432 results on '"M. Tsukada"'
Search Results
2. Search for supernova bursts in Super-Kamiokande IV
- Author
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M. Mori, K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, S. Imaizumi, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nagao, M. Nakahata, Y. Nakano, S. Nakayama, Y. Noguchi, T. Okada, K. Okamoto, A. Orii, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, T. Tomiya, S. Watanabe, T. Yano, S. Yoshida, S. Han, T. Kajita, K. Okumura, T. Tashiro, X. Wang, J. Xia, G. D. Megias, D. Bravo-Berguño, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, S. Zsoldos, B. W. Pointon, F. D. M. Blaszczyk, E. Kearns, J. L. Raaf, J. L. Stone, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, Yankelevich A., J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, Th. A. Mueller, P. Paganini, B. Quilain, A. D. Santos, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, L. H. V. Anthony, D. Martin, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, Y. Maekawa, Y. Nishimura, C. Fujisawa, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, H. Ozaki, T. Shiozawa, A. T. Suzuki, Y. Takeuchi, S. Yamamoto, Y. Kotsar, Y. Ashida, C. Bronner, J. Feng, S. Hirota, T. Kikawa, T. Nakaya, R. A. Wendell, K. Yasutome, N. McCauley, P. Mehta, K. M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, T. Niwa, M. Tsukada, J. Lagoda, S. M. Lakshmi, P. Mijakowski, J. Zalipska, M. Mandal, Y. S. Prabhu, J. Jiang, C. K. Jung, C. Vilela, M. J. Wilking, C. Yanagisawa, M. Jia, K. Hagiwara, M. Harada, T. Horai, H. Ishino, S. Ito, H. Kitagawa, Y. Koshio, W. Ma, F. Nakanishi, N. Piplani, S. Sakai, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, F. Nova, T. Boschi, J. Gao, A. Goldsack, T. Katori, F. Di Lodovico, J. Migenda, M. Taani, J. Y. Yang, S. J. Jenkins, M. Malek, J. M. McElwee, O. Stone, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. B. Kim, J. W. Seo, I. Yu, K. Nishijima, M. Koshiba, K. Nakagiri, Y. Nakajima, K. Iwamoto, N. Taniuchi, M. Yokoyama, K. Martens, P. de Perio, M. R. Vagins, M. Kuze, S. Izumiyama, T. Yoshida, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, R. Matsumoto, K. Ohta, Y. Ommura, N. Shigeta, M. Shinoki, T. Suganuma, K. Yamauchi, J. F. Martin, H. A. Tanaka, T. Towstego, R. Akutsu, V. Gousy-Leblanc, M. Hartz, A. Konaka, N. W. Prouse, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, J. Walker, Ll. Marti, A. Minamino, G. Pintaudi, R. Sasaki, S. Sano, S. Suzuki, K. Wada, S. Cao, A. ichikawa, K. D. Nakamura, S. Tairafune, K. Choi, Mori, M., Abe, K., Hayato, Y., Hiraide, K., Ieki, K., Ikeda, M., Imaizumi, S., Kameda, J., Kanemura, Y., Kaneshima, R., Kashiwagi, Y., Kataoka, Y., Miki, S., Mine, S., Miura, M., Moriyama, S., Nagao, Y., Nakahata, M., Nakano, Y., Nakayama, S., Noguchi, Y., Okada, T., Okamoto, K., Orii, A., Sato, K., Sekiya, H., Shiba, H., Shimizu, K., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Tomiya, T., Watanabe, S., Yano, T., Yoshida, S., Han, S., Kajita, T., Okumura, K., Tashiro, T., Wang, X., Xia, J., Megias, G. D., Bravo-Bergu??o, D., Fernandez, P., Labarga, L., Ospina, N., Zaldivar, B., Zsoldos, S., Pointon, B. W., Blaszczyk, F. D. M., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Smy, M. B., Sobel, H. W., Takhistov, V., A., Yankelevich, Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Bernard, L., Coffani, A., Drapier, O., El Hedri, S., Giampaolo, A., Mueller, Th. A., Paganini, P., Quilain, B., Santos, A. D., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Anthony, L. H. V., Martin, D., Scott, M., Sztuc, A. A., Uchida, Y., Berardi, V., Catanesi, M. G., Radicioni, E., Calabria, N. F., Nascimento Machado, L., De Rosa, G., Collazuol, G., Iacob, F., Lamoureux, M., Mattiazzi, M., Ludovici, L., Gonin, M., Pronost, G., Maekawa, Y., Nishimura, Y., Fujisawa, C., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Jakkapu, M., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Ozaki, H., Shiozawa, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Kotsar, Y., Ashida, Y., Bronner, C., Feng, J., Hirota, S., Kikawa, T., Nakaya, T., Wendell, R. A., Yasutome, K., Mccauley, N., Mehta, P., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Ninomiya, K., Niwa, T., Tsukada, M., Lagoda, J., Lakshmi, S. M., Mijakowski, P., Zalipska, J., Mandal, M., Prabhu, Y. S., Jiang, J., Jung, C. K., Vilela, C., Wilking, M. J., Yanagisawa, C., Jia, M., Hagiwara, K., Harada, M., Horai, T., Ishino, H., Ito, S., Kitagawa, H., Koshio, Y., Ma, W., Nakanishi, F., Piplani, N., Sakai, S., Barr, G., Barrow, D., Cook, L., Samani, S., Wark, D., Nova, F., Boschi, T., Gao, J., Goldsack, A., Katori, T., Di Lodovico, F., Migenda, J., Taani, M., Yang, J. Y., Jenkins, S. J., Malek, M., Mcelwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Kim, S. B., Seo, J. W., Yu, I., Nishijima, K., Koshiba, M., Nakagiri, K., Nakajima, Y., Iwamoto, K., Taniuchi, N., Yokoyama, M., Martens, K., de Perio, P., Vagins, M. R., Kuze, M., Izumiyama, S., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Kinoshita, T., Matsumoto, R., Ohta, K., Ommura, Y., Shigeta, N., Shinoki, M., Suganuma, T., Yamauchi, K., Martin, J. F., Tanaka, H. A., Towstego, T., Akutsu, R., Gousy-Leblanc, V., Hartz, M., Konaka, A., Prouse, N. W., Chen, S., Xu, B. D., Zhang, B., Posiadala-Zezula, M., Hadley, D., Nicholson, M., O???flaherty, M., Richards, B., Ali, A., Jamieson, B., Walker, J., Marti, Ll., Minamino, A., Pintaudi, G., Sasaki, R., Sano, S., Suzuki, S., Wada, K., Cao, S., Ichikawa, A., Nakamura, K. D., Tairafune, S., and Choi, K.
- Subjects
High Energy Astrophysical Phenomena (astro-ph.HE) ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,High Energy Physics - Experiment ,Supernova neutrinos ,High Energy Physics - Experiment (hep-ex) ,Space and Planetary Science ,Core-collapse supernovae Supernova neutrinos Particle astrophysics ,Core-collapse supernovae ,Particle astrophysics ,Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics::Galaxy Astrophysics - Abstract
Super-Kamiokande has been searching for neutrino bursts characteristic of core-collapse supernovae continuously, in real time, since the start of operations in 1996. The present work focuses on detecting more distant supernovae whose event rate may be too small to trigger in real time, but may be identified using an offline approach. The analysis of data collected from 2008 to 2018 found no evidence of distant supernovae bursts. This establishes an upper limit of 0.29 yr−1 on the rate of core-collapse supernovae out to 100 kpc at 90% C.L. For supernovae that fail to explode and collapse directly to black holes the limit reaches to 300 kpc.
- Published
- 2022
3. First gadolinium loading to Super-Kamiokande
- Author
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K. Abe, C. Bronner, Y. Hayato, K. Hiraide, M. Ikeda, S. Imaizumi, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, M. Miura, S. Moriyama, Y. Nagao, M. Nakahata, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronost, H. Sekiya, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, J. Xia, G.D. Megias, D. Bravo-Berguño, L. Labarga, Ll. Marti, B. Zaldivar, B.W. Pointon, F.d.M. Blaszczyk, E. Kearns, J.L. Raaf, J.L. Stone, L. Wan, T. Wester, J. Bian, N.J. Griskevich, W.R. Kropp, S. Locke, S. Mine, M.B. Smy, H.W. Sobel, V. Takhistov, J. Hill, J.Y. Kim, I.T. Lim, R.G. Park, B. Bodur, K. Scholberg, C.W. Walter, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, M. Gonin, Th.A. Mueller, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J.S. Jang, J.G. Learned, L.H.V. Anthony, D. Martin, M. Scott, A.A. Sztuc, Y. Uchida, S. Cao, V. Berardi, M.G. Catanesi, E. Radicioni, N.F. Calabria, L.N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, N. Ospina, L. Ludovici, Y. Maekawa, Y. Nishimura, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, T. Boschi, J. Gao, F. Di Lodovico, J. Migenda, M. Taani, S. Zsoldos, Y. Kotsar, Y. Nakano, H. Ozaki, T. Shiozawa, A.T. Suzuki, Y. Takeuchi, S. Yamamoto, A. Ali, Y. Ashida, J. Feng, S. Hirota, T. Kikawa, M. Mori, T. Nakaya, R.A. Wendell, K. Yasutome, P. Fernandez, N. McCauley, P. Mehta, K.M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, T. Niwa, K. Sato, M. Tsukada, J. Lagoda, S.M. Lakshmi, P. Mijakowski, J. Zalipska, J. Jiang, C.K. Jung, C. Vilela, M.J. Wilking, C. Yanagisawa, K. Hagiwara, M. Harada, T. Horai, H. Ishino, S. Ito, F. Kitagawa, Y. Koshio, W. Ma, N. Piplani, S. Sakai, G. Barr, D. Barrow, L. Cook, A. Goldsack, S. Samani, D. Wark, F. Nova, J.Y. Yang, S.J. Jenkins, M. Malek, J.M. McElwee, O. Stone, M.D. Thiesse, L.F. Thompson, H. Okazawa, S.B. Kim, J.W. Seo, I. Yu, A.K. Ichikawa, K. Nishijima, M. Koshiba, K. Iwamoto, Y. Nakajima, N. Ogawa, M. Yokoyama, K. Martens, M.R. Vagins, M. Kuze, S. Izumiyama, T. Yoshida, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, R. Matsumoto, K. Ohta, M. Shinoki, T. Suganuma, J.F. Martin, H.A. Tanaka, T. Towstego, R. Akutsu, M. Hartz, A. Konaka, P. de Perio, N.W. Prouse, S. Chen, B.D. Xu, M. Posiadala-Zezula, D. Hadley, M. O’Flaherty, B. Richards, B. Jamieson, J. Walker, A. Minamino, G. Pintaudi, S. Sano, R. Sasaki, Abe, K., Bronner, C., Hayato, Y., Hiraide, K., Ikeda, M., Imaizumi, S., Kameda, J., Kanemura, Y., Kataoka, Y., Miki, S., Miura, M., Moriyama, S., Nagao, Y., Nakahata, M., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Watanabe, S., Yano, T., Han, S., Kajita, T., Okumura, K., Tashiro, T., Xia, J., Megias, G. D., Bravo-Berguno, D., Labarga, L., Marti, L., Zaldivar, B., Pointon, B. W., Blaszczyk, F. D. M., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Smy, M. B., Sobel, H. W., Takhistov, V., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Bernard, L., Coffani, A., Drapier, O., Hedri, S. E., Giampaolo, A., Gonin, M., Mueller, T. A., Paganini, P., Quilain, B., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Anthony, L. H. V., Martin, D., Scott, M., Sztuc, A. A., Uchida, Y., Cao, S., Berardi, V., Catanesi, M. G., Radicioni, E., Calabria, N. F., Nascimento Machado, L., De Rosa, G., Collazuol, G., Iacob, F., Lamoureux, M., Mattiazzi, M., Ospina, N., Ludovici, L., Maekawa, Y., Nishimura, Y., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Jakkapu, M., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Boschi, T., Gao, J., Di Lodovico, F., Migenda, J., Taani, M., Zsoldos, S., Kotsar, Y., Nakano, Y., Ozaki, H., Shiozawa, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ali, A., Ashida, Y., Feng, J., Hirota, S., Kikawa, T., Mori, M., Nakaya, T., Wendell, R. A., Yasutome, K., Fernandez, P., Mccauley, N., Mehta, P., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Niwa, T., Sato, K., Tsukada, M., Lagoda, J., Lakshmi, S. M., Mijakowski, P., Zalipska, J., Jiang, J., Jung, C. K., Vilela, C., Wilking, M. J., Yanagisawa, C., Hagiwara, K., Harada, M., Horai, T., Ishino, H., Ito, S., Kitagawa, F., Koshio, Y., Ma, W., Piplani, N., Sakai, S., Barr, G., Barrow, D., Cook, L., Goldsack, A., Samani, S., Wark, D., Nova, F., Yang, J. Y., Jenkins, S. J., Malek, M., Mcelwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Kim, S. B., Seo, J. W., Yu, I., Ichikawa, A. K., Nishijima, K., Koshiba, M., Iwamoto, K., Nakajima, Y., Ogawa, N., Yokoyama, M., Martens, K., Vagins, M. R., Kuze, M., Izumiyama, S., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Kinoshita, T., Matsumoto, R., Ohta, K., Shinoki, M., Suganuma, T., Martin, J. F., Tanaka, H. A., Towstego, T., Akutsu, R., Hartz, M., Konaka, A., de Perio, P., Prouse, N. W., Chen, S., Xu, B. D., Posiadala-Zezula, M., Hadley, D., O'Flaherty, M., Richards, B., Jamieson, B., Walker, J., Minamino, A., Pintaudi, G., Sano, S., and Sasaki, R.
