2024/09/21 更新

写真a

ヤマナカ マサヒロ
山中 正博
YAMANAKA Masahiro
所属
惑星物質研究所 主任スーパーテクニシャン
職名
主任スーパーテクニシャン
外部リンク

学位

  • 博士(理学) ( 2013年3月   金沢大学 )

  • 博士 (理学) ( 2013年3月   金沢大学 )

  • 修士(理学) ( 2010年3月   金沢大学 )

  • 修士 (理学) ( 2010年3月   金沢大学 )

  • 学士(理学) ( 2008年3月   金沢大学 )

研究分野

  • ライフサイエンス / 分子生物学

学歴

  • 金沢大学   Graduate School of Natural Science and Technology   Division of Life Sciences

    2010年4月 - 2013年3月

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  • 金沢大学   Graduate School of Natural Science and Technology   Division of Biological Science

    2008年4月 - 2010年3月

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  • 金沢大学   Faculty of Science   Department of Biology

    2004年4月 - 2008年3月

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経歴

  • 岡山大学   惑星物質研究所   主任スーパーテクニシャン

    2013年4月 - 現在

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論文

  • Unraveling the Cr Isotopes of Ryugu: An Accurate Aqueous Alteration Age and the Least Thermally Processed Solar System Material

    Ryoji Tanaka, Dilan M. Ratnayake, Tsutomu Ota, Noah Miklusicak, Tak Kunihiro, Christian Potiszil, Chie Sakaguchi, Katsura Kobayashi, Hiroshi Kitagawa, Masahiro Yamanaka, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Eizo Nakamura

    The Astrophysical Journal   965 ( 1 )   52 - 52   2024年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Astronomical Society  

    Abstract

    The analysis of samples returned from the C-type asteroid Ryugu has drastically advanced our knowledge of the evolution of early solar system materials. However, no consensus has been obtained on the chronological data, which is important for understanding the evolution of the asteroid Ryugu. Here, the aqueous alteration age of Ryugu particles was determined by the Mn–Cr method using bulk samples, yielding an age of 4.13 + 0.62/−0.55 Myr after the formation of Ca–Al-rich inclusions (CAI). The age corresponds to 4563.17 + 0.60/−0.67 Myr ago. The higher 55Mn/52Cr, ε 54Cr, and initial ε 53Cr values of the Ryugu samples relative to any carbonaceous chondrite samples implies that its progenitor body formed from the least thermally processed precursors in the outermost region of the protoplanetary disk. Despite accreting at different distances from the Sun, the hydrous asteroids (Ryugu and the parent bodies of CI, CM, CR, and ungrouped C2 meteorites) underwent aqueous alteration during a period of limited duration (3.8 ± 1.8 Myr after CAI). These ages are identical to the crystallization age of the carbonaceous achondirtes NWA 6704/6693 within the error. The ε 54Cr and initial ε 53Cr values of Ryugu and NWA 6704/6693 are also identical, while they show distinct Δ'17O values. This suggests that the precursors that formed the progenitor bodies of Ryugu and NWA 6703/6693 were formed in close proximity and experienced a similar degree of thermal processing in the protosolar nebula. However, the progenitor body of Ryugu was formed by a higher ice/dust ratio, than NWA6703/6693, in the outer region of the protoplanetary disk.

    DOI: 10.3847/1538-4357/ad276a

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    その他リンク: https://iopscience.iop.org/article/10.3847/1538-4357/ad276a/pdf

  • The Formation of a Rubble Pile Asteroid: Insights from the Asteroid Ryugu 査読

    Tsutomu Ota, Christian Potiszil, Katsura Kobayashi, Ryoji Tanaka, Hiroshi Kitagawa, Tak Kunihiro, Chie Sakaguchi, Masahiro Yamanaka, Eizo Nakamura

    Universe   2023年6月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/universe9060293

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  • Organic Matter in the Asteroid Ryugu: What We Know So Far 招待 査読

    Christian Potiszil, Masahiro Yamanaka, Chie Sakaguchi, Tsutomu Ota, Hiroshi Kitagawa, Tak Kunihiro, Ryoji Tanaka, Katsura Kobayashi, Eizo Nakamura

    Life   2023年6月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/life13071448

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  • Detection of Meteoritic Amino Acids in Extremely Small Sample Sizes: Implications for Sample Return Missions

    Christian Potiszil, Masahiro Yamanaka, Tsutomu Ota, Ryoji Tanaka, Katsura Kobayashi, Eizo Nakamura

