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1. Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples

Author

Nakamura, T., primary, Matsumoto, M., additional, Amano, K., additional, Enokido, Y., additional, Zolensky, M. E., additional, Mikouchi, T., additional, Genda, H., additional, Tanaka, S., additional, Zolotov, M. Y., additional, Kurosawa, K., additional, Wakita, S., additional, Hyodo, R., additional, Nagano, H., additional, Nakashima, D., additional, Takahashi, Y., additional, Fujioka, Y., additional, Kikuiri, M., additional, Kagawa, E., additional, Matsuoka, M., additional, Brearley, A. J., additional, Tsuchiyama, A., additional, Uesugi, M., additional, Matsuno, J., additional, Kimura, Y., additional, Sato, M., additional, Milliken, R. E., additional, Tatsumi, E., additional, Sugita, S., additional, Hiroi, T., additional, Kitazato, K., additional, Brownlee, D., additional, Joswiak, D. J., additional, Takahashi, M., additional, Ninomiya, K., additional, Takahashi, T., additional, Osawa, T., additional, Terada, K., additional, Brenker, F. E., additional, Tkalcec, B. J., additional, Vincze, L., additional, Brunetto, R., additional, Aléon-Toppani, A., additional, Chan, Q. H. S., additional, Roskosz, M., additional, Viennet, J.-C., additional, Beck, P., additional, Alp, E. E., additional, Michikami, T., additional, Nagaashi, Y., additional, Tsuji, T., additional, Ino, Y., additional, Martinez, J., additional, Han, J., additional, Dolocan, A., additional, Bodnar, R. J., additional, Tanaka, M., additional, Yoshida, H., additional, Sugiyama, K., additional, King, A. J., additional, Fukushi, K., additional, Suga, H., additional, Yamashita, S., additional, Kawai, T., additional, Inoue, K., additional, Nakato, A., additional, Noguchi, T., additional, Vilas, F., additional, Hendrix, A. R., additional, Jaramillo-Correa, C., additional, Domingue, D. L., additional, Dominguez, G., additional, Gainsforth, Z., additional, Engrand, C., additional, Duprat, J., additional, Russell, S. S., additional, Bonato, E., additional, Ma, C., additional, Kawamoto, T., additional, Wada, T., additional, Watanabe, S., additional, Endo, R., additional, Enju, S., additional, Riu, L., additional, Rubino, S., additional, Tack, P., additional, Takeshita, S., additional, Takeichi, Y., additional, Takeuchi, A., additional, Takigawa, A., additional, Takir, D., additional, Tanigaki, T., additional, Taniguchi, A., additional, Tsukamoto, K., additional, Yagi, T., additional, Yamada, S., additional, Yamamoto, K., additional, Yamashita, Y., additional, Yasutake, M., additional, Uesugi, K., additional, Umegaki, I., additional, Chiu, I., additional, Ishizaki, T., additional, Okumura, S., additional, Palomba, E., additional, Pilorget, C., additional, Potin, S. M., additional, Alasli, A., additional, Anada, S., additional, Araki, Y., additional, Sakatani, N., additional, Schultz, C., additional, Sekizawa, O., additional, Sitzman, S. D., additional, Sugiura, K., additional, Sun, M., additional, Dartois, E., additional, De Pauw, E., additional, Dionnet, Z., additional, Djouadi, Z., additional, Falkenberg, G., additional, Fujita, R., additional, Fukuma, T., additional, Gearba, I. R., additional, Hagiya, K., additional, Hu, M. Y., additional, Kato, T., additional, Kawamura, T., additional, Kimura, M., additional, Kubo, M. K., additional, Langenhorst, F., additional, Lantz, C., additional, Lavina, B., additional, Lindner, M., additional, Zhao, J., additional, Vekemans, B., additional, Baklouti, D., additional, Bazi, B., additional, Borondics, F., additional, Nagasawa, S., additional, Nishiyama, G., additional, Nitta, K., additional, Mathurin, J., additional, Matsumoto, T., additional, Mitsukawa, I., additional, Miura, H., additional, Miyake, A., additional, Miyake, Y., additional, Yurimoto, H., additional, Okazaki, R., additional, Yabuta, H., additional, Naraoka, H., additional, Sakamoto, K., additional, Tachibana, S., additional, Connolly, H. C., additional, Lauretta, D. S., additional, Yoshitake, M., additional, Yoshikawa, M., additional, Yoshikawa, K., additional, Yoshihara, K., additional, Yokota, Y., additional, Yogata, K., additional, Yano, H., additional, Yamamoto, Y., additional, Yamamoto, D., additional, Yamada, M., additional, Yamada, T., additional, Yada, T., additional, Wada, K., additional, Usui, T., additional, Tsukizaki, R., additional, Terui, F., additional, Takeuchi, H., additional, Takei, Y., additional, Iwamae, A., additional, Soejima, H., additional, Shirai, K., additional, Shimaki, Y., additional, Senshu, H., additional, Sawada, H., additional, Saiki, T., additional, Ozaki, M., additional, Ono, G., additional, Okada, T., additional, Ogawa, N., additional, Ogawa, K., additional, Noguchi, R., additional, Noda, H., additional, Nishimura, M., additional, Namiki, N., additional, Nakazawa, S., additional, Morota, T., additional, Miyazaki, A., additional, Miura, A., additional, Mimasu, Y., additional, Matsumoto, K., additional, Kumagai, K., additional, Kouyama, T., additional, Kikuchi, S., additional, Kawahara, K., additional, Kameda, S., additional, Iwata, T., additional, Ishihara, Y., additional, Ishiguro, M., additional, Ikeda, H., additional, Hosoda, S., additional, Honda, R., additional, Honda, C., additional, Hitomi, Y., additional, Hirata, N., additional, Hayashi, T., additional, Hayakawa, M., additional, Hatakeda, K., additional, Furuya, S., additional, Fukai, R., additional, Fujii, A., additional, Cho, Y., additional, Arakawa, M., additional, Abe, M., additional, and Tsuda, Y., additional

