Glass transitions and folding transitions in complex systems

We first consider the phenomenological relation between glass transitions in normal liquids and glass transitions in protein-like complex systems, taking into account the mesoscopic nature of proteins. We then show the phenomenological relation between the folding transition in proteins and the strong-to-fragile liquid transition in liquid systems with cooperative excitations. This process is presented alternatively as an extreme case in the hierarchy of excitation possibilities in complex liquids with bimodal densities of states.