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  1. Article ; Online: Directly modulated optical negative feedback lasers for long-range FMCW LiDAR.

    Yokota, Nobuhide / Kiuchi, Hiroki / Yasaka, Hiroshi

    Optics express

    2022  Volume 30, Issue 7, Page(s) 11693–11703

    Abstract: Frequency sweep operation of directly modulated optical negative feedback lasers is numerically and experimentally investigated for frequency-modulated continuous-wave (FMCW) light detection and ranging (LiDAR) with a high signal-to-noise ratio (SNR), ... ...

    Abstract Frequency sweep operation of directly modulated optical negative feedback lasers is numerically and experimentally investigated for frequency-modulated continuous-wave (FMCW) light detection and ranging (LiDAR) with a high signal-to-noise ratio (SNR), particularly over a long range. Low FM noise corresponding to a spectral linewidth of ∼2.0 kHz is sustained even with injection current modulation of an optical negative feedback laser through optical feedback from a Fabry-Perot etalon, and a beat note spectrum with a 30-dB SNR is achieved even when a 300-m delay fiber is used as a ranging sample. These results encourage an approach to provide directly modulated frequency-swept lasers for long-range FMCW LiDAR.
    Language English
    Publishing date 2022-04-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.452284
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Mechanism of high photoluminescence quantum yield of melem.

    Kiuchi, Hiroki / Sonoda, Yoriko / Miyake, Yuto / Kobayashi, Fumiya / Tsutsumi, Jun'ya / Tadokoro, Makoto / Kanai, Kaname

    Physical chemistry chemical physics : PCCP

    2022  Volume 24, Issue 38, Page(s) 23602–23611

    Abstract: To produce high-efficiency organic light-emitting diodes, materials that exhibit thermally activated delayed fluorescence (TADF) are attracting attention as alternatives to phosphorescent materials containing heavy metallic elements. Melem, a small ... ...

    Abstract To produce high-efficiency organic light-emitting diodes, materials that exhibit thermally activated delayed fluorescence (TADF) are attracting attention as alternatives to phosphorescent materials containing heavy metallic elements. Melem, a small molecule with a heptazine backbone composed only of nitrogen, carbon, and hydrogen, is known to emit light in the near-ultraviolet region and exhibit high photoluminescence (PL) quantum yield and delayed fluorescence. However, the mechanism underlying the high PL quantum yield remains unclear. This study aimed to elucidate the mechanism of the high PL quantum yield of melem by examining its optical properties in detail. When the amount of dissolved oxygen in the melem solution was increased by bubbling oxygen through it, the PL quantum yield and emission lifetime decreased significantly, indicating that the triplet state was involved in the light-emission mechanism. Furthermore, the temperature dependence of the PL intensity of melem was investigated; the PL intensity decreased with decreasing temperature, indicating that it increases thermally. The experimental results show that melem is a TADF material that produces an extremely high PL quantum yield by upconversion from the triplet to the singlet excited state.
    Language English
    Publishing date 2022-10-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d2cp03693b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Growth and characterization of melem hydrate crystals with a hydrogen-bonded heptazine framework.

    Dai, Tomonori / Kiuchi, Hiroki / Minamide, Hiroki / Miyake, Yuto / Inoki, Hiroya / Sonoda, Yoriko / Tsutsumi, Jun'ya / Kanai, Kaname

    Physical chemistry chemical physics : PCCP

    2022  Volume 24, Issue 22, Page(s) 13922–13934

    Abstract: In carbon nitride (CN) compounds, hydrogen bonds play a major role in cohesion, in addition to dispersion forces. The crystal structures of CN compounds ... ...

    Abstract In carbon nitride (CN) compounds, hydrogen bonds play a major role in cohesion, in addition to dispersion forces. The crystal structures of CN compounds produced
    Language English
    Publishing date 2022-06-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d2cp00691j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Preparation and characterization of poly(ethylene glycol) crosslinked chitosan films

    Kiuchi, Hiroki / Kai, Weihua / Inoue, Yoshio

    Journal of applied polymer science. 2008 Mar. 15, v. 107, no. 6

    2008  

    Abstract: Poly(ethylene glycol) (PEG) crosslinked chitosan films with various PEG to chitosan ratio and PEG molecular weight were successfully prepared via the epoxy-amine reaction between chitosan and PEG-epoxy. The thermal and mechanical properties and swelling ... ...

    Abstract Poly(ethylene glycol) (PEG) crosslinked chitosan films with various PEG to chitosan ratio and PEG molecular weight were successfully prepared via the epoxy-amine reaction between chitosan and PEG-epoxy. The thermal and mechanical properties and swelling behavior were studied for the PEG crosslinked chitosan films. The mechanical strength of chitosan films were greatly enforced by the introduction of PEG-epoxy, achieving an elongation of about 80%. It was found that the crosslinked chitosan films form hydrogel in water, achieving a swelling ratio higher than 20 times of original weight. The swelling behavior of chitosan films relied greatly on the molecular weight of the crosslinker PEG-epoxy and the weight percent of PEG-epoxy. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008
    Language English
    Dates of publication 2008-0315
    Size p. 3823-3830.
    Publishing place Wiley Subscription Services, Inc., A Wiley Company
    Document type Article
    ZDB-ID 1491105-x
    ISSN 1097-4628 ; 0021-8995
    ISSN (online) 1097-4628
    ISSN 0021-8995
    DOI 10.1002/app.27546
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Characterization and enzymatic degradation of PEG-cross-linked chitosan hydrogel films

    Tanuma, Hiroaki / Kiuchi, Hiroki / Kai, Weihua / Yazawa, Koji / Inoue, Yoshio

    Journal of applied polymer science. 2009 Nov. 01, v. 114, no. 3

    2009  

    Abstract: In our previous study (Kiuch et al., J Appl Polym Sci 2008, 107, 3823), poly(ethylene glycol) (PEG) cross-linked chitosan hydrogel films with various PEG to chitosan ratio and PEG molecular weight have been successfully prepared and their thermal, ... ...