- Subjects
Nuclear and High Energy Physics ,Gadolinium Neutrino Neutron Water Cherenkov detector ,Physics - Instrumentation and Detectors ,010308 nuclear & particles physics ,FOS: Physical sciences ,Gadolinium ,Neutron ,Instrumentation and Detectors (physics.ins-det) ,01 natural sciences ,Water Cherenkov detector ,0103 physical sciences ,Neutrino ,010306 general physics ,Astrophysics - Instrumentation and Methods for Astrophysics ,Instrumentation ,Instrumentation and Methods for Astrophysics (astro-ph.IM) - Abstract
In order to improve Super-Kamiokande's neutron detection efficiency and to thereby increase its sensitivity to the diffuse supernova neutrino background flux, 13 tons of $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$ (gadolinium sulfate octahydrate) was dissolved into the detector's otherwise ultrapure water from July 14 to August 17, 2020, marking the start of the SK-Gd phase of operations. During the loading, water was continuously recirculated at a rate of 60 m$^3$/h, extracting water from the top of the detector and mixing it with concentrated $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$ solution to create a 0.02% solution of the Gd compound before injecting it into the bottom of the detector. A clear boundary between the Gd-loaded and pure water was maintained through the loading, enabling monitoring of the loading itself and the spatial uniformity of the Gd concentration over the 35 days it took to reach the top of the detector. During the subsequent commissioning the recirculation rate was increased to 120 m$^3$/h, resulting in a constant and uniform distribution of Gd throughout the detector and water transparency equivalent to that of previous pure-water operation periods. Using an Am-Be neutron calibration source the mean neutron capture time was measured to be $115\pm1$ $\mu$s, which corresponds to a Gd concentration of $111\pm2$ ppm, as expected for this level of Gd loading. This paper describes changes made to the water circulation system for this detector upgrade, the Gd loading procedure, detector commissioning, and the first neutron calibration measurements in SK-Gd., Comment: 37 pages, 19 Figures, Accepted for publication in Nucl. Instrum. Meth. A
- Published
- 2022
4. Neutron tagging following atmospheric neutrino events in a water Cherenkov detector
- Author
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K. Abe, Y. Haga, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, S. Imaizumi, K. Iyogi, J. Kameda, Y. Kanemura, Y. Kataoka, Y. Kato, Y. Kishimoto, S. Miki, S. Mine, M. Miura, T. Mochizuki, S. Moriyama, Y. Nagao, M. Nakahata, T. Nakajima, Y. Nakano, S. Nakayama, T. Okada, K. Okamoto, A. Orii, K. Sato, H. Sekiya, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Tasaka, T. Tomura, K. Ueno, S. Watanabe, T. Yano, T. Yokozawa, S. Han, T. Irvine, T. Kajita, I. Kametani, K. Kaneyuki, K.P. Lee, T. McLachlan, K. Okumura, E. Richard, T. Tashiro, R. Wang, J. Xia, G.D. Megias, D. Bravo-Berguño, L. Labarga, B. Zaldivar, M. Goldhaber, F.d.M. Blaszczyk, J. Gustafson, C. Kachulis, E. Kearns, J.L. Raaf, J.L. Stone, L.R. Sulak, S. Sussman, L. Wan, T. Wester, B.W. Pointon, J. Bian, G. Carminati, M. Elnimr, N.J. Griskevich, W.R. Kropp, S. Locke, A. Renshaw, M.B. Smy, H.W. Sobel, V. Takhistov, P. Weatherly, K.S. Ganezer, B.L. Hartfiel, J. Hill, W.E. Keig, N. Hong, J.Y. Kim, I.T. Lim, R.G. Park, T. Akiri, B. Bodur, A. Himmel, Z. Li, E. O'Sullivan, K. Scholberg, C.W. Walter, T. Wongjirad, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, J. Imber, Th.A. Mueller, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J.S. Jang, K. Choi, J.G. Learned, S. Matsuno, S.N. Smith, J. Amey, L.H.V. Anthony, R.P. Litchfield, W.Y. Ma, D. Marin, A.A. Sztuc, Y. Uchida, M.O. Wascko, V. Berardi, M.G. Catanesi, R.A. Intonti, E. Radicioni, N.F. Calabria, G. De Rosa, L.N. Machado, G. Collazuol, F. Iacob, M. Lamoureux, N. Ospina, L. Ludovici, M. Gonin, G. Pronost, Y. Maekawa, Y. Nishimura, S. Cao, M. Friend, T. Hasegawa, T. Ishida, T. Ishii, M. Jakkapu, T. Kobayashi, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, T. Boschi, F. Di Lodovico, J. Migenda, S. Molina Sedgwick, M. Taani, S. Zsoldos, K.E. Abe, M. Hasegawa, Y. Isobe, Y. Kotsar, H. Miyabe, H. Ozaki, T. Shiozawa, T. Sugimoto, A.T. Suzuki, Y. Takeuchi, S. Yamamoto, A. Ali, Y. Ashida, C. Bronner, J. Feng, T. Hayashino, T. Hiraki, S. Hirota, K. Huang, M. Jiang, T. Kikawa, M. Mori, A. Murakami, KE. Nakamura, T. Nakaya, N.D. Patel, K. Suzuki, S. Takahashi, K. Tateishi, R.A. Wendell, K. Yasutome, P. Fernandez, N. McCauley, P. Mehta, A. Pritchard, K.M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, G. Mitsuka, M. Murase, F. Muto, T. Niwa, T. Suzuki, M. Tsukada, K. Frankiewicz, P. Mijakowski, J. Hignight, J. Jiang, C.K. Jung, X. Li, J.L. Palomino, G. Santucci, C. Vilela, M.J. Wilking, C. Yanagisawa, D. Fukuda, K. Hagiwara, M. Harada, T. Horai, H. Ishino, S. Ito, T. Kayano, A. Kibayashi, H. Kitagawa, Y. Koshio, W. Ma, T. Mori, H. Nagata, N. Piplani, S. Sakai, M. Sakuda, Y. Takahira, C. Xu, R. Yamaguchi, Y. Kuno, G. Barr, D. Barrow, L. Cook, A. Goldsack, S. Samani, C. Simpson, D. Wark, F. Nova, R. Tacik, J.Y. Yang, A. Cole, S.J. Jenkins, M. Malek, J.M. McElwee, O. Stone, M.D. Thiesse, L.F. Thompson, H. Okazawa, Y. Choi, S.B. Kim, I. Yu, A.K. Ichikawa, K. Ito, K. Nishijima, R.G. Calland, P. de Perio, K. Martens, M. Murdoch, M.R. Vagins, M. Koshiba, Y. Totsuka, K. Iwamoto, Y. Nakajima, N. Ogawa, Y. Suda, M. Yokoyama, D. Hamabe, S. Izumiyama, M. Kuze, Y. Okajima, M. Tanaka, T. Yoshida, M. Inomoto, M. Ishitsuka, H. Ito, R. Matsumoto, K. Ohta, M. Shinoki, J.F. Martin, C.M. Nantais, H.A. Tanaka, T. Towstego, R. Akutsu, M. Hartz, A. Konaka, N.W. Prouse, S. Chen, B.D. Xu, Y. Zhang, S. Berkman, S. Tobayama, K. Connolly, R.J. Wilkes, M. Posiadala-Zezula, D. Hadley, B. Richards, B. Jamieson, J. Walker, Ll. Marti, A. Minamino, G. Pintaudi, S. Sano, R. Sasaki, Abe, K., Haga, Y., Hayato, Y., Hiraide, K., Ieki, K., Ikeda, M., Imaizumi, S., Iyogi, K., Kameda, J., Kanemura, Y., Kataoka, Y., Kato, Y., Kishimoto, Y., Miki, S., Mine, S., Miura, M., Mochizuki, T., Moriyama, S., Nagao, Y., Nakahata, M., Nakajima, T., Nakano, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Sato, K., Sekiya, H., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Tasaka, S., Tomura, T., Ueno, K., Watanabe, S., Yano, T., Yokozawa, T., Han, S., Irvine, T., Kajita, T., Kametani, I., Kaneyuki, K., Lee, K. P., Mclachlan, T., Okumura, K., Richard, E., Tashiro, T., Wang, R., Xia, J., Megias, G. D., Bravo-Bergu??o, D., Labarga, L., Zaldivar, B., Goldhaber, M., Blaszczyk, F. d. M., Gustafson, J., Kachulis, C., Kearns, E., Raaf, J. L., Stone, J. L., Sulak, L. R., Sussman, S., Wan, L., Wester, T., Pointon, B. W., Bian, J., Carminati, G., Elnimr, M., Griskevich, N. J., Kropp, W. R., Locke, S., Renshaw, A., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Ganezer, K. S., Hartfiel, B. L., Hill, J., Keig, W. E., Hong, N., Kim, J. Y., Lim, I. T., Park, R. G., Akiri, T., Bodur, B., Himmel, A., Li, Z., O'Sullivan, E., Scholberg, K., Walter, C. W., Wongjirad, T., Bernard, L., Coffani, A., Drapier, O., El Hedri, S., Giampaolo, A., Imber, J., Mueller, Th. A., Paganini, P., Quilain, B., Ishizuka, T., Nakamura, T., Jang, J. S., Choi, K., Learned, J. G., Matsuno, S., Smith, S. N., Amey, J., Anthony, L. H. V., Litchfield, R. P., Ma, W. Y., Marin, D., Sztuc, A. A., Uchida, Y., Wascko, M. O., Berardi, V., Catanesi, M. G., Intonti, R. A., Radicioni, E., Calabria, N. F., De Rosa, G., Nascimento Machado, L., Collazuol, G., Iacob, F., Lamoureux, M., Ospina, N., Ludovici, L., Gonin, M., Pronost, G., Maekawa, Y., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Ishii, T., Jakkapu, M., Kobayashi, T., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Boschi, T., Di Lodovico, F., Migenda, J., Molina Sedgwick, S., Taani, M., Zsoldos, S., Abe, K. E., Hasegawa, M., Isobe, Y., Kotsar, Y., Miyabe, H., Ozaki, H., Shiozawa, T., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ali, A., Ashida, Y., Bronner, C., Feng, J., Hayashino, T., Hiraki, T., Hirota, S., Huang, K., Jiang, M., Kikawa, T., Mori, M., Murakami, A., Nakamura, Ke., Nakaya, T., Patel, N. D., Suzuki, K., Takahashi, S., Tateishi, K., Wendell, R. A., Yasutome, K., Fernandez, P., Mccauley, N., Mehta, P., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Mitsuka, G., Murase, M., Muto, F., Niwa, T., Suzuki, T., Tsukada, M., Frankiewicz, K., Mijakowski, P., Hignight, J., Jiang, J., Jung, C. K., Li, X., Palomino, J. L., Santucci, G., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Hagiwara, K., Harada, M., Horai, T., Ishino, H., Ito, S., Kayano, T., Kibayashi, A., Kitagawa, H., Koshio, Y., Ma, W., Mori, T., Nagata, H., Piplani, N., Sakai, S., Sakuda, M., Takahira, Y., Xu, C., Yamaguchi, R., Kuno, Y., Barr, G., Barrow, D., Cook, L., Goldsack, A., Samani, S., Simpson, C., Wark, D., Nova, F., Tacik, R., Yang, J. Y., Cole, A., Jenkins, S. J., Malek, M., Mcelwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Choi, Y., Kim, S. B., Yu, I., Ichikawa, A. K., Ito, K., Nishijima, K., Calland, R. G., de Perio, P., Martens, K., Murdoch, M., Vagins, M. R., Koshiba, M., Totsuka, Y., Iwamoto, K., Nakajima, Y., Ogawa, N., Suda, Y., Yokoyama, M., Hamabe, D., Izumiyama, S., Kuze, M., Okajima, Y., Tanaka, M., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Matsumoto, R., Ohta, K., Shinoki, M., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Akutsu, R., Hartz, M., Konaka, A., Prouse, N. W., Chen, S., Xu, B. D., Zhang, Y., Berkman, S., Tobayama, S., Connolly, K., Wilkes, R. J., Posiadala-Zezula, M., Hadley, D., Richards, B., Jamieson, B., Walker, J., Marti, Ll., Minamino, A., Pintaudi, G., Sano, S., and Sasaki, R.
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Physics - Instrumentation and Detectors ,Large detector systems for particle and astroparticle physics ,hep-ex ,Cherenkov detectors ,FOS: Physical sciences ,Acceleratorfysik och instrumentering ,Instrumentation and Detectors (physics.ins-det) ,Accelerator Physics and Instrumentation ,High Energy Physics - Experiment ,Subatomär fysik ,High Energy Physics - Experiment (hep-ex) ,Particle identification methods ,Neutrino detectors ,Subatomic Physics ,Cherenkov detectors Large detector systems for particle and astroparticle physics Neutrino detectors Particle identification methods ,Detectors and Experimental Techniques ,Astrophysics - Instrumentation and Methods for Astrophysics ,Instrumentation ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,physics.ins-det ,Mathematical Physics ,Particle Physics - Experiment ,astro-ph.IM - Abstract
We present the development of neutron-tagging techniques in Super-Kamiokande IV using a neural network analysis. The detection efficiency of neutron capture on hydrogen is estimated to be 26%, with a mis-tag rate of 0.016 per neutrino event. The uncertainty of the tagging efficiency is estimated to be 9.0%. Measurement of the tagging efficiency with data from an Americium-Beryllium calibration agrees with this value within 10%. The tagging procedure was performed on 3,244.4 days of SK-IV atmospheric neutrino data, identifying 18,091 neutrons in 26,473 neutrino events. The fitted neutron capture lifetime was measured as 218±9 μs. We present the development of neutron-tagging techniques in Super-Kamiokande IV using a neural network analysis. The detection efficiency of neutron capture on hydrogen is estimated to be 26%, with a mis-tag rate of 0.016 per neutrino event. The uncertainty of the tagging efficiency is estimated to be 9.0%. Measurement of the tagging efficiency with data from an Americium-Beryllium calibration agrees with this value within 10%. The tagging procedure was performed on 3,244.4 days of SK-IV atmospheric neutrino data, identifying 18,091 neutrons in 26,473 neutrino events. The fitted neutron capture lifetime was measured as 218 \pm 9 \mu s.
