Researcher basic information

• Ph.D. in Science, Osaka University

• https://researchmap.jp/sohei_tasaki?lang=en

• https://orcid.org/0000-0002-4259-0075
• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201201009024944388
• https://sohei-tasaki.github.io

• 50713020

• https://orcid.org/0000-0002-4259-0075

• 201201009024944388

• Mathematical modeling
• Differential equations
• Mathematical biology
• Bifurcation theory
• Variational method
• Lipid bilayers
• Shape memory alloys
• Viscoelasticity
• Phase separation
• Phase transition
• Non-equilibrium thermodynamics
• Collective motion
• Morphogenesis
• Gene regulatory networks
• Cellular diversity
• Self-organization
• Biofilms
• Colony patterns
• Bacillus subtilis
• Pattern Formation

• Natural Science, Applied mathematics and statistics
• Natural Science, Basic mathematics
• Natural Science, Biophysics, chemical physics and soft matter physics
• Life Science, Bacteriology
• Life Science, Developmental biology
• Life Science, Biophysics

• Bachelor's degree program, School of Science
• Master's degree program, Graduate School of Science
• Doctoral (PhD) degree program, Graduate School of Science

Research activity information

• Necessary and sufficient condition for hysteresis in the mathematical model of the cell type regulation of Bacillus subtilis
  Sohei Tasaki; Madoka Nakayama; Izumi Takagi; Jun-ichi Wakita; Wataru Shoji
  Journal of Mathematical Biology, 92, 1, Springer Science and Business Media LLC, 02 Dec. 2025, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Symmetry breaking bifurcation and the stability of stationary solutions of a phase-field model
  Yasuhito Miyamoto; Tatsuki Mori; Sohei Tasaki; Tohru Tsujikawa; Shoji Yotsutani
  Journal of Differential Equations, 441, 113500, 113500, Elsevier BV, Oct. 2025, [Peer-reviewed]
  Scientific journal
• Migrating mesoderm cells self-organize into a dynamic meshwork structure during chick gastrulation
  Yukiko Nakaya; Mitsusuke Tarama; Sohei Tasaki; Ayako Isomura-Matoba; Tatsuo Shibata
  eLife, 14, e84749, eLife Sciences Publications, Ltd, 21 Aug. 2025, [Peer-reviewed], [International Magazine]
  Scientific journal, Migration of cell populations is a fundamental process in morphogenesis and disease. The mechanisms of collective cell migration of epithelial cell populations have been well studied. It remains unclear, however, how the highly motile mesenchymal cells, which migrate extensively throughout the embryo, are connected with each other and coordinated as a collective. During chick gastrulation, cells emerging from the primitive streak and migrating in the 3D space between ectoderm and endoderm (mesoderm region) exhibit a novel form of collective migration. Using live imaging and quantitative analysis, such as topological data analysis (TDA), we found that these cells undergo a novel form of collective migration, in which they form a meshwork structure while moving away from the primitive streak. Overexpressing a mutant form of N-cadherin was associated with reduced speed of tissue progression and directionality of the collective cell movement, whereas the speed of individual cells remains unchanged. To investigate how this meshwork arises, we utilized an agent-based theoretical model, which suggests that cell elongation, cell-cell adhesion, and cell density are the key parameters for the meshwork formation. These data provide novel insights into how a supracellular structure of migrating mesenchymal cells may arise in loosely connected cell populations.
• Turing patterns on polymerized membranes: a coarse-grained lattice modelling with internal degree of freedom for polymer direction
  Fumitake Kato; Hiroshi Koibuchi; Elie Bretin; Camille Carvalho; Roland Denis; Simon Masnou; Madoka Nakayama; Sohei Tasaki; Tetsuya Uchimoto
  Soft Matter, Royal Society of Chemistry (RSC), 2025, [Peer-reviewed]
  Scientific journal, We numerically study Turing patterns (TPs) on two-dimensional surfaces with a square boundary in ${\bf R}^3$ using a surface model for polymerized membranes. The variables used to describe the membranes...
• scEGOT: single-cell trajectory inference framework based on entropic Gaussian mixture optimal transport
  Toshiaki Yachimura; Hanbo Wang; Yusuke Imoto; Momoko Yoshida; Sohei Tasaki; Yoji Kojima; Yukihiro Yabuta; Mitinori Saitou; Yasuaki Hiraoka
  BMC Bioinformatics, 25, 1, Springer Science and Business Media LLC, 23 Dec. 2024, [Peer-reviewed]
  Scientific journal
• Numerical study of anisotropic diffusion in Turing patterns based on Finsler geometry modeling
  Gildas Diguet; Madoka Nakayama; Sohei Tasaki; Fumitake Kato; Hiroshi Koibuchi; Tetsuya Uchimoto
  Physical Review E, 109, 1, American Physical Society (APS), 10 Jan. 2024, [Peer-reviewed]
  Scientific journal
• Nutrient-driven dedifferentiation of enteroendocrine cells promotes adaptive intestinal growth in Drosophila
  Hiroki Nagai; Luis Augusto Eijy Nagai; Sohei Tasaki; Ryuichiro Nakato; Daiki Umetsu; Erina Kuranaga; Masayuki Miura; Yuichiro Nakajima
  Developmental Cell, 58, 18, 1, 18, Elsevier BV, Sep. 2023, [Peer-reviewed]
  Scientific journal
• All global bifurcation diagrams of stationary solutions to a phase field model
  Mori T; Tasaki S; Tsujikawa T; Yotsutani S
  Discrete and Continuous Dynamical Systems - Series B, 28, 12, 6306, 6344, American Institute of Mathematical Sciences (AIMS), Sep. 2022, [Peer-reviewed]
  Scientific journal,