    Abstract In our previous study (Kiuch et al., J Appl Polym Sci 2008, 107, 3823), poly(ethylene glycol) (PEG) cross-linked chitosan hydrogel films with various PEG to chitosan ratio and PEG molecular weight have been successfully prepared and their thermal, mechanical and swelling properties at acidic pH were studied. These films are potential biodegradable polymeric materials, because their constituents, that is, chitosan and PEG, are well known as biodegradable polymers. In this study, glass transition temperature (Tg), contact angle, swelling behavior at physiological conditions and in vitro enzymatic degradation behavior were investigated for the PEG-cross-linked chitosan hydrogel films. These properties of chitosan hydrogel were found to change significantly upon introducing the PEG-cross-links. According to differential scanning calorimeter analysis, the Tg value increased with the PEG content in the hydrogel films, indicating the densification of the film by PEG-crosslinking. The contact angle was decreased with increasing the number of crosslinks, reflecting that introduction of the cross-linked structure induced the reduction of chitosan ordered structure. The swelling behavior depended on the PEG to chitosan ratio and the cross-linked structure. The water content was changed with the number of PEG-crosslinks. The rate of lysozyme-catalyzed degradation was also influenced by the introduction of PEG-cross-linked structure. The surface morphology of the film was observed by the scanning electron microscopy. It was confirmed that the PEG-cross-linked chitosan hydrogel film was degraded by lysozyme from its surface area.
    Language English
    Dates of publication 2009-1101
    Size p. 1902-1907.
    Publishing place Wiley Subscription Services, Inc., A Wiley Company
    Document type Article
    ZDB-ID 1491105-x
    ISSN 1097-4628 ; 0021-8995
    ISSN (online) 1097-4628
    ISSN 0021-8995
    DOI 10.1002/app.30277
    Database NAL-Catalogue (AGRICOLA)

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  6. Article ; Online: Trans-splicing as a novel method to rapidly produce antibody fusion proteins.

    Iwasaki, Ryohei / Kiuchi, Hiroki / Ihara, Masaki / Mori, Toshihiro / Kawakami, Masayuki / Ueda, Hiroshi

    Biochemical and biophysical research communications

    2009  Volume 384, Issue 3, Page(s) 316–321

    Abstract: To cultivate the use of trans-splicing as a novel means to rapidly express various antibody fusion proteins, we tried to express antibody-reporter enzyme fusions in a COS-1 co-transfection model. When a vector designed to induce trans-splicing with IgH ... ...

    Abstract To cultivate the use of trans-splicing as a novel means to rapidly express various antibody fusion proteins, we tried to express antibody-reporter enzyme fusions in a COS-1 co-transfection model. When a vector designed to induce trans-splicing with IgH pre-mRNA was co-transfected with a vector encoding the mouse IgM locus, the expression of V(H)-secreted human placental alkaline phosphatase (SEAP) as well as Fab-SEAP were successfully expressed both in mRNA and protein levels. Especially, the vectors encoding complementary sequence to Smu as a binding domain was accurate and efficient, producing trans-spliced mRNA of up to 2% of cis-spliced one. Since Smu sequence should exist in every IgH pre-mRNA, our finding will lead to the rapid production and analysis of various antibody-enzyme fusions suitable for enzyme-linked immunosorbent assay (ELISA) or antibody-dependent enzyme prodrug therapy (ADEPT).
    MeSH term(s) Alkaline Phosphatase ; Animals ; Antibodies, Monoclonal/biosynthesis ; Antibodies, Monoclonal/genetics ; COS Cells ; Cercopithecus aethiops ; Enzyme-Linked Immunosorbent Assay ; GPI-Linked Proteins ; Genetic Vectors ; Humans ; Immunoglobulin Fab Fragments/biosynthesis ; Immunoglobulin Fab Fragments/genetics ; Immunoglobulin M/biosynthesis ; Immunoglobulin M/genetics ; Isoenzymes/biosynthesis ; Isoenzymes/genetics ; Mice ; Protein Engineering/methods ; RNA Precursors/biosynthesis ; Recombinant Fusion Proteins/biosynthesis ; Trans-Splicing
    Chemical Substances Antibodies, Monoclonal ; GPI-Linked Proteins ; Immunoglobulin Fab Fragments ; Immunoglobulin M ; Isoenzymes ; RNA Precursors ; Recombinant Fusion Proteins ; Alkaline Phosphatase (EC 3.1.3.1) ; alkaline phosphatase, placental (EC 3.1.3.1)
    Language English
    Publishing date 2009-07-03
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 205723-2
    ISSN 1090-2104 ; 0006-291X ; 0006-291X
    ISSN (online) 1090-2104 ; 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2009.04.122
    Database MEDical Literature Analysis and Retrieval System OnLINE

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