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- 2022
5. Search for neutrinos in coincidence with gravitational wave events from the LIGO–Virgo O3a observing run with the Super-Kamiokande detector
- Author
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Y. Kanemura, A. Giampaolo, W. R. Kropp, Y. Hayato, A. A. Sztuc, P. Mehta, Pablo Fernandez, T. Hasegawa, F. Iacob, D. Bravo-Berguño, Y. Kuno, T. Towstego, O. Drapier, H. Ito, Sei-ichiro Watanabe, G.D. Barr, J. Bian, N. Piplani, S. Miki, S. V. Cao, M. R. Vagins, K. Martens, Y. Takemoto, L. F. Thompson, S. Imaizumi, A. Coffani, O. Stone, J. S. Jang, M. Taani, Seiko Hirota, T. Kikawa, M. Gonin, J. Xia, Masahiro Kuze, A. Goldsack, S. Han, M. J. Wilking, R. A. Wendell, M. B. Smy, Junjie Jiang, F. Nova, E. Radicioni, Kimihiro Okumura, B. Zaldivar, J. Y. Kim, S. Izumiyama, A. Orii, S. Mine, L. Cook, J. Migenda, John Hill, A. T. Suzuki, K. Okamoto, T. Horai, R. Sasaki, J. F. Martin, J. Kameda, B. Bodur, Yuichi Oyama, T. Nakadaira, J. McElwee, J. L. Stone, I. T. Lim, F. Di Lodovico, D. L. Wark, Vincenzo Berardi, Y. Maekawa, S. El Hedri, T. Sekiguchi, L. Ludovici, Th. A. Mueller, N. Ospina, K. Ohta, G. De Rosa, Hiromasa Tanaka, V. Takhistov, Hiroaki Menjo, C. Simpson, J. G. Learned, K. M. Tsui, P. Mijakowski, J. Y. Yang, K. Abe, J. L. Raaf, M. Tsukada, M. Thiesse, K. Iwamoto, H. K. Tanaka, Yasunari Suzuki, S. Samani, G. D. Megias, A. Konaka, M. G. Catanesi, N. J. Griskevich, Y. Nishimura, David Hadley, F. d. M. Blaszczyk, M. Inomoto, S. Locke, Masaki Ishitsuka, M. Jakkapu, Yusuke Koshio, S. Sakai, D. Barrow, M. Lamoureux, P. Weatherly, P. de Perio, T. Boschi, T. Niwa, K. Nakamura, T. Yoshida, A. Pritchard, C. K. Jung, R. Matsumoto, M. Hartz, T. Shiozawa, C. Vilela, Ahmed Ali, M. Koshiba, Masato Shiozawa, H. Ozaki, T. Tashiro, S. Moriyama, S. Nakayama, R. Akutsu, L. H. V. Anthony, Hussain Kitagawa, S. J. Jenkins, B. Jamieson, R. G. Park, Song Chen, P. Paganini, M. Miura, Masayuki Nakahata, H. W. Sobel, Yuuki Nakano, Y. Uchida, B. D. Xu, Ll. Marti, Kate Scholberg, K. Hagiwara, Yutaka Nakajima, B. W. Pointon, D. Martin, Manabu Tanaka, K. Sato, G. Pintaudi, H. Okazawa, M. Ikeda, L. Wan, S. Molina Sedgwick, Hirokazu Ishino, Y. Kotsar, N. F. Calabria, Yuto Ashida, C. Yanagisawa, E. Kearns, C. Bronner, Masashi Yokoyama, Intae Yu, K. Yasutome, T. Nakamura, G. Collazuol, J. Walker, L. N. Machado, N. Ogawa, K. Nishijima, T. Wester, L. Bernard, T. Ishizuka, M. Harada, Tsuyoshi Nakaya, Y. Nagao, Atsushi Takeda, A. Minamino, Rongkun Wang, S. B. Kim, M. Shinoki, A. K. Ichikawa, N. McCauley, L. Labarga, T. Kobayashi, M. Malek, N. W. Prouse, B. Richards, T. Matsubara, S. Yamamoto, C. W. Walter, K. Sakashita, J. Feng, M. Posiadala-Zezula, W. Ma, B. Quilain, Hiroyuki Sekiya, Y. Kataoka, Y. Fukuda, Y. Takeuchi, T. Kajita, Takatomi Yano, M. Friend, M. Mori, Y. Sonoda, S. Sano, Yoshitaka Itow, G. Pronost, Shintaro Ito, S. Zsoldos, T. Tsukamoto, T. Okada, T. Ishida, A. Takenaka, UAM. Departamento de Física Teórica, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Super-Kamiokande, Abe, K., Bronner, C., Hayato, Y., Ikeda, M., Imaizumi, S., Kameda, J., Kanemura, Y., Kataoka, Y., Miki, S., Miura, M., Moriyama, S., Nagao, Y., Nakahata, M., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Watanabe, S., Yano, T., Han, S., Kajita, T., Okumura, K., Tashiro, T., Wang, R., Xia, J., Megias, G. D., Bravo-Berguno, D., Labarga, L., Marti, Ll., Zaldivar, B., Pointon, B. W., Blaszczyk, F. D. M., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Bernard, L., Coffani, A., Drapier, O., El Hedri, S., Giampaolo, A., Gonin, M., Mueller, Th. A., Paganini, P., Quilain, B., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Anthony, L. H. V., Martin, D. G. R., Sztuc, A. A., Uchida, Y., Berardi, V., Catanesi, M. G., Radicioni, E., Calabria, N. F., Nascimento Machado, L., de Rosa, G., Collazuol, G., Iacob, F., Lamoureux, M., Ospina, N., Ludovici, L., Maekawa, Y., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Jakkapu, M., Kobayashi, T., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Kotsar, Y., Nakano, Y., Ozaki, H., Shiozawa, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ali, A., Ashida, Y., Feng, J., Hirota, S., Kikawa, T., Mori, M., Nakaya, T., Wendell, R. A., Yasutome, K., Fernandez, P., Mccauley, N., Mehta, P., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Niwa, T., Sato, K., Tsukada, M., Mijakowski, P., Jiang, J., Jung, C. K., Vilela, C., Wilking, M. J., Yanagisawa, C., Hagiwara, K., Harada, M., Horai, T., Ishino, H., Ito, S., Koshio, Y., Kitagawa, H., Ma, W., Piplani, N., Sakai, S., Kuno, Y., Barr, G., Barrow, D., Cook, L., Goldsack, A., Samani, S., Simpson, C., Wark, D., Nova, F., Boschi, T., Di Lodovico, F., Migenda, J., Molina Sedgwick, S., Taani, M., Zsoldos, S., Yang, J. Y., Jenkins, S. J., Malek, M., Mcelwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Kim, S. B., Yu, I., Nishijima, K., Koshiba, M., Iwamoto, K., Nakajima, Y., Ogawa, N., Yokoyama, M., Martens, K., Vagins, M. R., Izumiyama, S., Kuze, M., Tanaka, M., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Matsumoto, R., Ohta, K., Shinoki, M., Martin, J. F., Tanaka, H. A., Towstego, T., Akutsu, R., Hartz, M., Konaka, A., de Perio, P., Prouse, N. W., Chen, S., Xu, B. D., Posiadala-Zezula, M., Hadley, D., Richards, B., Jamieson, B., Walker, J., Minamino, A., Pintaudi, G., Sano, S., Sasaki, R., and Ichikawa, A. K.
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Astrophysics ,KAMIOKANDE ,Neutrino Astronomy ,GeV ,01 natural sciences ,7. Clean energy ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,Neutrino astronomy Gravitational wave astronomy High energy astrophysics Black holes Compact objects Neutron stars Transient sources ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,LIGO ,010303 astronomy & astrophysics ,QC ,QB ,Physics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,energy: emission ,Black holes ,Neutrino ,Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Instrumentation and Methods for Astrophysics ,High energy astrophysics ,High-energy astronomy ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Gravitational-wave astronomy ,Neutron stars ,neutrino: spectrum ,0103 physical sciences ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Compact objects ,flavor ,010308 nuclear & particles physics ,Gravitational wave ,background ,gravitational radiation ,Física ,Astronomy and Astrophysics ,trigger ,Transient sources ,flux ,Neutron star ,VIRGO ,Space and Planetary Science ,High Energy Physics::Experiment ,Gravitational wave astronomy ,Neutrino astronomy ,Super-Kamiokande ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,statistical - Abstract
The Super-Kamiokande detector can be used to search for neutrinos in time coincidence with gravitational waves detected by the LIGO-Virgo Collaboration (LVC). Both low-energy ($7-100$ MeV) and high-energy ($0.1-10^5$ GeV) samples were analyzed in order to cover a very wide neutrino spectrum. Follow-ups of 36 (out of 39) gravitational waves reported in the GWTC-2 catalog were examined; no significant excess above the background was observed, with 10 (24) observed neutrinos compared with 4.8 (25.0) expected events in the high-energy (low-energy) samples. A statistical approach was used to compute the significance of potential coincidences. For each observation, p-values were estimated using neutrino direction and LVC sky map ; the most significant event (GW190602_175927) is associated with a post-trial p-value of $7.8\%$ ($1.4\sigma$). Additionally, flux limits were computed independently for each sample and by combining the samples. The energy emitted as neutrinos by the identified gravitational wave sources was constrained, both for given flavors and for all-flavors assuming equipartition between the different flavors, independently for each trigger and by combining sources of the same nature., Comment: 16 pages, 5 figures. v2: adding corrections from The Astrophysical Journal review
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- 2021
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6. Vibrational characterization of electrospun nanofibrous scaffolds based on silk fibroin and poly(L-lactic acid) for biomedical applications
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TOZZI, SILVIA, TADDEI, PAOLA, ZUCCHERI, GIAMPAOLO, M. Tsukada, S. Tozzi, P. Taddei, G. Zuccheri, and M. Tsukada
- Abstract
Silk fibroin (SF) has been widely used in biomedical field for its high biocompatibility and mechanical properties. Scaffolds based on SF have been employed for tissue and bone regeneration. In this field electrospinning has proved an interesting and effective process for producing nanofibrous scaffolds usable for drug delivery, wound dressing, tissue engineering. Actually, the produced fibres have high specific surface area and high porosity with very small pore size. Therefore, the micro/nanofibres can simulate the extracellular matrix and enhance cell migration and proliferation. On the other hand, in the biomedical field, a single material hardly fulfills all the requirements of a specific biological function. Therefore, composites are designed to properly modify and tailor the materials properties according to the desired function. A common strategy consists in the preparation of composite scaffolds made from a biodegradable synthetic polymer and a natural material. In this study, composite nanofibrous scaffolds were obtained by electrospinning a solution containing regenerated Bombyx mori SF and poly(L-lactic acid) (PLLA) in a 1:1 weight ratio. Actually, PLLA is a biocompatible polymer used since a long time in many biomedical applications for its outstanding properties such as strength and controlled degradation. Optical and atomic force microscopy imaging has been employed to gather information on the length, thickness and weaving of the nanofibres in the material. Raman and IR spectroscopy have been employed to clarify the possible interactions between SF and PLLA in the composite scaffold and the structure modifications induced by these interactions. Raman and IR marker bands of the PLLA crystallinity were identified and their trend was followed as a function of the treatment. An analogous analysis was performed for the Raman and IR Amide modes of SF. The vibrational data showed that the electrospinning process caused a decrease in crystallinity in both SF and PLLA components, as also confirmed by thermoanalytical techniques such as Differential scanning calorimetry.
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- 2014
7. Raman study on the structural modifications of silk and wool fibres upon grafting with methacrylamide and styrene
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TOZZI, SILVIA, TADDEI, PAOLA, M. Tsukada, S. Tozzi, P. Taddei, and M. Tsukada
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fungi - Abstract
Wool keratin and silk fibroin are excellent biopolymers with outstanding properties that make them extremely valuable for biomedical and biotechnological applications. As proteins, fibroin and wool can be chemically modified at side chain groups of constituent amino acids, thus improving their properties according to the desired function. Among the chemical modifications techniques, graft copolymerization of vinyl monomers has been considered a powerful method to substantially improve some intrinsic fibre properties. Grafted fibres represent an interesting model for studying the possible structural changes induced by grafting and the interactions between the fibre matrix and the grafted polymer chains. In this study, wool and Bombyx mori and Anthaerea pernyi (Tussah) silk fibres were grafted with methacrylamide (MAA) and styrene (St) and were analysed by Raman spectroscopy to comparatively assess the reactivity of vinyl monomers towards silk fibroins and wool and to elucidate the interactions between fibres and polymers as well as the possible conformational changes caused by grafting. Upon grafting with both MAA and St, new bands (indicated with an asterisk, Figure 1) appeared with increasing intensity at increasing grafting yield. For B. mori and Tussah silk fibroin grafted with MAA, experimental and calculated spectra of the samples with the highest weight gains (97.6 and 71.4%, respectively) appeared different in several ranges, suggesting that silk fibroin and poly-MAA should be thermodynamically compatible rather than phase separated: intermolecular interactions seem to prevail and the changes in the niNH range indicated different H-bond interactions in the grafted samples. B. mori silk fibroin showed a conformational rearrangement towards a more disordered state. Conformational rearrangements seemed to involve poly-MAA as well, as suggested by the wavenumber shifts of some bands (indicated with a circle). Wool fibres showed less significant spectral changes, according to the lower grafting yield. With regards to grafting with St, experimental and calculated spectra showed less significant differences than after grafting with poly-MAA. No changes were observed in the niNH stretching range, suggesting the occurrence of interactions different from those observed with poly-MAA, probably of hydrophobic nature. The reactivity towards MAA and St was higher for B. mori and Tussah silk fibroin than for wool. Spectral changes reflected weight gain data. The spectroscopic marker that appeared the most useful to predict the MAA grafting yield was the I730/I644 intensity ratio; it was found to increase linearly with weight gain (R2 = 0.9). Analogous results were obtained for the I1602/I644 and I1002/I644 intensity ratios (St-grafting). Different interactions appeared to occur between the fibres and the two polymers.
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- 2014
8. Cascade and subcascade structure in fission neutron irradiated fcc metals and their correlation to fusion neutron irradiation
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Yuhki Satoh, H. Matsui, Toshimasa Yoshiie, and M Tsukada
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Nuclear and High Energy Physics ,Chemistry ,Astrophysics::High Energy Astrophysical Phenomena ,Nuclear Theory ,Atmospheric temperature range ,Fusion power ,Nuclear reactor ,Crystallographic defect ,Molecular physics ,Spectral line ,law.invention ,Nuclear physics ,Nuclear Energy and Engineering ,law ,General Materials Science ,Neutron ,Irradiation ,Nuclear Experiment ,Nucleon - Abstract
Thin foil specimens of Cu and Au were irradiated with fission neutrons at 285–295 K to neutron fluences of 7 × 10 21 n m −2 (>0.1 MeV), using the Kyoto University Reactor. The structure of cascades and subcascades was examined by fitting the experimentally observed distribution of vacancy-type defect clusters to the calculated primary recoil energy spectrum, and was compared directly with that for fusion neutron irradiation. In Cu, 70% of cascades consist of only one defect cluster and 2% of more than four clusters. This is in contrast to larger cascades produced by 14 MeV neutrons that contain more than 10 clusters and extend 60 nm in diameter. The subcascade energy was 18 and 15 keV for Cu and Au, respectively. These values are about 30–60% higher than those obtained for fusion neutron irradiation.
