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Energy-dispersive diffraction tomography of shark vertebral centra

Published online by Cambridge University Press:  16 September 2024

Jun-Sang Park
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Lemont, IL, USA
Ryan M. Horn
Affiliation:
Department of Aerospace Engineering, Purdue University, West Lafayette, IN, USA
Haiyan Chen
Affiliation:
Mineral Physics Institute, Stony Brook University, Stony Brook, NY, USA
Kelsey C. James
Affiliation:
SW Fisheries Science Center, National Marine Fisheries Service, NOAA, La Jolla, CA, USA
Michelle S. Passerotti
Affiliation:
NE Fisheries Science Center, National Marine Fisheries Service, NOAA, Narragansett, RI, USA
Lisa J. Natanson
Affiliation:
NE Fisheries Science Center, National Marine Fisheries Service, NOAA, Narragansett, RI, USA
Stuart R. Stock*
Affiliation:
Department of Cell and Developmental Biology, Feinberg School of Medicine, and Simpson-Querrey Inst., Northwestern Univ., Chicago, IL, USA
*
a)Author to whom correspondence should be addressed. Electronic mail: s-stock@northwestern.edu
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Abstract

Shark vertebrae and their centra (vertebral bodies) are high-performance structures able to survive millions of cycles of high amplitude strain despite lacking a repair mechanism for accumulating damage. Shark centra consist of mineralized cartilage, a biocomposite of bioapatite (bAp), and collagen, and the nanocrystalline bAp's contribution to functionality remains largely uninvestigated. Using the multiple detector energy-dispersive diffraction (EDD) system at 6-BM-B, the Advanced Photon Source, and 3D tomographic sampling, the 3D functionality of entire centra were probed. Immersion in ethanol vs phosphate-buffered saline produces only small changes in bAp d-spacing within a great hammerhead centrum. EDD mapping under in situ loading was performed an entire blue shark centrum, and 3D maps of bAp strain showed the two structural zones of the centrum, the corpus calcareum and intermedialia, contained opposite-signed strains approaching 0.5%, and application of ~8% nominal strain did not alter these strain magnitudes and their spatial distribution.

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Type
Proceedings Paper
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of International Centre for Diffraction Data

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