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

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.

SUBMITTER: Yamamoto E 

PROVIDER: S-EPMC4351557 | biostudies-literature | 2015 Mar

REPOSITORIES: biostudies-literature