TY  - JOUR
AU  - Raja Somu, Dawn
AU  - Soini, Steven A.
AU  - Briggs, Ani
AU  - Singh, Kritika
AU  - Greving, Imke
AU  - Porter, Marianne
AU  - Passerotti, Michelle
AU  - Merk, Vivian
TI  - A Nanoscale View of the Structure and Deformation Mechanism of Mineralized Shark Vertebral Cartilage
JO  - ACS nano
VL  - 19
IS  - 14
SN  - 1936-0851
CY  - Washington, DC
PB  - Soc.
M1  - PUBDB-2025-02595
SP  - 14410 - 14421
PY  - 2025
N1  - Waiting for fulltext 
AB  - Swimming kinematics and macroscale mechanical testing have shown that the vertebral column of sharks acts as a biological spring, storing and releasing energy during locomotion. Using synchrotron X-ray nanotomography and deep-learning image segmentation, we studied the ultrastructure and deformation mechanism of mineralized shark vertebrae from Carcharhinus limbatus (Blacktip shark). The vertebral centrum con regions: the corpus calcareum, a hypermineralized double cone, and the intermediale, blocks of mineralized cartilage interspersed by unmineralized arches. At the micron scale, mineralized cartilage has previously been described as a 3D network of interconnected mineral plates that vary in thickness and spacing. The corpus calcareum consists of stacked, interconnected, curved mineralized planes permeated by a network of organic occlusions. The mineral network in the intermedialia resembles trabecular bone, including thicker struts in the direction opposite to the predominant biological strain. We characterized collagenous fiber elements winding around lacunar spaces in the intermedialia, and we hypothesize the swirling arrangement and elasticity of the fibers to be distributing stress. With little permanent deformation detected in mineralized structures, it is likely that the soft organic matrix is crucial for absorbing energy through deformation, irreversible damage, and viscoelastic behavior. In the corpus calcareum, cracks typically terminate toward thick struts along the mineral planes, resembling the microscale crack deflection and arrest mechanism found in other staggered biocomposites, such as nacre or bone. Using transmission electron microscopy (TEM), we observed preferentially oriented, needlelike bioapatite crystallites and d-band patterns of collagen type-II fibrils resulting from intrafibrillar mineralization.
LB  - PUB:(DE-HGF)16
C6  - pmid:40191917
DO  - DOI:10.1021/acsnano.5c02004
UR  - https://bib-pubdb1.desy.de/record/634681
ER  -