Figure 7.

Typical structure of native SMTP adsorbed on the siloxide-rich SiO₂ surface (a, b); on the fully hydroxylated hSiO₂ surface (c, d); and on the half-hydroxylated hhSiO₂ surface (e, f). The surface atoms are indicated as yellow (Si) and red (O) CPKs, the peptide is shown as a cartoon, and Arg6 and Arg9 are shown by licorice and annotated. The peptide ends and key distances to the surface are annotated. The distances are shown in Å. Water molecules are shown by the thin CPK model in part a only to keep the pictures clear.