Figure 11.
(a) Free energy of folding ΔAf as a function of temperature for all four systems. The folding temperature in each case is the temperature at which ΔAf = 0. For the weakly coupled nanotube (λ = 0.5), the folding temperature increases over the isolated protein, i.e., the folded state is stabilized. For larger values of the coupling parameter, the folding temperature decreases. (b) Specific heat as a function of temperature for the isolated protein and the three systems with carbon nanotubes. The maximum of the specific heat for each system identifies the transition temperature for the coupled folding and binding of the protein. For the isolated protein, this is a second, equivalent definition of the folding temperature.