Researcher Information
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Research activity information
Papers
- Kenichiro Sugitani; Akizumi Ishida; Kohei Sasaki; Motoko Igisu; Minako Hashiguchi
Carbonaceous film-like microstructures from the ca. 3.0 Ga Farrel Quartzite in the Pilbara Craton, Western Australia: their biogenicity and implications for diversity of Archean biofilm builders
PRECAMBRIAN RESEARCH, 15 Jul. 2026
440
[Reviewed] - Kenichiro Sugitani; Kohei Sasaki; Akizumi Ishida; Motoko Igisu; Kaho Ishibashi; Mariko Yamamoto; Minako Hashiguchi; Heda Agic; Stanley M. Awramik
Morphology and C-isotopic composition affirm biogenicity of Mesoarchean sphaeromorph organic-walled microfossils from the ∼3.0 Ga Farrel Quartzite, Western Australia
PRECAMBRIAN RESEARCH, 01 Jun. 2026
437
[Reviewed] - Motoko Igisu; Kentaro Tanaka; Naoto Takahata; Ken Takai; Yuji Sano; Tsuyoshi Komiya
Reassessing early traces of life from the Eoarchean metasedimentary rocks in Labrador, Canada: carbon isotope compositions for individual graphitic grains
PRECAMBRIAN RESEARCH, 01 Jun. 2026
437
[Reviewed] - Chen Chen; Ruiqin Yi; Motoko Igisu; Rehana Afrin; Mahendran Sithamparam; Kuhan Chandru; Yuichiro Ueno; Linhao Sun; Tommaso Laurenzi; Ivano Eberini; Tommaso P. Fraccia; Anna Wang; H. James Cleaves; Tony Z. Jia
Primitive homochiral polyester formation driven by tartaric acid and calcium availability
Proceedings of the National Academy of Sciences, 21 Mar. 2025
122, 12
[Reviewed] - Chen Chen; Ruiqin Yi; Motoko Igisu; Chie Sakaguchi; Rehana Afrin; Christian Potiszil; Tak Kunihiro; Katsura Kobayashi; Eizo Nakamura; Yuichiro Ueno; André Antunes; Anna Wang; Kuhan Chandru; Jihua Hao; Tony Z Jia
Spectroscopic and Biophysical Methods to Determine Differential Salt-Uptake by Primitive Membraneless Polyester Microdroplets.
Small methods, Dec. 2023
7, 12, e2300119
[Reviewed] - Rintaro KIMURA; Kazutaka MANNEN; Hidenori KUMAGAI; Yohei MATSUI; Motoko IGISU; Yoshinori TAKANO
Origin Estimation of the Black Component of “Black Eggs” from Owakudani, Hakone Hot Springs, Japan
BUNSEKI KAGAKU, 05 Jul. 2023
72, 7.8, 249, 256
[Reviewed] - Motoko Igisu; Masayuki Miyazaki; Sanae Sakai; Satoshi Nakagawa; Hiroyuki D Sakai; Ken Takai
Domain-level Identification of Single Prokaryotic Cells by Optical Photothermal Infrared Spectroscopy.
Microbes and environments, 2023
38, 4
[Reviewed] - Imene Kerraouch; Yoko Kebukawa; Addi Bischoff; Michael E. Zolensky; Elias Wölfer; Jan L. Hellmann; Motoo Ito; Ashley King; Mario Trieloff; Jean-Alix Barrat; Phillipe Schmitt-Kopplin; Andreas Pack; Markus Patzek; Romy D. Hanna; Thomas Fockenberg; Yves Marrocchi; Marc Fries; Jérémie Mathurin; Emmanuel Dartois; Jean Duprat; Cécile Engrand; Ariane Deniset; Alexandre Dazzi; Kento Kiryu; Motoko Igisu; Takazo Shibuya; Daisuke Wakabayashi; Shohei Yamashita; Yasuo Takeichi; Yoshio Takahashi; Takuji Ohigashi; Yu Kodama; Masashi Kondo
Heterogeneous nature of the carbonaceous chondrite breccia Aguas Zarcas – Cosmochemical characterization and origin of new carbonaceous chondrite lithologies
Geochimica et Cosmochimica Acta, Oct. 2022
334, 155, 186
[Reviewed] - Motoko Igisu; Yuichiro Ueno; Tsuyoshi Komiya; Stanley M. Awramik; Yuka Ikemoto; Ken Takai
Spatial distribution of organic functional groups in Ediacaran acritarchs from the Doushantuo Formation in South China as revealed by micro-FTIR spectroscopy
Precambrian Research, Jun. 2022
373, 106628, 106628
