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(a) Center frequencies of the carbonyl stretching vibrations of methyl acetate (MA) (circles) and methyl propionate (MP) (squares) versus the calculated local electric field for different solvents. The solid lines are the best fits of these data to a linear equation. (b) Schematic representation of how the ester C=O stretching vibration can be used to probe the local electrostatic environments of peptide fibrils. Figure adapted with permission from Pazos et al. (126).