  <p style='text-indent:20px;'>We are concerned with bifurcation diagrams of stationary solutions to a phase field model proposed by Fix and followed by Caginalp. We show all the global bifurcation diagrams of stationary solutions to the model in the 1-dimension case. We see that bifurcation diagrams are surprisingly rich in variety depending on the latent heat and the initial total enthalpy. For instance, bifurcation diagrams include the secondary bifurcation point where symmetric breaking occurs, and curves which connect a limit of boundary layer solutions to the other limit of internal layer solutions.</p>

  , 13250368;13250366
• Multicellular model of angiogenesis
  Takashi Nakazawa; Sohei Tasaki; Kiyohiko Nakai; Takashi Suzuki
  AIMS Bioengineering, 9, 1, 44, 60, Jan. 2022, [Peer-reviewed]
  English, Scientific journal
• Time Changes in the VEGF-A Concentration Gradient Lead Neovasculature to Engage in Stair-Like Growth
  Yukinobu Ito; Dhisa Minerva; Sohei Tasaki; Makoto Yoshida; Takashi Suzuki; Akiteru Goto
  Springer Proceedings in Mathematics & Statistics, 370, 226, 234, Springer Singapore, Aug. 2021, [Peer-reviewed]
  In book
• Multilevel modeling of cell population migration cycles and response to environmental pH in Bacillus subtilis
  Madoka Nakayama; Izumi Takagi; Jun-ichi Wakita; Wataru Shoji; Sohei Tasaki
  bioRxiv, openRxiv, 11 Sep. 2020, [Last author, Corresponding author]
  Microbial populations are ubiquitous, many of which form robust, multicellular structures called biofilms that protect cells from environmental damage. Understanding their migration cycles is crucial for controlling target microbial populations. Here we develop a multilevel mathematical model that captures the migration cycle of Bacillus subtilis cell populations and reproduces the periodic expansion of colonies into concentric circles. We construct an input/output model that regulates cell types in response to environmental conditions; based on this, we propose a theoretical model for the generation of cell population migration cycles. We then construct a multilevel system that links the cell-level state regulation model with tissue-level partial differential equations governing cell density, signal, and resource fields. Through this approach, we successfully simulate cyclically expanding colonies as well as their environmental pH dependence. The proposed models provide a robust basis for describing highly self-regulating multicellular systems and predicting broader biofilm-related phenomena.
• Morphological changes and their advantages in Bacillus subtilis colonies responding to environmental pH variation
  Tasaki S; Nakayama M; Shoji Y
  RIMS Kokyuroku, 2087, 24, 30, Aug. 2018, [Invited]
  Japanese, International conference proceedings
• Non-invasive force measurement reveals the number of active kinesins on a synaptic vesicle precursor in axonal transport regulated by ARL-8
  Kumiko Hayashi; Shin Hasegawa; Takashi Sagawa; Sohei Tasaki; Shinsuke Niwa
  Physical Chemistry Chemical Physics, 20, 5, 3403, 3410, Royal Society of Chemistry, 07 Feb. 2018, [Peer-reviewed]
  English, Scientific journal
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Sohei Tasaki; Madoka Nakayama; Wataru Shoji
  Development, Growth & Differentiation, 59, 5, 369, 378, Jun. 2017, [Peer-reviewed], [Invited]
  Scientific journal
• Self-organization of bacterial communities against environmental pH variation: Controlled chemotactic motility arranges cell population structures in biofilms
  Sohei Tasaki; Madoka Nakayama; Wataru Shoji
  PLOS ONE, 12, 3, e0173195, e0173195, Mar. 2017, [Peer-reviewed]
  English, Scientific journal
• Environmental pH dependence of dense branching morphology-like colonies of Bacillus subtilis
  Nakayama M; Tasaki S; Shoji W
  RIMS Kokyuroku, 1994, 22, 27, Apr. 2016
  Japanese, Scientific journal
• Interactions in mixed lipid bilayers
  Tasaki S
  Mathematics for Industry, 1, 265, 274, Jul. 2014, [Peer-reviewed], [Invited]
  English, International conference proceedings
• Phase-separating elastic system of mixed lipid bilayers
  Sohei Tasaki
  PHYSICA D-NONLINEAR PHENOMENA, 246, 1, 23, 38, Mar. 2013, [Peer-reviewed]
  English, Scientific journal
• Stationary solutions to a strain-gradient type thermoviscoelastic system
  Pawlow I; Suzuki T; Tasaki S
  Differential and Integral Equations, 25, 3-4, 289, 340, Dec. 2012, [Peer-reviewed], ［Internationally co-authored］
  English, Scientific journal
• Hamilton formalism to compressible non-viscous fluid equations and application
  Murakami T; Suzuki T; Tasaki S
  NCTAM, 59, 105, Jan. 2011
• Stationary states and their stability in mathematical models of non-equilibrium thermodynamics
  Tasaki S
  Osaka University, 1, 131, Sep. 2010, [Peer-reviewed]
• Stationary solutions to a thermoelastic system on shape memory materials
  Suzuki T; Tasaki S
  Nonlinearity, 23, 10, 2623, 2656, Aug. 2010, [Peer-reviewed]
  English, Scientific journal
• Stationary solutions to the Falk system on shape memory alloys
  Suzuki T; Tasaki S
  Mathematical Methods in the Applied Sciences, 33, 8, 994, 1011, May 2010, [Peer-reviewed]
  English, Scientific journal
• Stationary Fix-Caginalp equation with non-local term
  Suzuki T; Tasaki S
  Nonlinear Analysis, 71, 3-4, 1329, 1349, May 2009, [Peer-reviewed]
  English, Scientific journal

• 数理科学 2021年9月号 No. 699 数理モデリングと生命科学
  枯草菌コロニーの形態形成モデル
  サイエンス社, Aug. 2021, [Contributor]
• The Impact of Applications on Mathematics
  Chapter 20
  Springer Nature, Jul. 2014

