operation frequency have been reproduced well ...
Studies on Pyrene and Perylene Derivatives upon Oxidation and Application to a Higher Analogue

Matsumoto, Akinobu; Suzuki, Mitsuharu; Hayashi, Hironobu; Kuzuhara, Daiki; Yuasa, Junpei; Kawai, Tsuyoshi; Aratani, Naoki; Yamada, Hiroko (The Chemical Society of Japan, 2017-03-09)

The structure and electronic features of neutral and positively charged pyrene and perylene derivatives were explored. The radical cation of 1,3,6,8-tetraarylpyrene 1 was examined by ESR, UV-vis-NIR spectroscopy and ...
Semiconducting Self-Assembled Nanofibers Prepared from Photostable Octafluorinated Bisanthene Derivatives

Hayashi, Hironobu; Aratani, Naoki; Yamada, Hiroko (Wiley-VCH Verlag, 2017-04-10)

Bisanthene is an important class of small two-dimensional polycyclic aromatic hydrocarbons with a zigzag-edged graphene nanoribbon character. Therefore, the functionalization and deep understanding of the structure-property ...
Dinaphthotetrathiafulvalene Bisimides: A New Member of the Family of π-Extended TTF Stable p-Type Semiconductors

Yamashita, Masataka; Kawano, Koki; Matsumoto, Akinobu; Aratani, Naoki; Hayashi, Hironobu; Suzuki, Mitsuharu; Zhang, Lei; Briseno, Alejandro L.; Yamada, Hiroko (Wiley-VCH Verlag, 2017-07-27)

Air-stable organic semiconductors based on tetrathiafuluvalene (TTF) were developed by synthesising a series of dinaphthotetrathiafulvalene bisimides (DNTTF-Im) using electron-donating TTF, π-extended naphthalene, and ...
Side-chain engineering in a thermal precursor approach for efficient photocurrent generation

Takahashi, Kohtaro; Kumagai, Daichi; Yamada, Naoya; Kuzuhara, Daiki; Yamaguchi, Yuji; Aratani, Naoki; Koganezawa, Tomoyuki; Koshika, Sota; Yoshimoto, Noriyuki; Masuo, Sadahiro; Suzuki, Mitsuharu; Nakayama, Ken-ichi; Yamada, Hiroko (The Royal Society of Chemistry, 2017-06-01)

An ideal active-layer compound for bulk-heterojunction (BHJ) organic photovoltaic devices (OPVs) can assemble upon deposition to form the effective π-π stacking that facilitates exciton diffusion and charge-carrier transport. ...
Contraction of π-Conjugated Rings upon Oxidation from Cyclooctatetraene to Benzene via the Tropylium Cation

Tamoto, Akira; Aratani, Naoki; Yamada, Hiroko (Wiley-VCH Verlag, 2017-10-25)

We have serendipitously discovered a unique transformation of a cyclooctatetraene derivative 1 into a cycloheptatriene spirolactone 3 upon oxidation, which is the first such transformation reported in 60 years. Product 3 ...
Rearrangement of an aniline linked perylene bisimide under acidic conditions and visible to near-infrared emission from the intramolecular charge-transfer state of its fused derivatives

Kojima, Mitsuru; Tamoto, Akira; Aratani, Naoki; Yamada, Hiroko (The Royal Society of Chemistry, 2017-04-18)

We have prepared a series of aniline-linked and fused perylene bisimides (PBIs) for making near-infrared (NIR) fluorophores. During this research, we found an unexpected rearrangement reaction on the PBI core for the first ...
Synthesis, Characterization and Protonation Behavior of Quinoxaline-Fused Porphycenes

Kuzuhara, Daiki; Sakaguchi, Mika; Furukawa, Wataru; Okabe, Takuya; Aratani, Naoki; Yamada, Hiroko (MDPI, 2017-05-31)

9,10-Quinoxaline-fused porphycenes 1a-H2 and 1b-H2 were synthesized by intramolecular McMurry coupling. As a result of the annulation of the quinoxaline moiety on the porphycene skeleton, 1a-H2 and 1b-H2 display absorption ...
Magnetic Properties of Fibonacci-Modulated Fe-Au Multilayer Metamaterials

Suwa, Tomomi; Tomita, Satoshi; Hosoito, Nobuyoshi; Yanagi, Hisao (MDPI AG, 2017-10-20)

Herein we experimentally study magnetic multilayer metamaterials with broken translational symmetry. Epitaxially-grown iron-gold (Fe-Au) multilayers modulated using Fibonacci sequence—referred to as magnetic inverse ...
Microwave analog of Stern-Gerlach effects using nonuniform chiral metamaterials

Tomita, Satoshi; Sawada, Kei; Nagai, Shotaro; Sanada, Atsushi; Hisamoto, Nobuyuki; Ueda, Tetsuya (American Physical Society, 2017-10-13)

This study observes microwave beam splitting dependent on circular polarizations through nonuniform chiral metamaterials. Nonuniform chiral metamaterials with a gradation in refractive index are constructed using chiral ...
Two-Photon Absorption by Impurity Scattering and Amplitude Mode in Conventional Superconductors

Jujo, Takanobu (The Physical Society of Japan, 2015-10-23)

We theoretically investigate the two-photon absorption spectrum of conventional s-wave superconductors. The calculation is carried out in the local limit at absolute zero. The direct excitation of quasiparticles is excluded ...
Damping Rate of Josephson Plasmons by Photoexcited Quasiparticles in Small Tunnel Junctions

Jujo, Takanobu (The Physical Society of Japan, 2014-07-28)

We investigate the quasiparticle excitation by an electromagnetic field in a small tunnel junction and its effect on the damping rate of Josephson plasmons. By the time-dependent path integral method, we formulate the ...

Now showing items 1-20 of 144

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