arXivDaily arXiv每日学术速递 周一至周五更新
arXiv physics/0603273physics.bio-ph
收藏

纤毛阵列中宏观流动和异时波的自发产生

Spontaneous creation of macroscopic flow and metachronal waves in an array of cilia

Boris Guirao, Jean-François Joanny

摘要:

细胞或细菌携带纤毛在其表面上显示出许多惊人的功能:纤毛排列在一个数组中,两个阶段的不对称跳动的每一个纤毛,纤毛之间的协调和异时波的存在与两个相邻的纤毛之间的恒定相位差。我们给出了简单的理论参数的基础上的流体动力学耦合和内部机制的纤毛来自一个集合的分子马达的行为,定性地解释这些合作功能。流体动力学的相互作用可以导致纤毛阵列的排列。我们研究了横向外部流的影响,并获得了一个两相不对称的跳动,更快的沿流和较慢的对流,进行周围的平均弯曲位置。我们表明,一个对齐的阵列纤毛是能够自发地打破左右对称,并创建一个全球平均流量。异时性作为跳动阈值的局部最小值而出现,并导致相当恒定的流动。

英文摘要:

Cells or bacteria carrying cilia on their surface show many striking features : alignment of cilia in an array, two-phase asymmetric beating for each cilium, coordination between cilia and existence of metachronal waves with a constant phase difference between two adjacent cilia. We give simple theoretical arguments based on hydrodynamic coupling and an internal mechanism of the cilium derived from the behavior of a collection of molecular motors, to account qualitatively for these cooperative features. Hydrodynamic interactions can lead to the alignment of an array of cilia. We study the effect of a transverse external flow and obtain a two-phase asymmetrical beating, faster along the flow and slower against the flow, proceeding around an average curved position. We show that an aligned array of cilia is able to spontaneously break the left-right symmetry and to create a global average flow. Metachronism arises as a local minimum of the beating threshold and leads to a rather constant flow.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