Published
2023
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2. The Solar System calcium isotopic composition inferred from Ryugu samples

Author

Moynier, F., primary, Dai, W., additional, Yokoyama, T., additional, Hu, Y., additional, Paquet, M., additional, Abe, Y., additional, Aléon, J., additional, Alexander, C.M.O'D, additional, Amari, S., additional, Amelin, Y., additional, Bajo, K.-I., additional, Bizzarro, M., additional, Bouvier, A., additional, Carlson, R.W., additional, Chaussidon, M., additional, Choi, B.-G., additional, Dauphas, N., additional, Davis, A.M., additional, Di Rocco, T., additional, Fujiya, W., additional, Fukai, R., additional, Gautam, I., additional, Haba, M.K., additional, Hibiya, Y., additional, Hidaka, H., additional, Homma, H., additional, Hoppe, P., additional, Huss, G.R., additional, Ichida, K., additional, Iizuka, T., additional, Ireland, T.R., additional, Ishikawa, A., additional, Ito, M., additional, Itoh, S., additional, Kawasaki, N., additional, Kita, N.T., additional, Kitajima, K., additional, Kleine, T., additional, Komatani, S., additional, Krot, A.N., additional, Liu, M.-C., additional, Masuda, Y., additional, McKeegan, K.D., additional, Morita, M., additional, Motomura, K., additional, Nakai, I., additional, Nagashima, K., additional, Nesvorný, D., additional, Nguyen, A., additional, Nittler, L., additional, Onose, M., additional, Pack, A., additional, Park, C., additional, Piani, L., additional, Qin, L., additional, Russell, S.S., additional, Sakamoto, N., additional, Schönbächler, M., additional, Tafla, L., additional, Tang, H., additional, Terada, K., additional, Terada, Y., additional, Usui, T., additional, Wada, S., additional, Wadhwa, M., additional, Walker, R.J., additional, Yamashita, K., additional, Yin, Q.-Z., additional, Yoneda, S., additional, Young, E.D., additional, Yui, H., additional, Zhang, A.-C., additional, Nakamura, T., additional, Naraoka, H., additional, Noguchi, T., additional, Okazaki, R., additional, Sakamoto, K., additional, Yabuta, H., additional, Abe, M., additional, Miyazaki, A., additional, Nakato, A., additional, Nishimura, M., additional, Okada, T., additional, Yada, T., additional, Yogata, K., additional, Nakazawa, S., additional, Saiki, T., additional, Tanaka, S., additional, Terui, F., additional, Tsuda, Y., additional, Watanabe, S.-I., additional, Yoshikawa, M., additional, Tachibana, S., additional, and Yurimoto, H., additional

