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Short-range ice binding and long-range solvent perturbation both have been implicated in the activity of antifreeze proteins and antifreeze glycoproteins. We study these two mechanisms for activity of winter flounder antifreeze peptide. Four mutants are characterized by freezing point hysteresis (activity), circular dichroism (secondary structure), Förster resonance energy transfer (end-to-end rigidity),...
We propose three reasons for the simplicity of vibrationally resolved electronic spectra of complex chain molecules: vibr(onic) state localization, insensitivity of chromophores to conformational changes outside the chromophore, and an ‘energy gap law’ for low-lying conformers. Here we use alkanals as simple models of chain molecules to study the third proposal. A disconnectivity tree and scaling...
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