Search Results 1-20 of 91

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  • Structure of a cyanobacterial photosystem I surrounded by octadecameric IsiA antenna proteins

    Akita Fusamichi , Nagao Ryo , Kato Koji , Nakajima Yoshiki , Yokono Makio , Ueno Yoshifumi , Suzuki Takehiro , Dohmae Naoshi , Shen Jian-Ren , Akimoto Seiji , Miyazaki Naoyuki

    … Here we report a 2.7-angstrom resolution cryo-electron microscopic structure of a supercomplex between PSI core trimer and IsiA from a thermophilic cyanobacterium Thermosynechococcus vulcanus. … Detailed arrangement of pigments within the supercomplex, as well as molecular interactions between PSI and IsiA and among IsiAs, were resolved. …

    Communications Biology 3(1), 232, 2020-05-11


  • Time-resolved Conformational Analysis during GPCR-Gs Coupling  [in Japanese]

    Du Yang , Asuru Awuri , Chance Mark R. , Lodowski David T. , Kobilka Brian K. , Chung Ka Young , Duc Nguyen Minh , Rasmussen Søren G.F. , Hilger Daniel , Kubiak Xavier , Wang Liwen , Bohon Jennifer , Kim Hee Ryung , Wegrecki Marcin

    … To understand the precise signaling mechanism, studies have investigated the structural mechanism of signaling proteins using various biochemical and/or biophysical techniques such as X-ray crystallography, nuclear magnetic resonance (NMR), electron microscopy, and electron paramagnetic resonance. …

    Proceedings for Annual Meeting of The Japanese Pharmacological Society 93(0), 3-S28-3, 2020


  • Structure of a cyanobacterial photosystem I tetramer revealed by cryo-electron microscopy

    Kato Koji , Nagao Ryo , Jiang Tian-Yi , Ueno Yoshifumi , Yokono Makio , Chan Siu Kit , Watanabe Mai , Ikeuchi Masahiko , Shen Jian-Ren , Akimoto Seiji , Miyazaki Naoyuki , Akita Fusamichi

    … PCC 7120, analysed by single-particle cryo-electron microscopy (cryo-EM) at 3.3 A resolution. … Time-resolved fluorescence analyses showed that the PSI tetramer has an enhanced excitation-energy quenching. …

    Nature Communications (10), 4929, 2019-10-30


  • Protein Crystallography for Progress in Life Science:A Perspective from High-Resolution Structural Studies of Cytochrome c Oxidase  [in Japanese]

    TSUKIHARA Tomitake

    … Subatomic resolution crystallography and time-resolved structure analysis make further contributions to life science. … On the other hand, cryo-electron microscopy(cryo-EM)single-particle analysis has been successfully applied to structure determination of biological macromolecular assemblies. …

    Nihon Kessho Gakkaishi 61(3), 168-180, 2019


  • Development of An <i>In-Situ</i> Straining and Tomography System in TEM  [in Japanese]

    Hata Satoshi , Miyazaki Hiroya , Saito Hikaru , Murayama Mitsuhiro , Sato Kazuhisa , Kudo Hiroyuki , Furukawa Hiromitsu , Kawamoto Katsumi , Horii Noritaka , Kamo Katsumi , Miyazaki Shinsuke , Gondo Takashi

    … <p>We have developed a unique methodology and a new hardware/software-integrated system for in-situ straining and electron tomography (ET) experiments. … The central software of the system controls a straining-and-tomography specimen holder, imaging devices and the specimen stage of a transmission electron microscope (TEM) in an integrated manner. …

    KENBIKYO 54(1), 44-48, 2019


  • Kinetics of Block Copolymer Micelles Formed in Solution  [in Japanese]

    SATO Takahiro , TAKAHASHI Rintaro

    … <p>We overview both theoretical and experimental studies on the following kinetics of block copolymer micelles formed in a selective solvent reported so far: 1) the exchange kinetics of block copolymer chains among micelles was investigated by time-resolved small-angle neutron scattering for deuterated block copolymer micelles mixed with corresponding non-labeled micelles; …

    KOBUNSHI RONBUNSHU 76(1), 3-22, 2019


  • Structural Fluctuation in Alloy Nanoparticles Revealed by Time-Resolved High-Voltage Electron Microscopy  [in Japanese]

    Sato Kazuhisa , Yasuda Hidehiro

    … <p>The development of long-range order in disordered Co-Pt alloy nanoparticles has been atomically resolved <i>in situ</i> … with an ultra-high voltage electron microscope equipped with a direct electron detection camera. … Electron-irradiation-enhanced ordering occured at 573 K with 1 MeV electrons at a dose rate of 8.9 × 10<sup>24</sup> …

    KENBIKYO 53(2), 80-84, 2018


  • Structural Fluctuation in Co-Pt Nanoparticles Revealed by Time-resolved High-voltage Electron Microscopy  [in Japanese]

    Sato Kazuhisa , Yasuda Hidehiro

    Materia Japan 57(12), 609-609, 2018


  • Investigation of Interfacial Charge Transfer in Solution Processed Cs2SnI6 Thin Films

    Kapil Gaurav , Ohta Takeshi , Koyanagi Tsuguo , Vigneshwaran Murugan , Zhang Yaohong , Ogomi Yuhei , Pandey Shyam S. , Yoshino Kenji , Shen Qing , Toyoda Taro , Rahman Md. Mijanur , Minemoto Takashi , Murakami Takurou N. , Segawa Hiroshi , Hayase Shuzi

    … Therefore, intrinsic properties of Cs2SnI6 have been investigated in detail to explore its potentiality as light absorber along with facile electron and hole transport. … The presence of two emission peaks at 710 and 885 nm in the prepared Cs2SnI6 thin films indicated coexistence of quantum dot and bulk parts which were further supported by transmission electron microscopy (TEM) investigations. …