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- 2004
9. Vibrational study on the modifications induced by chemical and grafting agents in silk and wool fibres
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TADDEI, PAOLA, G. Freddi, M. Tsukada, M. BECUCCI, C. GELLINI, V. SCHETTINO, P. Taddei, G. Freddi, and M. Tsukada
- Subjects
fungi - Abstract
Wool keratin and silk fibroin are excellent biopolymers with outstanding properties that make them extremely valuable for biomedical and biotechnological applications. As proteins, fibroin and wool can be chemically modified at side chain groups of constituent amino acids, thus improving their properties according to the desired function. Among the chemical modifications techniques, graft copolymerization of vinyl monomers onto silk fibres has been considered a powerful method to substantially improve some intrinsic fibre properties. Grafted fibres represent an interesting model for studying the possible structural changes induced by grafting and the interactions between the fibre matrix and the grafted polymer chains. On the other hand, the reaction of selected chemical agents with fibres is a particularly attractive system that can be used to obtain effective and specific modifications of the fibrous substrate. Significant changes in the physical and chemical properties of the fibres can be obtained, avoiding some of the drawbacks that arise from graft-copolymerization of vinyl monomers and from the loading of the fibre with large amounts of polymer, which is often needed to obtain the desired effects. In the present study, IR and Raman spectroscopy has been used to comparatively analyse the reactivity of vinyl monomers (styrene, methacrylamide) and anhydrides (succinic and glutaric anhydrides) towards Bombyx mori and Antheraea pernyi silk fibroin, and wool. Several spectroscopic ratios were identified as markers of the extent of grafting/chemical modification, due to their rough proportionality to the fibre weight gain. Vibrational techniques have been widely recognized as valid tools for studying the secondary structure of polypeptides and proteins. The positions and relative intensities of the Amide I, II and III modes were evaluated to probe the possible occurrence of conformational rearrangements upon reaction. In wool, the Raman SS stretching region was investigated to gain insight into the conformational changes of the CC-S-S-CC system. In silk fibroin the I850/I830 Raman intensity ratio between the two Tyr bands at 850-830 cm-1 gave information on Tyr environment. Vibrational spectroscopy proved suitable for evaluating the reactivity of the analysed fibres towards the different agents; the observed differences can be explained in terms of the different composition of the fibres and accessibility of the amino acids potentially involvable in the reactions.
- Published
- 2010
10. Affinity towards sulphation of wool and silk fibres
- Author
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TADDEI, PAOLA, M. Tsukada, T. Arai, G. Freddi, P. Taddei, M. Tsukada, T. Arai, and G. Freddi
- Subjects
BOMBYX MORI SILK FIBROIN ,WOOL ,TUSSAH SILK ,SULPHATION ,fungi ,RAMAN SPECTROSCOPY - Abstract
Wool keratin and silk fibroin are excellent biopolymers with outstanding properties that make them extremely valuable in biomedicai field. Coatings are commonly applied to the surface of materials to improve their surface properties. The biocompatibility and non-immunogenicity of silk proteins should allow their application as coatings for biomedical implants, potentially as anticoagulants, and either promoters or inhibitors of cell adhesion. Incorporation of sulphate and sulphonate groups confers anticoagulant and anti-thrombogenic properties to polymers. In view of widening the biomedicai utility of natural polymers as biomaterials, here we present a comparative vibrational study on wool, B. morì and A. pernyi silk fibroin fibres sulphated with chlorosulphonic acid in pyridine, which is known to enhance the yield of sulphation. Our aim is to prepare sulphated fibres by keeping the intrinsic fibre properties and texture unchanged, using short reaction times (i.e. 3h). The fibres were analyzed by Attenuated Total Reflectance, ATR/FT-IR and FT-Raman spectroscopy to comparatively elucidate the affinity for sulphate groups, the mechanism and the mode of linkage, the amino acid side-chains involved, and the possible conformational changes caused by sulphation. Among the analysed samples, the vibrational spectra of sulphated wool fibres showed the most pronounced changes, suggesting the highest affinity towards sulphation. New bands in the 1300-1200 and 1100-900 cm-1 ranges were assigned to the formation of alkyl and aryl sulphate salts, sulphonamides, sulphoamines and covalent aryl-alkyl sulphates. Vibrational spectra revealed the occurrence of a certain fibre degradation as well as rearrangements with consequent changes in secondary structure, conformation of disulphide bridges and tyrosine environment. The amino acid residues mainly involved in sulphation were identified as serine, threonine, tyrosine and tryptophan. Upon sulphation, the IR and Raman spectra of B. mori silk fibroin fibres showed analogous changes although less pronounced than for wool fibres. No significant changes were detected for A. pernyi silk fibroin fibres: only slight conformational rearrangements were observed. The reactivity towards sulphation was found to decrease along the series: wool > B. mori silk fibroin > A. pernyi silk fibroin, in agreement with the weight gain measurements which decreased along the same series. These results can be explained in relation to the different composition of the analysed fibres. Wool fibres were characterised by the highest content of the potentially reactive sites; evidently, these groups had also a good accessibility for the sulphating agent.
- Published
- 2009
11. Chemical and physical properties of sulphated silk fabrics
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TADDEI, PAOLA, C. Arosio, P. Monti, M. Tsukada, T. Arai, G. Freddi, P. Taddei, C. Arosio, P. Monti, M. Tsukada, T. Arai, and G. Freddi
- Subjects
SULPHATED FABRICS ,THERMAL ANALYSIS ,fungi ,technology, industry, and agriculture ,CHLOROSULPHONIC ACID ,B. MORI SILK FIBROIN ,VIBRATIONAL SPECTROSCOPY - Abstract
Silk fabrics were treated with chlorosulphonic acid in pyridine for different times. The amount of sulfur bound to silk increased during the first 2 h of reaction and then reached a plateau. The amino acidic pattern of sulfated silk remained essentially unchanged for short reaction times (< or =2 h). Longer reaction times resulted in drastic changes in the concentration of Asp, Glu, and Tyr. Surface morphology and texture of silk fabrics changed upon sulfation. Warp and weft yarns became progressively thinner, and deposits of foreign material appeared on the fiber surface. Changes were more evident at longer reaction times (> or =2 h). Spectroscopic analyses performed by FT-IR and FT-Raman showed the appearance of new bands attributable to various vibrations of sulfated groups. The IR bands at 1049 and 1014 cm-1, due to organic sulfate salts, were particularly intense. Bands assigned to alkyl sulfates and sulfonamides appeared in the 1300-1180 cm-1 range. Organic covalent sulfates displayed a weak but distinct IR band at 1385 cm-1. Both IR and Raman spectra revealed that silk fibroin mainly bound sulfates through the hydroxyl groups of Ser and Tyr, while involvement of amines could not be proved. Changes observed in the amide I and II range indicated an increase of the degree of molecular disorder of sulfated silk. Accordingly, the I850/I830 intensity ratio between the two Tyr bands at 850-830 cm-1 increased from 1.41 to 1.52, indicating a more exposed state of Tyr residues in sulfated silk. TGA, DSC, and TG analyses showed that sulfated silk attained a higher thermal stability. A thermal transition attributable to sulfated silk fibroin fractions appeared at about 260 degrees C in the DSC thermograms.
- Published
- 2007
12. Chemically Modified Silk Fibroins for Biomedical Applications. Vibrational Studies
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TADDEI, PAOLA, P. Monti, A. Boschi, T. Arai, M. Tsukada, G. Freddi, PABLO C. SÁNCHEZ, P. Taddei, P. Monti, A. Boschi, T. Arai, M. Tsukada, and G. Freddi
- Subjects
SULPHATION ,fungi ,GRAFTING ,BIODEGRADATION ,macromolecular substances ,VIBRATIONAL SPECTROSCOPY ,SILK FIBROIN - Abstract
There is considerable interest in exploiting natural polymers processing to create high-performing, environmentally friendly polymers for a range of biomedical applications. Silk fibroin is a natural polymer spun by silkworms and spiders, commonly used as a textile fibre. Recent investigations have proposed silk fibroin as a good basic component for new biomedical material development. In particular, silk fibres have been considered as starting material for the preparation of various kinds of medical devices, such as polymer-hydroxyapatite composites for bone regeneration, wire-ropes for the substitution of the anterior cruciate ligament, novel silk-based sutures and protective gauzes for the treatment of skin burns with improved blood compatibility. Silk films, which can be prepared by casting an aqueous silk fibroin solution, are highly attractive for their permeability to oxygen and water vapour. Likewise fibres, films exhibit the ability to support cell adhesion and growth, and their use as scaffolds for skin and bone regeneration has been proposed. Being a protein, fibroin is susceptible to biological degradation and can be chemically modified at side-chain groups thus improving its properties according to the function. Our studies on the degradation behaviour of silk fibres and films exposed to different proteolytic enzymes allow to elucidate the mechanism by which the material interacts with the biological environment, and to characterise the functional properties of the polymer. On the other hand, the possibility of modifying silk fibroin by using a non-hydrolitic enzyme (tyrosinase) and chemical agents (chlorosulphonic acid or metal cations with EDTA or tannic acid) to obtain functionalised biomaterials was studied. Tyrosinase allowed to obtain an intermediate able to graft chitosan onto Bombyx mori silk fibroin; chlorosulphonic acid was used to introduce covalently bound sulphate groups which confer to fibroin anticoagulant and antiviral activity. The metal binding (Ag+, Cu2+ and Co2+), which was enhanced by chemically modifying the fibres with chelating agents able to coordinate metal ions (EDTA or tannic acid), impart antimicrobial activity on fibroin. This review points out the contribution that Raman and IR spectroscopy can give to the knowledge of the structural modifications related to the obtainment of functionalised biomaterials such as the reaction mechanisms, the interactions between molecules and the intermediate which can form.
- Published
- 2007
13. Vibrational spectroscopic study of sulfated silk proteins
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MONTI, PATRIZIA, TADDEI, PAOLA, G. Freddi, C. Arosio, M. Tsukada, T. Arai, P. Monti, G. Freddi, C. Arosio, M. Tsukada, T. Arai, and P. Taddei
- Subjects
fungi ,VIBRATIONAL SPECTROSCOPY ,SULFATED SILK PROTEINS - Abstract
Silk is a natural product mainly composed by two proteins: fibroin and sericin. Fibroin is the main component of silk fiber and sericin glues the fibroin filaments in the cocoon and in textile is removed by boiling in water (degumming process). Silk can be easily functionalized, and its structure and morphology modulated to match a wide range of working requirements. In recent years, the unique chemical, mechanical, and biological properties of silk have made this natural polymer a highly attractive candidate for the development of innovative biomedicai devices (i.e. scaffolds for tissue engineering). Recently Tamada has reported that sulfated silk proteins show anticoagulant activity like a sulfated natural polysaccharide such as heparin and Gotoh et al. have demonstrated that sulfated silk fìbroins have potential as antiviral material. Here we present an i.r. and Raman study on fibroin and sericin treated with chlorosulfonic acid in pyridine in order to elucidate the mode of linkage of sulfate groups and the amino acids involved as well as the possible conformational changes caused by sulfation. The trend of both IR and Raman spectra of sulfated silk fabrics showed that conformational changes occurred by effect of sulfation and revealed that fibroin covalently bound sulfate groups mainly through the hydroxyl groups of tyrosine and serine leading to the formation of sulfate salts. At higher sulfation rate the formation of organic covalent sulfates may be proved by the appearance of the IR band at 1385 cm-1. This result points out a possible cross-linking of fibroin chains and could explain the formation of an insoluble fraction during the sulfation reaction as reported by Tamada. The involvement of the amine groups of basic residues in the sulfation reaction is not easily detectable. Nevertheless, the increase in intensity of the Raman band at 1164 cm-1 may reasonably account for this. The same trend can be observed in the spectra of sericin. Due to the different amino acid composition and structural organization, sericin seems to react more than fibroin mainly through the hydroxyl groups of serine.
- Published
- 2006
14. New Horizons in Low-Dimensional Electron Systems : A Festschrift in Honour of Professor H. Kamimura
- Author
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H. Aoki, M. Tsukada, M. Schlüter, F.A. Lévy, H. Aoki, M. Tsukada, M. Schlüter, and F.A. Lévy
- Subjects
- Electronic structure, High temperature superconductors, Superconductivity, Clathrate compounds
- Abstract
In Bird of Passage by Rudolf Peierls, we find a paragraph in which he de scribes his Cambridge days in the 1930s: On these [relativistic field theory] problems my main contacts were Dirac, and the younger theoreticians. These included in particular Nevill (now Sir Nevill) Mott, perhaps the friendliest among many kind and friendly people we met then. Professor Kamimura became associated with Sir Rudolf Peierls in the 1950s, when he translated, with his colleagues, Peierls's 1955 textbook, Quantum Theory of Solids, into Japanese. This edition, to which Sir Rudolf himself contributed a preface, benefitted early generations of Japanese solid state physicists. Later in 1974/5, during a sabbatical year spent at the Cavendish Laboratory, Professor Kamimura met and began a long association with Sir Nevill Mott. In particular, they developed ideas for disordered systems. One of the outcomes is a paper coauthored by them on ESR-induced variable range hopping in doped semiconductors. A series of works on disordered systems, together with those on two-dimensional systems, have served as building blocks for Physics of Interacting Electrons in Disordered Systems, in the International Series of Monographs on Physics, coauthored by Aoki and published in 1989 by the Oxford University Press. Soon after Professor Kamimura obtained a D. Sc. in 1959 for the work on the ligand field theory under the supervision ofMasao Kotani, his strong con nections in the international physical community began when he worked at the Bell Telephone Laboratories in 1961/64.
