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19th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2015

作者： Seo, H. Pihosh, Y. Kazoe, Y. Mawatari, K. Kitamura, K. Tabata, O. Tsuchiya, T. Kitamori, T. University of Tokyo Department of Applied Chemistry School of Engineering Japan Japan Science and Technology Agency Core Research for Evolutional Science and Technology Japan National Institute for Materials Science Optoelectronic Materials Group Japan Kyoto University Department of Micro Engineering Japan

ISBN: (纸本)9780979806483

In this work, we report on the possibility of controlling the surface potential of extended-nano channels (ENCs) made in a system of SiO2/LiNbO3 (LN), which can promote improvement of the proton diffusion rate. We detected the optimal thickness of a SiO2 film which is ∼ 5 nm, where the deposited material would not affect spontaneous polarization of the LN material, which results in enhanced protontransport in ENCs. Here, we describe the device concept, the effect of SiO2 thickness on the LN surface potential, demonstrate the device working principle and show its enhancement of 2.5 times in proton diffusion in comparison to the balk value. © 15CBMS-0001.

关键词： Surface potential

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Interconversion between formate and hydrogen carbonate by tungsten-containing formate dehydrogenase-catalyzed mediated bioelectrocatalysis

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Sensing and Bio-Sensing research 2015年 5卷 90-96页

作者： Sakai, Kento Hsieh, Bo-Chuan Maruyama, Akihiro Kitazumi, Yuki Shirai, Osamu Kano, Kenji Division of Applied Life Sciences Graduate School of Agriculture Kyoto University Sakyo Kyoto 606-8502 Japan Department of Bio-Industrial Mechatronics Engineering College of Bio-Resources and Agriculture National Taiwan University Taipei 10617 Taiwan Core Research for Evolutional Science and Technology (Crest) Japan Science and Technology Agency (JST) Chiyoda Tokyo 102-00076 Japan

We have focused on the catalytic properties of tungsten-containing formate dehydrogenase (FoDH1) from Methylobacterium extorquens AM1 to construct a bioelectrochemical interconversion system between formate (HCOO^-) and hydrogen carbonate (HCO₃^-). FoDH1 catalyzes both of the HCOO oxidation and the HCO₃^- reduction with several artificial dyes. The bi-molecular reaction rate constants between FoDH1 and the artificial electron acceptors and NAD⁺ (as the natural electron acceptor) show the property called a linear free energy relationship (LFER), indicating that FoDH1 would have no specificity to NAD⁺. Similar LFER is also observed for the catalytic reduction of HCO₃^-. The reversible reaction between HCOO^- and HCO₃^- through FoDH1 has been realized on cyclic voltammetry by using methyl viologen (MV) as a mediator and by adjusting pH from the thermodynamic viewpoint. Potentiometric measurements have revealed that the three redox couples, MV²⁺/MV⁺, HCOO^-/HCO₃^-, FoDH1 (ox/red), reach an equilibrium in the bulk solution when the two-way bioelectrocatalysis proceeds in the presence of FoDH1 and MV. The steady-state voltammograms with two-way bioelectrocatalytic properties are interpreted on a simple model by considering the solution equilibrium. © 2015 The Authors.

关键词： Bioelectrocatalytic potentiometry CO2 reduction Formate oxidation Reversible bioelectrocatalysis Tungsten-containing formate dehydrogenase

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Integrated heat pipe device using enhanced capillary condensation and high laplace pressure in extended nanospace 18

Integrated heat pipe device using enhanced capillary condens...

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18th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2014

作者： Wang, Chenxi Kazoe, Yutaka Morikawa, Kyojiro Shimizu, Hisashi Kasai, Kentaro Mawatari, Kazuma Kitamori, Takehiko Department of Applied Chemistry University of Tokyo Japan Japan Science and Technology Agency Core Research for Evolutional Science and Technology Japan

ISBN: (纸本)9780979806476

An integrated heat pipe device based on enhanced condensation speed and high driving Laplace pressure in extended-nano space (101-103 nm scale) is developed for a non-electric cooling. To verify the working principle, streaming potential measurements between the evaporator and condenser are carried out. This method provides a promising tool for the investigation of vapor-liquid phase transition in the extended-nano space. Liquid circulation between the evaporator and condenser are evaluated quantitatively demonstrating the extended-nano heat pipe working properly for the first time. It has great potentials for realization of high-performance cooling devices. © 14CBMS.

关键词： Heat pipes

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BSS1 as a negative regulator for brassinosteroid signaling that was identified by chemical biology using Brz

BSS1 as a negative regulator for brassinosteroid signaling t...