    2023年3月

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    出版者・発行元:MDPI AG  

    Unmetamorphosed carbonaceous chondrites provide important information concerning the formation and evolution of organic matter, such as amino acids. However, terrestrial contamination remains a valid concern when investigating the organic inventory of meteorites that have fallen to Earth. Accordingly, JAXA’s Hayabusa2 and NASA’s OSIRIS-REx have been launched with the task of returning uncontaminated C-type asteroid material to Earth. The successful Hayabusa2 mission has a very limited sample size (5.4 g). Therefore, many conventional compound specific techniques will struggle to detect amino acids above detection limit with available sample amounts (~several mg to 10’s of mg) being much smaller than those typically used. Here a novel method utilizing ultrahigh performance liquid chromatography-Orbitrap-mass spectrometry is validated and applied to very small meteorite samples, thus providing an approach that can overcome the small sample size constraints of sample return missions. The method is highly sensitive, enabling the detection of amino acids in the carbonaceous chondrites Murchison (2.28 mg) and Orgueil (2.30 mg). Furthermore, quantitation was possible for many of the detected amino acids in Murchison and Orgueil. Using the data presented here, both the amino acid reservoirs of Murchison and Orgueil and the potential application of this method to sample return samples are discussed.

    DOI: 10.20944/preprints202302.0374.v2

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  • Insights into the formation and evolution of extraterrestrial amino acids from the asteroid Ryugu

    Christian Potiszil, Tsutomu Ota, Masahiro Yamanaka, Chie Sakaguchi, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Hiroshi Kitagawa, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Eizo Nakamura

    Nature Communications   14 ( 1 )   2023年3月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    Abstract

    All life on Earth contains amino acids and carbonaceous chondrite meteorites have been suggested as their source at the origin of life on Earth. While many meteoritic amino acids are considered indigenous, deciphering the extent of terrestrial contamination remains an issue. The Ryugu asteroid fragments (JAXA Hayabusa2 mission), represent the most uncontaminated primitive extraterrestrial material available. Here, the concentrations of amino acids from two particles from different touchdown sites (TD1 and TD2) are reported. The concentrations show that N,N-dimethylglycine (DMG) is the most abundant amino acid in the TD1 particle, but below detection limit in the other. The TD1 particle mineral components indicate it experienced more aqueous alteration. Furthermore, the relationships between the amino acids and the geochemistry suggest that DMG formed on the Ryugu progenitor body during aqueous alteration. The findings highlight the importance of aqueous chemistry for defining the ultimate concentrations of amino acids in primitive extraterrestrial samples.

    DOI: 10.1038/s41467-023-37107-6

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    その他リンク: https://www.nature.com/articles/s41467-023-37107-6

  • On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective

    Eizo NAKAMURA, Katsura KOBAYASHI, Ryoji TANAKA, Tak KUNIHIRO, Hiroshi KITAGAWA, Christian POTISZIL, Tsutomu OTA, Chie SAKAGUCHI, Masahiro YAMANAKA, Dilan M. RATNAYAKE, Havishk TRIPATHI, Rahul KUMAR, Maya-Liliana AVRAMESCU, Hidehisa TSUCHIDA, Yusuke YACHI, Hitoshi MIURA, Masanao ABE, Ryota FUKAI, Shizuho FURUYA, Kentaro HATAKEDA, Tasuku HAYASHI, Yuya HITOMI, Kazuya KUMAGAI, Akiko MIYAZAKI, Aiko NAKATO, Masahiro NISHIMURA, Tatsuaki OKADA, Hiromichi SOEJIMA, Seiji SUGITA, Ayako SUZUKI, Tomohiro USUI, Toru YADA, Daiki YAMAMOTO, Kasumi YOGATA, Miwa YOSHITAKE, Masahiko ARAKAWA, Atsushi FUJII, Masahiko HAYAKAWA, Naoyuki HIRATA, Naru HIRATA, Rie HONDA, Chikatoshi HONDA, Satoshi HOSODA, Yu-ichi IIJIMA, Hitoshi IKEDA, Masateru ISHIGURO, Yoshiaki ISHIHARA, Takahiro IWATA, Kosuke KAWAHARA, Shota KIKUCHI, Kohei KITAZATO, Koji MATSUMOTO, Moe MATSUOKA, Tatsuhiro MICHIKAMI, Yuya MIMASU, Akira MIURA, Tomokatsu MOROTA, Satoru NAKAZAWA, Noriyuki NAMIKI, Hirotomo NODA, Rina NOGUCHI, Naoko OGAWA, Kazunori OGAWA, Chisato OKAMOTO, Go ONO, Masanobu OZAKI, Takanao SAIKI, Naoya SAKATANI, Hirotaka SAWADA, Hiroki SENSHU, Yuri SHIMAKI, Kei SHIRAI, Yuto TAKEI, Hiroshi TAKEUCHI, Satoshi TANAKA, Eri TATSUMI, Fuyuto TERUI, Ryudo TSUKIZAKI, Koji WADA, Manabu YAMADA, Tetsuya YAMADA, Yukio YAMAMOTO, Hajime YANO, Yasuhiro YOKOTA, Keisuke YOSHIHARA, Makoto YOSHIKAWA, Kent YOSHIKAWA, Masaki FUJIMOTO, Sei-ichiro WATANABE, Yuichi TSUDA

