2017 Fiscal Year Final Research Report
Non-equilibrium dynamics of bio-matter driven by non-thermal fluctuations
| Project Area | Synergy of Fluctuation and Structure:Foundation of Universal Laws in Nonequilibrium Systems |
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| Project/Area Number |
25103011
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
水野 大介 九州大学, 理学研究院, 准教授 (30452741)
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| Project Period (FY) |
2013-06-28 – 2018-03-31
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| Keywords | マイクロレオロジー / 非熱的ゆらぎ / フィードバックマイクロレオロジー / 細胞 / 混み合い効果 / 液晶電気対流 / アクティブ拡散 |
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| Outline of Final Research Achievements |
We experimentally study fluctuation and mechanical response in bio-matter and its model system driven by non-thermal field at mesoscopic scale.
A new measurement method of microrheology which is able to measure the local mechanical properties of bio-matter even in flow and with large fluctuation is developed using multiple feedback method. This method is applied to living cells and cell extracts. It is revealed that the cytoplasm is vitrified by crowding, but the interior of the cell is fluidized by metabolic activity.
We also study the fluctuation and dynamics of electro-convection in liquid crystals and bacteria bath as typical active fluids. In the former system, the relationship between the active diffusion constant and the degree of non-equilibrium is clarified. In the latter system, the distribution of fluctuation is found to vary from Gaussian to Levy with change in the size of the system and the concentration of bacteria.
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| Free Research Field |
物性物理学
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