[Reviewed] - Motoko Igisu; Yoshio Takahashi; Katsuyuki Uematsu; Yasuo Takeichi; Yuichiro Ueno; Ken Takai
STXM-XANES analyses of carbonaceous matter in seafloor hydrothermal deposits from the similar to 3.5 Ga Dresser Formation in the North Pole area, Western Australia
GEOCHEMICAL JOURNAL, 2022
56, 4, 129, 133
[Reviewed] - Yoko Kebukawa; Michael. E. Zolensky; Cyrena A. Goodrich; Motoo Ito; Nanako O. Ogawa; Yoshinori Takano; Naohiko Ohkouchi; Kento Kiryu; Motoko Igisu; Takazo Shibuya; Matthew A. Marcus; Takuji Ohigashi; James Martinez; Yu Kodama; Muawia H. Shaddad; Peter Jenniskens
Organic matter in carbonaceous chondrite lithologies of Almahata Sitta: Incorporation of previously unsampled carbonaceous chondrite lithologies into ureilitic regolith
METEORITICS & PLANETARY SCIENCE, Jul. 2021
56, 7, 1311, 1327
[Reviewed] - Kento Kiryu; Yoko Kebukawa; Motoko Igisu; Takazo Shibuya; Michael E. Zolensky; Kensei Kobayashi
Kinetics in thermal evolution of Raman spectra of chondritic organic matter to evaluate thermal history of their parent bodies
METEORITICS & PLANETARY SCIENCE, Aug. 2020
55, 8, 1848, 1864
[Reviewed] - Yoshinori Takano; Keita Yamada; Chisato Okamoto; Hirotaka Sawada; Ryuji Okazaki; Kanako Sakamoto; Yoko Kebukawa; Kento Kiryu; Takazo Shibuya; Motoko Igisu; Hajime Yano; Shogo Tachibana
Chemical assessment of the explosive chamber in the projector system of Hayabusa2 for asteroid sampling
EARTH PLANETS AND SPACE, Jul. 2020
72, 1
[Reviewed] - Motoko Igisu; Tsuyoshi Komiya; Stanley M. Awramik; Yuka Ikemoto; Yechuan Geng; Hiroki Uehara; Ken Takai
Fourier transform infrared microspectroscopic characterization of Neoproterozoic organic microfossils from the Fifteenmile Group in Yukon, Canada
ISLAND ARC, Sep. 2019
28, 5
[Reviewed] - Motoko Igisu; Yuichiro Ueno; Ken Takai
FTIR microspectroscopy of carbonaceous matter in similar to 3.5 Ga seafloor hydrothermal deposits in the North Pole area, Western Australia
PROGRESS IN EARTH AND PLANETARY SCIENCE, Dec. 2018
5
[Reviewed] - Satoru Nakashima; Yoko Kebukawa; Norio Kitadai; Motoko Igisu; Natsuki Matsuoka
Geochemistry and the Origin of Life: From Extraterrestrial Processes, Chemical Evolution on Earth, Fossilized Life's Records, to Natures of the Extant Life
LIFE-BASEL, Dec. 2018
8, 4
[Reviewed] - Motoko Igisu; Tadashi Yokoyama; Yuichiro Ueno; Satoru Nakashima; Mie Shimojima; Hiroyuki Ohta; Shigenori Maruyama
Changes of aliphatic C-H bonds in cyanobacteria during experimental thermal maturation in the presence or absence of silica as evaluated by FTIR microspectroscopy
GEOBIOLOGY, Jul. 2018
16, 4, 412, 428
[Reviewed] - Takayuki Tashiro; Akizumi Ishida; Masako Hori; Motoko Igisu; Mizuho Koike; Pauline Mejean; Naoto Takahata; Yuji Sano; Tsuyoshi Komiya
Early trace of life from 3.95 Ga sedimentary rocks in Labrador, Canada
NATURE, Sep. 2017
549, 7673, 516, +
[Reviewed] - Motoko Igisu; Tsuyoshi Komiya; Yuka Ikemoto; Yechuan Geng; Hiroki Uehara
Studying microscale distributions of aliphatic C-H bonds in Neoproterozoic prokaryotic fossils using SR micro-FTIR
GEOCHEMICAL JOURNAL, 2017
51, 6, 589, 594
[Reviewed] - Igisu Motoko
In situ chemical analyses of Precambrian microfossils and carbonaceous matter
Chikyukagaku, 2016
50, 3, 187, 198
[Reviewed] - Motoko Igisu; Tsuyoshi Komiya; Mika Kawashima; Satoru Nakashima; Yuichiro Ueno; Jian Han; Degan Shu; Yong Li; Junfeng Guo; Shigenori Maruyama; Ken Takai
FTIR microspectroscopy of Ediacaran phosphatized microfossils from the Doushantuo Formation, Weng'an, South China
