Origin of 1/f noise in hydration dynamics on lipid membrane surfaces

Scientific Reports
Eiji YamamotoKenji Yasuoka

Abstract

Water molecules on lipid membrane surfaces are known to contribute to membrane stability by connecting lipid molecules and acting as a water bridge. Although water structures and diffusivities near the membrane surfaces have been extensively studied, hydration dynamics on the surfaces has remained an open question. Here we investigate residence time statistics of water molecules on the surface of lipid membranes using all-atom molecular dynamics simulations. We show that hydration dynamics on the lipid membranes exhibits 1/f noise. Constructing a dichotomous process for the hydration dynamics, we find that residence times in each state follow a power-law with exponential cutoff and that the process can be regarded as a correlated renewal process where interoccurrence times are correlated. The results imply that the origin of the 1/f noise in hydration dynamics on the membrane surfaces is a combination of a power-law distribution with cutoff of interoccurrence times of switching events and a long-term correlation between the interoccurrence times. These results suggest that the 1/f noise attributed to the correlated renewal process may contribute to the stability of the hydration layers and lipid membranes.

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Citations

Dec 15, 2015·Scientific Reports·Eiji YamamotoMark S P Sansom
Sep 28, 2017·Physical Review. E·Avinash Chand YadavDeepak Dhar
Sep 27, 2018·Physical Review. E·Yoshiyuki Y Yamaguchi, Kunihiko Kaneko

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