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RESEARCH PRODUCT
Structural and functional characterization of enamel pigmentation in shrews.
Thomas TütkenMaria Jazmin DuarteMaitena DumontAleksander KostkaSergiy Borodinsubject
Blarina brevicaudaMineralogychemistry.chemical_compoundstomatognathic systemMicroscopy Electron TransmissionX-Ray DiffractionStructural BiologyHardnessbiology.animalElastic ModulusmedicineAnimalsDental EnamelMagnetiteEnamel paintbiologyChemistryPigmentationPhotoelectron SpectroscopyShrewsShrewNanoindentationTooth enamelbiology.organism_classificationFerrosoferric Oxidestomatognathic diseasesmedicine.anatomical_structureTransmission electron microscopyvisual_artIron contentDentinvisual_art.visual_art_mediumBiophysicsdescription
Pigmented tooth enamel occurs in several vertebrate clades, ranging from mammals to fish. Although an iron compound is associated with this orange to red colored pigmentation, its chemical and structural organization within the enamel is unknown. To determine the nature of the iron compound, we investigated heavily pigmented teeth of the northern short-tailed shrew Blarina brevicauda using combined characterization techniques such as scanning and transmission electron microscopy and synchrotron X-ray diffraction. We found that the pigmentation of the enamel with an iron content of around 8wt% results from a close to amorphous magnetite phase deposited around the nm-sized enamel crystals. Furthermore, the influence of the pigmentation on the enamel hardness was determined by nanoindentation measurements. Finally, the biomechanical function and biological context are discussed in light of the obtained results.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-12-16 | Journal of structural biology |