Deutsch
 
Hilfe Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT

Freigegeben

Zeitschriftenartikel

Materials nanoarchitecturing via cation-mediated protein assembly: Making limpet teeth without mineral.

MPG-Autoren
/persons/resource/persons206062

Godec,  A.
Research Group of Mathematical Biophysics, MPI for Biophysical Chemistry, Max Planck Society;

Externe Ressourcen
Es sind keine externen Ressourcen hinterlegt
Volltexte (beschränkter Zugriff)
Für Ihren IP-Bereich sind aktuell keine Volltexte freigegeben.
Volltexte (frei zugänglich)

2451363.pdf
(Verlagsversion), 3MB

Ergänzendes Material (frei zugänglich)

2451363_Suppl.pdf
(Ergänzendes Material), 2MB

Zitation

Ukmar-Godec, T., Bertinetti, L., Dunlop, J. W. C., Godec, A., Grabiger, M. A., Masic, A., et al. (2017). Materials nanoarchitecturing via cation-mediated protein assembly: Making limpet teeth without mineral. Advanced Materials, 29(27): 1701171. doi:10.1002/adma.201701171.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002D-5F20-6
Zusammenfassung
Teeth are designed to deliver high forces while withstanding the generated stresses. Aside from isolated mineral-free exception (e.g., marine polychaetes and squids), minerals are thought to be indispensable for tooth-hardening and durability. Here, the unmineralized teeth of the giant keyhole limpet (Megathura crenulata) are shown to attain a stiffness, which is twofold higher than any known organic biogenic structures. In these teeth, protein and chitin fibers establish a stiff compact outer shell enclosing a less compact core. The stiffness and its gradients emerge from a concerted interaction across multiple length-scales: packing of hydrophobic proteins and folding into secondary structures mediated by Ca2+ and Mg2+ together with a strong spatial control in the local fiber orientation. These results integrating nanoindentation, acoustic microscopy, and finite-element modeling for probing the tooth's mechanical properties, spatially resolved small- and wide-angle X-ray scattering for probing the material ordering on the micrometer scale, and energy-dispersive X-ray scattering combined with confocal Raman microscopy to study structural features on the molecular scale, reveal a nanocomposite structure hierarchically assembled to form a versatile damage-tolerant protein-based tooth, with a stiffness similar to mineralized mammalian bone, but without any mineral.