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- 2012
15. Dynamical Processes and Ordering on Solid Surfaces : Proceedings of the Seventh Taniguchi Symposium, Kashikojima, Japan, September 10–14, 1984
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A. Yoshimori, M. Tsukada, A. Yoshimori, and M. Tsukada
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- Surfaces (Technology), Thin films, Condensed matter, Spectrum analysis, Physical chemistry
- Published
- 2012
16. In vitro biodegradation study of tussah (A.pernyi) silk fibroin films
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G. Freddi, A. Boschi, T. Arai, M. Tsukada, TADDEI, PAOLA, MONTI, PATRIZIA, G. Freddi, P. Taddei, P. Monti, A. Boschi, T. Arai, and M. Tsukada
- Subjects
IN VITRO BIODEGRADATION ,SILK ,DOFFERENTIAL SCANNING CALORIMETRY (DSC) ,VIBRATIONAL SPECTROSCOPY ,HIGH PERFORMANCE - Abstract
In this study, A. pernyi silk fibroin (Ap-SF) films were incubated with Protease Type XXI from Streptomyces griseus, at 37°C, to investigate the degradation behaviour in an in vitro model system. The enzyme-resistant fractions of Ap-SF films and the soluble peptides formed by proteolytic degradation were collected at specified times, from 1 to 17 days, and analyzed by high performance liquid chromatography (HPLC), differential scanning calorimetry (DSC), FT-Raman and FT-IR spectroscopy. Proteolysis resulted in extensive weight loss and progressive fragmentation of films, especially at long degradation times. A range of soluble peptides was formed by proteolysis. By HP-size exclusion chromatography it was found that their average molecular weight changed with the time of incubation. The chemical analysis of the enzyme-resistant fraction of Ap-SF films at different times of degradation indicated that the proteolytic attack preferentially occurred in the less ordered Gly-rich sequences, and that the Ala-rich crystalline regions of biodegraded films were enriched. Accordingly, DSC and spectroscopic results showed an enhancement of the crystalline character of the biodegraded films. From the behaviour of the most important thermal transitions it was deduced that the -helix domains probably represent the most enzyme-resistant fraction. The in vitro approach used in the present study seems a valid tool for studying the rate and mechanism of degradation of Ap-SF films and of other biopolymers of potential biomedical utility.
- Published
- 2005
17. Modern White Pigments: Their Identification by means of Noninvasive Ultraviolet, Visibile, and Infrared Fiber Optic Reflectance Spectroscopy
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M. Picollo, M. Bacci, D. Magrini, B. Radicati, G. Trumpy, M. Tsukada, and D. Kunzelman
- Subjects
FORS ,Spettroscopia ,Pigmenti ,indagini non invasive ,Arte moderna - Abstract
In the first half of the twentieth century, the chemical industry provided artists with a new white pigment, titanium white, in its two crystalline forms, anatase and rutile. These were utilized along with other common whites such as lead white, zinc white, and lithopone. The identification of these white pigments is of particular interest in regard to the evolution of their use in art. Ultraviolet (UV), visible and infrared (IR) fiber optic reflectance spectroscopy (FORS) is a noninvasive analytical technique that is appropriate for in situ pigment identification. It can also be a complementary method to other noninvasive techniques. In the present work, FORS results on modern white pigments (including kaolin from the canvas preparation) will be presented. These pigments can be positively identified by their reflectance spectra in the 270-1700 nm range. Indeed, zinc sulfide (specifically one of the lithopone compounds), zinc white, and titanium white (in both the anatase and rutile crystalline forms) are clearly identified in the 330-420 nm region, where their spectral slopes make it possible to unambiguously distinguish them. In addition to the UV and visible regions, the 1300-1600 nm range is considered. There, kaolin, together with lead white and gypsum, reveals characteristic absorption features due to the hydroxyl groups (from the first overtone of stretching-mode vibrations). Finally, several examples of FORS application on twentieth-century artworks are reported. The cases selected for investigation belong to three different collections, all located in Florence: the Self-Portrait Collection of the Galleria degli Uffizi; the Fondo Pasolini, Archivio Contemporaneo "Alessandro Bonsanti" of the Gabinetto Vieusseux; and the Iconographic Collection of the publishing house Giunti Editori S.p.A.
- Published
- 2007
18. Mechanical stress effect on imprint behavior of integrated ferroelectric capacitors
- Author
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Alexei Gruverman, Brian J. Rodriguez, Robert J. Nemanich, Jeffrey S. Cross, M. Tsukada, Alexander K. Tagantsev, and Angus I. Kingon
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Flexoelectricity ,Poling ,Piezoresponse force microscopy ,Stress-induced switching ,Ferroelectricity ,law.invention ,Stress (mechanics) ,Hysteresis ,Capacitor ,law ,Composite material ,Polarization (electrochemistry) ,Flexoelectric effect - Abstract
Stress-induced changes in the imprint and switching behavior of (111)-oriented Pb(Zr,Ti)O-3 (PZT)-based capacitors have been studied using piezoresponse force microscopy. Visualization of polarization distribution and d(33)-loop measurements in individual 1x1.5-mum(2) capacitors before and after stress application, generated by substrate bending, provided direct experimental evidence of stress-induced switching. Mechanical stress caused elastic switching in capacitors with the direction of the resulting polarization determined by the sign of the applied stress. In addition, stress application turned capacitors into a heavily imprinted state characterized by strongly shifted hysteresis loops and almost complete backswitching after application of the poling voltage. It is suggested that substrate bending generated a strain gradient in the PZT layer, which produced asymmetric lattice distortion with preferential polarization direction and triggered polarization switching due to the flexoelectric effect. Fujitsu Limited Swiss National Science Foundation Author has checked copyright AD 14/01/2014
- Published
- 2003
19. Chemical and Physical Properties of Sulfated Silk Fabrics.
- Author
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P. Taddei, C. Arosio, P. Monti, M. Tsukada, T. Arai, and G. Freddi
- Published
- 2007
- Full Text
- View/download PDF
20. Polarization Switching in (100)/(001) Oriented Epitaxial Pb(Zr, Ti)O3 Thin Films.
- Author
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M. Tsukada, H. Yamawaki, M. Kondo, J. S. Cross, and K. Kurihara
- Abstract
Abstract Thin films made of (100)/(001)-oriented Pb(Zr, Ti)O3 (PZT) were deposited by liquid-delivery metal-organic chemical vapor deposition on Ir/MgAl2O4/SiO2/Si(100) substrates. For comparison, PZT thin films were also deposited on Ir/MgO(100) substrates. The X-ray F scan spectra for the (202) reflections revealed that the PZT films have four-fold symmetry. It indicates that the PZT films were epitaxially grown as a cube-on-cube structure on both substrates. The switchable polarization (Qsw) of the PZT capacitors on the silicon substrate was only 23 µ C/cm2 at 1.8 V; however, Qsw of PZT capacitors on MgO was 99 µ C/cm2. In the case of PZT films deposited on silicon, the volume fraction of (001)-oriented domains (which contribute to polarization switching) was 15.1% (calculated from an XRD pattern). This result is due to the lower Qsw of PZT capacitors on silicon. By piezoresponse-force microscopy, switchable and unswitchable domains could be identified by imaging color contrast, namely, (001) and (100) domains, respectively. Consequently, domain distribution of the PZT film on a silicon substrate indicates that the (001) domain exists in the (100) domain matrix. [ABSTRACT FROM AUTHOR]
- Published
- 2004
21. Preparation of metal-containing protein fibers and their antimicrobial properties.
- Author
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M. Tsukada, T. Arai, G. M. Colonna, A. Boschi, and G. Freddi
- Published
- 2003
22. Simulated non-contact AFM images of an alcohol molecule in an alkanethiol self-assembled monolayer.
- Author
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K Tagami and M Tsukada
- Subjects
- *
ATOMIC force microscopy , *ENERGY dissipation , *FORCE & energy , *SCANNING probe microscopy - Abstract
Based on all-atom empirical force field calculations, non-contact atomic force microscopy (nc-AFM) images are simulated of a self-assembled monolayer (SAM) of 1-hexanethiol (C6) in which a single 4-mercapto-1-butanol (C4OH) molecule is inserted. The tip is modelled by a carbon nanocone apex and the temperature is assumed to be 0 K. It is found that the C6molecules can be recognized individually in the topographic, frequency shift and energy dissipation images. In addition, the position of a H2O molecule, which is adsorbed by forming a hydrogen bond with the hydroxyl head group of the C4OH molecule, is observed more clearly in the energy dissipation image than in the topographic image. Furthermore, this H2O molecule is observed to be higher than the surrounding C6matrix in the topographic image, although the former is slightly lower than the latter. This can be explained by the enhancement of the normal force by an attractive electrostatic interaction between the water molecule and the tip apex. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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- View/download PDF
23. Visualizing the Submolecular Organization of αβ-Tubulin Subunits on the Microtubule Inner Surface Using Atomic Force Microscopy.
- Author
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Yurtsever A, Asakawa H, Katagiri Y, Takao K, Ikegami K, Tsukada M, Setou M, and Fukuma T
- Subjects
- Tubulin chemistry, Microscopy, Atomic Force methods, Microtubules chemistry, Microtubules ultrastructure
- Abstract
Microtubules (MTs) are dynamic cytoskeletal polymers essential for mediating fundamental cellular processes, including cell division, intracellular transport, and cell shape maintenance. Understanding the arrangement of tubulin heterodimers within MTs is key to their function. Using frequency modulation atomic force microscopy (FM-AFM) and simulations, we revealed the submolecular arrangement of α- and β-tubulin subunits on the inner MT surface. We observed an undulating molecular arrangement of protofilaments (PFs) with alternating height variations, attributed to different structural orientations and the confirmation of αβ-tubulin heterodimers in adjacent PFs, forming bimodal lateral contacts, as confirmed by AFM simulations. Structural defects resulting from missing tubulin units were directly identified. This detailed structural information provides critical insight into the MT functional properties. Our findings highlight the potential of FM-AFM in liquid as a powerful tool for elucidating the complex interactions among MTs, MT-associated proteins, and other molecules, which are essential for understanding MT dynamics in the cellular context.
- Published
- 2025
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24. Comparative Cost-Effectiveness of Atezolizumab Versus Durvalumab as First-Line Combination Treatment with Chemotherapy for Patients with Extensive-Disease Small-Cell Lung Cancer in Japan.
- Author
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Kashiwa M, Tsukada M, and Matsushita R
- Subjects
- Humans, Japan, Carboplatin therapeutic use, Carboplatin economics, Carboplatin administration & dosage, Etoposide economics, Etoposide therapeutic use, Etoposide administration & dosage, Male, Cost-Benefit Analysis, Antibodies, Monoclonal, Humanized economics, Antibodies, Monoclonal, Humanized therapeutic use, Antibodies, Monoclonal, Humanized administration & dosage, Antibodies, Monoclonal economics, Antibodies, Monoclonal therapeutic use, Antibodies, Monoclonal administration & dosage, Lung Neoplasms drug therapy, Lung Neoplasms economics, Small Cell Lung Carcinoma drug therapy, Small Cell Lung Carcinoma economics, Antineoplastic Combined Chemotherapy Protocols economics, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Antineoplastic Combined Chemotherapy Protocols administration & dosage, Quality-Adjusted Life Years
- Abstract
BACKGROUND AND OBJECTIVE: Recent trials have shown that immune checkpoint inhibitors (ICIs), atezolizumab and durvalumab, in combination with chemotherapy, are effective in treating extensive-disease small-cell lung cancer (ED-SCLC). However, owing to the expensiveness of ICIs, monetary issues arise. The cost-effectiveness of ICI combination treatment with carboplatin plus etoposide (CE) as first-line therapy for patients with ED-SCLC was examined to aid public health policy in Japan., Methods: IMpower 133 and CASPIAN data were used to create a partitioned survival model. Medical expenses and quality-adjusted life years (QALYs) were considered. The analysis period, discount rate, and threshold were set at 20 years, 2%, and 15 million Japanese yen (JPY) [114,068 US dollars (USD)] per QALY, respectively. The incremental cost-effectiveness ratio (ICER) was calculated by gathering reasonable parameters from published reports and combining the costs and effects using parametric models. Monte Carlo simulations, scenario analysis, and one-way sensitivity analyses were employed to quantify uncertainty., Results: After comparing atezolizumab plus CE (ACE) and durvalumab plus CE (DCE) with CE, it was found that the ICERs exceeded the threshold at 35,048,299 JPY (266,527 USD) and 36,665,583 JPY (278,826 USD) per QALY, respectively. For one-way sensitivity and scenario assessments, the ICERs exceeded the threshold, even with considerably adjusted parameters. For the probabilistic sensitivity analyses, there was no probability that the ICER of the ICI combination treatment with chemotherapy would fall below the threshold., Conclusion: ACE and DCE were not cost-effective compared with CE as first-line therapy for ED-SCLC in Japan. Both these therapies exhibited high ICERs., (© 2024. The Author(s).)
- Published
- 2024
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25. Health Information Seeking on the Internet Among Patients With and Without Cancer in a Region Affected by the 2011 Fukushima Triple Disaster: Cross-Sectional Study.
- Author
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Kaneda Y, Ozaki A, Murakami M, Sawano T, Nomura S, Bhandari D, Saito H, Tsubokura M, Yamaoka K, Nakata Y, Tsukada M, and Ohira H
- Abstract
Background: Health information seeking via the internet among patients with cancer in disaster-affected areas is underresearched., Objective: This study aims not only to assess the extent and means of web-based health information seeking among patients with cancer living in the disaster-affected area of the 2011 Fukushima triple disaster but also to compare these patterns with those without cancer, identifying distinct and shared factors influencing their web-based health information behaviors., Methods: We surveyed 404 patients (263 with and 141 without cancer) from the surgery department outpatient office at Minamisoma Municipal General Hospital, from October 2016 to January 2017. The survey included self-administered questions on internet and digital device use. Descriptive analyses were performed to examine the use patterns of digital devices and the internet and their impact on health information seeking across different age groups of patients with and without cancer. Multivariable logistic regression was used to examine factors associated with web-based health information seeking, stratifying by cancer diagnosis., Results: The proportion of participants who sought health information on the internet was comparable between patients with cancer and patients without cancer (19% vs 17.4%; P=.71). Digital device use varied significantly with age, with peak smartphone use occurring among the youngest cohorts for both groups. Multivariable logistic regression revealed that patients with cancer using smartphones or tablets daily were significantly more likely to gather web-based health information (odds ratio [OR] for smartphones 3.73, 95% CI 1.58-8.80; OR for tablets 5.08, 95% CI 1.27-20.35). Trust in institutional websites also significantly influenced web-based health information gathering among patients with cancer (OR 2.87, 95% CI 1.13-7.25). Conversely, among patients without cancer, unemployment was associated with a lower likelihood of seeking web-based health information (OR 0.26, 95% CI 0.08-0.85), whereas trust in both institutional and personal websites significantly increased this likelihood (OR for institutional websites 6.76, 95% CI 2.19-20.88; OR for personal websites 6.97, 95% CI 1.49-32.58)., Conclusions: This study reveals that a small proportion of both patients with cancer and patients without cancer engage in health information seeking via the internet, influenced by age, digital device use, and trust in institutional websites. Given the growing prevalence of digital literacy, strategies to enhance accessible and reliable web-based health information should be developed, particularly for patients with cancer in postdisaster settings. Future efforts should focus on tailored health communication strategies that address the unique needs of these populations., (©Yudai Kaneda, Akihiko Ozaki, Michio Murakami, Toyoaki Sawano, Shuhei Nomura, Divya Bhandari, Hiroaki Saito, Masaharu Tsubokura, Kazue Yamaoka, Yoshinori Nakata, Manabu Tsukada, Hiromichi Ohira. Originally published in JMIR Cancer (https://cancer.jmir.org), 21.08.2024.)