Published
2022
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3. Chemical and isotopic characterization of Asteroid Ryugu

Author

Yokoyama, T., Nagashima, K., Nakai, I., Young, E., Abe, Y., Aléon, J., Alexander, C., Amari, S., Amelin, Y., Bajo, K., Bizzarro, M., Bouvier, A., Carlson, R., Chaussidon, M., Choi, B., Dauphas, N., Davis, A., Rocco, T., Fujiya, W., Fukai, R., Gautam, I., Haba, M., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G., Ichida, K., Iizuka, T., Ireland, T., Ishikawa, A., Ito, M., Itoh, S., Kawasaki, N., Kita, N., Kitajima, K., Kleine, T., Komatani, S., Krot, A., Liu, M., Masuda, Y., McKeegan, K., Morita, M., Motomura, K., Moynier, F., Nguyen, A., Nittler, L., Onose, M., Pack, A., Park, C., Piani, L., Qin, L., Russell, S., Sakamoto, N., Schönbächler, M., Tafla, L., Tang, H., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R., Yamashita, K., Yin, Q., Yoneda, S., Yui, H., Zhang, A., Yurimoto, H., Tachibana, S., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Yabuta, H., Tsuda, Y., and Watanabe., S.

Published
2022

4. In-situ Oxygen and Manganese-Chromium Isotope studies of Ryugu: Implications to temperature and timing of aqueous activity

Author

Nagashima, K., Kawasaki, N., Sakamoto, N., Yokoyama, H., Yurimoto, T., Nakai, I., Young, E., Abe, Y., Aléon, J., Alexander, C., Amari, S., Amelin, Y., Bajo, K., Bizzarro, M., Bouvier, A., Carlson, R., Chaussidon, M., Choi, B., Dauphas, N., Davis, A., Rocco, T., Fujiya, W., Fukai, R., Gautam, I., Haba, M., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G., Ichida, K., Iizuka, T., Ireland, T., Ishikawa, A., Ito, M., Itoh, S., Kita, N., Kitajima, K., Kleine, T., Komatani, S., Krot, A., Liu, M., Masuda, Y., McKeegan, K., Morita, M., Motomura, K., Moynier, F., Nguyen, A., Nittler, L., Onose, M., Pack, A., Park, C., Piani, L., Qin, L., Russell, S., Schönbächler, M., Tafla, L., Tang, H., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R., Yamashita, K., Yin, Q., Yoneda, S., Yui, H., Zhang, A., and Yurimoto, H.

Published
2022

5. The Oxygen Isotopic Composition of Samples returned from, Asteroid Ryugu: Evidence for similarity to CI Chondrites

Author

Young, E., Tang, H., Tafla, L., Pack, A., Rocco, T., Yokoyama, T., Nagashima, K., Nakai, I., Abe, Y., ́Aleon, J., Alexander, C., Amari, S., Amelin, Y., Bajo, K., Bizzarro, M., Bouvier, A., Carlson, R., Chaussidon, M., Choi, B., Dauphas, N., Davis, A., Fujiya, W., Fukai, R., Gautam, I., Haba, M., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G., Ichida, K., Iizuka, T., Ireland, T., Ishikawa, A., Ito, M., Itoh, S., Kawasaki, N., Kita, N., Kitajima, K., Kleine, T., Komatani, S., Krot, A., Liu, M., Masuda, Y., McKeegan, K., Morita, M., Motomura, K., Moynier, F., Nguyen, A., Nittler, L., Onose, M., Park, C., Piani, L., Qin, L., Russell, S., Sakamoto, N., Schönbächler, M., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R., Yamashita, K., Yin, Q., Yoneda, S., Yui, H., Zhang, A., Yurimoto, H., Tachibana, S., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Yabuta, H., Tsuda, Y., and Watanabe, S.