• Cell population migration cycle and response to environmental pH in Bacillus subtilis
  Madoka Nakayama; Izumi Takagi; Jun-ichi Wakita; Wataru Shoji; Sohei Tasaki
  MSJ Spring Meeting 2026, 25 Mar. 2026
  23 Mar. 2026 - 26 Mar. 2026, Tokyo University of Science
• Optimizing nutrient-consuming motility of bacteria with mathematical model
  Peize Yu; Sohei Tasaki
  MSJ Spring Meeting 2026, 25 Mar. 2026
  23 Mar. 2026 - 26 Mar. 2026, Tokyo University of Science
• Toward completing the pattern diagram of Bacillus subtilis colonies
  Tasaki, S.
  RIMS Symposium (open) "Mathematical Modeling and Analysis of Nonlinear Phenomena of Self-Organization and Self-Collapse", 14 Nov. 2025
  11 Nov. 2025 - 14 Nov. 2025, [Invited]
• Mathematical analysis of motility response to resources in bacterial cell populations
  Tasaki S.
  ReaDiNet 2024: Recent Progresses in the theory of reaction and diffusion equations, 22 Oct. 2024
  20 Oct. 2024 - 25 Oct. 2024, Uni Hotel, Jeju, Korea, [Invited], [International presentation]
• Multilevel concepts in bacterial cell populations
  Tasaki S
  7th Joint Conference of A3 Foresight Program on Computational and Applied Mathematics, 01 Sep. 2024
  29 Aug. 2024 - 02 Sep. 2024, Wuhan University, Wuhan, China, [Invited], [International presentation]
• Multilevel mathematical modeling methods for morphogenesis of bacterial cell populations
  Tasaki S
  KSMB-SMB2024SEOUL, 05 Jul. 2024
  30 Jun. 2024 - 05 Jul. 2024, Konkuk University, Seoul, Korea, Republic of, [Invited], [International presentation]
• Multilevel mathematical modeling methods for morphogenesis of bacterial cell populations
  Tasaki S
  Turing Symposium on Morphogenesis, 2024 — a Panorama in Turing's Sight —, 08 Feb. 2024
  08 Feb. 2024 - 10 Feb. 2024, Tohoku University, Sendai, Japan, [Invited], [International presentation]
• 最適輸送理論を用いた細胞分化の軌跡推定について
  Yachimura T; Imoto Y; Tasaki S; Hiraoka Y
  2023年度応用数学合同研究集会, 15 Dec. 2023
  14 Dec. 2023 - 16 Dec. 2023
• バクテリアコロニー形成モデルの構築を目指して
  Murata R; Nagayama M; Tasaki S; Nakayama M
  2023年度応用数学合同研究集会, 14 Dec. 2023
  14 Dec. 2023 - 16 Dec. 2023
• Multilevel mathematical modeling methods for morphogenesis of bacterial cell populations
  Tasaki S
  International Conference on Recent Developments of Theory and Methods in Mathematical Biology, 23 Oct. 2023
  23 Oct. 2023 - 27 Oct. 2023, National Taiwan University, Taiwan, Province of China, [Invited], [International presentation]
• Eigenpairs of the linear elasticity operator on the disk
  Sohei Tasaki
  The Mathematical Society of Japan. Autumn Meeting 2023, 23 Sep. 2023
  20 Sep. 2023 - 23 Sep. 2023
• 枯草菌の集団形態形成の実験と数理
  Sohei Tasaki
  札幌非線形現象研究会2023, 30 Aug. 2023
  29 Aug. 2023 - 31 Aug. 2023, [Invited]
• Multilevel mathematical modeling methods for morphogenesis of bacterial cell populations
  Sohei Tasaki
  One-day workshop on pattern dynamics appearing in reaction-diffusion system, 26 Aug. 2023
  26 Aug. 2023 - 26 Aug. 2023, [Invited]
• Multilevel mathematical modeling methods for morphogenesis of bacterial cell populations
  Sohei Tasaki
  10th International Congress on Industrial and Applied Mathematics (ICIAM2023), 23 Aug. 2023
  20 Aug. 2023 - 25 Aug. 2023, [Invited]
• Multilevel mathematical modeling methods for morphogenesis of bacterial cell populations
  Sohei Tasaki
  反応拡散系パターンダイナミクスの新展開, 23 Jun. 2023
  22 Jun. 2023 - 24 Jun. 2023, [Invited]
• Mathematical analysis of dedifferentiation in the intestinal epithelial cell community
  Tasaki S; Nagai H; Nagai L; Nakato R; Miura M; Nakajima Y
  2023日本数学会年会, 18 Mar. 2023
  15 Mar. 2023 - 18 Mar. 2023
• Mathematical analysis of dedifferentiation in the intestinal epithelial cell community
  Tasaki S; Nagai H; Nagai L; Nakato R; Umetsu D; Miura M; Nakajima Y
  2022年度応用数学合同研究集会, 15 Dec. 2022
  15 Dec. 2022 - 17 Dec. 2022
• Secondary bifurcation and the direction of bifurcation of stationary solutions to a phase field model
  Tatsuki Mori; Sohei Tasaki; Tohru Tsujikawa; Shoji Yotsutani
  The Mathematical Society of Japan. Autumn Meeting 2022, 14 Sep. 2022
  13 Sep. 2022 - 16 Sep. 2022
• Mathematical analysis of dedifferentiation in the intestinal epithelial cell community
  田崎 創平; 長井 広樹; ルイスアウグストエイジ ナガイ; 中戸 隆一郎; 三浦 正幸; 中嶋 悠一朗
  JSIAM 2022, 10 Sep. 2022
  08 Sep. 2022 - 10 Sep. 2022, [Invited]
• Data assimilation of a cellular signal transduction system