- Published
- 2024
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26. The outbreak of multispecies carbapenemase-producing Enterobacterales associated with pediatric ward sinks: IncM1 plasmids act as vehicles for cross-species transmission.
- Author
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Tsukada M, Miyazaki T, Aoki K, Yoshizawa S, Kondo Y, Sawa T, Murakami H, Sato E, Tomida M, Otani M, Kumade E, Takamori E, Kambe M, Ishii Y, and Tateda K
- Subjects
- Humans, Male, Infant, Enterobacteriaceae Infections epidemiology, Enterobacteriaceae Infections microbiology, Enterobacteriaceae Infections transmission, Whole Genome Sequencing, Child, Child, Preschool, Female, Klebsiella genetics, Klebsiella isolation & purification, Klebsiella drug effects, Infection Control methods, Carbapenem-Resistant Enterobacteriaceae genetics, Carbapenem-Resistant Enterobacteriaceae isolation & purification, Disease Outbreaks, Plasmids genetics, beta-Lactamases genetics, beta-Lactamases metabolism, Cross Infection epidemiology, Cross Infection microbiology, Cross Infection transmission, Bacterial Proteins genetics
- Abstract
Background: This study describes an outbreak caused by multispecies carbapenemase-producing Enterobacterales (CPE) occurring in a pediatric ward at an academic medical center in Tokyo., Methods: The index case involved a 1-year-old boy with Klebsiella variicola (CPE) detected in anal swabs in June 2016. The second case was Klebsiella quasipneumoniae (CPE) occurred in March 2017 followed by further spread, leading to the declaration of an outbreak in April 2017. Extensive environmental and patient microbiological sampling was performed. The relatedness of the isolates was determined using draft-whole-genome sequencing., Results: CPE surveillance cultures of patients and environments were positive in 19 patients and 9 sinks in the ward. The sinks in hospital rooms uninhabited by CPE patients exhibited no positive CPE-positive specimen during the outbreak. All CPE strains analyzed using draft-whole-genome sequencing harbored bla
IMP-1 , except for one harboring blaIMP-11 ; these strains harbored identical blaIMP-1 -carrying IncM1 plasmids. CPE was detected even after sink replacement; infection-control measures focused on sinks were implemented and the CPE outbreak ended after 7 months., Conclusions: Multiple bacterial species can become CPE via blaIMP-1 -carrying IncM1 plasmids of the same origin and spread through sinks in a hospital ward. Thorough infection-control measures implemented as a bundle might be crucial., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)- Published
- 2024
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- View/download PDF
27. Successful Treatment of Steroid-Refractory Immune Thrombocytopenia in a Patient Developing Multiple Myeloma While on Immune Checkpoint Inhibitor Therapy for Lung Cancer: A Case Report.
- Author
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Hayashi Y, Tsukada M, Shinoda D, Matsui M, Iwama K, Kajiwara K, and Yasuji K
- Abstract
Immune checkpoint inhibitor-related thrombocytopenia (irTCP) is a relatively rare immune-related adverse event (irAE); however, overall survival may worsen when it occurs. Prolonged use of high-dose steroids can diminish the effectiveness of immune checkpoint inhibitor (ICI) therapy on the primary disease because of T lymphocyte suppression, thus early tapering is necessary. We experienced a rare case of a 79-year-old male who concurrently developed irTCP and multiple myeloma (MM) during treatment with ICIs for lung adenocarcinoma. The patient exhibited severe thrombocytopenia and elevated serum IgA levels. Based on various tests, we diagnosed MM and irTCP. Despite administering the standard bortezomib plus dexamethasone (Bd therapy) treatment for MM, there was no response and the irTCP was steroid-resistant. Consequently, we administered a regimen including daratumumab (DPd therapy) for steroid-resistant irTCP and refractory MM, which resulted in a response. As a result, we were able to avoid prolonged use of high-dose steroids and the patient is stable without exacerbation of lung adenocarcinoma for 1 year and 5 months after the onset of MM. To our knowledge, there are no cases of MM developing during ICI treatment and this is the first case report in which daratumumab was effective for the treatment of irTCP., Competing Interests: The authors report no conflicts of interest in this work., (© 2024 Hayashi et al.)
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- 2024
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28. Screening using loop-mediated isothermal amplification (LAMP) assay and breeding of a Saccharomyces cerevisiae strain isolated from Muramatsu Park, Japan, for sake brewing.
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Kuribayashi T, Tsukada M, Asahi N, Kai SI, Abe KI, Kaneoke M, Oguma T, Kinebuchi J, Shigeno T, Sugiyama T, and Kasai D
- Abstract
Sake is a Japanese alcoholic beverage produced by fermenting steamed rice and koji (a culture of Aspergillus oryzae on steamed rice) with sake yeast, a strain of Saccharomyces cerevisiae. Sake yeast strains are important for maintaining product quality and process efficiency. In this study, a S. cerevisiae strain from Muramatsu Park, Gosen City, Niigata Prefecture was isolated using a loop-mediated isothermal amplification (LAMP) assay. The yeast strain was cultured using the mass spore-cell/cell-cell mating method with a sake yeast haploid. The resultant hybrid yeast strain, HG-3-F2, exhibited superior efficiency in alcoholic fermentation compared with the HG-3 strain. Our findings support the applicability of these original and mating strains in sake brewing., (2024, by The Mycological Society of Japan.)
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- 2024
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29. ARGONAUTE1-binding Tudor domain proteins function in small interfering RNA production for RNA-directed DNA methylation.
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Takei T, Tsukada M, Tamura K, Hara-Nishimura I, Fukao Y, Kurihara Y, Matsui M, Saze H, Tsuzuki M, Watanabe Y, and Hamada T
- Subjects
- Gene Expression Regulation, Plant, Tudor Domain genetics, DNA Transposable Elements genetics, RNA, Plant genetics, RNA, Plant metabolism, Mutation genetics, DNA Methylation genetics, Argonaute Proteins metabolism, Argonaute Proteins genetics, Arabidopsis Proteins genetics, Arabidopsis Proteins metabolism, Arabidopsis genetics, Arabidopsis metabolism, RNA, Small Interfering genetics, RNA, Small Interfering metabolism
- Abstract
Transposable elements (TEs) contribute to plant evolution, development, and adaptation to environmental changes, but the regulatory mechanisms are largely unknown. RNA-directed DNA methylation (RdDM) is 1 TE regulatory mechanism in plants. Here, we identified that novel ARGONAUTE 1 (AGO1)-binding Tudor domain proteins Precocious dissociation of sisters C/E (PDS5C/E) are involved in 24-nt siRNA production to establish RdDM on TEs in Arabidopsis thaliana. PDS5 family proteins are subunits of the eukaryote-conserved cohesin complex. However, the double mutant lacking angiosperm-specific subfamily PDS5C and PDS5E (pds5c/e) exhibited different developmental phenotypes and transcriptome compared with those of the double mutant lacking eukaryote-conserved subfamily PDS5A and PDS5B (pds5a/b), suggesting that the angiosperm-specific PDS5C/E subfamily has a unique function in angiosperm plants. Proteome and imaging analyses revealed that PDS5C/E interact with AGO1. The pds5c/e double mutant had defects in 24-nt siRNA accumulation and CHH DNA methylation on TEs. In addition, some lncRNAs that accumulated in the pds5c/e mutant were targeted by AGO1-loading 21-nt miRNAs and 21-nt siRNAs. These results indicate that PDS5C/E and AGO1 participate in 24-nt siRNA production for RdDM in the cytoplasm. These findings indicate that angiosperm plants evolved a new regulator, the PDS5C/E subfamily, to control the increase in TEs during angiosperm evolution., Competing Interests: Conflict of interest statement. None declared., (© The Author(s) 2024. Published by Oxford University Press on behalf of American Society of Plant Biologists. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)
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- 2024
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30. Analgesic Effect of the Kampo Formula Yokukansan via the Suppression of Substance P in an Experimental Rat Model of Hunner-Type Interstitial Cystitis.
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Tsunokawa Y, Tsukada M, Inoue T, Tamaoka M, Mugita T, Chuluunbat O, Maeda Y, Fukagai T, Ogawa Y, and Sunagawa M
- Abstract
Introduction: Yokukansan (YKS), a Kampo formula used in traditional Japanese medicine, has an analgesic effect, and is used for various pain disorders. This study investigated its analgesic effects on Hunner-type interstitial cystitis (HIC) and its mechanism of action in animal models. Methods: Rats with toll-like receptor-7 agonist (loxoribine)-induced HIC were used. Eight-week-old female Wistar rats were divided into three groups: control, HIC, and HIC-administered YKS (YKS + HIC). Bladder pain was assessed based on escape behavior using the von Frey test. Three days after HIC induction, the bladder and spinal cord were excised, and the expression of substance P (SP) was examined. Results: The pain threshold decreased significantly in the HIC group compared to that in the control group, but this decrease was suppressed by further YKS administration. The expression of SP in the bladder wall and spinal cord increased significantly in the HIC group compared to that in the control group; however, this increase was suppressed by YKS administration., Conclusion: SP is involved in the onset of bladder pain via neurokinin 1 receptors in bladder tissue. YKS may be useful for managing HIC-induced pain, and the suppression of SP secretion is one of its mechanisms of action., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2024, Tsunokawa et al.)
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- 2024
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31. Factors associated with return to play following conservative treatment for lumbar spondylolysis among young athletes: A retrospective case series using structural equation modeling.
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Tsukada M, Takiuchi T, and Ichinoseki-Sekine N
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- Female, Male, Humans, Latent Class Analysis, Retrospective Studies, Return to Sport, Athletes, Conservative Treatment, Low Back Pain therapy
- Abstract
Introduction: Lumbar spondylolysis is the most common underlying cause of lower back pain (LBP) in young athletes. Conservative treatment methods are often used to reduce pain and promote healing. Several parameters may affect the duration of conservative treatment, such as the time to return to play (RTP), patient behavior, and physical parameters; however, no study has comprehensively assessed the factors that affect the time to RTP., Objectives: This study aimed to determine the factors associated with the time required for RTP among young athletes with early-stage spondylolysis receiving conservative treatment using structural equation modeling (SEM)., Methods: In this retrospective case series, 137 young athletes (128 males and 9 females, aged 9-18 years) with early-stage lumbar spondylolysis were enrolled. All patients were examined using plain radiography and magnetic resonance imaging and treated conservatively (sports cessation, wearing a corset, therapeutic exercises, and low-intensity pulsed ultrasound radiation). SEM was used to investigate the factors affecting the time to RTP in these patients., Results: The final model included the following factors: spondylolysis laterality, symptom duration, lower-extremity flexibility, treatment interval, patient adherence, and residual LBP. SEM revealed that patient adherence to physician orders (p < 0.01), treatment interval (p < 0.001), and spondylolysis laterality (p < 0.001) contributed directly to shortened RTP., Conclusion: Patient adherence is essential for reducing the time to RTP among young athletes receiving conservative treatment for early-stage spondylolysis., Competing Interests: Declaration of competing interest The authors declare no potential conflicts of interest with respect to the research, authorship, or publication of this article., (Copyright © 2023 Elsevier Ltd. All rights reserved.)
- Published
- 2024
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32. Venous Hypertension Improved by a Viabahn Stent Graft Blocking Regurgitation to the Periphery of the Basilic Vein in an Elderly Patient Undergoing Hemodialysis: A Case Report.
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Shindo M, Hirotani S, Tsukada M, and Morishita M
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- Humans, Female, Aged, Aged, 80 and over, Graft Occlusion, Vascular diagnostic imaging, Graft Occlusion, Vascular etiology, Graft Occlusion, Vascular therapy, Vascular Patency, Constriction, Pathologic complications, Treatment Outcome, Renal Dialysis adverse effects, Stents adverse effects, Angioplasty, Balloon adverse effects, Angioplasty, Balloon methods, Arteriovenous Shunt, Surgical adverse effects, Arteriovenous Shunt, Surgical methods, Hypertension complications
- Abstract
Although necessary for hemodialysis (HD), arteriovenous grafts (AVG) frequently cause complications. Stenosis resulting in venous hypertension is a concern for physicians. Herein, we describe how venous hypertension was improved by using a Viabahn stent graft in an elderly HD patient. An 86-year-old woman started maintenance HD with a left-arm AVG. Two years later, she was referred to our hospital for treatment of juxta-graft-venous junction (GVJ) stenosis. Because of recurrence of stenosis at the juxta-GVJ, she underwent four percutaneous transluminal angioplasty (PTA) procedures during a period of 9 months. One month after the most recent PTA, the patient had redness, swelling, and pain in her left forearm. Venous hypertension was diagnosed on the basis of angiography findings showing regurgitation to the periphery of the basilic vein and juxta-GVJ stenosis. The stenosed juxta-GVJ was adequately expanded with a 7-mm balloon, and a 7-mm stent graft was inserted into the stenosis site. After successful treatment, there was no regurgitation to the periphery of the basilic vein and no symptoms. This complication should be considered when an AVG is created, because cutting off peripheral veins might prevent venous hypertension. Clinicians should perform regular postoperative monitoring.
- Published
- 2023
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33. Limitations and Future Aspects of Communication Costs in Federated Learning: A Survey.
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Asad M, Shaukat S, Hu D, Wang Z, Javanmardi E, Nakazato J, and Tsukada M
- Abstract
This paper explores the potential for communication-efficient federated learning (FL) in modern distributed systems. FL is an emerging distributed machine learning technique that allows for the distributed training of a single machine learning model across multiple geographically distributed clients. This paper surveys the various approaches to communication-efficient FL, including model updates, compression techniques, resource management for the edge and cloud, and client selection. We also review the various optimization techniques associated with communication-efficient FL, such as compression schemes and structured updates. Finally, we highlight the current research challenges and discuss the potential future directions for communication-efficient FL.
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- 2023
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34. Introduction and roll-out of self-learning App for midwifery during the COVID-19 pandemic and its sustainability in Cambodia.