Published
2022

6. Multi-Isotopic Analyses of Bulk Ryugu Samples returned by the Hayabusa2 Mission

Author

Yokoyama, T., Nagashima, K., Nakai, I., Young, E., Abe, Y., Aléon, J., Alexander, C., Amari, S., Amelin, Y., Bajo, K., Bizzarro, M., Bouvier, A., Carlson, R., Chaussidon, M., Choi, B., Dauphas, N., Davis, A., Rocco, T., Fujiya, W., Fukai, R., Gautam, I., Haba, M., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G., Ichida, K., Iizuka, T., Ireland, T., Ishikawa, A., Ito, M., Itoh, S., Kawasaki, N., Kita, N., Kitajima, K., Kleine, T., Komatani, S., Krot, A., Liu, M., Masuda, Y., McKeegan, K., Morita, M., Motomura, K., Moynier, F., Nguyen, A., Nittler, L., Onose, M., Pack, A., Park, C., Piani, L., Qin, L., Russell, S., Sakamoto, N., Schönbächler, M., Tafla, L., Tang, H., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R., Yamashita, K., Yin, Q., Yoneda, S., Yui, H., Zhang, A., Tachibana, H., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Yabuta, H., Yurimoto, H., Tsuda, Y., and Watanabe, S.

Published
2022

7. Sampling Mass and Chemical Heterogeneities Among Ryugu Samples Returned by the Hayabusa2 Mission

Author

Dauphas, N., Yokoyama, T., Nagashima, K., Nakai, I., Young, E., Abe, Y., Aléon, J., Alexander, C., Amari, S., Amelin, Y., Bajo, K., Bizzarro, M., Bouvier, A., Carlson, R., Chaussidon, M., Choi, B., Davis, A., Rocco, T., Fujiya, W., Fukai, R., Gautam, I., Haba, M., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G., Ichida, K., Iizuka, T., Ireland, T., Ishikawa, A., Ito, M., Itoh, S., Kawasaki, N., Kita, N., Kitajima, K., Kleine, T., Komatani, S., Krot, A., Liu, M., Masuda, Y., McKeegan, K., Morita, M., Motomura, K., Moynier, F., Nguyen, A., Nittler, L., Onose, M., Pack, A., Park, C., Piani, L., Qin, L., Russell, S., Sakamoto, N., Schönbächler, M., Tafla, L., Tang, H., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R., Yamashita, K., Yin, Q., Yoneda, S., Yui, H., Zhang, A., Yurimoto, H., Tachibana, S., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Yabuta, H., Tsuda, Y., and Watanabe, S.

Published
2022

8. The Solar System calcium isotopic composition inferred from Ryugu samples

Author

Moynier, F., Dai, W., Yokoyama, T., Hu, Y., Paquet, M., Abe, Y., Aleon, J., Alexander, C. M. O'D., Amari, S., Amelin, Y., Bajo, K.-I., Bizzarro, M., Bouvier, A., Carlson, R. W., Chaussidon, M., Choi, B.-G., Dauphas, N., Davis, A. M., Di Rocco, T., Fujiya, W., Fukai, R., Gautam, I., Haba, M. K., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G. R., Ichida, K., Iizuka, T., Ireland, T. R., Ishikawa, A., Ito, M., Itoh, S., Kawasaki, N., Kita, N. T., Kitajima, K., Kleine, T., Komatani, S., Krot, A. N., Liu, M.-C., Masuda, Y., McKeegan, K. D., Morita, M., Motomura, K., Nakai, I., Nagashima, K., Nesvorny, D., Nguyen, A., Nittler, L., Onose, M., Pack, A., Park, C., Piani, L., Qin, L., Russell, S. S., Sakamoto, N., Schönbächler, M., Tafla, L., Tang, H., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R. J., Yamashita, K., Yin, Q.-Z., Yoneda, S., Young, E. D., Yui, H., Zhang, A.-C., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Yabuta, H., Abe, M., Miyazaki, A., Nakato, A., Nishimura, M., Okada, T., Yada, T., Yogata, K., Nakazawa, S., Saiki, T., Tanaka, S., Terui, F., Tsuda, Y., Watanabe, S.-I., Yoshikawa, M., Tachibana, S., and Yurimoto, H.

