Akihiko Yamagishi

Enantiomeric enrichment at a microcavity embedded in a modified clay: In-column reactions of a coordinatively unsaturated racemic iridium(III) complex

Akihiko Yamagishi, Kazuyoshi Takimoto, Jun Yoshida, Kyaw Naing et autres

A chiral nanoconfined reaction field was constructed by modifying the interlayer space of a smectite clay mineral with enantiopure tris(1,10-phenanthroline)ruthenium(II) complexes), Δ- or Λ-[Ru(phen)3]2+. A racemic coordinatively unsaturated cyclometalated iridium(III) complex, rac-[Ir(nBuBQ)2Cl] (nBuBQH = 2butylbenzo[h]quinoline), was introduced into a short chromatographic column …

jp, gb, us (code pays fourni par la source)

CCDC 2550337: Experimental Crystal Structure Determination

Risa Ito, Nobuyuki Hara, Kazuyoshi Takimoto, Hisako Sato et autres

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …

CCDC 2550336: Experimental Crystal Structure Determination

Risa Ito, Nobuyuki Hara, Kazuyoshi Takimoto, Hisako Sato et autres

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …

Enhancement of Triplet–Triplet Annihilation Upconversion in Organically Modified Clay Colloids

Risa Ito, Nobuyuki Hara, Kazuyoshi Takimoto, Hisako Sato et autres

Controlling the spatial distribution of energy donors and acceptors within constrained microenvironments remains a fundamental challenge in the development of efficient triplet–triplet annihilation upconversion (TTA-UC) and advanced photofunctional materials. Herein, we report the rational modulation of TTA-UC in an R-limonene-swollen organoclay (Sumecton-SAN) …

Protein organization of a single microtrichium in the left and right hindwings of a European hornet via high-resolution microscopic infrared spectroscopy

Hisako Sato, Kazuhiko Abe, S. Inoue, Akihiko Yamagishi

Abstract A single helicoidal microtrichium (approximately 10 µm in diameter and 100 µm in length) located at the edge of a European hornet hindwing was studied by using microscopic infrared spectroscopy, leading to the conclusion that it contained proteins in the β-sheet …

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Protein structures identified in a helicoidal microtrichium of a European hornet hindwing via high-resolution microscopic infrared spectroscopy

Hisako Sato, S. Inoue, Akihiko Yamagishi

Protein secondary structures consisting of a hybrid of α-helices and β-sheets were identified from the microscopic infrared spectra of a single helicoidal microtrichium (approximately 10 µm in diameter and 100 µm in length) at the edge of a European hornet hindwing.

jp, gb, mx (code pays fourni par la source)

Clay column chromatography for optical resolution: separation and asymmetric induction of cyclometalated iridium(III) complexes

Akihiko Yamagishi, Kazuyoshi Takimoto, Kyaw Naing, Kenji Tamura et autres

Abstract Chromatographic separation was attempted by eluting iridium(III) complexes on a high-performance liquid chromatography (HPLC) column packed with an ion-exchange adduct of synthetic hectorite and Δ-tris(1,10-phenanthroline)ruthenium(II). Affinity was adjusted by altering the loading of Δ-[Ru(phen)₃]²⁺ in the hectorite. Seven kinds of neutral …

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Triplet-triplet annihilation up-conversion of cationic iridium(III) complex solubilized by organically-modified hectorite in a green solvent

Akihiko Yamagishi, Kazuyoshi Takimoto, Jun Yoshida, Hisako Sato

jp (code pays fourni par la source)

Mineralogy of terminal grains recovered from the Tanpopo capture panel onboard the International Space Station

Taka-aki K. Noguchi, Akira Miyake, Hikaru Yabuta, Yoko Kebukawa et autres

Abstract The Tanpopo experiment is Japan's first astrobiology mission aboard the Japanese Experiment Module Exposed Facility on the International Space Station. The Tanpopo‐1 mission exposed silica aerogel panels to low Earth orbit from 2015 to 2016 to capture micrometeoroids. We identified an …

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Left–right asymmetry in the microstructure of the hindwings of European hornet revealed by scanning electron microscopy and microscopic vibrational circular dichroism

S. Inoue, Hisako Sato, Akihiko Yamagishi

), one possibility is proposed that the handedness in the hairs on the left and right hindwings is related to the opposite chirality of the protein structure. The correlation between organ-level enantiomeric relationships and the protein secondary structure observed here is a …

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Development of an Experimental System for Hypervelocity Impact Sterilization Tests

Takashi Ozawa, Satoshi Nomura, Sho Iwabuchi, Junko Arikawa et autres

Abstract The assessment of potential microbial contamination on Martian-moon surface is important from the view of planetary protection for the Martian Moon Exploration (MMX) mission. In order to estimate the probability finding the living microorganisms on the Martian moons, hypervelocity impact sterilization …

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Microbial Setups for Hypervelocity Impact Sterilization Tests

Sho Iwabuchi, Kotone Miyajima, Junko Arikawa, Takashi Ozawa et autres

Abstract The Japan Aerospace Exploration Agency (JAXA) plans to conduct the Martian Moon Exploration (MMX) mission, which aims to return samples from Phobos. Estimation of the potential microbial abundance on Phobos is crucial for the MMX mission in terms of planetary protection. …

jp (code pays fourni par la source)