Researcher Information
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Research History
Research activity information
Papers
- Takashi Toyofuku; Yukiko Nagai
Visualizing the biomineralization process in foraminifera: live imaging and ultrastructure
Agricul tural biotechnology, 20 Nov. 2025
9, 12, 8, 12 - Takashi Toyofuku; Yukiko Nagai; Michio Suzuki; Takashi Atsumi
Development of pH Visualization Methods to Study Shell Formation in Juvenile Pearl Oyster Pinctada fucata
18 Mar. 2025 - Manabu W L Tanimura; Yukiko Nagai; Kazumi Matsuoka; Takashi Toyofuku
〔Major achievements〕Endogenous glycoside hydrolases reveal foraminiferal capacity to degrade terrestrial and marine polysaccharides
ISME Communications, 17 Jan. 2025
5, 1
[Reviewed] - Yukiko Nagai; Remi Tsubaki; Taichi Masu; Takashi Toyofuku
〔Major achievements〕Challenge to maximize the efficiency of panel discussion
日本サイエンスコミュニケーション協会誌, May 2024
14, 1, 42, 49
[Reviewed]
Lead - Yukiko Nagai; Katsuyuki Uematsu; Briony Mamo; Takashi Toyofuku
〔Major achievements〕The calcitic test growth rate of Spirillina vivipara (Foraminifera)
Biogeosciences, 08 Apr. 2024
21, 7, 1675, 1684
[Reviewed]
Lead, Corresponding - Yurika Ujiié; Yoshiyuki Ishitani; Yukiko Nagai; Yoshihiro Takaki; Takashi Toyofuku; Shun’ichi Ishii
Unique evolution of foraminiferal calcification to survive global changes
Science Advances, 23 Jun. 2023
9, 25
[Reviewed] - Laurie M. Charrieau; Shungo Kawagata; Iona McIntosh; Yoshihiko Tamura; Yukiko Nagai; Takashi Toyofuku
Recent Deep-Sea Benthic Foraminifera from an Active Volcanic Area: First Insights around Nishinoshima, Northwest Pacific
Paleontological Research, 17 May 2023
28, 2
[Reviewed] - Pierre Methou; Verity Nye; Jonathan T. Copley; Hiromi Kayama Watanabe; Yukiko Nagai; Chong Chen
Life-history traits of alvinocaridid shrimps inhabiting chemosynthetic ecosystems around Japan
Marine Biology, 11 May 2023
170, 6
[Reviewed] - Tomoko Takahashi; Zonghua Liu; Thangavel Thevar; Nicholas Burns; Dhugal Lindsay; John Watson; Sumeet Mahajan; Satoru Yukioka; Shuhei Tanaka; Yukiko Nagai; Blair Thornton
Multimodal image and spectral feature learning for efficient analysis of water-suspended particles
Optics Express, 15 Feb. 2023
31, 5, 7492, 7492
[Reviewed] - Laurie M. Charrieau; Yukiko Nagai; Katsunori Kimoto; Delphine Dissard; Beatrice Below; Kazuhiko Fujita; Takashi Toyofuku
〔Major achievements〕The coral reef-dwelling Peneroplis spp. shows calcification recovery to ocean acidification conditions
Scientific Reports, Dec. 2022
12, 1
[Reviewed] - Rina Fujimaki; Noritoshi Suzuki; Katsunori Kimoto; Yukiko Nagai; Yuya Oaki; Shinji Shimode; Takashi Toyofuku; Hiroaki Imai
Micro- and nanometric characterization of the celestite skeleton of acantharian species (Radiolaria, Rhizaria)
Scientific Reports, Dec. 2022
12, 1
[Reviewed] - Tsubasa Kimura; Mihiro Takasaki; Ryosuke Hatai; Yukiko Nagai; Katsuyuki Uematsu; Yuya Oaki; Minoru Osada; Hiroyuki Tsuda; Takaaki Ishigure; Takashi Toyofuku; Shinji Shimode; Hiroaki Imai
〔Major achievements〕Guanine crystals regulated by chitin-based honeycomb frameworks for tunable structural colors of sapphirinid copepod, Sapphirina nigromaculata
Scientific Reports, 01 Dec. 2020
10, 1, 2266, 2266
[Reviewed] - Tetsuro Ikuta; Akihiro Tame; Masaki Saito; Yui Aoki; Yukiko Nagai; Makoto Sugimura; Koji Inoue; Katsunori Fujikura; K. Ohishi; Tadashi Maruyama; T. Yoshida
Identification of cells expressing two peptidoglycan recognition proteins in the gill of the vent mussel, Bathymodiolus septemdierum
Fish and Shellfish Immunology, Oct. 2019
93, 815, 822
