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- Kumiko Hayashi, Shin-ichi Sasa
- Physical review. E, Statistical, nonlinear, and…
- 2004

We theoretically study Langevin systems with a tilted periodic potential. It is known that the ratio Theta of the diffusion constant D to the differential mobility mu(d) is not equal to the temperature of the environment (multiplied by the Boltzmann constant), except in the linear response regime, where the fluctuation dissipation theorem holds. In order to… (More)

- Kumiko Hayashi, Hiroshi Ueno, Ryota Iino, Hiroyuki Noji
- Physical review letters
- 2010

In recent years, theories of nonequilibrium statistical mechanics such as the fluctuation theorem (FT) and the Jarzynski equality have been experimentally applied to micro and nanosized systems. However, so far, these theories are seldom applied to autonomous systems such as motor proteins. In particular, representing the property of entropy production in a… (More)

- Rikiya Watanabe, Kumiko Hayashi, Hiroshi Ueno, Hiroyuki Noji
- Biophysical journal
- 2013

Protein conformational fluctuations modulate the catalytic powers of enzymes. The frequency of conformational fluctuations may modulate the catalytic rate at individual reaction steps. In this study, we modulated the rotary fluctuation frequency of F1-ATPase (F1) by attaching probes with different viscous drag coefficients at the rotary shaft of F1.… (More)

- Kumiko Hayashi, Mitsunori Takano
- Biophysical journal
- 2007

We report the results of molecular dynamics simulations of the protein myosin carried out with an elastic network model. Quenching the system, we observe glassy behavior of a density correlation function and a density response function that are often investigated in structure glasses and spin glasses. In the equilibrium, the fluctuation-response relation, a… (More)

We demonstrate that a Langevin equation that describes the motion of a Brownian particle under non-equilibrium conditions can be exactly transformed to a special equation that explicitly exhibits the response of the velocity to a time dependent perturbation. This transformation is constructed on the basis of an operator formulation originally used in… (More)

The Green-Kubo relation, the Einstein relation, and the fluctuation-response relation are representative universal relations among measurable quantities that are valid in the linear response regime. We provide pedagogical proofs of these universal relations for stochastic many-body systems. Through these simple proofs, we characterize the three relations as… (More)

Directional cell movement is a fundamental phenomenon exhibited by many biological processes. It has been known that an electric field exists on the surfaces of the tissues of organisms and that it acts as a directional cue for the type of the cell migration known as electro-taxis. Electrotaxis is thought to play important roles in various physiological… (More)

- Kumiko Hayashi, Shin-Ichi Sasa
- Physical review. E, Statistical, nonlinear, and…
- 2005

We carry out numerical experiments on a one-dimensional driven lattice gas to elucidate the statistical properties of steady states far from equilibrium. By measuring the bulk density diffusion constant D, the conductivity sigma, and the intensity of density fluctuations, chi, we confirm that the Einstein relation Dchi=sigmaT, which is valid in the linear… (More)

– We propose a method for computing the Kolmogorov-Sinai (KS) entropy of chaotic systems. In this method, the KS entropy is expressed as a statistical average over the canonical ensemble for a Hamiltonian with many ground states. This Hamiltonian is constructed directly from an evolution equation that exhibits chaotic dynamics. As an example, we compute the… (More)

- Kumiko Hayashi, Mizue Tanigawara, Jun-ichi Kishikawa
- Biophysics
- 2012

The fluctuation theorem (FT), which is a recent achievement in non-equilibrium statistical mechanics, has been suggested to be useful for measuring the driving forces of motor proteins. As an example of this application, we performed single-molecule experiments on F1-ATPase, which is a rotary motor protein, in which we measured its rotary torque by taking… (More)