  Sohei Tasaki
  JSIAM 2022, 09 Sep. 2022
  08 Sep. 2022 - 10 Sep. 2022, [Invited]
• 腸管上皮細胞社会の数理モデル ー脱分化の役割と腸管増大の定量的解明ー
  Sohei Tasaki
  新学術領域「細胞社会ダイバーシティーの統合的解明と制御」第4回若手ワークショップ, 27 Jan. 2022
  26 Jan. 2022 - 28 Jan. 2022
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Sohei Tasaki
  The 22ND RIES-Hokudai International Symposium ‘癒’ [Yu], 06 Dec. 2021
  06 Dec. 2021 - 07 Dec. 2021, [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Sohei Tasaki
  Modeling and Mathematical Analysis of Dynamics of Patterns, 19 Oct. 2021
  18 Oct. 2021 - 20 Oct. 2021, Zoom Online Meeting, [Invited]
• Data assimilation of a cellular signal transduction system
  Tasaki S
  Hokkaido University PDE Seminar, 25 Jun. 2021
• Data assimilation of a cellular signal transduction system
  Tasaki S
  第5回マルチNGSオミクス解析研究会, 11 Jun. 2021
  [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  北海道大学理学研究院数学部門談話会, 21 May 2021
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  117th HMMC Seminar, 20 May 2021
  20 May 2021, [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  第32回さいたま数理解析セミナー, 26 Dec. 2020
  26 Dec. 2020 - 26 Dec. 2020, [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  明治非線型数理セミナー・秋の学校, 24 Nov. 2020
  22 Nov. 2020 - 24 Nov. 2020, [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  MIMS Workshop "Mathematical Modellogy", 06 Nov. 2020
  05 Nov. 2020 - 06 Nov. 2020, [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  JSPS Core-to-Core Program “Establishing International Research Network of Mathematical Oncology”, 28 Oct. 2020
  26 Oct. 2020 - 28 Oct. 2020, [Invited]
• Multilevel life sciences by data assimilation
  Tasaki S
  JSMB2020, 20 Sep. 2020
  20 Sep. 2020 - 22 Sep. 2020, Online Meeting, [Invited]
• A mathematical modeling approach to epigenetic dynamics
  Tasaki S
  9th ASHBi Colloquium, 28 Jul. 2020
  Zoom Online Meeting
• 細菌集団のライフサイクル
  田﨑 創平
  新学術領域「細胞社会ダイバーシティーの統合的解明と制御」第3回若手ワークショップ, 13 Feb. 2020, Oral presentation
  12 Feb. 2020 - 13 Feb. 2020, KKRホテル熱海, 13250368;13250366
• 細胞のシグナル伝達系のデータ同化
  田﨑 創平
  第16回生物数学の理論とその応用, 27 Jan. 2020, Oral presentation
  27 Jan. 2020 - 31 Jan. 2020, 京都大学数理解析研究所, 13250366
• 細菌集団のライフサイクル
  田﨑 創平; 中山 まどか; 高木 泉; 東海林 亙
  新学術領域「細胞社会ダイバーシティーの統合的解明と制御」第5回公開シンポジウム, 29 Jan. 2020, Poster presentation
  29 Jan. 2020 - 29 Jan. 2020, 公益財団法人がん研究会, 13250368;13250366
• 枯草菌の集団形態形成（第1部：細菌の細胞ダイバーシティー（講演と実演）、第2部：枯草菌の集団形態形成（講演））
  田﨑 創平
  2019年度第9回明治非線型数理セミナー, 22 Jan. 2020, Invited oral presentation
  22 Jan. 2020 - 22 Jan. 2020, 明治大学生田キャンパス, 13250368;13250366, [Invited]
• 枯草菌の集団形態形成
  田﨑 創平
  第79回京都駅前セミナー, 17 Jan. 2020, Invited oral presentation
  17 Jan. 2020 - 17 Jan. 2020, キャンパスプラザ京都, 13250368;13250366, [Invited]
• 枯草菌の細胞タイプ制御の数理モデルとヒステリシスの条件
  田﨑 創平; 中山 まどか; 高木 泉; 東海林 亙
  2019年度応用数学合同研究集会, 12 Dec. 2019, Oral presentation
  12 Dec. 2019 - 14 Dec. 2019, 龍谷大学, 13250368;13250366
• Mesoderm cells collectively migrate in the form of dynamic meshwork during chick gastrulation
  Nakaya U; Tasaki S; Isomura A; Shibata T
  The 42nd Annual Meeting of The Molecular Biology Society of Japan, 04 Dec. 2019, Oral presentation
  03 Dec. 2019 - 06 Dec. 2019, Fukuoka International Congress Center
• Life cycle of bacterial population
  Tasaki S
  Mathematics and Phenomena in Miyazaki (MPM) 2019, 16 Nov. 2019
  Miyazaki University, [Invited]
• Morphologies of Bacillus subtilis communities
  Tasaki S
  17th Colloquium, Research Center for Mathematics and Data Science, Kwansei Gakuin University, 07 Nov. 2019
  Kwansei Gakuin University, [Invited]
• Data assimilation simulation of a cellular signal transduction system
  Shibata T; Tasaki S
  29th Annual Meeting of the Japanese Society for Mathematical Biology (JSMB), 2019, 15 Sep. 2019
  Tokyo Institute of Technology, [Invited]
• Dynamic self-organization of migrating mesoderm cell collective during chick gastrulation
  Tasaki S; Nakaya Y; Shibata T
  JSIAM Annual Meeting 2019, 05 Sep. 2019
  The University of Tokyo, [Invited]
• Mesoderm cells collectively migrate in the form of dynamic meshwork during chick gastrulation
  Nakaya Y; Tasaki S; Isomura A; Shibata T
  EMBO-EMBL Symposium: Mechanical Forces in Development, 03 Jul. 2019
  EMBL, Heidelberg, Germany
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  西日本非線形研究会2019, 29 Jun. 2019
  Kyushu University
