Self‐Sharpening Mechanism of the Sea Urchin Tooth

@article{Killian2011SelfSharpeningMO,
  title={Self‐Sharpening Mechanism of the Sea Urchin Tooth},
  author={Christopher E. Killian and Rebecca A. Metzler and Yutao Gong and Tyler H. Churchill and Ian C. Olson and Vasily Trubetskoy and Matthew B. Christensen and John H. Fournelle and Francesco De Carlo and Sidney R. Cohen and Julia Mahamid and Andreas Scholl and Anthony T. Young and Andrew Doran and Fred H. Wilt and Susan N. Coppersmith and Pupa U.P.A. Gilbert},
  journal={Advanced Functional Materials},
  year={2011},
  volume={21}
}
The sea urchin tooth is a mosaic of calcite crystals shaped precisely into plates and fibers, cemented together by a robust calcitic polycrystalline matrix. The tooth is formed continuously at one end, while it grinds and wears at the opposite end, the sharp tip. Remarkably, these teeth enable the sea urchin to scrape and bore holes into rock, yet the teeth remain sharp rather than dull with use. Here we describe the detailed structure of the tooth of the California purple sea urchin… 

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References

SHOWING 1-10 OF 31 REFERENCES

Mechanism of calcite co-orientation in the sea urchin tooth.

Differences in calcite c-axis orientations in the tooth of the purple sea urchin are shown and it is demonstrated that co-orientation of the nanoparticles in the polycrystalline matrix occurs via solid-state secondary nucleation, propagating out from the previously formed fibers and plates, into the amorphous precursor nanoparticles.

The grinding tip of the sea urchin tooth exhibits exquisite control over calcite crystal orientation and Mg distribution

This work uses 3 complementary high-resolution tools to probe aspects of the structure of the grinding tip of the sea urchin tooth: X-ray photoelectron emission spectromicroscopy, x-ray microdiffraction, and NanoSIMS.

Mineral Deposition and Crystal Growth in the Continuously Forming Teeth of Sea Urchins

The early stages of formation of the crystalline elements in the continuously forming sea urchin teeth were studied using polarized light microscopy, SEM, TEM and calcite overgrowth. Transient

Interactions of sea-urchin skeleton macromolecules with growing calcite crystals— a study of intracrystalline proteins

The exoskeletons of sea urchins are composed of magnesiumbearing calcite. Individual test plates and spines behave as single crystals in polarized light or when examined by X-ray diffraction1–3. They

Ultrastructure and growth of the sea urchin tooth

  • E. Kniprath
  • Chemistry, Medicine
    Calcified Tissue Research
  • 2005
Following the origin of a syncytium in the plumula, a new tooth element sheath originates in the form of a vesicle, which develops a unified crystallization cavity in the shape of the future tooth element during the early growth of the sheath.

Intercalation of sea urchin proteins in calcite: study of a crystalline composite material.

By means of x-ray diffraction with synchrotron radiation, it is shown that the presence of the protein in synthetic calcite only slightly decreases the coherence length but significantly increases the angular spread of perfect domains of the crystals.

Fracture Toughness and Interfacial Design of a Biological Fiber‐Matrix Ceramic Composite in Sea Urchin Teeth

The working zone of a sea urchin tooth is a ceramic-fiber-reinforced ceramic-matrix composite. It is composed of reinforcing calcitic fibers, a matrix of high-magnesium-containing calcite crystals,

Zur funktionellen anatomie der seeigelzähne (Echinodermata, Echinoidea)

SummaryThe teeth of sea urchins are built of magnesiumrich calcite. Sea urchin teeth are considerably stronger than compact calcite. They have no homogeneous crystal lattice with preferred cleavage