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P-28 Takashi Nagata
photopigment“A novel type of opsin with optogenetic potential: Animal opsin-based
as a potential dark-active and light-inactivated G protein-coupled receptor”

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expressing “bistable” and “bleaching” opsins using transgenic zebrafish”

P-30 Masaki Mizutani“Gliding ghost of Mycoplasma gallisepticum”

P-31 Toshiaki Arata“Structural dynamics of epi-genome related heterochromatin protein HP1 studiedby spin labeling ESR spectroscopy”

P-32 Daiki Matsuike“Two different conformations of Gli123 protein, essential for Mycoplasma mobilegliding”

P-33 Takuma Toyonaga “Structure of motor evolved by combination of ATP synthase and phosphoglycerate
kinase for Mycoplasma mobile gliding”
P-34 Yuya Sasajima“Internal Ribbon Structure Driving Helicity-Switching Swimming in Spiroplasma”

P-35 Daichi Takahashi“Dynamics and Structure of MreB proteins from Spiroplasma eriocheiris”

P-36 Hana Kiyama“Reproduction of Spiroplasma swimming motility using synthetic bacteria andelucidation of its mechanism”

P-37 Maya Nakatani“Structural and functional analysis of fatty acid kinase of T. thermophilus HB8”

P-38 Yuhei Tahara“Application to microbial surface structure observation of Quick-Freeze and DeepEtch (QFDE) replica microscopy”

P-39 Nanako Iwamoto“The effect of Ca2+ on molecular mass and viscosity of poly-γ-glutamic acidinfermentative production”

P-40 Masahiro Oyama“Exploration of novel factors related to gene expression of drug efflux pumps in S.
cerevisiae”

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P-42 Daiki Masuda“Identification and characterization of genes involved in constructing spike
structure of fission yeast spore surface”

P-43 Soichiro Seki

“Excess accumulation of carotenoids in a siphonous green alga, Codium fragile
upon different light strengths”

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P-45 Shotaro Horikawa“Bonding strength evaluation of Al foil/AlN junctions by surface activated bonding”

P-46 Zexin Wan“Analysis of SiC/Si Bonding Interface with Thermal Annealing Treatment by XPS”

P-47 Takuya Higashiguchi “Photoinduced Shape Change of Crystals Composed of a Diarylethene with aLong Alkyl Chain”
P-48 Yuya Seto

“Photoluminescence Switching of Quantum Dot Coated with Diarylethenes byPhotochromic Reaction”

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P-50 Kazuya Tamejima“Simultaneous observation of nanoparticles and hexane droplets in hexane/wateremulsion by quick freeze replica electron microscopy”

P-51 Daisuke Furukawa “Study on Micro-Tomographically Functional Imaging of Blood Flow in Vascular
Plexuses using Optical Coherence Doppler Velocigraphy”
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inside Regenerated Tissue using UA-OCDV”

P-53 Miki Yanagisawa“Construction on Medical Diagnosing System by Photo-thermal Doppler OCT (PTOCDV) using photosensitizer”

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Photoinduced Shape Change of Crystals Composed of a
Diarylethene with a Long Alkyl Chain    Takuya Higashiguchi, Daichi Kitagawa, Seiya Kobatake
Department of Applied Chemistry, Graduate School of Engineering,Osaka City University, Osaka 558-8585, Japan
Diarylethene crystals exhibit various photomechanicalbehaviors such as contraction, expansion, bending,fragmentation, and twisting, which are expected to beapplied to photoactuators [1]. In particular, crystals
consisting of a diarylethene with a long alkyl group exhibit

DE-(C11)2
unique photomechanical behavior accompanying a reversible
thrmodynamic single-crystal-to-single-crystal phase transition [2]. In this study, weinvestigated on crystal shape changes of a diarylethene having undecyl group at both sides(DE-(C11)2) upon photoirradiation.

Upon irradiation with UV light, the crystal bent toward the incident light, but the degreeof bending depended on the illumination directions (i.e. left or right) as shown in Figure 1.
Furthermore, when another plane of the rod-like crystal was irradiated with UV light, thecrystal twisted toward the incident light. The degree of twisting also depended on illumination
directions as shown in Figure 2. Moreover, in the course of study, it was found that crystals ofDE-(C11)2 were "twin crystal", as can be seen from single crystal X-ray diffraction analysis.
The crystals always have striations at twin boundaries as observed by scanning electron
microscopy. The two crystals in the twin crystal have different thickness. The mechanism oftheseUV
UVphotomechanical
UV
UV
behaviors will beVis.
Vis.
discussed basedon the molecular Figure 1. Photoinduced bending behavior depending on illumination sides.
packing of a UV irradiation was performed for 10 s.
diarylethene andUVUVUVUVeach thickness inthe twin crystal.
Vis.
Vis.
300 μm300 μm

Figure 2. Photoinduced twisting behavior depending on illumination sides.
UV irradiation was performed for 10 s.
[1] M. Irie, T. Fukaminato, K. Matsuda, S. Kobatake, Chem. Rev., 2014, 114, 12174-12277.
[2] D. Kitagawa, K. Kawasaki, R. Tanaka, S. Kobatake, Chem. Mater., 2017, 29, 7524-7532.

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