• Challenge to uncover the mystery of meshwork structure of migrating mesoderm cell during chicken gastrulation
  Nakaya Y; Tasaki S; Isomura A; Shibata T
  新学術領域「細胞社会ダイバーシティーの統合的解明と制御」第4回公開シンポジウム, 27 Jun. 2019
  RIKEN BDR
• Dynamic self-organization of migrating mesoderm cell collective
  Tasaki S
  第12回SaMPLセミナー・2019年度第3回広島大学数学科談話会, 25 Jun. 2019
  Hiroshima University, [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  Modeling Biological Phenomena by Parabolic PDEs and their Analysis, 07 Jun. 2019, English, Invited oral presentation
  Renmin University of China, [Invited], [International presentation]
• Roles of N-cadherin mediated cell-cell contact in collective cell migration during chick mesoderm formation
  Nakaya Y; Tasaki S; Isomura A; Shibata T
  52nd Annual Meeting of the Japanese Society of Developmental Biologists, 15 May 2019, English, Poster presentation
  Osaka International House, [International presentation]
• Morphologies of Bacillus subtilis communities
  Tasaki S
  第2回はこだて現象数理研究集会, 10 May 2019
  Future University Hakodate, [Invited]
• Necessary and sufficient condition for hysteresis in a mathematical model of cell type regulation of Bacillus subtilis
  Tasaki S; Nakayama M; Takagi I; Shoji W
  The Mathematical Society of Japan. Annual Meeting 2019, 18 Mar. 2019
  Tokyo Institute of Technology
• Challenge to uncover the mystery of meshwork structure of migrating mesoderm cell
  Nakaya Y; Tasaki S; Isomura A; Shibata T
  新学術領域「細胞社会ダイバーシティーの統合的解明と制御」第2回若手ワークショップ, 28 Feb. 2019
• Dynamic self-organization of migrating mesoderm cell collective
  Tasaki S; Nakaya Y; Isomura A; Shibata T
  新学術領域「細胞社会ダイバーシティーの統合的解明と制御」第2回若手ワークショップ, 28 Feb. 2019
  仙台秋保 岩沼屋
• Morphologies of Bacillus subtilis communities responding to environmental variation and their multiscale modeling
  Tasaki S; Nakayama M; Shoji Y
  JSDB Autumn Symposium 2018, 24 Nov. 2018
  Okazaki Conference Center
• Challenge to uncover the mystery of meshwork structure of migrating mesoderm cell during chicken gastrulation
  Nakaya Y; Tasaki S; Isomura A; Shibata T
  JSDB Autumn Symposium 2018, 24 Nov. 2018, Poster presentation
  Okazaki Conference Center
• 生命現象の解析〜「分かる」を形にする、「分からない」をあぶり出す
  Tasaki S
  データサイエンスが切り拓く生命科学・生体工学の未来, 26 Sep. 2018
  Graduate School of Engineering Science, Osaka University, [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  Physical Biology Laboratory Seminar, 22 Mar. 2018
  RIKEN CDB
• Morphologies and cellular diversity of Bacillus subtilis commuinities
  Tasaki S
  新学術領域「細胞社会ダイバーシティーの統合的解明と制御」第1回若手ワークショップ, 05 Mar. 2018
  Hotel New Welcity Yugawara
• Morphologies and cellular diversity of Bacillus subtilis commuinities
  Tasaki S
  新学術領域「細胞社会ダイバーシティーの統合的解明と制御」第1回公開シンポジウム, 18 Feb. 2018, Poster presentation
  Graduate School of Engineering Science, Osaka University
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  Theory of Biomathematics and its Applications XIV - Modelling and Analysis for Structured Population Dynamics and its Applications, Nov. 2017, Invited oral presentation
  Masukawa Hall, Kyoto University, [Invited], [International presentation]
• 枯草菌の集団形態の予測と最適化
  Tasaki S
  土木工学とデータ科学の融合による土木構造物の革新的な健全度診断方法の開発, 24 Oct. 2017
  Ito Campus, Kyushu University, [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  水戸数学・情報数理研究会2017, 19 Aug. 2017
  水戸中央ビル
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  時空間ダイナミクス〜生命現象における時間変化を伴う空間秩序, 02 Jun. 2017
  Nakano Campus, Meiji University, [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  第1回数理物理・統計力学セミナー, 25 May 2017
  Graduate School of Engineering, Tohoku University, [Invited]
• Self-organization of Bacillus subtilis communities responding to environmental pH variation
  Tasaki S
  拡散成分と非拡散成分が共存する反応拡散系がつくるパターン, 12 Feb. 2017
  Kawai Hall, Tohoku University, [Invited]
• Self-organization of Bacillus subtilis communities responding to environmental pH variation
  Tasaki S
  数理科学と生体医工学, 01 Sep. 2016
  Graduate School of Information Science, Tohoku University, [Invited]
• Morphologies of Bacillus subtilis communities responding to environmental variation
  Tasaki S
  The 2016 (26th) annual meeting of the Japanese Society for Mathematical Biology, Sep. 2016, English, Invited oral presentation
  Shiiki Hall, Kyushu University, [Invited], [International presentation]
