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- W2328018723 abstract "A detailed quantitative analysis of the specific heat in the 0.5- to 200-K temperature range for almost dry L-cysteine and its dimer, L-cystine, amino acids is presented. We report the occurrence of a sharp first-order transition at $ensuremath{sim}76$ K for L-cysteine associated with the thiol group ordering which was successfully modeled with the two-dimensional Ising model. We demonstrated that quantum rotors, two-level systems (TLS), Einstein oscillators, and acoustic phonons (the Debye model) are essential ingredients to correctly describe the overall experimental data. Our analysis pointed out the absence of the TLS contribution to the low temperature specific heat of L-cysteine. This result was similar to that found in other noncrystalline amorphous materials, e.g., amorphous silicon, low density amorphous water, and ultrastable glasses. L-cystine presented an unusual nonlinear acoustic dispersion relation $ensuremath{omega}(q)=v{q}^{0.95}$ and a Maxwell-Boltzmann--type distribution of tunneling barriers. The presence of Einstein oscillators with ${ensuremath{Theta}}_{E}ensuremath{sim}70$ K was common in both systems and adequately modeled the boson peak contributions." @default.
- W2328018723 created "2016-06-24" @default.
- W2328018723 creator A5006422368 @default.
- W2328018723 creator A5034730513 @default.
- W2328018723 creator A5057052081 @default.
- W2328018723 creator A5064248171 @default.
- W2328018723 date "2015-03-23" @default.
- W2328018723 modified "2023-09-27" @default.
- W2328018723 title "Unusual specific heat of almost dry L-cysteine and L-cystine amino acids" @default.
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- W2328018723 doi "https://doi.org/10.1103/physreve.91.032709" @default.
- W2328018723 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25871146" @default.
- W2328018723 hasPublicationYear "2015" @default.
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