Project Leaders

Dr.  Mason  Dean
Dr. Mason Dean
Group Leader
Phone:+49 331 567-9452Fax:+49 331 567-9402
Ronald  Seidel
Ronald Seidel
PhD Student
Phone:9237Fax:9402

Max Planck Institute of Colloids and Interfaces

Additional Collaborators

Michael Blumer, Medizinische Universität, Innsbruck

Sidney Omelon, University of Ottawa, Canada

Andreas Roschger & Paul Roschger, Ludwig Boltzmann Institute of Osteology, Vienna

Paul Zaslansky, Julius Wolff Institute, Charité Universitätsmedizin, Berlin

Tesserae ultrastructure and ontogeny

Summary
The tiled outer layer of shark and ray skeletons is a natural composite of mineralized polygonal tiles (tesserae) and collagen fiber bundles, the complex and finescale 3d arrangements of which have made characterization difficult. Using high-resolution materials characterization techniques (e.g. qBEI, µCT, SRµCT) we show that tesserae exhibit great heterogeneity in mineral density, with distinct hypermineralized structural features appearing to function in load bearing, abrasive resistance and energy dissipation (e.g. at crack tips). We examine the ultrastructure of these mineralized features across ontogeny to understand how they function in skeletal performance, but also how they come to exceed mineral content and tissue stiffness of mammalian bone.

The complex patterns of mineral density variation in tesserae provide clues to growth mechanisms and mechanics. (Backscatter electron image) Zoom Image
The complex patterns of mineral density variation in tesserae provide clues to growth mechanisms and mechanics. (Backscatter electron image) [less]
 
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