• Self-organization of microbial communities against environmental pH variation
  Tasaki S; Nakayama M; Shoji Y
  Mathematical Approaches to Medical and Life Sciences, Jun. 2016
  Kawai Hall, Tohoku University, [Invited]
• 枯草菌集団の危機管理戦略と動態予測
  Tasaki S
  One day workshop 〜菌類に係るコロニーパターンの形成メカニズムの解明に向けて〜, 19 Feb. 2016
  Faculty of Science, Chiba University, [Invited]
• Self-organization of microbial communities designed by dose-response relationships
  Tasaki S
  生物の動的集団の形成と制御, Oct. 2015
  Nakano Campus, Meiji University, [Invited]
• 生物の戦略的自己組織化とその予測
  Tasaki S; Nakayama M; Shoji Y
  生物現象におけるパターン形成と数理, Oct. 2015
  RIMS, Kyoto University, [Invited]
• 数理モデルを用いた細菌コロニーの時空間成長予測
  Tasaki S
  第1回東北ドラッグデリバリーシステム研究会・第2回プラズマ遺伝子導入・治療機器研究会「生体システムの定量的解明に基づくドラッグデリバリーシステムの開発」, 10 Aug. 2015
  Tohoku University, [Invited]
• Effective direction of bacterial activity 1: Big difference between "high-resistance" and "insensitivity" of bacteria to environmental pH variation
  Tasaki S; Nakayama M; Shoji Y
  -Interdisciplinary Mathematics toward Smart Innovations- Mini-workshop on Models of Directional Movement and their Analysis, Mar. 2015
  Tohoku University, [Invited]
• Effective direction of bacterial activity 2: Spatio-temporal growth prediction of colonies self-organized by input-saturating positive feedback
  Tasaki S; Nakayama M; Shoji Y
  -Interdisciplinary Mathematics toward Smart Innovations- Mini-workshop on Models of Directional Movement and their Analysis, Mar. 2015
  Tohoku University, [Invited]
• Growth prediction of colonies of motile bacteria
  Tasaki S; Nakayama M; Shoji Y
  -Interdisciplinary Mathematics toward Smart Innovations- Mathematical Approaches to Pattern Formation, Oct. 2014
  Tohoku University, [Invited]
• Structure-preserving discretization
  Tasaki S; Takagi I
  German-Japanese HeKKSaGOn Consortium Summer School @ Goettingen; Inference on Pattern Formation: Applications to Biology and Materials Science, Sep. 2014, English, Public discourse
  Goettingen University
• Practical introduction to numerical methods for diffusion equations
  Takagi I; Tasaki S
  German-Japanese HeKKSaGOn Consortium Summer School @ Goettingen; Inference on Pattern Formation: Applications to Biology and Materials Science, Sep. 2014, English, Public discourse
  Goettingen University
• Prediction of motile bacterial colonies
  Tasaki S; Nakayama M; Shoji Y
  German-Japanese HeKKSaGOn Consortium Summer School @ Goettingen; Inference on Pattern Formation: Applications to Biology and Materials Science, Sep. 2014, English
  Goettingen University, [Invited]
• Prediction of motile bacterial colonies
  Tasaki S; Nakayama M; Shoji Y
  Mini-workshop on Modeling, Simulation & Analysis of Pattern Formation, Jul. 2014
  Tohoku University, [Invited]
• Phase-separating elastic system of mixed lipid bilayers
  Tasaki S
  Forum "Math-for-Industry" 2013: The Impact of Applications on Mathematics, Nov. 2013, English
  Kyushu University, [Invited], [International presentation]
• Phase-separating elastic system of mixed lipid bilayers
  Tasaki S
  BioQuant Seminars, 17 Sep. 2013
  BioQuant, Heidelberg University, [Invited]
• Interactions between heat, phase, deformation, chemical reaction, and biological movement
  Tasaki S
  HeKKSaGOn Satellite Workshop, Sep. 2013
  Goettingen University
• 相分離弾性系とその分岐・安定性解析
  Tasaki S
  第6回 Math Mate セミナー, 30 Apr. 2013
  AIMR, Tohoku University, [Invited]
• Phase-separating elastic system of mixed lipid bilayers
  Tasaki S
  東北大学 SMART セミナー, 12 Apr. 2013
  Tohoku University
• 混合脂質二重膜の相分離弾性系とその分岐・安定性解析
  Tasaki S
  第5回福島応用数学研究集会, Mar. 2013
  コラッセふくしま, [Invited]
• Second gradient energy-induced secondary bifurcations of steady states in phase-separating elastic systems
  Tasaki S
  The 14th Northeastern Symposium on Mathematical Analysis, Feb. 2013, English
  Tohoku University
• Second gradient energy-induced secondary bifurcations of steady states in phase-separating elastic systems
  Tasaki S
  Tohoku University Applied Mathematics Seminar, 11 Oct. 2012
  Tohoku University
• Phase-separating elastic system of mixed lipid bilayers
  Tasaki S
  第7回大阪大学非線形テクノサイエンス講演会, 22 Feb. 2012
  Osaka University
• 混合脂質二重膜の相分離弾性系
  Tasaki S
  KSU Nonlinear Analysis Seminar, 21 Feb. 2012
  Kyoto Sangyo University, [Invited]
• Phase-separating elastic system of mixed lipid bilayers
