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  1. No Access

    Chapter

    Wireless Backhaul Technology in Wireless Sensor Networks: Basic Framework and Applications

    Setting up a wireless sensor network (WSN) requires installing multiple sensor nodes and gateways. Installation costs of existing WSNs tend to be high when the sensing areas become wide, because all of the sen...

    Hiroaki Togashi, Ryuta Abe, Junpei Shimamura, Ikumi Koga… in Smart Sensors and Systems (2020)

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    Article

    Vasorelaxant effects on rat aortic artery by two types of indole alkaloids, naucline and cadamine

    Two indole alkaloids, naucline from Nauclea officinalis and cadamine from Ochreinauclea maingayii, were individually evaluated for vasorelaxant effects on phenylephrine-precontracted aortic rings. Naucline induce...

    Mineri Ishizuka, Ikumi Koga, Kazumasa Zaima, Toshio Kaneda… in Journal of Natural Medicines (2013)

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    Article

    Vasorelaxant activity of indole alkaloids from Tabernaemontana dichotoma

    The aim of this study was to search for bioactive natural products from medicinal plants targeting vasorelaxant activity and we found the methanol extract from bark of Tabernaemontana dichotoma showed vasorelaxan...

    Kazumasa Zaima, Ikumi Koga, Nobuhide Iwasawa… in Journal of Natural Medicines (2013)

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    Article

    Vasorelaxant effect of isoquinoline derivatives from two species of Popowia perakensis and Phaeanthus crassipetalus on rat aortic artery

    Five bisbenzyl isoquinolines (1–5), three benzyl isoquinolines (6–8), four isoquinoline alkaloids (9–12), and two unclassified compounds (13 and 14) from Popowia perakensis and Phaeanthus crassipetalus were evalu...

    Kazumasa Zaima, Yuka Takeyama, Ikumi Koga, Aiko Saito… in Journal of Natural Medicines (2012)