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Updated: Jun 11, 2025
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Characterization Of Multi-layered Fish Scales Atractosteus spatula Using Nanoindentation, X-ray CT, FTIR, and SEM
Published on: July 10, 2014
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Revealing chemistry-structure-function relationships in shark vertebrae across length scales
Dawn Raja Somu1, Malena Fuentes1, Lihua Lou2
1Department of Chemistry and Biochemistry, Department of Ocean and Mechanical Engineering, Florida Atlantic University, Boca Raton, FL 33431, USA.
Acta Biomaterialia
|September 30, 2024
Summary
Shark vertebrae showcase complex microstructures linking composition to biomechanics. Mineralization patterns and collagen arrangement influence mechanical properties, crucial for fish speed and biomimetic material design.
Area of Science:
- Biomaterials Science
- Comparative Biomechanics
- Materials Science
Background:
- Shark cartilage is a composite of collagen, proteoglycans, and bioapatite.
- Vertebral structure varies between shark species, influencing biomechanical function.
- Understanding these variations can inform biomimetic material development.
Purpose of the Study:
- To investigate the relationship between microstructure, chemical composition, and biomechanical properties of shark vertebral cartilage.
- To compare these properties in Blacktip (Carcharhiniformes) and Shortfin Mako (Lamniformes) sharks.
- To elucidate the role of structural components in the mechanical performance of shark vertebrae.
Main Methods:
- Polarized Light Microscopy (PLM) for structural analysis.
- Atomic Force Microscopy (AFM) for microstructural imaging.
- Confocal Raman Microspectroscopy for chemical composition analysis.
- Nanoindentation for measuring nanomechanical properties.
Main Results:
- Observed distinct mineral organization and collagen fiber arrangements in different vertebral regions.
- Identified a chain-like network in less mineralized areas and ridged morphology in highly calcified regions.
- Demonstrated that glucosaminoglycans (GAGs) modulate bioapatite mineralization.
- Found that localized mineral content and arrangement significantly impact nanomechanical properties, with mineralized regions showing moduli 10x higher than bulk.
Conclusions:
- Shark vertebral cartilage exhibits region-specific microstructural and compositional variations that dictate its mechanical properties.
- These intricate structures contribute to the flexibility and strength enabling high-speed locomotion in sharks.
- Findings provide a foundation for designing advanced biomimetic composite materials with tailored stiffness gradients.
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