    Proceedings of the Japan Academy, Series B   98 ( 6 )   227 - 282   2022年6月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Academy  

    DOI: 10.2183/pjab.98.015

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  • The trace element composition of chondrule constituents: Implications for sample return methodologies and the chondrule silicate reservoir

    Tak Kunihiro, Tsutomu Ota, Masahiro Yamanaka, Christian Potiszil, Eizo Nakamura

    METEORITICS & PLANETARY SCIENCE   2021年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    Sample return missions represent great opportunities to study terrestrially uncontaminated solar system materials. However, the size of returned samples will be limited, and thus, it is necessary to understand the most appropriate techniques to apply. Accordingly, the sensitivity of laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) and secondary ion mass spectrometry (SIMS) was compared through the analyses of trace elements in reference materials and the Allende CV3 chondrite. While the SIMS method was found to be more sensitive than the laser method toward all elements of interest, the LA-ICPMS appears to be more suitable in terms of precision for certain elements. Using both analytical techniques, we measured chemical composition of an Allende chondrule and its igneous rim. These data were used to understand the nature of the reservoir that interacted with the host chondrule during formation of its igneous rim. We find that the igneous rim is enriched in silica, alkalis, and rare earth elements compared to the host chondrule. We suggest that the igneous rim could be explained by melting of a mixture of the chondrule-like and REE-enriched CAI-like precursors that accreted on the surface of the host chondrule followed by gas-melt interaction with a silica- and alkali-rich gas. Alternatively, these observations could be interpreted as a result of interaction between the chondrule and the melt resulting from partial melting of a pre-existing planetesimal in the early stages of its differentiation.

    DOI: 10.1111/maps.13665

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    その他リンク: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/maps.13665

  • A Method to Suppress Isobaric and Polyatomic Interferences for Measurements of Highly Siderophile Elements in Desilicified Geological Samples

    Xiaoyu Zhou, Ryoji Tanaka, Masahiro Yamanaka, Chie Sakaguchi, Eizo Nakamura

    GEOSTANDARDS AND GEOANALYTICAL RESEARCH   43 ( 4 )   611 - 633   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    Sample decomposition using inverse aqua regia at elevated temperatures and pressures (e.g., Carius tube or high-pressure asher) is the most common method used to extract highly siderophile elements (HSEs: Ru, Rh, Pd, Re, Os, Ir, Pt and Au) from geological samples. Recently, it has been recognised that additional HF desilicification is necessary to better recover HSEs, potentially contained within silicate or oxide minerals in mafic samples, which cannot be dissolved solely by inverse aqua regia. However, the abundance of interfering elements tends to increase in the eluent when conventional ion-exchange purification procedures are applied to desilicified samples. In this study, we developed an improved purification method to determine HSEs in desilicified samples. This method enables the reduction of the ratios of isobaric and polyatomic interferences, relative to the measured intensities of HSE isotope masses, to less than a few hundred parts per million. Furthermore, the total procedural blanks are either comparable to or lower than conventional methods. Thus, this method allows accurate and precise HSE measurements in mafic and ultramafic geological samples, without the need for interference corrections. Moreover, the problem of increased interfering elements, such as Zr for Pd and Cr for Ru, is circumvented for the desilicified samples.

    DOI: 10.1111/ggr.12280

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    その他リンク: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ggr.12280

  • Hypervelocity collision and water-rock interaction in space preserved in the Chelyabinsk ordinary chondrite

    Eizo Nakamura, Tak Kunihiro, Tsutomu Ota, Chie Sakaguchi, Ryoji Tanaka, Hiroshi Kitagawa, Katsura Kobayashi, Masahiro Yamanaka, Yuri Shimaki, Gray E. Bebout, Hitoshi Miura, Tetsuo Yamamoto, Vladimir Malkovets, Victor Grokhovsky, Olga Koroleva, Konstantin Litasov

    PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES   95 ( 4 )   165 - 177   2019年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN ACAD  

    A comprehensive geochemical study of the Chelyabinsk meteorite reveals further details regarding its history of impact-related fragmentation and melting, and later aqueous alteration, during its transit toward Earth. We support an similar to 30 Ma age obtained by Ar-Ar method (Beard et al., 2014) for the impact-related melting, based on Rb-Sr isotope analyses of a melt domain. An irregularly shaped olivine with a distinct 0 isotope composition in a melt domain appears to be a fragment of a silicate-rich impactor. Hydrogen and Li concentrations and isotopic compositions, textures of Fe oxyhydroxides, and the presence of organic materials located in fractures, are together consistent with aqueous alteration, and this alteration could have pre-dated interaction with the Earth's atmosphere. As one model, we suggest that hypervelocity capture of the impact-related debris by a comet nucleus could have led to shock-wave-induced supercritical aqueous fluids dissolving the silicate, metallic, and organic matter, with later ice sublimation yielding a rocky rubble pile sampled by the meteorite.

