Figure 7.

Ramachandran histograms taken over the 120 residues nearest to the tip during the atomistic simulations, at 12 ns (equals 12 Å) before the contact minimum, at the minimum, and 10 Å past the minimum. The diagonal line indicates Φ = −Ψ: structures lying on this line have no strand twist. Structures closer to the upper‐left corner are more extended. Before being flattened to the surface, the thin (fibril‐like, on the left) structure has extended backbone conformation in some residues. At contact it takes on a more pleated structure with less twist. Under extreme indentation the two samples have similar compact and non‐twisted conformations. The thick (nanocrystal‐like, on the right) structure begins as compact and remains so, changing much less under indentation.