    The Journal of Physical Chemistry C 121(24), 13092-13100, 2017-06-22


  • Spatio-temporal Observation of Photogenerated Carrier Dynamics on a Semiconductor Surface  [in Japanese]

    FUKUMOTO Keiki

    …  A system for time-resolved photoemission electron microscopy (TR-PEEM) conducted with femtosecond laser pulses has been developed to explore the photogenerated electron dynamics on semiconductor surfaces. … Attained space and time resolutions were 100 nm and 100 fs, respectively. …

    Journal of the Vacuum Society of Japan 60(10), 388-391, 2017


  • Temporally and Spatially Resolved Investigation of Soot Morphology in a Transient Diesel Spray Flame via Transmission Electron Microscopy

    Kuno Hirohito , Matsudaira Takeshi , Kondo Katsufumi , Aizawa Tetsuya

    … <p>For better understanding of soot formation processes in a diesel spray flame, soot particles in a single-shot diesel spray flame were sampled using a newly developed spring-actuated high-speed shuttered soot sampler at different in-flame locations and sampling timings and their morphology was investigated via Transmission Electron Microscopy (TEM). …

    The Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines 2017.9(0), B208, 2017


  • Relaxation Dynamics of Photo-excited State in Semiconductors Using Time-resolved Photoemission Electron Microscopy  [in Japanese]

    福本 恵紀

    光学 = Japanese journal of optics : publication of the Optical Society of Japan 45(11), 438-440, 2016-11

  • Fluctuation of long-range order in CoPt alloy nanoparticles revealed by time-resolved electron microscopy  [in Japanese]

    佐藤 和久 , 保田 英洋

    大阪大学超高圧電子顕微鏡センター年報 (45), 13-16, 2016

  • Time-Resolved Reflection High-Energy Electron Diffraction Utilizing Streak Method  [in Japanese]

    Abukawa Tadashi

    … <p>A new time-resolved electron-diffraction technique has been developed by combining a reflection high-energy electron diffraction (RHEED) with a streak camera system. … The developed compact system, named streak-camera RHEED, does not require a short-pulsed electron beam for the temporal resolution, and covers a wide range from sub-nano seconds to milli-seconds.</p> …

    KENBIKYO 50(3), 170-172, 2015


  • Ultrafast Electron Microscopy Using Relativistic-Energy Femtosecond Electron Pulses  [in Japanese]

    Yang Jinfeng

    … <p>An ultrafast detection technique on 100 fs time scales over sub-nanometer (even atomic) spatial dimensions has long been a goal for the scientists to reveal and understand the ultrafast structural-change induced dynamics in materials. …

    KENBIKYO 50(3), 156-159, 2015


  • Ultrafast Time-Resolution and the Beam Quality in Spin-Polarized Pulse-TEM  [in Japanese]

    Kuwahara Makoto , Ujihara Toru , Asano Hidefumi , Saitoh Koh , Tanaka Nobuo

    … <p>Pulse beam emission in a spin-polarized pulse-TEM (SP-TEM) was performed using a combination of a semiconductor photocathode and an ultra-short pulse laser, which has an ability of a time-resolved measurement. … Time-resolved TEM imaging and pulsed interference fringes were also conducted successfully with a stroboscopic acquisition technique. …

    KENBIKYO 50(3), 151-155, 2015


  • Kinetic Study on Solid-Phase Reduction of Silica-Supported Nickel Oxide Species

    Yamashita Shohei , Yamamoto Yusaku , Katayama Misaki , Inada Yasuhiro

    … The transmission electron microscopy observation clarified that the Ni(0) particle size was dependent on the Ni loading. … The dynamic observations using the time-resolved dispersive XAFS technique showed that the reduction process could be described by the first-order kinetics on the Ni species, which was different from the reduction kinetics of supported PdO species, which is a divalent metal oxide for the same family element. …

    Bulletin of the Chemical Society of Japan 88(12), 1629-1635, 2015


  • Study of Photoelectric Conversion in Benzotrithiophene-Based Conjugated Semiconducting Polymers

    Al-Naamani Eman , Ide Marina , Gopal Anesh , Saeki Akinori , Osaka Itaru , Seki Shu

    … Benzotrithiophene (BTT), where three thiophenes are fused to a central benzene, was polymerized with three kinds of electron accepting units, thiadiazolopyridine (TP), difluorobenzothiadiazole (FT), or naphthobisthiadiazole (NTz). … We have intensively characterized optoelectronic and morphological features of the new polymers by atomic force microscopy, 2-dimensional X-ray diffraction, and time-resolved microwave conductivity. …

    Journal of Photopolymer Science and Technology 28(4), 605-610, 2015


  • Progress of Spectroscopy in Soft-X-Ray Region  [in Japanese]

    KINOSHITA Toyohiko

    … From the first utilization of ES (Electron Synchrotron) in University of Tokyo, synchrotron radiation spectroscopy, especially in vacuum ultraviolet and soft-X-ray region plays important rolls for the study of condensed matters. … Recent trend in spectroscopy is combination with microscopy and time-resolved measurements. …

    Hyomen Kagaku 36(6), 297-302, 2015


  • Construction of Plasmon-Induced Artificial Photosynthesis and its Dynamics Measured by PEEM  [in Japanese]

    UENO Kosei , SUN Quan , MISAWA Hiroaki

    … Furthermore, we succeeded in visualizing the local field distribution of the localized surface plasmon resonance (LSPR) on gold nanoparticles and elucidating the dynamics of the LSPR by a time-resolved photoemission electron microscopy. …

    Hyomen Kagaku 35(12), 668-673, 2014


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