Subjects
CHONDRITES, ELEMENT ABUNDANCES, METEORITES, Geochemistry and Petrology, MODAL MINERALOGY, FRACTIONATION, EARTH, Environmental Chemistry, Geology, CI, REFRACTORY INCLUSIONS
Abstract

CO CV CM CI Ryugu A Ryugu C 0.0 0.5 1.0 1.5 44/40CaSRM915a (age corrected) The Hayabusa2 spacecraft has returned samples from the Cb-type asteroid (162173) Ryugu to Earth. Previous petrological and chemical analyses support a close link between Ryugu and CI chondrites that are presumed to be chemically the most primitive meteorites with a solar-like composition. However, Ryugu samples are highly enriched in Ca compared to typical CI chondrites. To identify the cause of this discrepancy, here we report stable Ca isotopic data (expressed as delta 44/40CaSRM915a) for returned Ryugu samples collected from two sites. We found that samples from both sites have similar delta 44/40CaSRM915a (0.58 +/- 0.03 parts per thousand and 0.55 +/- 0.08 parts per thousand, 2 s.d.) that fall within the range defined by CIs. This isotopic similarity suggests that the Ca budget of CIs and Ryugu samples is dominated by carbonates, and the variably higher Ca contents in Ryugu samples are due to the abundant carbonates. Precipitation of carbonates on Ryugu likely coincided with a major episode of aqueous activity dated to have occurred similar to 5 Myr after Solar System formation. Based on the pristine Ryugu samples, the average delta 44/40CaSRM915a of the Solar System is defined to be 0.57 +/- 0.04 parts per thousand (2 s.d.).

Published
2022

9. Pneumothorax with coronavirus disease 2019 in non-ventilated patients: a single-center retrospective case series

Author

Nishida T, Aida Y, Nishiguchi S, H. Kashiwagi, kawachi j, Miyake K, Sunou Y, Ichita C, N. Isogai, Fukai R, Koyama H, T. Murata, R. Shimoyama, Yamagami H, Y. Igarashi, and Kamio T

Subjects
Series (stratigraphy), Pediatrics, medicine.medical_specialty, Pneumothorax, Coronavirus disease 2019 (COVID-19), business.industry, Medicine, business, Single Center, medicine.disease
Abstract

Of the 1061 patients of coronavirus disease-2019 admitted to our field hospital, eight patients (0.75%) had pneumothorax. The mean age of incidence was 79.9 years; six of these patients (75%) died. Although pneumothorax is a rare complication of coronavirus disease-2019, it suggests a poor prognosis in elderly patients.

Published
2021

16. Natural Radionuclides in the Environment

Author

Fukai, R., Yokoyama, Y., Hutzinger, Otto, editor, Bolle, H.-J., Fukai, R., de Leeuw, J. W., van der Ploeg, S. W. F., Rosswall, T., Schenck, P. A., Söderlund, R., Yokoyama, Y., and Zehnder, A. J. B.

