Fig. 2: Polarized vibrational spectra.
From: Protein secondary structure in spider silk nanofibrils
p-FTIR (a, b) and p-Raman (c, d) spectra measured experimentally (Exp.) of single Loxosceles spider silk ribbons (thick gray lines) with polarizations in X and Z directions, in the plane of the ribbon. Dashed, black line: multi-peak fit; all constituting sub-peaks shown in colors. Blue, purple, red, and yellow peaks are assigned to β-sheet, β-turn, helical, and random coil peaks, repsectively. Green peaks represent amino acid residues with aromatic side-chain groups. Gray peaks are unassigned. The colored horizontal bars represent known peaks from the literature, with colors matching the secondary structure assignment.