[Reviewed] - Chong Chen; Hiromi Kayama Watanabe; Yukiko Nagai; Takashi Toyofuku; Ting Xu; Jin Sun; Jian Wen Qiu; Takenori Sasaki
Complex factors shape phenotypic variation in deep-sea limpets
Biology Letters, 01 Oct. 2019
15, 10, 20190504, 20190504
[Reviewed] - F. Frontalini; M. T. Losada; T. Toyofuku; J. Tyszka; J. Goleń; L. de Nooijer; B. Canonico; E. Cesarini; Y. Nagai; U. Bickmeyer; T. Ikuta; R. Tsubaki; C. Besteiro Rodriguez; E. Al-Enezi; S. Papa; R. Coccioni; J. Bijma; J. M. Bernhard
〔Major achievements〕Foraminiferal Ultrastructure: A perspective From Fluorescent and Fluorogenic Probes
Journal of Geophysical Research: Biogeosciences, 01 Sep. 2019
124, 9, 2823, 2850
[Reviewed] - Jun Kawano; Takashi Toyofuku; Kaede Nishimura; Akiyuki Ueda; Yukiko Nagai; Sachiko Kawada; Henry Teng; Takaya Nagai
〔Major achievements〕Direct Two-Dimensional Time Series Observation of pH Distribution around Dissolving Calcium Carbonate Crystals in Aqueous Solution
Crystal Growth and Design, 07 Aug. 2019
19, 8, 4212, 4217
[Reviewed] - Azumi Kuroyanagi; Takashi Toyofuku; Yukiko Nagai; Katsunori Kimoto; Hiroshi Nishi; Reishi Takashima; Hodaka Kawahata
〔Major achievements〕Effect of Euxinic Conditions on Planktic Foraminifers: Culture Experiments and Implications for Past and Future Environments
Paleoceanography and Paleoclimatology, Jan. 2019
34, 1, 54, 62
[Reviewed] - Yukiko Nagai; Katsuyuki Uematsu; Chong Chen; Ryoji Wani; Jaroslaw Tyszka; Takashi Toyofuku
〔Major achievements〕Weaving of biomineralization framework in rotaliid foraminifera: Implications for paleoceanographic proxies
Biogeosciences, 14 Nov. 2018
15, 22, 6773, 6789
[Reviewed] - Laurie M. Charrieau; Helena L. Filipsson; Yukiko Nagai; Sachiko Kawada; Karl Ljung; Emma Kritzberg; Takashi Toyofuku
〔Major achievements〕Decalcification and survival of benthic foraminifera under the combined impacts of varying pH and salinity
Marine Environmental Research, Jul. 2018
138, 36, 45
[Reviewed] - Kazue Ohishi; Yoshimitsu Nakamura; Chiho Kusaka; Yukiko Nagai; Masatoshi Nakazawa; Takao Yoshida; Tadashi Maruyama
Monoclonal antibodies that recognize symbiotic bacteria and hemocytes in the deep-sea vesicomyid clam Phreagena okutanii
JAMSTEC Report of Research and Development, Mar. 2018
26, 75, 83
[Reviewed] - Yukiko Nagai; Katsuyuki Uematsu; Ryoji Wani; Takashi Toyofuku
〔Major achievements〕Reading the fine print: Ultra-microstructures of foraminiferal calcification revealed using focused ion beam microscopy
Frontiers in Marine Science, 28 Feb. 2018
4, FEB, 67
[Reviewed] - Tetsuro Ikuta; Makoto Sugimura; Suguru Nemoto; Yui Aoki; Akihiro Tame; Masahiro Yamamoto; Masaki Saito; Yoshiki Shimokawa; Tetsuya Miwa; Yukiko Nagai; Takao Yoshida; Katsunori Fujikura; Takashi Toyofuku
Effects of a long-term rearing system for deep-sea vesicomyid clams on host survival and endosymbiont retention
Fisheries Science, 01 Jan. 2018
84, 1, 41, 51
[Reviewed] - Tomo O. Watsuji; Kaori Motoki; Emi Hada; Yukiko Nagai; Yoshihiro Takaki; Asami Yamamoto; Kenji Ueda; Takashi Toyofuku; Hiroyuki Yamamoto; Ken Takai
Compositional and functional shifts in the epibiotic bacterial community of Shinkaia crosnieri Baba & Williams (A squat lobster from hydrothermal vents) during Methane-fed rearing
Microbes and Environments, 2018
33, 4, 348, 356
[Reviewed] - Tomo o. Watsuji; Remi Tsubaki; Chong Chen; Yukiko Nagai; Satoshi Nakagawa; Masahiro Yamamoto; Daisuke Nishiura; Takashi Toyofuku; Ken Takai
Cultivation mutualism between a deep-sea vent galatheid crab and its chemosynthetic epibionts
Deep-Sea Research Part I: Oceanographic Research Papers, Sep. 2017
127, 13, 20