Published
1982
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17. Genetic analysis of adult leukoencephalopathy patients using a custom‐designed gene panel

Author

Kunii, M., primary, Doi, H., additional, Ishii, Y., additional, Ohba, C., additional, Tanaka, K., additional, Tada, M., additional, Fukai, R., additional, Hashiguchi, S., additional, Kishida, H., additional, Ueda, N., additional, Kudo, Y., additional, Kugimoto, C., additional, Nakano, T., additional, Udaka, N., additional, Miyatake, S., additional, Miyake, N., additional, Saitsu, H., additional, Ito, Y., additional, Takahashi, K., additional, Nakamura, H., additional, Tomita‐Katsumoto, A., additional, Takeuchi, H., additional, Koyano, S., additional, Matsumoto, N., additional, and Tanaka, F., additional

Published
2018
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20. Confirmation of SLC5A7 ‐related distal hereditary motor neuropathy 7 in a family outside Wales

Author

Hamanaka, K., primary, Takahashi, K., additional, Miyatake, S., additional, Mitsuhashi, S., additional, Hamanoue, H., additional, Miyaji, Y., additional, Fukai, R., additional, Doi, H., additional, Fujita, A., additional, Imagawa, E., additional, Iwama, K., additional, Nakashima, M., additional, Mizuguchi, T., additional, Takata, A., additional, Miyake, N., additional, Takeuchi, H., additional, Tanaka, F., additional, and Matsumoto, N., additional

Published
2018
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26. The Natural Environment and the Biogeochemical Cycles

Author

Bolle, H.-J., primary, Fukai, R., additional, de Leeuw, J. W., additional, van der Ploeg, S. W. F., additional, Rosswall, T., additional, Schenck, P. A., additional, Söderlund, R., additional, Yokoyama, Y., additional, and Zehnder, A. J. B., additional

Published
1982
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31. Multimodal treatment for acute empyema based on the patient’s condition, including patients who are bedridden: A single center retrospective study

Author

Nishida Tomoki, Igarashi Yuto, Suno Yuma, Murata Takaaki, Miyake Katsunori, Isogai Naoko, Shimoyama Rai, Kawachi Jun, Kashiwagi Hiroyuki, Tsukiyama Toshitaka, and Fukai Ryuta

Subjects
Diseases of the respiratory system, RC705-779
Abstract

Background The incidence of acute empyema has increased in various countries; some elderly patients with acute empyema have contraindications for surgery under general anesthesia. Therefore, suitable management based on a patient's clinical condition is required. Methods We evaluated the different surgical and nonsurgical therapeutic approaches available for patients with acute empyema. This was a retrospective study of 57 patients with acute empyema who received treatment in our department between May 2015 and February 2019. For patients who did not initially improve with drainage or drainage combined with fibrinolytic therapy, surgery, or additional percutaneous drainage was performed based on their general condition. We compared several clinical factors pertaining to the patients who underwent surgical versus nonsurgical treatment. Results Our study showed that the patients with a performance status of 0--2 and an American Society of Anesthesiologists physical status classification of class II or lower underwent surgery safely without major operative complications. The combination of repeated drainage of the pleural cavity and fibrinolytic therapy appeared to be a reasonable nonsurgical management option for patients in poor overall condition. Conclusion For an aging population, we think that the combination of repeated pleural cavity drainage procedures and fibrinolytic therapy is a reasonable nonsurgical strategy for the management of patients with acute empyema.

Published
2021
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36. PROGRESS REPORT OF INITIAL DESCRIPTION OF INDIVIDUAL RYUGU PARTICLES RETURNED BY HAYABUSA2.

Author

Yada, T., Abe, M., Yogata, K., Miyazaki, A., Nagashima, K., Nakato, A., Hatakeda, K., Hitomi, Y., Sugiyama, Y., Nishimura, M., Sakamoto, K., Kanemaru, R., Kumagai, K., Soejima, H., Okada, T., Fukai, R., Ishizaki, T., Sugahara, H., Suzuki, S., and Sugita, S.

