期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.058001
关键词
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资金
- National Natural Science Foundation of China [12074243, 11774222]
- Program for Professor of Special Appointment at Shanghai Institutions of Higher Learning [GZ2016004]
- Student Innovation Center at Shanghai Jiao Tong University
By studying how light polarization affects the motion of photoresponsive algae Euglena gracilis, it was found that cells exhibit different motion patterns under different light polarization conditions. Experimental results demonstrate that ordered cell swimming can generate directed transporting fluid flow.
We investigate how light polarization affects the motion of photoresponsive algae, Euglena gracilis. In a uniformly polarized field, cells swim approximately perpendicular to the polarization direction and form a nematic state with zero mean velocity. When light polarization varies spatially, cell motion is modulated by local polarization. In such light fields, cells exhibit complex spatial distribution and motion patterns which are controlled by topological properties of the underlying fields; we further show that ordered cell swimming can generate directed transporting fluid flow. Experimental results are quantitatively reproduced by an active Brownian particle model in which particle motion direction is nematically coupled to local light polarization.
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