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  1. Article: An Experimental Study of a 3D Bone Position Estimation System Based on Fluoroscopic Images.

    Yoshii, Yuichi / Iwahashi, Yuta / Sashida, Satoshi / Shrestha, Pragyan / Shishido, Hidehiko / Kitahara, Itaru / Ishii, Tomoo

    Diagnostics (Basel, Switzerland)

    2022  Volume 12, Issue 9

    Abstract: To compare a 3D preoperative planning image and fluoroscopic image, a 3D bone position estimation system that displays 3D images in response to changes in the position of fluoroscopic images was developed. The objective of the present study was to ... ...

    Abstract To compare a 3D preoperative planning image and fluoroscopic image, a 3D bone position estimation system that displays 3D images in response to changes in the position of fluoroscopic images was developed. The objective of the present study was to evaluate the accuracy of the estimated position of 3D bone images with reference to fluoroscopic images. Bone positions were estimated from reference points on a fluoroscopic image compared with those on a 3D image. The four reference markers positional relationships on the fluoroscopic image were compared with those on the 3D image to evaluate whether a 3D image may be drawn by tracking positional changes in the radius model. Intra-class correlations coefficients for reference marker distances between the fluoroscopic image and 3D image were 0.98-0.99. Average differences between measured values on the fluoroscopic image and 3D bone image for each marker corresponding to the direction of the bone model were 1.1 ± 0.7 mm, 2.4 ± 1.8 mm, 1.4 ± 0.8 mm, and 2.0 ± 1.6 mm in the anterior-posterior view, ulnar side lateral view, posterior-anterior view, and radial side lateral view, respectively. Marker positions were more accurate in the anterior-posterior and posterior-anterior views than in the radial and ulnar side lateral views. This system helps in real-time comparison of dynamic changes in preoperative 3D and intraoperative fluoroscopy images.
    Language English
    Publishing date 2022-09-16
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662336-5
    ISSN 2075-4418
    ISSN 2075-4418
    DOI 10.3390/diagnostics12092237
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Comparison of 3D Bone Position Estimation Using QR Code and Metal Bead Markers.

    Ikumi, Akira / Yoshii, Yuichi / Iwahashi, Yuta / Sashida, Satoshi / Shrestha, Pragyan / Xie, Chun / Kitahara, Itaru / Ishii, Tomoo

    Diagnostics (Basel, Switzerland)

    2023  Volume 13, Issue 6

    Abstract: To improve the accuracy of a 3D bone position estimation system that displays 3D images in response to changes in the position of fluoroscopic images, modified markers using quick response (QR) codes were developed. The aims of this study were to assess ... ...

    Abstract To improve the accuracy of a 3D bone position estimation system that displays 3D images in response to changes in the position of fluoroscopic images, modified markers using quick response (QR) codes were developed. The aims of this study were to assess the accuracy of the estimated bone position on 3D images with reference to QR code markers on fluoroscopic images and to compare its accuracy with metal bead markers. Bone positions were estimated from reference points on a fluoroscopic image compared with those on a 3D image. The positional relationships of QR code and metal bead markers on the fluoroscopic image were compared with those on the 3D image in order to establish whether a 3D image may be drawn by tracking positional changes in radius models. Differences were investigated by comparing the distance between markers on the fluoroscopic image and that on the 3D image, which was projected on the monitor. The error ratio, which was defined as the difference in the measurement between the fluoroscopic and 3D images divided by the fluoroscopic measurement, was compared between QR code and metal bead markers. Error ratios for the QR code markers were 5.0 ± 2.0%, 6.4 ± 7.6%, and 1.0 ± 0.8% in the anterior-posterior view, ulnar side lateral view, and posterior-anterior view, respectively. Error ratios for the metal bead markers were 1.3 ± 1.7%, 13.8 ± 14.5%, and 4.7 ± 5.7% in the anterior-posterior view, ulnar side lateral view, and posterior-anterior view, respectively. The error ratio for the metal bead markers was smaller in the initial position (
    Language English
    Publishing date 2023-03-16
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662336-5
    ISSN 2075-4418
    ISSN 2075-4418
    DOI 10.3390/diagnostics13061141
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Light intensity influences feeding and fecundity of Tetranychus urticae (Acari: Tetranychidae) through the responses of host Cucumis sativus leaves.

    Shibuya, Toshio / Iwahashi, Yuta / Suzuki, Takeshi / Endo, Ryosuke / Hirai, Norio

    Experimental & applied acarology

    2020  Volume 81, Issue 2, Page(s) 163–172

    Abstract: We investigated feeding and fecundity of the two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae), on leaves of cucumber (Cucumis sativus) seedlings that had been acclimatized to different light intensities. Based on these data, we ... ...