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The 2nd International Brassinosteroid Conference(第二届国际油菜素甾醇会议)

作者： Takeshi Nakano Setsuko Shimada Tomoyuki Komatsu Ayumi Yamagami Miki Nakazawa Minami Matsui Hiroshi Kawaide Masahiro Natsume Hiroyuki Osada Tadao Asami RIKEN Genome Science Center TsurumiYokohamaKanagawa 230-0045Japan Chemical Biology Group RIKEN Center for Sustainable Resource ScienceWakoSaitama 351-0198Japan Core Research for Evolutional Science and Technology(CREST) Japan Science and Technology Agency(JST)Japan Gene Discovery Research Group RIKEN Center for Sustainable Resource ScienceWakoSaitama 351-0198Japan United Graduate School of Agricultural Science Tokyo University of Agriculture and Technology(TUAT)Saiwai-ChoFuchuTokyo 183-8509Japan Synthetic Genomics Research Team Biomass Engineering Program Cooperation DivisionRIKEN Center for Sustainable Resource ScienceTsurumiYokohamaKanagawa 230-0045Japan Department of Applied Biological Chemistry The University of TokyoYayoiBunkyo-kuTokyo 113-8657Japan

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Solar light driven micro fliel (H2/O2) generation device based on the microfluidic chip

Solar light driven micro fliel (H2/O2) generation device bas...

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17th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2013

作者： Pihosh, Y. Kajita, Y. Mawatari, K. Kitamori, T. Department of Applied Chemistry University of Tokyo Japan Core Research for Evolutional Science and Technology Japan Science and Technology Agency Japan

ISBN: (纸本)9781632666246

In this work, we report on the development of a solar light driven micro fuel (H2/O2) generation device based on the microfluidic chip platform which can be later applied in fabrication of portable micro fuel cell devices. We successfully integrated Pt microelectrode and TiO2 nanostructure as a phototoanode with the help of bottom up and top down technological processes in order to create an internal fuel generation and a separation system in the micro scale area. We describe the device concept and demonstrate its working principle under solar light illumination, and successfully verified H2/O2 generation rate by GC-MS in the microfluidic chip. Copyright © (2013) by the Chemical and Biological Microsystems Society All rights reserved. All rights reserved.

关键词： Microfluidic chips

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Development of a micro fuel cell device based on the microfluidic chip

Development of a micro fuel cell device based on the microfl...

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17th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2013

作者： Pihosh, Y. Chinen, H. Mawatari, K. Kitamori, T. University of Tokyo Department of Applied Chemistry Japan Japan Science and Technology Agency Core Research for Evolutional Science and Technology Japan

ISBN: (纸本)9781632666246

In this work, we report on the development of a micro fuel cell device (MFC) (free of the proton exchange membrane (PEM)) on a fused silica microfluidic chip platform where a new approach to utilizing extended-nano channels for efficient proton transport and separation has been realized. Experimentally we detected that a small amount of Pd components (∼10 wt.%) is the best concentration for the anode material operated at the room temperature. Also we detected efficiency improvement of the present MFC when changing the nanochannels' number and size. With the device operated at 25°C, the maximum power output was recorded at ∼25 μW/cm2.

关键词： Microfluidic chips

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Enhancement of capillary condensation in extended nanospace for high-performance micro heat pipe device

Enhancement of capillary condensation in extended nanospace ...

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17th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2013

作者： Kasai, Kentaro Wang, Chenxi Shimizu, Hisashi Kazoe, Yutaka Mawatari, Kazuma Kitamori, Takehiko Department of Applied Chemistry University of Tokyo Japan Japan Science and Technology Agency Core Research for Evolutional Science and Technology Japan

ISBN: (纸本)9781632666246

We developed a facile measurement method of capillary condensation speed of water on nanopillars. The results show a significant enhancement of the condensation speed in nanospace compared to the bulk space. This phenomenon is utilized to achieve a novel "extended-nano heat pipe device", in which a non-electric cooling is expected to be realized. Our findings demonstrate a significantly high speed condensation (3 times) in nanospace for the first time and this specific property is adopted for realizing high-performance cooling devices.