Subjects
VISIBLE spectra, COMPUTED tomography, LIGHT filters, NEAR-earth asteroids, ELECTRON microscopes, OPTICAL spectra, OPTICAL microscopes, INFRARED absorption
Abstract

Introduction: Hayabusa2 spacecraft returned samples from near-Earth C-type asteroid 162173 Ryugu to the Earth on 6 Dec. 2020 [1]. Since the samples had been returned, we continue describing individual Ryugu particles for their images, weights, visible and infrared spectra with the optical microscope Nikon SMZ1270i, the balance Mettler-Toledo XP404s, the monochronic digital microscope Kiralux CS895MU with six-bands filters for incident light, the FT-IR Jasco VIR-300 and the infrared microscope MicrOmega, respectively [1, 2]. So far, 404 individual Ryugu particles have been handpicked and described for all or some of the methods [3-11]. Surface morphologies and bulk densities of individual Ryugu particles: As mentioned in [3, 4], individual Ryugu particles have been grouped into angular or rounded in their shapes and smooth and rough in their morprologues. In total, those having rounded-shape (59%) and rough-surface (80%) are dominant in them. The relationship with their optical morphologies and surface mineralogizes were confirmed for the four individual Ryugu particles with an electron microscope [12], indicating those showing smooth surfaces showing space-weathering features on their surfaces. Although it is still poor in statistics, surface morphologies might reflect their mineralogical feature such as space weathering. Bulk densities of individual Ryugu particles were calculated based on the volume estimated from their three-dimensional size and to be 1283 ± 231 kg m-3 in an average of 156 individual Ryugu particles [1]. All the bulk densities of 404 individual Ryugu particles were plotted in the viewgraph of [4], showing the same tendency as reported in [1]. As pointed before, individual Ryugu particles vary from 500 to 2500 kg m-3 in bulk densities, indicating their porosities should vary largely from particles to particles, or errors in volume estimation are large [8]. More accurate volume evaluation such as three-dimensional imaging [8] or X-ray computed tomography [13] should be applied more for individual Ryugu particles to reveal their "real" bulk and grain densities. Infrared and visible reflectance spectra of individual Ryugu particles: So far, 244 of individual Ryugu particles have been analyzed for their infrared reflectance spectra with the FT-IR. 2.7µm absorption, corresponding to presence of -OH, have been detected from all of them, indicating ubiquitous presence of hydrous minerals in Ryugu samples. 3.4 µm absorption features, corresponding to presence of carbonate or -CH, have been detected from 48% of them. As pointed before [3], this should be partially due to their heterogeneous distribution of carbonate and/or organic components in them, and that the spectral feature in 3.4 µm is much weaker than 2.7 µm. It is difficult to detect spectral feature other than 2.7 µm for the particle comparable to or smaller than effective beam size of FT-IR, ~2 mm. The MicrOmega will help to detect minor spectral features from such small particles, even though there is limitation of number of analyses per day (2 individual particles per day). Visible spectra of individual Ryugu samples have been also analyzed with the digital microscope of muti-band filters [7]. The average spectrum of 69 individual Ryugu particles are comparable to that of bulk Ryugu samples, indicating there is no spectrally different particle among them. Due to the schedule of analyses, not all of the individual Ryugu particles have been analyzed for the visible spectra, but we should proceed the analysis to understand overall spectral features of Ryugu samples. Ryugu sample database and international announcement of opportunity (AO) for Ryugu samples: All the obtained initial description data shown above is open in public by the Ryugu Sample Database System (https://darts.isas.jaxa.jp/curation/hayabusa2/) [14]. The first international AO is ongoing based on this database, and the samples will be distributed to principal investigators of selected research proposals from this June (see detail in https://jaxa-ryugu-sample-ao.net/). Additionally, the second AO will be released in this summer. [ABSTRACT FROM AUTHOR]

Published
2022

40. P-704 Evaluation of right cervical and bilateral mediastinal lymph node dissection for NSCLC in the right upper lobe

Author

Miyamoto, Hideaki, primary, Wang, Z., additional, Fukai, R., additional, Futagawa, T., additional, Anami, Y., additional, Yamazaki, A., additional, Morio, A., additional, Sonobe, S., additional, Konno, H., additional, Takahashi, N., additional, Izumi, H., additional, Sakaguchi, H., additional, Ikeda, S., additional, and Hata, E., additional

Published
2003
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