    Abstract We investigated feeding and fecundity of the two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae), on leaves of cucumber (Cucumis sativus) seedlings that had been acclimatized to different light intensities. Based on these data, we analyzed the relationships between mite performance (feeding and fecundity) and leaf properties. The cucumber seedlings were grown in controlled-environment chambers under different light intensities at a photosynthetic photon flux density of 50, 100, 150, 300, or 450 µmol m
    MeSH term(s) Animals ; Cucumis sativus ; Female ; Fertility ; Mites ; Plant Leaves ; Tetranychidae
    Language English
    Publishing date 2020-05-06
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 11320-7
    ISSN 1572-9702 ; 0168-8162
    ISSN (online) 1572-9702
    ISSN 0168-8162
    DOI 10.1007/s10493-020-00496-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Conformational equilibrium shift underlies altered K

    Iwahashi, Yuta / Toyama, Yuki / Imai, Shunsuke / Itoh, Hiroaki / Osawa, Masanori / Inoue, Masayuki / Shimada, Ichio

    Nature communications

    2020  Volume 11, Issue 1, Page(s) 5168

    Abstract: The potassium ion ( ... ...

    Abstract The potassium ion (K
    MeSH term(s) Alanine/genetics ; Ataxia/genetics ; Bacterial Proteins/genetics ; Bacterial Proteins/isolation & purification ; Bacterial Proteins/metabolism ; Epilepsy/genetics ; Humans ; Ion Channel Gating/genetics ; Long QT Syndrome/genetics ; Magnetic Resonance Spectroscopy ; Molecular Dynamics Simulation ; Mutation, Missense ; Potassium/metabolism ; Potassium Channels/genetics ; Potassium Channels/isolation & purification ; Potassium Channels/metabolism ; Protein Conformation, alpha-Helical/genetics ; Recombinant Proteins/genetics ; Recombinant Proteins/isolation & purification ; Recombinant Proteins/metabolism ; Streptomyces lividans ; Valine/genetics
    Chemical Substances Bacterial Proteins ; Potassium Channels ; Recombinant Proteins ; prokaryotic potassium channel ; Valine (HG18B9YRS7) ; Alanine (OF5P57N2ZX) ; Potassium (RWP5GA015D)
    Language English
    Publishing date 2020-10-14
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-020-19005-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Structural mechanism underlying G protein family-specific regulation of G protein-gated inwardly rectifying potassium channel.

    Kano, Hanaho / Toyama, Yuki / Imai, Shunsuke / Iwahashi, Yuta / Mase, Yoko / Yokogawa, Mariko / Osawa, Masanori / Shimada, Ichio

    Nature communications

    2019  Volume 10, Issue 1, Page(s) 2008

    Abstract: G protein-gated inwardly rectifying potassium channel (GIRK) plays a key role in regulating neurotransmission. GIRK is opened by the direct binding of the G protein βγ subunit (Gβγ), which is released from the heterotrimeric G protein (Gαβγ) upon the ... ...

    Abstract G protein-gated inwardly rectifying potassium channel (GIRK) plays a key role in regulating neurotransmission. GIRK is opened by the direct binding of the G protein βγ subunit (Gβγ), which is released from the heterotrimeric G protein (Gαβγ) upon the activation of G protein-coupled receptors (GPCRs). GIRK contributes to precise cellular responses by specifically and efficiently responding to the Gi/o-coupled GPCRs. However, the detailed mechanisms underlying this family-specific and efficient activation are largely unknown. Here, we investigate the structural mechanism underlying the Gi/o family-specific activation of GIRK, by combining cell-based BRET experiments and NMR analyses in a reconstituted membrane environment. We show that the interaction formed by the αA helix of Gαi/o mediates the formation of the Gαi/oβγ-GIRK complex, which is responsible for the family-specific activation of GIRK. We also present a model structure of the Gαi/oβγ-GIRK complex, which provides the molecular basis underlying the specific and efficient regulation of GIRK.
    MeSH term(s) Bioluminescence Resonance Energy Transfer Techniques ; G Protein-Coupled Inwardly-Rectifying Potassium Channels/metabolism ; G Protein-Coupled Inwardly-Rectifying Potassium Channels/ultrastructure ; GTP-Binding Protein alpha Subunits, Gi-Go/isolation & purification ; GTP-Binding Protein alpha Subunits, Gi-Go/metabolism ; GTP-Binding Protein alpha Subunits, Gi-Go/ultrastructure ; GTP-Binding Protein beta Subunits/isolation & purification ; GTP-Binding Protein beta Subunits/metabolism ; GTP-Binding Protein beta Subunits/ultrastructure ; GTP-Binding Protein gamma Subunits/isolation & purification ; GTP-Binding Protein gamma Subunits/metabolism ; GTP-Binding Protein gamma Subunits/ultrastructure ; HEK293 Cells ; Humans ; Ion Channel Gating/physiology ; Models, Molecular ; Nuclear Magnetic Resonance, Biomolecular ; Recombinant Proteins/isolation & purification ; Recombinant Proteins/metabolism ; Recombinant Proteins/ultrastructure
    Chemical Substances G Protein-Coupled Inwardly-Rectifying Potassium Channels ; G-protein Beta gamma ; GTP-Binding Protein beta Subunits ; GTP-Binding Protein gamma Subunits ; Recombinant Proteins ; GTP-Binding Protein alpha Subunits, Gi-Go (EC 3.6.5.1)
    Language English
    Publishing date 2019-05-01
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-019-10038-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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