Quest for universal description of collective motion of active matter

• Project/Area Number: 17K17761
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Mathematical physics/Fundamental condensed matter physics; Biological physics/Chemical physics/Soft matter physics
• Research Institution: Japan Advanced Institute of Science and Technology
• Principal Investigator: Nagai Ken 北陸先端科学技術大学院大学, 先端科学技術研究科, 講師 (40518932)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: アクティブマター / 集団運動 / クラミドモナス / C. elegans / 生物物理 / 数理物理

Outline of Final Research Achievements

Collective motions of animate nematodes and inanimate rod-shaped molecules driven by molecular motors were studied in this project. We found that collective motions of these two different active matters under various conditions are described by a common description.
Chlamydomonas and cell model of Chlamydomonas were also studied. We found the same purely hydrodynamically originated behaviors observed both in the Chlamydomonas case and the cell model case. In addition, the behaviors caused by life activities of Chlamydomonas were clarified.

Academic Significance and Societal Importance of the Research Achievements

生物と非生物を使った研究により、自発的に運動する物の集団が見せる挙動の中には生きているかなどの系の詳細にはよらない原理に支配されたものがあることがわかった。また逆に生き物が見せる運動の特徴を炙り出すことができた。本研究のこれらの結果は自発的な運動に関する包括的な理解を進め、アクティブマターの物理が目指す目標の一つである集団運動の統一的理解に一歩近づくことができた。また、同時に生き物の統一的理解という生物物理の一つの大きなテーマに対して大きな知見を与えることができた。

Research Products

• [Int'l Joint Research] CEA Saclay(フランス)
• [Journal Article] 最近の研究から アクティブマター集団の動的ネットワーク形成 : 線虫の集団運動 (2020)
  • Author(s): 永井 健, 伊藤 浩史, 杉 拓磨
  • Journal Title: 日本物理学会誌 Volume: 75 Pages: 34-39
  • Peer Reviewed
• [Journal Article] Pattern Formations in Active Matter Physics (2020)
  • Author(s): SUGI Takuma、ITO Hiroshi、NAGAI Ken H.
  • Journal Title: Seibutsu Butsuri Volume: 60 Issue: 1 Pages: 006-012
  • DOI: 10.2142/biophys.60.006
  • NAID: 130007790196
  • ISSN: 0582-4052, 1347-4219
  • Peer Reviewed / Open Access
• [Journal Article] C. elegans collectively forms dynamical networks (2019)
  • Author(s): Sugi Takuma、Ito Hiroshi、Nishimura Masaki、Nagai Ken H.
  • Journal Title: Nature Communications Volume: 10 Issue: 1 Pages: 683-683
  • DOI: 10.1038/s41467-019-08537-y
  • NAID: 120006558249
  • Peer Reviewed / Open Access
• [Journal Article] Controlled Construction of Stable Network Structure Composed of Honeycomb-Shaped Microhydrogels (2018)
  • Author(s): Masayuki Hayakawa, Satoshi Umeyama, Ken Nagai, Hiroaki Onoe, Masahiro Takinoue
  • Journal Title: Life Volume: 8 Issue: 4 Pages: 38-38
  • DOI: 10.3390/life8040038
  • Peer Reviewed / Open Access
• [Presentation] Collective motion of C. elegans (2020)
  • Author(s): Ken H. Nagai
  • Organizer: Active Matter Workshop 2020
  • Int'l Joint Research
• [Presentation] 交流電場によるリポソームの自発遊泳 (2018)
  • Author(s): 永井健, 東彰大, 濱田勉
  • Organizer: 日本物理学会第７３回年次大会
• [Presentation] Dynamical network structure in C. elegans group (2017)
  • Author(s): Ken Nagai, Hiroshi Ito, Takuma Sugi
  • Organizer: 第５５回日本生物物理学会
  • Int'l Joint Research
• [Presentation] C. elegans集団の動的ネットワークの外部刺激応答 (2017)
  • Author(s): 永井健, 伊藤浩史, 杉拓磨
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] C. elegansの動的ネットワークの自己組織化 (2017)
  • Author(s): 永井健, 伊藤浩史, 杉拓磨
  • Organizer: 細胞を作る研究会10.0
• [Remarks] 動物はどのように秩序だった群れをつくるのか?アクティブマターの物理で迫る、線虫の群れ形成メカニズム
  • URL: https://academist-cf.com/journal/?p=10328
• [Remarks]
  • URL: https://sites.google.com/site/inonakanokaeru/home
• [Remarks]
  • URL: https://sites.google.com/site/inonakanokaeru/