关键词： Nanostructures

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Uptake of biodegradable poly(γ-glutamic acid) nanoparticles and antigen presentation by dendritic cells in vivo

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Results in Immunology 2013年第p.1/94期3卷 1-9页

作者： Uto, Tomofumi Toyama, Masaaki Nishi, Yosuke Akagi, Takami Shima, Fumiaki Akashi, Mitsuru Baba, Masanori Division of Antiviral Chemotherapy Center for Chronic Viral Diseases Graduate School of Medical and Dental Sciences Kagoshima University Kagoshima 890-0544 8-35-1 Sakuragaoka Japan Department of Applied Chemistry Graduate School of Engineering Osaka University Suita 565-0871 Japan Core Research for Evolutional Science and Technology (CREST) The Japan Science and Technology Agency (JST) Tokyo 150-0002 Japan

Poly(γ-glutamic acid) (γ-PGA) nanoparticles (NPs) carrying antigens have been shown to induce potent antigen-specific immune responses. However, in vivo delivery of γ-PGA NPs to dendritic cells (DCs), a key regulator of immune responses, still remains unclear. In this study, γ-PGA NPs were examined for their uptake by DCs and subsequent migration from the skin to the regional lymph nodes (LNs) in mice. After subcutaneous injection of fluorescein 5-isothiocyanate (FITC)-labeled NPs or FITC-ovalbumin (OVA)-carrying NPs (FITC-OVA-NPs), DCs migrated from the skin to the LNs and maturated, resulting in the upregulation of the costimulatory molecules CD80 and CD86 and the chemokine receptor CCR7. However, the migrated DCs were not detected in the spleen. FITC-OVA-NPs were found to be taken up by skin-derived CD103⁺ DCs, and the processed antigen peptides were cross-presented by the major histocompatibility complex (MHC) class I molecule of DCs. Furthermore, significant activation of antigen-specific CD8⁺ T cells was observed in mice immunized with OVA-carrying NPs (OVA-NPs) but not with OVA alone or OVA with an aluminum adjuvant. The antigen-specific CD8⁺ T cells were induced within 7 days after immunization with OVA-NPs. Thus, γ-PGA NPs carrying various antigens may have great potential as an antigen-delivery system and vaccine adjuvant in vivo. © 2013 Elsevier B.V.

关键词： Dendritic cell Drug delivery Immune response Nanoparticle Vaccine

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Inside Cover: Effect of the Nature of the CeO2Support of the Rh Catalyst on Triggering the Oxidative Reforming ofn-Butane for H2Production from Ambient Temperature (ChemCatChem 3/2014)

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ChemCatChem 2014年第3期6卷 666-666页

作者： Dr. Katsutoshi Sato Kouhei Adachi Prof. Dr. Yusaku Takita Dr. Katsutoshi Nagaoka Elements Strategy Initiative for Catalysts and Batteries (ESICB) Kyoto University 1-30 Goryo-Ohara Nishikyo-ku Kyoto 615-8245 (Japan) Department of Applied Chemistry Faculty of Engineering Oita University 700 Dannoharu Oita 870-1192 (Japan) Fax: (+81) 97-554-7979 Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) 7 Gobancho Chiyoda-ku Tokyo 102-0076 (Japan)

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Motion Capture and Manipulation of a Single Synthetic Molecular Rotor by Optical Microscopy†

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Angewandte Chemie 2014年第38期126卷

作者： Tomohiro Ikeda Takahiro Tsukahara Ryota Iino Masayuki Takeuchi Hiroyuki Noji Department of Applied Chemistry School of Engineering The University of Tokyo Bunkyo‐ku Tokyo 113‐8656 (Japan) Okazaki Institute for Integrative Bioscience Institute for Molecular Science National Institutes of Natural Sciences Higashiyama Myodaijicho Okazaki Aichi 444‐8787 (Japan) Organic Materials Group Polymer Materials Unit National Institute for Materials Science 1‐2‐1 Sengen Tsukuba Ibaraki 305‐0047 (Japan) Core Research for Evolutional Science and Technology (Japan) Science and Technology Agency Sanban‐cho Chiyoda‐ku Tokyo 102‐0075 (Japan)

Single‐molecule imaging and manipulation with optical microscopy have become essential methods for studying biomolecular machines; however, only few efforts have been directed towards synthetic molecular machines. Single‐molecule optical microscopy was now applied to a synthetic molecular rotor, a double‐decker porphyrin (DD). By attaching a magnetic bead (ca. 200 nm) to the DD, its rotational dynamics were captured with a time resolution of 0.5 ms. DD showed rotational diffusion with 90° steps, which is consistent with its four‐fold structural symmetry. Kinetic analysis revealed the first‐order kinetics of the 90° step with a rate constant of 2.8 s −1 . The barrier height of the rotational potential was estimated to be greater than 7.4 kJ mol −1 at 298 K. The DD was also forcibly rotated with magnetic tweezers, and again, four stable pausing angles that are separated by 90° were observed. These results demonstrate the potency of single‐molecule optical microscopy for the elucidation of elementary properties of synthetic molecular machines.

关键词： Einzelmoleküluntersuchungen Moleküldynamik Molekulare Maschinen Optische Mikroskopie Porphyrine

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