2,548 research outputs found
Efficiency at maximum power of motor traffic on networks
We study motor traffic on Bethe networks subject to hard-core exclusion for
both tightly coupled one-state machines and loosely coupled two-state machines
that perform work against a constant load. In both cases we find an
interaction-induced enhancement of the efficiency at maximum power (EMP) as
compared to non-interacting motors. The EMP enhancement occurs for a wide range
of network and single motor parameters and is due to a change in the
characteristic load-velocity relation caused by phase transitions in the
system. Using a quantitative measure of the trade-off between the EMP
enhancement and the corresponding loss in the maximum output power we identify
parameter regimes where motor traffic systems operate efficiently at maximum
power without a significant decrease in the maximum power output due to jamming
effects.Comment: 9 pages, 9 figures, submitted to Phys. Rev.
Maximum power operation of interacting molecular motors
We study the mechanical and thermodynamic properties of different traffic
models for kinesin which are relevant in biological and experimental contexts.
We find that motor-motor interactions play a fundamental role by enhancing the
thermodynamic efficiency at maximum power of the motors, as compared to the
non-interacting system, in a wide range of biologically compatible scenarios.
We furthermore consider the case where the motor-motor interaction directly
affects the internal chemical cycle and investigate the effect on the system
dynamics and thermodynamics.Comment: 19 pages, 22 figure
Efficiency of molecular machines with continuous phase space
We consider a molecular machine described as a Brownian particle diffusing in
a tilted periodic potential. We evaluate the absorbed and released power of the
machine as a function of the applied molecular and chemical forces, by using
the fact that the times for completing a cycle in the forward and the backward
direction have the same distribution, and that the ratio of the corresponding
splitting probabilities can be simply expressed as a function of the applied
force. We explicitly evaluate the efficiency at maximum power for a simple
sawtooth potential. We also obtain the efficiency at maximum power for a broad
class of 2-D models of a Brownian machine and find that loosely coupled
machines operate with a smaller efficiency at maximum power than their strongly
coupled counterparts.Comment: To appear in EP
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