  Tasaki S
  京都駅前セミナー, 09 Dec. 2011
  Campus Plaza Kyoto, [Invited]
• Stationary solutions to a strain-gradient type thermoviscoelastic system
  Tasaki S
  Analysis of non-equilibrium evolution problems: selected topics in material and life sciences, Nov. 2011, English, Invited oral presentation
  Eindhoven University of Technology, Eindhoven, The Netherlands, [Invited], [International presentation]
• Formation and coarsening of microdomains in a mathematical model of mixed lipid bilayers
  Tasaki S
  Analysis of non-equilibrium evolution problems: selected topics in material and life sciences, Nov. 2011, English, Poster presentation
  Eindhoven University of Technology, Eindhoven, The Netherlands, [Invited], [International presentation]
• ある歪み勾配型熱粘弾性系における定常状態とその安定性
  Tasaki S
  変分問題セミナー, Mar. 2011
  Tokyo Metropolitan University, [Invited]
• 生体膜上の側方拡散における曲率の効果
  Saitou T; Tasaki S
  第6回大阪大学非線形テクノサイエンス講演会, Mar. 2011
  Osaka University Nakanoshima Center
• Mathematical Analysis of Microdomain Formation in Mixed Lipid Bilayer Membranes
  Tasaki S; Saitou T
  第6回大阪大学非線形テクノサイエンス講演会, Mar. 2011
  Osaka University Nakanoshima Center
• Stationary states and their stability in a strain-gradient type thermoviscoelastic system
  Tasaki S
  第10回松山解析セミナー, Feb. 2011
  Ehime University, [Invited]
• Stationary states and their stability in a strain-gradient type thermoviscoelastic system
  Tasaki S
  大阪市立大学数学研究所「複素解析セミナー」, 02 Dec. 2010
  Osaka City University
• Stationary states and their stability in a strain-gradient type thermoviscoelastic system
  Tasaki S
  Regularity aspects of PDE - a week for Wojciech Zajaczkowski, Sep. 2010, English, Invited oral presentation
  Bedlewo Conference Center, Polish Academy of Sciences, Poland, [Invited], [International presentation]
• Hamilton formalism to compressible non-viscous fluid equations and application
  Murakami T; Suzuki T; Tasaki S
  The 59th NCTAM, Jun. 2010
  Science Council of Japan
• Pawlow's System on Thermoelastic Bodies with Shape Memory
  Tasaki S
  第5回大阪大学非線形テクノサイエンス講演会, Mar. 2010
  Osaka University
• Stationary solutions to the Pawlow system on shape memory materials
  Tasaki S
  The Mathematical Society of Japan. Annual Meeting 2010, Mar. 2010
  Keio University
• Stationary solutions to the Pawlow system on shape memory materials
  Tasaki S
  Second Workshop on Mathematical Science and Nonlinear Partial Differential Equations, 06 Feb. 2010
  Osaka University
• Stationary solutions to the Falk system on shape memory alloys
  Tasaki S
  The Mathematical Society of Japan. Autumn Meeting 2009, Sep. 2009
  Osaka University
• Stationary Fix-Caginalp equation with non-local term
  Tasaki S
  京都駅前セミナー, 22 May 2009
  Campus Plaza Kyoto, [Invited]
• Stationary Solutions to the Falk System on Shape Memory Alloys
  Tasaki S
  第4回大阪大学非線形テクノサイエンス講演会, Mar. 2009
  Osaka University
• Nonlocal eigenvalue problems in phase transition
  Tasaki S
  Workshop on Mathematical Science and Nonlinear Partial Differential Equations, 14 Feb. 2009
  Osaka University
• Stationary Fix-Caginalp equation with non-local term
  Tasaki S
  若手のための偏微分方程式と数学解析, Feb. 2009
  Kyushu University, [Invited]
• Stationary Fix-Caginalp equation with non-local term
  Tasaki S
  変分問題セミナー, Jan. 2009
  Tokyo Metropolitan University, [Invited]
• Stationary Fix-Caginalp equation with non-local term
  Tasaki S
  Workshop on Stationary Problems in Nonlinear Partial Differential Equations, Dec. 2008
  Kobe University, [Invited]
• Stationary Fix-Caginalp equation with non-local term
  Tasaki S
  大阪大学数学教室微分方程式セミナー, 28 Nov. 2008
  Osaka University
• Stationary Fix-Caginalp equation with non-local term
  Tasaki S
  The Mathematical Society of Japan. Autumn Meeting 2008, 26 Sep. 2008
• Stationary Fix-Caginalp equation with non-local term
  Tasaki S
  Third Euro-Japan Workshop on blow-up, 09 Sep. 2008, English, Poster presentation
  Tohoku University, [International presentation]
• Steady states for the Falk model system of shape memory alloys
  Tasaki S
  第3回大阪大学非線形テクノサイエンス講演会, Mar. 2008
  Senri Life Science Center
• Caginalp-Fix 方程式の定常問題
  Tasaki S
  第30回上越教育大学における微分方程式セミナー, Aug. 2007
  Joetsu University of Education
• Stationary problems for non-isothermal phase transition models
  Tasaki S; Suzuki T
  第2回大阪大学非線形テクノサイエンス講演会, Mar. 2007
  Senri Life Science Center