    DOI: 10.2183/pjab.95.013

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  • Determination of Abundances of Fifty-Two Elements in Natural Waters by ICP-MS with Freeze-Drying Pre-concentration

    Que D. Hoang, Tak Kunihiro, Chie Sakaguchi, Masahiro Yamanaka, Hiroshi Kitagawa, Eizo Nakamura

    GEOSTANDARDS AND GEOANALYTICAL RESEARCH   43 ( 1 )   147 - 161   2019年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    To precisely determine the abundances of fifty-two elements found within natural water samples, with mass fractions down to fg g(-1) level, we have developed a method which combines freeze-drying pre-concentration (FDC) and isotope dilution internal standardisation (ID-IS). By sublimation of H2O, the sample solution was reduced to < 1/50 of the original volume. To determine element abundance with accuracy better than 10%, we found that for solutions being analysed by mass spectrometry the HNO3 concentration should be > 0.3 mol l(-1) to avoid hydrolysis. Matrix-affected signal suppression was not significant for the solutions with NaCl concentrations lower than 0.2 and 0.1 cg g(-1) for quadrupole ICP-MS and sector field ICP-MS, respectively. The recovery yields of elements after FDC were 97-105%. The detection limits for the sample solutions prepared by FDC were <= 10 pg g(-1), except for Na, K and Ca. Blanks prepared using FDC were at pg-levels, except for eleven elements (Na, Mg, Al, P, Ca, Mn, Fe, Co, Ni, Cu and Zn). The abundances of fifty-two elements in bottled drinking water were determined from five different geological sources with mass fractions ranging from the fg g(-1) to mu g g(-1) level with high accuracy.

    DOI: 10.1111/ggr.12245

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    その他リンク: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ggr.12245

  • ☑ 2013 Zoological Science / Purification and characterization of coacervate-forming cuticular proteins from papilio xuthus pupae

    Yamanaka Masahiro, Ishizaki Yumi, Nakagawa Taro, Taoka Azuma, Fukumori Yoshihiro

    Zoological science   30 ( 7 )   534 - 542   2013年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Zoological Society of Japan = 日本動物学会  

    The Papilio xuthus (Lepidoptera: Papilionidae) pupa expresses novel soluble proteins that undergo reversible temperature-dependent coacervate-formation. We purified two coacervate-forming proteins, PX-1 and PX-4, from the wings of pharate adults. PX-1 and PX-4 form coacervates upon warming. Transmission electron microscopy analysis revealed that these proteins assemble ordered bead-like ultrastructures. We cloned and sequenced PX-1 and PX-4 cDNAs. The PX-1 and PX-4 amino acid sequences contain many hydrophobic residues and show homologies to insect cuticular proteins. Moreover, when recombinant PX-1 and PX-4 were overexpressed in Escherichia coli, both recombinant proteins exhibited temperature-dependent coacervation. Furthermore, analyses of truncated mutants of PX-1 suggest that both the Val/Pro-rich region and Gly/lle-rich regions of PX-1 are involved in such coacervation. © 2013 Zoological Society of Japan.The Papilio xuthus (Lepidoptera: Papilionidae) pupa expresses novel soluble proteins that undergo reversible temperature-dependent coacervate-formation. We purified two coacervate-forming proteins, PX-1 and PX-4, from the wings of pharate adults. PX-1 and PX-4 form coacervates upon warming. Transmission electron microscopy analysis revealed that these proteins assemble ordered bead-like ultrastructures. We cloned and sequenced PX-1 and PX-4 cDNAs. The PX-1 and PX-4 amino acid sequences contain many hydrophobic residues and show homologies to insect cuticular proteins. Moreover, when recombinant PX-1 and PX-4 were overexpressed in Escherichia coli, both recombinant proteins exhibited temperature-dependent coacervation. Furthermore, analyses of truncated mutants of PX-1 suggest that both the Val/Pro-rich region and Gly/lle-rich regions of PX-1 are involved in such coacervation. © 2013 Zoological Society of Japan.

    DOI: 10.2108/zsj.30.534

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▼全件表示

講演・口頭発表等

  • ナミアゲハの蛹で見つかった温度感受性タンパク質

    日本生化学会北陸支部 第29回大会  2011年5月28日 

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共同研究・競争的資金等の研究

  • マルチ遷移金属安定同位体による生命活動痕跡探査法の開発

    研究課題/領域番号:23K17707  2023年06月 - 2026年03月

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

    田中 亮吏, 山中 正博

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    配分額:6240000円 ( 直接経費:4800000円 、 間接経費:1440000円 )

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