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| 題名: | Trajectories of Listeria-type motility in two dimensions |
| 作者: | 温福來;Wen, Fu-Lai;Leung, Kwan-tai;Chen, Hsuan-Yi |
| 貢獻者: | 理學院物理學系 |
| 關鍵詞: | Actins - metabolism;Adenosine Triphosphate - metabolism;Biophysics - methods;Computer Simulation;Fourier Analysis;Hydrolysis;Listeria monocytogenes - cytology;Models, Biological;Models, Statistical;Movement;Polymers - metabolism;Stress, Mechanical;Time Factors |
| 日期: | 2012-12-07 |
| 上傳時間: | 2026-04-23 14:44:55 (UTC+8) |
| 出版者: | American Physical Society;United States |
| 摘要: | 摘要： Force generated by actin polymerization is essential in cell motility and the locomotion of organelles or bacteria such as Listeria monocytogenes. Both in vivo and in vitro experiments on actin-based motility have observed geometrical trajectories including straight lines, circles, S-shaped curves, and translating figure eights. This paper reports a phenomenological model of an actin-propelled disk in two dimensions that generates geometrical trajectories. Our model shows that when the evolutions of actin density and force per filament on the disk are strongly coupled to the disk self-rotation, it is possible for a straight trajectory to lose its stability. When the instability is due to a pitchfork bifurcation, the resulting trajectory is a circle; a straight trajectory can also lose stability through a Hopf bifurcation, and the resulting trajectory is an S-shaped curve. We also show that a half-coated disk, which mimics the distribution of functionalized proteins in Listeria, also undergoes similar symmetry-breaking bifurcations when the straight trajectory loses stability. For both a fully coated disk and a half-coated disk, when the trajectory is an S-shaped curve, the angular frequency of the disk self-rotation is different from that of the disk trajectory. However, for circular trajectories, these angular frequencies are different for a fully coated disk but the same for a half-coated disk.
其他題名： Phys Rev E Stat Nonlin Soft Matter Phys
出版者： United States
出版日期： 2012-12
出處： Physical review. E, Statistical, nonlinear, and soft matter physics, 2012-12, Vol.86 (6), p.061902, Article 061902
識別號： ISSN: 1539-3755
識別號： ISSN: 1550-2376
識別號： EISSN: 1550-2376
識別號： DOI: 10.1103/PhysRevE.86.061902
識別號： PMID: 23367971 |
| 顯示於類別: | [物理學系] 期刊論文
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