GONDWANA RESEARCH, Apr. 2014
25, 3, 1120, 1138
[Reviewed] - Takazo Shibuya; Miyuki Tahata; Kouki Kitajima; Yuichiro Ueno; Tsuyoshi Komiya; Shinji Yamamoto; Motoko Igisu; Masaru Terabayashi; Yusuke Sawaki; Ken Takai; Naohiro Yoshida; Shigenori Maruyama
Depth variation of carbon and oxygen isotopes of calcites in Archean altered upper oceanic crust: Implications for the CO2 flux from ocean to oceanic crust in the Archean
EARTH AND PLANETARY SCIENCE LETTERS, Mar. 2012
321, 64, 73
[Reviewed] - Motoko Igisu; Ken Takai; Yuichiro Ueno; Manabu Nishizawa; Takuro Nunoura; Miho Hirai; Masanori Kaneko; Hiroshi Naraoka; Mie Shimojima; Koichi Hori; Satoru Nakashima; Hiroyuki Ohta; Shigenori Maruyama; Yukio Isozaki
Domain-level identification and quantification of relative prokaryotic cell abundance in microbial communities by Micro-FTIR spectroscopy
ENVIRONMENTAL MICROBIOLOGY REPORTS, Feb. 2012
4, 1, 42, 49
[Reviewed] - Motoko Igisu; Yuichiro Ueno; Mie Shimojima; Satoru Nakashima; Stanley M. Awramik; Hiroyuki Ohta; Shigenori Maruyama
Micro-FTIR spectroscopic signatures of Bacterial lipids in Proterozoic microfossils
PRECAMBRIAN RESEARCH, Sep. 2009
173, 1-4, 19, 26
[Reviewed] - Motoko Igisu; Satoru Nakashima; Yuichiro Ueno; Stanley M. Awramik; Shigenori Maruyama
In situ infrared microspectroscopy of similar to 850 million-year-old prokaryotic fossils
APPLIED SPECTROSCOPY, Oct. 2006
60, 10, 1111, 1120
[Reviewed] - 伊規須 素子; 太田 啓之; 丸山 茂徳; 下嶋 美恵; 上野 雄一郎; 中嶋 悟; 横山 正
シアノバクテリアの珪化実験：顕微赤外分光法による加熱その場観測
日本地球化学会年会要旨集, 2006
53, 171, 171
Misc.
- Motoko Igisu; Yuichiro Ueno; Mie Shimojima; Satoru Nakashima; Hiroyuki Ohta; Shigenori Maruyama
Micro FT-IR Spectroscopic Analysis of Modern and Proterozoic Prokaryotic Fossil: Evidence of Existence of Lipids in Proterozoic Prokaryote?
ORIGINS OF LIFE AND EVOLUTION OF BIOSPHERES, Aug. 2009
39, 3-4, 372, 373 - Motoko Igisu; Satoru Nakashima; Yuichiro Ueno; Stanley M. Awramik; Shigenori Maruyama
IR and Raman microspectroscopy for the characterization of ancient life
ORIGINS OF LIFE AND EVOLUTION OF THE BIOSPHERE, Jun. 2006
36, 3, 310, 311
Books and Other Publications
- Tewari, V. C.; Seckbach, J., Contributor, Micro-FTIR Spectroscopic Imaging of ~1,900 Ma Stromatolitic Chert
Stromatolites : interaction of microbes with sediments
Springer, 2011
9789400703964
Presentations
- Igisu, M.; Tanaka, K.; Takahata, N.; Takai, K.; Sano. Y.; Komiya, T.
Multiple origins of graphite in Eoarchean metasedimentary rocks from Labrador, Canada inferred from in situ carbon isotope analyses
JpGU-AGU Joint Meeting 2026, 29 May 2026, [Invited] - 杉谷健一郎; 石田章純; 伊規須素子; 安藤卓人; 橋口未奈子
Preriminary report of Archean (3.0 Ga) large sphaeromorph acitarchs from the Pilbara Craton, Western Australia
日本地球惑星科学連合大会予稿集(Web), 2023 - 伊規須素子
顕微赤外分光法で地球の初期微生物化石に生体分子の痕跡を探す
日本放射光学会年会・放射光科学合同シンポジウム(Web), 2020, [Invited] - TASHIRO Takayuki; ISHIDA Akizumi; HORI Masako; IGISU Motoko; SANO Yuji; KOMIYA Tsuyoshi
Carbon isotope and chemical compositions of the metasedimentary rocks from Saglek Block (>3.95 Ga), Labrador, Canada: Discovery of the oldest life and its habitat environment
日本地球惑星科学連合大会予稿集(Web), 2016 - TASHIRO Takayuki; ISHIDA Akizumi; HORI Masako; IGISU Motoko; SANO Yuji; KOMIYA Tsuyoshi
Carbon isotope compositions of carbonaceous materials and carbonate from Saglek Block (>3.96 Ga), Labrador, Canada
日本地球惑星科学連合大会予稿集(Web), 2015 - 田代貴志; 堀真子; 石田章純; 伊規須素子; 佐野有司; 小宮剛
カナダ,ラブラドル地域,初期太古代(39.6億年前以前)堆積岩中の炭質物の産状と炭素同位体:最古生命の痕跡の探索
日本地質学会学術大会講演要旨, 2014
