弹性耦合双头分子马达的一维hand-over-hand模型  

One-dimensional Model for Hand-over-hand Motion of Elastically Coupled Molecular Motors

作　　者：张红卫[1,2] 赵阿可[3] 李涛[2] 李玉晓[2] 

机构地区：[1]郑州师范学院物理与电子工程学院,河南郑州450044 [2]郑州大学物理工程学院,河南郑州450001 [3]洛阳师范学院物理与电子信息学院,河南洛阳471022

出　　处：《郑州大学学报（理学版）》2014年第4期49-53,共5页Journal of Zhengzhou University:Natural Science Edition

基　　金：河南省科技厅基础与前沿技术研究计划项目;编号1423004110096;河南省教育厅科学技术研究重点项目;编号14A140007

摘　　要：研究了棘轮势作用下弹性耦合双头分子马达的一维hand-over-hand模型.马达与轨道的相互作用受控于两个非对称势的开与关,通过数值模拟得到马达的运动轨迹符合hand-over-hand模型特征.此外,研究了负载存在与否两种条件下,马达效率随各种参数的变化.不加负载时,随着不对称势关闭时间toff的逐渐增大,效率总体上呈现增加趋势;加负载时,效率随负载由负向到正向的增加,先呈现出逐渐增大的趋势,并最终达到稳定值;不同的温度D、弹性系数k以及不对称势关闭时间toff条件下,效率随颈部原长a的增大呈现出相似的周期性变化.研究结果表明,马达效率的大小受制于上述诸因素的共同影响.A flashing ratchet model in one dimension was studied to simulate the hand-over-hand motion of elastically coupled molecular motors. The action between motor and its track was controlled by the two asymmetric periodic potentials. By numerical simulations,the trajectories of the two heads showed handover-hand motion. In addition,efficiency of center of mass with or without external load was discussed.Without the load,efficiency enlarged versus time toff,but it increased and reached a steady value with the load increasing from negative to plus direction. Efficiency as a function of initial length of the neck a showed similar periodic results for different parameters,such as the temperature D,the spring constant k and time toff. The study indicated that the efficiency was the result of above parameters＇ cooperation and competition.

关 键 词：分子马达 弹性耦合 不对称周期势 效率 

分 类 号：O552.1[理学—热学与物质分子运动论]