• 数理解析学講義, 2024年, 修士課程, 理学院
• 入門微分積分学, 2024年, 学士課程, 全学教育
• 基礎数学演習Ｃ２, 2024年, 学士課程, 理学部
• 基礎数学Ｃ２, 2024年, 学士課程, 理学部
• 微分積分学Ⅰ, 2024年, 学士課程, 全学教育
• 数理科学Ｂ, 2024年, 学士課程, 理学部
• 基礎数学演習Ｃ, 2024年, 学士課程, 理学部
• 基礎数学Ｃ, 2024年, 学士課程, 理学部

• THE MATHEMATICAL SOCIETY OF JAPAN
• THE JAPAN SOCIETY FOR INDUSTRIAL AND APPLIED MATHEMATICS

• Construction and analysis of a hybrid mathematical model describing the dynamics of bacterial cellular society
  JSPS Kakenhi
  Apr. 2023 - Mar. 2026
  Sohei Tasaki
  JSPS, Grant-in-Aid for Scientific Research(C), Hokkaido University, Principal investigator, 23K03208
• Creation of multilevel model for predicting self-organization of bacterial population
  Grant-in-Aid for Scientific Research (C)
  Apr. 2019 - Mar. 2023
  Tasaki S
  Japan Society for the Promotion of Science, Principal investigator, Competitive research funding
• Integrated analysis and regulation of cellular diversity for disease treatment
  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
  Jun. 2017 - Mar. 2022
  Fujita N
  Ministry of Education, Culture, Sports, Science and Technology, Competitive research funding
• Prediction and control of biological self-organization dynamics
  Research Fellow Grant
  Apr. 2013 - Mar. 2018
  Tasaki S
  Frontier Research Institute for Interdisciplinary Sciences (FRIS), Tohoku University, Principal investigator, Competitive research funding
• 数理解析による神経パターン形成機構の解明
  Program for Creation of Interdisciplinary Research
  Apr. 2014 - Mar. 2016
  Shoji W
  Frontier Research Institute for Interdisciplinary Sciences (FRIS), Tohoku University, Competitive research funding
• Stationary states and their stability in mathematical models of phase transition and shape memory materials
  Grant-in-Aid for JSPS Research Fellows
  Apr. 2010 - Mar. 2012
  Tasaki S
  非平衡熱力学に現れる数理モデルの研究を行った.特に,申請者が形状記憶合金の数理モデルにおいて得ていた結果が普遍的に成り立つものであることを示した.そのために,形状記憶物質やポリマー物質を含む,広範な熱弾性体に関する熱力学的に矛盾のないシステムを構築した.このシステムにおいて,対象に応じて自由エネルギーおよび散逸ポテンシャルを適当に設定することでモデル方程式が導出される.この一般的なシステムにおいて,二つの双対的な変分構造があり,その間に安定性に関する比較構造が存在することを示した.この結果は例えば,保存系では温度ではなく保存量が定常状態の安定性を定めていることを意味しているが,各々のモデル方程式を分岐理論などを用いて詳しく解析していくときに応用することもできる重要なものである.
  脂質二重膜における微小ドメインの形成は,生体膜においても重要な役割を担っていると考えられている.このような脂質二重膜内の形態を考察するため,相分離する弾性膜を記述するシステムを考え,数値計算および数学的解析を行った.弾性的相互作用が膜内ドメイン構造を作り,二層間相互作用が脂質組成の対称・非対称を制御している.適当に単純化したシステムを定式化し,得られる定常状態に関するいくつかの数学的性質を明らかにした.特に,定常解の二次分岐構造を提示し,この構造によって弾性的相互作用が膜内ドメイン構造を安定化していることを明らかにした.
  Japan Society for the Promotion of Science, 特別研究員奨励費, 大阪大学, Principal investigator, Competitive research funding, 10J01460
• Analysis for nonlinear critical phenomena described by mean field equations
  Grants-in-Aid for Scientific Research
  2008 - 2012
  SUZUKI Takashi; MISAWA Masashi; TAKAHASHI Futoshi; NAITO Yuki; OHTSUKA Hiroshi; SUGIYAMA Yoshie; ISHIWATA Michinori; KOBAYASHI Takayuki; NAWA Hayato; WATANABE Kazuo; SATO Tomohiko; MATSUMURA Akitaka; YAGI Atsushi; MISAWA Masashi; TAKAHASHI Futoshi; NAITO Yuki; OHTSUKA Hiroshi; SUGIYAMA Yoshie; KOBAYASHI Takayuki; NAWA Hayato; WATANABE Kazuo; SATO Tomohiko; MATSUMURA Akitaka; YAGI Atsushi; YOSHIKAWA Shuji; KUROKIBA Masaki; FURIHATA Daisuke; KUWATA Kazuhiro; TANAKA Mieko; YAMADA Yoshio; SAITO Norikazu; TAKAHASHI Ryo; TASAKI Sohei; RICCIARDI Tonia; STEVENS Angela; KAVALLARIS Nikos; PAWLOW Irena; CHAPLAIN Mark; QUARANTA Vito; CHAVANIS Pierre-henri
  Several common mathematical structures are found in the models describing the motion of mean field of many particles, point vortices, and so on. In this project we focused on a series of nonlinear partial differential equations provides with scaling invariance, and also variational structure associated with a variable regarded as field. We rigorously proved several phenomena emerged from the model, such as concentration or homeostasis, and at the same time developed new mathematical tools to approach interactions between species and global dynamics under strong nonlinearities
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Osaka University, 20340034

• 北海道札幌月寒高等学校 探究学習プロジェクト 2023 BEING ALIVE Ⅰ
  04 Oct. 2023 - 11 Oct. 2023
  Lecturer
• 令和５年度札幌啓成高校SSH事業 北海道大学研修（理学部数学科）「成長と増殖の数学」
  09 Sep. 2023 - 09 Sep. 2023
  Lecturer, Demonstrator
• 「角度を変えないで写す」、「地図と折り紙」
  17 Aug. 2014 - 19 Aug. 2014
  Lecturer, Demonstrator, Others
  主催：公益財団法人川井数理科学財団 協賛：ジブラルタ生命保険会社・東北大学大学院理学研究科
  第21回 〜高校生のための〜 仙台数学セミナー「複素数で遊ぶ」
  第21回高校生のための「仙台数学セミナー」にて講師を担当した。

• Feb. 2025 - Feb. 2025
  [Organizing Committee] The 26th Northeastern Symposium on Mathematical Analysis
• Jan. 2022 - Jan. 2022
  [世話人] 新学術領域「細胞社会ダイバーシティーの統合的解明と制御」第4回若手ワークショップ
• Dec. 2020 - Dec. 2020
  [Organizer] 第43回日本分子生物学会年会 ワークショップ 1AW-11 「細胞運命ダイナミクスの定量的理解と操作の実現に向けて」
• Sep. 2020 - Sep. 2020
  [Organizing Committee] 2nd ASHBi Mathematical Biology Workshop
• Apr. 2015 - Mar. 2018
  [Organizer] Collaborative Mathematics Seminar (Tohoku University)
• Apr. 2014 - Mar. 2018
  [世話人] 全領域合同研究交流会（東北大学）
• Apr. 2013 - Mar. 2018
  [Steering Committee] Applied Mathematics Forum (Tohoku University)
• Apr. 2015 - Apr. 2015
  [Organizing Committee] International Conference “Frontiers in Mathematical Sciences”
• Apr. 2013 - Mar. 2014
  [世話人] 縦横無尽に階層・領域をまたぐ融合理工学セミナー（東北大学）
• Mar. 2013 - Mar. 2013
  [Organizing Committee] International Conference “Quantization Blow-up and Concentration in Mathematical Physics View Point”
• Apr. 2012 - Mar. 2013
  [Organizer] Applied Mathematics Seminar (Tohoku University)