[Reviewed] - Takashi Toyofuku; Miki Y. Matsuo; Lennart Jan De Nooijer; Yukiko Nagai; Sachiko Kawada; Kazuhiko Fujita; Gert Jan Reichart; Hidetaka Nomaki; Masashi Tsuchiya; Hide Sakaguchi; Hiroshi Kitazato
〔Major achievements〕Proton pumping accompanies calcification in foraminifera
Nature Communications, 27 Jan. 2017
8, 14145, 14145
[Reviewed] - Laurie M. Charrieau; Helena L. Filipsson; Yukiko Nagai; Sachiko Kawada; Karl Ljung; Emma Kritzberg; Takashi Toyofuku
Decalcification and survival of benthic foraminifera under the combined impacts of varying pH and salinity
Lundqua Thesis, 2017
2017, 85, 99
[Reviewed] - Kimiko Nakajima; Monami Suzuki; Yukiko Nagai; Kenta Izumida; Yuya Oaki; Takashi Toyofuku; Jelle Bijma; Gernot Nehrke; Markus Raitzsch; Kenichiro Tani; Hiroaki Imai
Hierarchical textures on aragonitic shells of the hyaline radial foraminifer: Hoeglundina elegans
CrystEngComm, 2017
19, 47, 7191, 7196
[Reviewed] - Hiromi Watanabe; Takuya Yahagi; Yukiko Nagai; Mi Hye Seo; Shigeaki Kojima; Jun Ichiro Ishibashi; Hiroyuki Yamamoto; Katsunori Fujikura; Satoshi Mitarai; Takashi Toyofuku
Different thermal preferences for brooding and larval dispersal of two neighboring shrimps in deep-sea hydrothermal vent fields
Marine Ecology, 01 Dec. 2016
37, 6, 1282, 1289
[Reviewed] - Kazue Ohishi; Masahiro Yamamoto; Akihiro Tame; Chiho Kusaka; Yukiko Nagai; Makoto Sugimura; Koji Inoue; Katsuyuki Uematsu; Takao Yoshida; Tetsuro Ikuta; Takashi Toyofuku; Tadashi Maruyama
Long-term cultivation of the deep-sea clam Calyptogena okutanii: Changes in the abundance of chemoautotrophic Symbiont, elemental sulfur, and mucus
Biological Bulletin, 01 Jun. 2016
230, 3, 257, 267
[Reviewed] - Tetsuro Ikuta; Kanae Igawa; Akihiro Tame; Tsuneyoshi Kuroiwa; Haruko Kuroiw; Yui Aoki; Yoshihiro Takaki; Yukiko Nagai; Genki Ozawa; Masahiro Yamamoto; Ryusaku Deguchi; Katsunori Fujikura; Tadashi Maruyama; Takao Yoshida
Surfing the vegetal pole in a small population: Extracellular vertical transmission of an’intracellular’ deep-sea clam symbiont
Royal Society Open Science, 18 May 2016
3, 5, 160130, 160130
[Reviewed] - Tetsuro Ikuta; Yoshihiro Takaki; Yukiko Nagai; Shigeru Shimamura; Miwako Tsuda; Shinsuke Kawagucci; Yui Aoki; Koji Inoue; Morimi Teruya; Kazuhito Satou; Kuniko Teruya; Makiko Shimoji; Hinako Tamotsu; Takashi Hirano; Tadashi Maruyama; Takao Yoshida
Heterogeneous composition of key metabolic gene clusters in a vent mussel symbiont population
ISME Journal, Apr. 2016
10, 4, 990, 1001
[Reviewed] - Kimiko Nakajima; Yukiko Nagai; Monami Suzuki; Yuya Oaki; Kimiyoshi Naito; Yoshihisa Tanaka; Takashi Toyofuku; Hiroaki Imai
Mesoscopic crystallographic textures on shells of a hyaline radial foraminifer: Ammonia beccarii
CrystEngComm, 2016
18, 37, 7135, 7139
[Reviewed] - Eri Iwata; Yukiko Nagai; Hideaki Sasaki
Immunohistochemistry of Brain Arginine Vasotocin and Isotocin in False Clown Anemonefish Amphiprion ocellaris
The Open Fish Science Journal, 2010
3, 147, 153
[Reviewed] - Eri Iwata; Yukiko Nagai; Hideaki Sasaki
Social rank modulates brain arginine vasotocin immunoreactivity in false clown anemonefish (Amphiprion ocellaris)
Fish Physiology and Biochemistry, 2010
36, 3, 337, 345
[Reviewed] - Yukiko Nagai; Kyohei Mikami; Hideaki Sasaki; Eri Iwata
Social rank influence arginine vasotocin (AVT) immunoreactivity in the brain of false clown anemonefish, Amphiprion ocellaris
2009 - Eri Iwata; Yukiko Nagai; Mai Hyoudou; Hideaki Sasaki
Social environment and sex differentiation in the false clown anemonefish, Amphiprion ocellaris
Zoological Science, Feb. 2008
25, 2, 123, 128
[Reviewed]
Misc.