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Nozaki I, Tsukada M, Sothy P, Rattana K, and Williams K
- Abstract
Similar to other countries, coronavirus disease (COVID-19) pandemic significantly impacted not only the ability of midwives to deliver high quality maternal care, but also their ability to access professional development opportunities, including in-service training in Cambodia. In response, we developed a Cambodian version of Safe Delivery App (SDA), aligned to Cambodia's clinical guidelines. The SDA is a free digital job aid and learning platform for skilled birth attendants developed by Maternity Foundation that works offline and is used in more than 40 countries after adapting to the country context. In the year and a half since its launch in June 2021, SDA has become established in Cambodia, with more than 3,000 people, accounting for nearly half the number of midwives in Cambodia, downloading and using it on their devices, and 285 people having completed its self-learning modules. The review of the introduction process revealed that publicity on the professional association's social networking sites, in-person in-depth hands-on training, and troubleshooting in a managed social networking group were useful in promoting the use of the application, and that the Continuing Professional Development Program accreditation has been a strong motivator for completing the self-study program. On the other hand, the COVID-19 pandemic has led to increased use of digital tools, but it is important to prevent the expansion of the digital divide when implementing new digital tools, including SDA., Competing Interests: The authors have no conflicts of interest to disclose., (2023, National Center for Global Health and Medicine.)
- Published
- 2023
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35. Radical Caging Strategy for Cholinergic Optopharmacology.
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Nakamura R, Yamazaki T, Kondo Y, Tsukada M, Miyamoto Y, Arakawa N, Sumida Y, Kiya T, Arai S, and Ohmiya H
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- Neurons, Molecular Structure, Cholinergic Agents, Acetylcholine, Neurotransmitter Agents chemistry
- Abstract
Photo-caged methodologies have been indispensable for elucidating the functional mechanisms of pharmacologically active molecules at the cellular level. A photo-triggered removable unit enables control of the photo-induced expression of pharmacologically active molecular function, resulting in a rapid increase in the concentration of the bioactive compound near the target cell. However, caging the target bioactive compound generally requires specific heteroatom-based functional groups, limiting the types of molecular structures that can be caged. We have developed an unprecedented methodology for caging/uncaging on carbon atoms using a unit with a photo-cleavable carbon-boron bond. The caging/uncaging process requires installation of the CH
2 -B group on the nitrogen atom that formally assembles an N -methyl group protected with a photoremovable unit. N -Methylation proceeds by photoirradiation via carbon-centered radical generation. Using this radical caging strategy to cage previously uncageable bioactive molecules, we have photocaged molecules with no general labeling sites, including acetylcholine, an endogenous neurotransmitter. Caged acetylcholine provides an unconventional tool for optopharmacology to clarify neuronal mechanisms on the basis of photo-regulating acetylcholine localization. We demonstrated the utility of this probe by monitoring uncaging in HEK cells expressing a biosensor to detect ACh on the cell surface, as well as Ca2+ imaging in Drosophila brain cells (ex vivo).- Published
- 2023
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36. Vibrational Study on the Structure, Bioactivity, and Silver Adsorption of Silk Fibroin Fibers Grafted with Methacrylonitrile.
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Di Foggia M, Tsukada M, and Taddei P
- Subjects
- Animals, Humans, Silver, Adsorption, Nitriles, Silk chemistry, Fibroins chemistry, Bombyx chemistry
- Abstract
Natural fibers have received increasing attention as starting materials for innovative applications in many research fields, from biomedicine to engineering. Bombyx mori silk fibroin has become a material of choice in the development of many biomedical devices. Grafting represents a good strategy to improve the material properties according to the desired function. In the present study, Bombyx mori silk fibroin fibers were grafted with methacrylonitrile (MAN) with different weight gains. The potential interest in biomedical applications of MAN functionalization relies on the presence of the nitrile group, which is an acceptor of H bonds and can bind metals. IR and Raman spectroscopy were used to characterize the grafted samples and the possible structural changes induced by grafting. Afterward, the same techniques were used to study the bioactivity (i.e., the calcium phosphate nucleation ability) of MAN-grafted silk fibroins after ageing in simulated body fluid (SBF) for possible application in bone tissue engineering, and their interaction with Ag
+ ions, for the development of biomaterials with enhanced anti-microbial properties. MAN was found to efficiently polymerize on silk fibroin through polar amino acids (i.e., serine and tryptophan), inducing an enrichment in silk fibroin-ordered domains. IR spectroscopy allowed us to detect the nucleation of a thin calcium phosphate layer and the uptake of Ag+ ions through the nitrile group, which may foster the application of these grafted materials in biomedical applications.- Published
- 2023
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37. Pi-Class Glutathione S-transferase (GSTP1)-Selective Fluorescent Probes for Multicolour Imaging with Various Cancer-Associated Enzymes.
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Fujikawa Y, Mori M, Tsukada M, Miyahara S, Sato-Fukushima H, Watanabe E, Murakami-Tonami Y, and Inoue H
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- Humans, Glutathione S-Transferase pi, Glutathione Transferase, Biomarkers, Tumor, Fluorescent Dyes, Neoplasms diagnostic imaging
- Abstract
Pi-class glutathione S-transferase (GSTP1) is highly expressed in a wide variety of human cancer tissues compared to the corresponding normal counterpart. Therefore, GSTP1 is a potential target enzyme for overcoming resistance to chemotherapeutic agents or visualizing specific lesions such as cancer. Here, we present orange and red fluorescence-emitting probes selective for GSTP1. Carbofluorescein and TokyoMagenta fluorophores were modified with a previously described GSTP1-selective chromogenic compound to generate orange and red fluorescence probes, respectively. Of these probes, Ps-CF, the orange fluorescence-emitting probe, was confirmed to be highly specific for detecting GSTP1 exogenously or endogenously expressed in various cancer cells. Additionally, it was demonstrated that Ps-CF is applicable for the simultaneous detection of GSTP1 and another cancer-associated enzyme by using a green fluorescence emitting γ-glutamyl transpeptidase (GGT) probe. In conclusion, the fluorescent probes developed in this study enable the simultaneous detection of multiple tumour markers such as GSTP1 with other cancer-associated enzymes by concurrently using spectrally distinguished fluorescent probes, potentially broadening the scope of cancer detection., (© 2022 Wiley-VCH GmbH.)
- Published
- 2022
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38. Infected aortic pseudoaneurysm caused by an inferior vena cava filter.
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Fukasawa H, Kameyama A, Tsukada M, and Imamura H
- Abstract
Background: Inferior vena cava filters are widely used to prevent pulmonary embolism, but they can cause serious complications., Case Presentation: A 45-year-old man with multiple abscesses was transferred to the emergency department from another hospital. Computed tomography revealed bilateral subscapular abscesses, septic pulmonary embolism, and an abdominal aortic pseudoaneurysm with an abscess at the site of the inferior vena cava filter limb inserted 12 years before. After admission to our hospital, surgical drainage of the bilateral subscapular and right wrist joint abscesses was performed; subsequent treatment with ampicillin improved the patient's condition. Inflammation resolved on the 19th hospitalization day, and abdominal aortic replacement surgery was performed. The patient's postoperative course was uneventful. He returned to the previous hospital for rehabilitation after 40 days of hospitalization., Conclusion: Inferior vena cava filters could cause serious complications., (© 2022 The Authors. Acute Medicine & Surgery published by John Wiley & Sons Australia, Ltd on behalf of Japanese Association for Acute Medicine.)
- Published
- 2022
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39. The Japanese Herbal Medicine Yokukansan Exerted Antioxidant and Analgesic Effects in an Experimental Rat Model of Hunner-Type Interstitial Cystitis.
- Author
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Inoue T, Tsukada M, Tsunokawa Y, Maeda Y, Fukuoka S, Fukagai T, Ogawa Y, and Sunagawa M
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- Animals, Antioxidants pharmacology, Antioxidants therapeutic use, Drugs, Chinese Herbal, Herbal Medicine, Humans, Japan, Pain, Rats, Cystitis, Interstitial drug therapy, Plants, Medicinal
- Abstract
Background and Objectives : The Japanese herbal medicine Yokukansan (YKS) has analgesic properties and is used for various pain disorders. The purpose of the present study was to investigate the effects of YKS in Hunner-type interstitial cystitis (HIC) using an experimental rat model of HIC and to explore its antioxidant activity and role as the underlying mechanism of action. Materials and Methods : The antioxidant capacity of YKS was evaluated by determining its hydroxyl radical (·OH) scavenging capacity using electron spin resonance (ESR). Next, the effects of YKS administration were explored using a toll-like receptor-7 agonist-induced rat model of HIC. The von Frey test was performed to assess bladder pain. Three days after HIC induction, the bladder was removed, and the expression of oxidative stress parameters in the bladder wall was investigated (reactive oxygen metabolites (ROMs), ·OH, and 8-hydroxy-2'-deoxyguanosine (8-OhdG)). Results : YKS had a ·OH scavenging capacity according to the ESR study. In the von Frey test, a significant decrease in the withdrawal threshold was observed in the HIC group compared with the control group; however, the decrease was ameliorated by the administration of YKS. Oxidative stress parameters showed increasing tendencies (ROMs test and 8-OHdG) or a significant increase (·OH) in the HIC group compared with the control group; however, the increase was significantly suppressed by the administration of YKS. Conclusions : These findings suggest that YKS is effective against HIC and that its antioxidant activity is involved in the mechanism of action.
- Published
- 2022
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40. Multimodal cortico-cortical associations induced by fear and sensory conditioning in the guinea pig.
- Author
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Tasaka G, Ide Y, Tsukada M, and Aihara T
- Abstract
Sensory cortices are defined by responses to physical stimulation in specific modalities. Recently, additional associatively induced responses have been reported for stimuli other than the main specific modality for each cortex in the human and mammalian brain. In this study, to investigate a type of consolidation, associative responses in the guinea pig cortices (auditory, visual, and somatosensory) were simultaneously measured using optical imaging after first- or second-order conditioning comprising foot shock as an aversive stimulus and tone and light as sensory stimuli. Our findings indicated that (1) after the first- and second-order conditioning, associative responses in each cortical area were additionally induced to stimulate the other specific modality; (2) an associative response to sensory conditioning with tone and light was also seen as a change in the response at the neuronal level without behavioral phenomena; and (3) when fear conditioning with light and foot shock was applied before sensory conditioning with tone and light, the associative response to foot shock in the primary visual cortex (V1) was decreased (extinction) compared with the response after the first-order fear conditioning, whereas the associative response was increased (facilitation) for fear conditioning after sensory conditioning. Our results suggest that various types of bottom-up information are consolidated as associative responses induced in the cortices, which are traced repetitively or alternatively by a change in plasticity involving facilitation and extinction in the cortical network. This information-combining process of cortical responses may play a crucial role in the dynamic linking of memory in the brain., (© The Author(s), under exclusive licence to Springer Nature B.V. 2021.)
- Published
- 2022
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41. Living Lab for Citizens' Wellness: A Case of Maintaining and Improving a Healthy Diet under the COVID-19 Pandemic.
- Author
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Tabata N, Tsukada M, Kubo K, Inoue Y, Miroku R, Odashima F, Shiratori K, Sekiya T, Sengoku S, Shiroyama H, and Kimura H
- Subjects
- Aged, Diet, Healthy, Humans, Laboratories, Pandemics prevention & control, SARS-CoV-2, COVID-19
- Abstract
The establishment and implementation of a healthy lifestyle is fundamental to public health and is an important issue for working-aged people, as it affects not only them but also the future generations. However, due to the COVID-19 pandemic and associated behavioural restrictions, lifestyles have altered, and, in certain environments, significantly worsened. In the present study, we conducted a project to improve the intestinal environment by focussing on the dietary habits of participants, utilising the living laboratory as a social technology to explore how to adapt to this drastic environmental change. We held eight workshops for voluntary participants and implemented a self-monitoring process of recording dietary behaviours (n = 78) and testing the intestinal environment (n = 14). Through this initiative, we developed a personalised wellness enhancement programme based on collaboration with multiple stakeholders and a framework for using personal data for research and practical purposes. These results provide an approach for promoting voluntary participation and behavioural changes among people, especially under the COVID-19 pandemic, as well as a practical basis for the government, academia, and industry to intervene effectively in raising people's awareness of health and wellness.
- Published
- 2022
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42. A case of Philadelphia chromosome-positive acute lymphocytic leukaemia with type I CD36 deficiency.
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Matsui M, Kajiwara K, Tsukada M, Iwama K, Yamada K, Kodo H, Seto K, Tonami K, Ando M, Matsuhashi M, Watanabe-Okochi N, Tsuno NH, and Kozai Y
- Subjects
- Female, Genetic Diseases, Inborn, Humans, Philadelphia Chromosome, Pregnancy, Blood Platelet Disorders, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Thrombocytopenia, Neonatal Alloimmune
- Abstract
Background: CD36 is a glycoprotein expressed on platelets and monocytes of the blood. There are two types of CD36 deficiency, type I and type II. Individuals with type I-deficiency do not express CD36 in any cell type and can produce the CD36 antibody, which causes pathological conditions, such as fetal/neonatal alloimmune thrombocytopenia (FNAIT) and platelet transfusion refractory (PTR), through antigenic exposure via transfusion or pregnancy., Case Presentation: We experienced a case of Philadelphia-positive acute lymphoblastic leukaemia with PTR. In addition to the CD36 antibody, multiple-specificity HLA antibodies were present in the patient's plasma, requiring transfusion of HLA-compatible and CD36-negative platelets (PC-HLA). Since the number of donors was limited, it was necessary to set-up a blood transfusion schedule so that hyper-fractionated cyclophosphamide, vincristine and doxorubicin therapy (hyper-CVAD) and ponatinib combination chemotherapy could be safely administered to achieve molecular remission. Rituximab administration resulted in reduced levels of both CD36 antibody and HLA antibody. Given the expression of CD36 on haematopoietic stem cells and the limited availability of CD36-negative PC-HLA, haematopoietic stem cell transplantation (HSCT) was not considered to be an option., Conclusion: If CD36-negative, allogeneic haematopoietic stem cell donors are unable to be found, the indications for HSCT in patients with type I CD36-deficiency should be carefully weighed. In the present case, molecular remission has been able to be maintained to the present day after completion of a two-year maintenance regimen., (© 2021 International Society of Blood Transfusion.)
- Published
- 2022
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43. Kampo Formulae for the Treatment of Neuropathic Pain ∼ Especially the Mechanism of Action of Yokukansan ∼.
