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- W2055961031 abstract "Owing to the development of single-particle tracking techniques, it is able to observe real-time diffusive motions of labelled tiny particles in living cells. To quantify the diffusion trajectories, the mean-squared displacement (MSD) analysis is common and conventional. The diffusion coefficient quantified by the analysis is a good barometer of the mobility. But, in terms of statistical physics, equilibrium and stationarity are assumed in the MSD analysis. Accordingly, the analysis depends on the statistical ensemble. When diffusive motions are driven by non-equilibrium and non-stationary fluctuations as the outcome of biological activity, such fluctuations are averaged and neglected in the MSD analysis. Such enhanced diffusive motion is called active diffusion. To understand the interaction among diffusive motion, biological activity, and environment in detail, we should develop a new diffusion analysis theory beyond the MSD analysis.Hence, our subject is not an ensemble of diffusion trajectories, only individual ones. The MSD analysis is based on the hypothesis of a stationary stochastic process, but our theory is based on stochastic energetics, which is thermodynamics in fluctuating small world.Here, I will show energetics of single active diffusion trajectories, where the instantaneous diffusion coefficient (IDC) as a new diffusion analysis quantity is derived. Considering decomposition of energy dissipation in a non-equilibrium steady state, we can make implication of the IDC clear. An advantage of our theory is to be able to discuss the meso scale energetics from only single-particle tracking data without measuring response." @default.
- W2055961031 created "2016-06-24" @default.
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- W2055961031 date "2015-01-01" @default.
- W2055961031 modified "2023-09-26" @default.
- W2055961031 title "Quantitative Theory of Active Diffusion Trajectories by Instantaneous Diffusion Coefficient" @default.
- W2055961031 doi "https://doi.org/10.1016/j.bpj.2014.11.2578" @default.
- W2055961031 hasPublicationYear "2015" @default.
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