- 豊福 高志; 長井 裕季子
有孔虫石灰化の環境可視化と構造解析—Visualizing the biomineralization process in foraminifera : live imaging and ultrastructure—特集 バイオミネラリゼーションと炭素循環
アグリバイオ = Agricultural biotechnology, Nov. 2025
9, 12, 960, 964 - 松本信二; 川野潤; 三木康誠; 豊福高志; 長井裕季子; 永井隆哉
Analysis of the formation process of calcium carbonate polymorphs in gels with the pH visualization technique
日本鉱物科学会年会講演要旨(Web), 2023
2023 - 松本信二; 川野潤; 豊福高志; 豊福高志; 長井裕季子; 長井裕季子; 永井隆哉
Observation of pH distribution during the formation of CaCO3 in gel media
日本鉱物科学会年会講演要旨(Web), 2022
2022 - 川野潤; 矢崎誠; 松本信二; 豊福高志; 豊福高志; 長井裕季子; 長井裕季子; 永井隆哉
Visualization of pH/ionic concentration during crystal dissolution/formation process in aqueous solution
結晶成長国内会議予稿集(CD-ROM), 2021
50th - 川野潤; 矢崎誠; 豊福高志; 豊福高志; 長井裕季子; 長井裕季子; TENG Henry; 永井隆哉
Investigation on the crystal growth/dissolution mechanisms by 2-D visualization of pH and ionic concentration
結晶成長国内会議予稿集(CD-ROM), 2019
48th - 川野潤; 矢崎誠; 豊福高志; 豊福高志; 長井裕季子; 長井裕季子; TENG Henry; 永井隆哉
Investigation on the crystal growth/dissolution mechanisms by using the 2-D visualization technique with fluorescent probes
日本鉱物科学会年会講演要旨(Web), 2019
2019 - 豊福 高志; 長井 裕季子
〔Major achievements〕Shell formation of foraminifera : marine unicellular calcifiers
日本結晶成長学会誌 Journal of the Japanese Association for Crystal Growth, 2019
46, 3, 10p - 川野潤; 豊福高志; 豊福高志; 長井裕季子; 長井裕季子; 田中淳也; 永井隆哉
Visualization of dissolution process of carbonate crystals in aqueous solutions by using fluorescent probes
結晶成長国内会議予稿集(CD-ROM), 2018
47th - Kawano Jun; Toyofuku Takashi; Yukiko Nagai; Shoichi Toh; Tanaka Jun-ya; Nagai Takaya
〔Major achievements〕Visualization of pH/Ca ion concentration distribution around dissolving CaCO3 in aqueous solution
Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences, 2018
2018, 0, 98, 98 - 川野潤; 豊福高志; 長井裕季子; 田中淳也; 上田暁之; 西村楓; 永井隆哉
Direct observation of pH/ionic concentration change around dissolving crystal in aqueous solution
結晶成長国内会議予稿集(CD-ROM), 2017
46th - 小谷野有加; 杉村誠; 神応義夫; 北嶋円; 鈴木良博; 根本卓; 三宅裕志; 井上広滋; 中川聡; 八巻鮎太; 三輪哲也; 宮本教生; 長井裕季子; 豊福高志; 堀由紀子
化学合成生態系を構成する生物の飼育方法
動物園水族館雑誌, 2017
59, 1 - Kawano Jun; Nishimura Kaede; Toyofuku Takashi; Nagai Yukiko; Kawada Sachiko; Teng Henry; Nagai Takaya
〔Major achievements〕Visualization of pH distribution around dissolving minerals
Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences, 2017
2017, 0, 118, 118 - Kawano Jun; Toyofuku Takashi; Nagai Yukiko; Kawada Sachiko; Nagai Takaya
Visualization of pH and Ca concentration around CaCO3 crystals during dissolution and growth
Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences, 2016
2016, 0, 129, 129 - Eri Iwata; Kyohei Mikami; Jun Manbo; Yukiko Nagai; Hideaki Sasaki
〔Major achievements〕Social interaction and sex differentiation in anemonefish
ENDOCRINE JOURNAL, Mar. 2010
57, S311, S311
[Reviewed]
