Origin of the lognormal shape in the boson-peak of globular proteins

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Abstract

We propose an explanation for the origin of the lognormal shape in the boson-peak anomaly of globular proteins. The origin is ascribed to a distribution of quasi-localization lengths for acoustic waves within the protein. The local densities of states for different sites display logarithmic singularities in this range. The distribution of these singularities, however, follows a lognormal distribution. This seems to be a universal characteristic for quasi-two dimensional random networks, which are used to model the protein dynamics. This interpretation makes explicit contact with well established models for the boson-peak anomaly in glasses and/or amorphous solids. © 2001 Elsevier Science B.V.

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Nöllmann, M., & Etchegoin, P. (2001). Origin of the lognormal shape in the boson-peak of globular proteins. Physica A: Statistical Mechanics and Its Applications, 294(1–2), 44–50. https://doi.org/10.1016/S0378-4371(01)00124-8

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