- Author
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Sunagawa M, Takayama Y, Kato M, Tanaka M, Fukuoka S, Okumo T, Tsukada M, and Yamaguchi K
- Abstract
Kampo medicine has been practiced as traditional medicine (TM) in Japan. Kampo medicine uses Kampo formulae that are composed of multiple crude drugs to make Kampo formulae. In Japan, Kampo formulae are commonly used instead of or combined with Western medicines. If drug therapy that follows the guidelines for neuropathic pain does not work or cannot be taken due to side effects, various Kampo formulae are considered as the next line of treatment. Since Kampo formulae are composed of two or more kinds of natural crude drugs, and their extracts contain many ingredients with pharmacological effects, one Kampo formula usually has multiple effects. Therefore, when selecting a formula, we consider symptoms other than pain. This review outlines the Kampo formulae that are frequently used for pain treatment and their crude drugs and the basic usage of each component. In recent years, Yokukansan (YKS) has become one of the most used Kampo formulae for pain treatment with an increasing body of baseline research available. We outline the known and possible mechanisms by which YKS exerts its pharmacologic benefits as an example of Kampo formulae's potency and holistic healing properties., Competing Interests: MS received a research grant from Tsumura & Co. (Tokyo, Japan). The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Sunagawa, Takayama, Kato, Tanaka, Fukuoka, Okumo, Tsukada and Yamaguchi.)
- Published
- 2021
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44. Vibrational Study on Structure and Bioactivity of Protein Fibers Grafted with Phosphorylated Methacrylates.
- Author
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Di Foggia M, Tsukada M, and Taddei P
- Subjects
- Animals, Biocompatible Materials, Chemical Phenomena, Molecular Structure, Phosphorylation, Spectroscopy, Fourier Transform Infrared, Spectrum Analysis, Raman, Fibroins chemistry, Fibroins pharmacology, Keratins chemistry, Keratins pharmacology, Methacrylates chemistry, Silk chemistry, Wool chemistry
- Abstract
In the last decades, silk fibroin and wool keratin have been considered functional materials for biomedical applications. In this study, fabrics containing silk fibers from Bombyx mori and Tussah silk fibers from Antheraea pernyi , as well as wool keratin fabrics, were grafted with phosmer CL and phosmer M (commercial names, i.e., methacrylate monomers containing phosphate groups in the molecular side chain) with different weight gains. Both phosmers were recently proposed as flame retarding agents, and their chemical composition suggested a possible application in bone tissue engineering. IR and Raman spectroscopy were used to disclose the possible structural changes induced by grafting and identify the most reactive amino acids towards the phosmers. The same techniques were used to investigate the nucleation of a calcium phosphate phase on the surface of the samples (i.e., bioactivity) after ageing in simulated body fluid (SBF). The phosmers were found to polymerize onto the biopolymers efficiently, and tyrosine and serine underwent phosphorylation (monitored through the strengthening of the Raman band at 1600 cm
-1 and the weakening of the Raman band at 1400 cm-1 , respectively). In grafted wool keratin, cysteic acid and other oxidation products of disulphide bridges were detected together with sulphated residues. Only slight conformational changes were observed upon grafting, generally towards an enrichment in ordered domains, suggesting that the amorphous regions were more prone to react (and, sometimes, degrade). All samples were shown to be bioactive, with a weight gain of up to 8%. The most bioactive samples contained the highest phosmers amounts, i.e., the highest amounts of phosphate nucleating sites. The sulphate/sulphonate groups present in grafted wool samples appeared to increase bioactivity, as shown by the five-fold increase of the IR phosphate band at 1040 cm-1 .- Published
- 2021
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45. Potential association of prolonged patient interval and advanced anatomic stage in breast cancer patients in the area affected by the 2011 triple disaster in Fukushima, Japan: Retrospective observational study.
- Author
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Ozaki A, Toyoaki S, Tsukada M, Shimada Y, Kawamoto A, Wang JW, Bhandari D, Tsubokura M, and Ohira H
- Subjects
- Breast Neoplasms diagnosis, Breast Neoplasms etiology, Female, Humans, Incidence, Japan epidemiology, Middle Aged, Retrospective Studies, Stress, Psychological diagnosis, Time Factors, Breast Neoplasms epidemiology, Disasters, Fukushima Nuclear Accident, Neoplasm Staging, Stress, Psychological complications
- Abstract
Abstract: For five years after the 2011 triple disaster (earthquake, tsunami, and nuclear disaster) in Japan, the proportion of patients with undiagnosed symptomatic breast cancer remained elevated in the coastal area of Fukushima. These individuals experienced a prolonged interval from first symptom recognition to initial medical consultation (hereafter referred to as the patient interval). We aimed to investigate how this prolonged patient interval affected disease staging.Using patient records, we retrospectively extracted females with newly and pathologically diagnosed breast cancer who initially presented to Minamisoma Municipal General Hospital from March 2011 to March 2016. We estimated the proportion with advanced-stage disease (III, IV) according to the patient interval duration (<3 months, 3-12 months, and 12 months plus). A cut-off patient interval value was determined based on the previous evidence with regards to impacts on survival prospects. Logistic regression approaches were used to fulfill the study outcome.The proportion of patients with advanced-stage disease was 10.3% for < 3 months (7/68), 18.2% for 3-12 months (2/11), and 66.7% for more than 12 months (12/18). We found a similar trend using the multivariate logistic regression analyses.Prolongation of the patient interval was associated with advanced-stage disease among female patients with breast cancer., Competing Interests: Akihiko Ozaki receives personal fees from MNES Inc, outside the submitted work. Other authors did not declare any conflicts of interest., (Copyright © 2021 the Author(s). Published by Wolters Kluwer Health, Inc.)
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- 2021
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46. Kamikihito, a traditional Japanese Kampo medicine, increases the secretion of oxytocin in rats with acute stress.
- Author
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Tsukada M, Ikemoto H, Lee XP, Takaki T, Tsuchiya N, Mizuno K, Inoue T, Tsunokawa Y, Okumo T, Matsuyama T, and Sunagawa M
- Subjects
- Administration, Oral, Adrenocorticotropic Hormone blood, Animals, Behavior, Animal drug effects, Corticosterone blood, Defecation drug effects, Disease Models, Animal, Drugs, Chinese Herbal administration & dosage, Locomotion drug effects, Male, Medicine, Kampo methods, Paraventricular Hypothalamic Nucleus metabolism, Paraventricular Hypothalamic Nucleus ultrastructure, Rats, Wistar, Restraint, Physical adverse effects, Rats, Drugs, Chinese Herbal pharmacology, Oxytocin cerebrospinal fluid, Stress, Physiological drug effects
- Abstract
Ethnopharmacological Relevance: Kamikihito (KKT) is a Kampo medicine that is prescribed in Japan for the treatment of anemia, insomnia and mental anxiety in Japan. However, its precise mechanism of action remains unclear., Aim of the Study: This study aimed to evaluate the possible antistress effect of KKT in rats with acute stress and the contribution of oxytocin to the process., Materials and Methods: Acute immobilization stress (AIS; for 90 min) was used to assess the effect of KKT on acute stress. Male Wistar rats were orally treated with KKT. Parameters of stress were evaluated, and concentrations of oxytocin in plasma and cerebrospinal fluid (CSF) were measured., Results: AIS-induced defecation and fecal weight were significantly decreased because of treatment with KKT. The plasma levels of stress-related hormones following AIS were investigated. The pre-administration of KKT significantly increased adrenocorticotrophic hormone (ACTH) and corticosterone (CORT) levels following AIS. Conversely, there was no significant change in the plasma oxytocin level. Microdialysis and hydrophilic interaction liquid chromatography-tandem mass spectrometry (HILIC-MS/MS) were used to monitor the oxytocin secretion in CSF. Oxytocin level increased during AIS following the treatment of KKT. At 30 min after AIS, the level remained higher than before AIS. Furthermore, using an open field test, the locomotion (exploratory behavior) immediately after AIS was examined. The total traveled distance decreased after AIS; however, the decrease was significantly inhibited by the treatment of KKT. However, the effect of KKT was obstructed by the pre-administration of the oxytocin receptor antagonist., Conclusions: These results suggest that KKT has antistress activity and increased oxytocin secretion may be a mechanism underlying this phenomenon., (Copyright © 2021 The Author(s). Published by Elsevier B.V. All rights reserved.)
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- 2021
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47. Physiological properties of Cantor coding-like iterated function system in the hippocampal CA1 network.
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Fukushima Y, Yamaguti Y, Kuroda S, Aihara T, Tsuda I, and Tsukada M
- Abstract
Cantor coding provides an information coding scheme for temporal sequences of events. In the hippocampal CA3-CA1 network, Cantor coding-like mechanism was observed in pyramidal neurons and the relationship between input pattern and recorded responses could be described as an iterated function system. However, detailed physiological properties of the system in CA1 remain unclear. Here, we performed a detailed analysis of the properties of the system related to the physiological basis of learning and memory. First, we investigated whether the system could be simply based on a series of on-off responses of excitatory postsynaptic potential (EPSP) amplitudes. We applied a series of three spatially distinct input patterns with similar EPSP peak amplitudes. The membrane responses showed significant differences in spatial clustering properties related to the iterated function system. These results suggest that existence of some factors, which do not simply depend on a series of on-off responses but on spatial patterns in the system. Second, to confirm whether the system is dependent on the interval of sequential input, we applied spatiotemporal sequential inputs at several intervals. The optimal interval was 30 ms, similar to the physiological input from CA3 to CA1. Third, we analyzed the inhibitory network dependency of the system. After GABA
A receptor blocker (gabazine) application, quality of code discrimination in the system was lower under subthreshold conditions and higher under suprathreshold conditions. These results suggest that the inhibitory network increase the difference between the responses under sub- and suprathreshold conditions. In summary, Cantor coding-like iterated function system appears to be suitable for information expression in relation to learning and memory in CA1 network., Competing Interests: Conflict of interestThe authors declare that they have no conflict of interest., (© Springer Nature B.V. 2020.)- Published
- 2021
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48. Thermal stability of crown-motif [Au 9 (PPh 3 ) 8 ] 3+ and [MAu 8 (PPh 3 ) 8 ] 2+ (M = Pd, Pt) clusters: Effects of gas composition, single-atom doping, and counter anions.
- Author
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Matsuyama T, Kikkawa S, Fujiki Y, Tsukada M, Takaya H, Yasuda N, Nitta K, Nakatani N, Negishi Y, and Yamazoe S
- Abstract
The thermal behaviors of ligand-protected metal clusters, [Au
9 (PPh3 )8 ]3+ and [MAu8 (PPh3 )8 ]2+ (M = Pd, Pt) with a crown-motif structure, were investigated to determine the effects of the gas composition, single-atom doping, and counter anions on the thermal stability of these clusters. We successfully synthesized crown-motif [PdAu8 (PPh3 )8 ][HPMo12 O40 ] (PdAu8-PMo12) and [PtAu8 (PPh3 )8 ][HPMo12 O40 ] (PtAu8-PMo12) salts with a cesium-chloride-type structure, which is the same as the [Au9 (PPh3 )8 ][PMo12 O40 ] (Au9-PMo12) structure. Thermogravimetry-differential thermal analysis/mass spectrometry analysis revealed that the crown-motif structure of Au9-PMo12 was decomposed at ∼475 K without weight loss to form Au nanoparticles. After structural decomposition, the ligands were desorbed from the sample. The ligand desorption temperature of Au9-PMo12 increased under 20% O2 conditions because of the formation of Au nanoparticles and stronger interaction of the formed O=PPh3 than PPh3 . The Pd and Pt single-atom doping improved the thermal stability of the clusters. This improvement was due to the formation of a large bonding index of M-Au and a change in Au-PPh3 bonding energy by heteroatom doping. Moreover, we found that the ligand desorption temperatures were also affected by the type of counter anions, whose charge and size influence the localized Coulomb interaction and cluster packing between the cationic ligand-protected metal clusters and counter anions.- Published
- 2021
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49. Influences of Lavender Essential Oil Inhalation on Stress Responses during Short-Duration Sleep Cycles: A Pilot Study.
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Yogi W, Tsukada M, Sato Y, Izuno T, Inoue T, Tsunokawa Y, Okumo T, Hisamitsu T, and Sunagawa M
- Abstract
Lavender essential oil (LEO) was reported to improve sleep quality. We investigated the influence of aromatherapy by testing the effects of LEO on stress responses during a short-duration sleep in a single-blind, randomized, crossover trial. The subjects were twelve healthy adults who were nonsmokers without any known disease and who were not prescribed medications, and nine of these completed the study. After the subjects had fallen asleep, they were sprayed with LEO using an aroma diffuser. Before and after 90 min of sleep, α-amylase, chromogranin A (CgA), and cortisol levels in saliva were measured as objective stress indicators, and the Japanese version of the UWIST Mood Adjective Checklist was used as a subjective indicator. A comparison of changes before and after sleep, with and without LEO, revealed that the cortisol level did not significantly change; however, α-amylase ( p < 0.05) and CgA ( p < 0.01) levels significantly decreased after LEO inhalation. A mood test indicated no change in mood before and after sleep, with or without LEO. Since α-amylase and CgA reflect the sympathetic nervous system response, these results indicate that LEO aromatherapy during a short-duration sleep cycle suppresses the stress response, especially that of the sympathetic nervous system.
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- 2021
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50. Regulatory Role of Orexin in the Antistress Effect of "Press Tack Needle" Acupuncture Treatment.
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Fujiwara A, Tsukada M, Ikemoto H, Izuno T, Hattori S, Okumo T, Hisamitsu T, and Sunagawa M
- Abstract
The aim of this research was to investigate the antistress effect of press tack needle (PTN) acupuncture treatment using rats with social isolation stress (SIS). Rats were divided into non-stress group (Grouped+sham), stress group (SIS+sham), and PTN-treated SIS group (SIS+PTN). Rats in the SIS+PTN and SIS+sham groups were housed alone for eight days. For the SIS+PTN group, a PTN (length, 0.3 or 1.2 mm) was fixed on the GV20 acupoint on day 7. We measured stress behavior based on the time the rats showed aggressive behavior and the levels of plasma corticosterone and orexin A on day 8. In addition, the orexin-1 receptor or orexin-2 receptor antagonist was administered to rats that were exposed to SIS. The duration of aggressive behavior was significantly prolonged in the SIS+sham group, and the prolonged duration was inhibited in the SIS+PTN (1.2 mm) group. The levels of plasma corticosterone and orexin A were significantly increased in the SIS+sham group; however, these increases were inhibited in the SIS+PTN group. The aggressive behavior was significantly reduced after the orexin-2 receptor antagonist was administered. These findings suggest that PTN treatment at GV20 may have an antistress effect, and the control of orexin is a mechanism underlying this phenomenon.
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- 2021
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