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A dynamical transition of a chain of charged particles in a 2D substrate potential

Communications in Theoretical Physics 2020年第7期72卷 116-122页

作者： Xiao-Ping Yuan Li-Yan Qiao Xia Huang Information Engineering School Hangzhou Dianzi UniversityHangzhou 310018China Department of Physics Hangzhou Dianzi UniversityHangzhou 310018China School of Mathematics and Physics North China Electric Power UniversityBeijing 102206China

The transport of a chain of charged particles with a transverse degree of freedom is investigated in a 2D asymmetric ***,the energy of the periodic driving force is converted into motion in the vertical *** analysis exhibits a transition from stick-slip motion to periodic *** chain velocity can be controlled to an optimized value by adjusting system parameters,such as the amplitude and frequency of the periodic *** existence of a resonance platform indicates resonance between the motion of the chain and the periodic force as coupling strength increases *** atomic configuration and the transverse degree of freedom also play key roles in the control.

关键词： collective transport driven Frenkel–Kontorova model cooperative ratchet

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Effects of rebinding rate and asymmetry in unbinding rate on cargo transport by multiple kinesin motors

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Communications in Theoretical Physics 2021年第1期73卷 106-116页

作者： Yao Wang Yu-Ying Liu Jian Liang Peng-Ye Wang Ping Xie College of Engineering and College of Science China Agricultural UniversityBeijing 100083China Key Laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Many intracellular transports are performed by multiple molecular motors in a cooperative ***,we use stochastic simulations to study the cooperative transport by multiple kinesin motors,focusing mainly on effects of the form of unbinding rate versus force and the rebinding rate of single motors on the cooperative *** consider two forms of the unbinding *** is the symmetric form with respect to the force direction,which is obtained according to Kramers *** other is the asymmetric form,which is obtained from the prior studies for the single kinesin *** the asymmetric form the simulated results of both velocity and run length of the cooperative transport by two identical motors and those by a kinesin-1 motor and a kinesin-2 motor are in quantitative agreement with the available experimental data,whereas with the symmetric form the simulated results are inconsistent with the experimental *** the cooperative transport by a faster motor and a much slower motor,the asymmetric form can give both larger velocity and longer run length than the symmetric form,giving an explanation for why kinesin adopts the asymmetric form of the unbinding rate rather than the symmetric *** the cooperative transport by two identical motors,while the velocity is nearly independent of the rebinding rate,the run length increases linearly with the rebinding *** the cooperative transport by two different motors,the increase of the rebinding rate of one motor also enhances the run length of the cooperative *** dynamics of transport by N(N=3,4,5,6,7 and 8)motors is also studied.

关键词： molecular motors collective transport kinesin

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