Composite material in the sea urchin Cidaris rugosa: Ordered and disordered micrometre-scale bicontinuous geometries
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Composite material in the sea urchin Cidaris rugosa : Ordered and disordered micrometre-scale bicontinuous geometries. / Jessop, Anna Lee; Millsteed, Allan J.; Kirkensgaard, Jacob J.K.; Shaw, Jeremy; Clode, Peta L.; Schröder-Turk, Gerd E.
I: Journal of the Royal Society Interface, Bind 21, Nr. 212, 20230597, 2024.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Composite material in the sea urchin Cidaris rugosa
T2 - Ordered and disordered micrometre-scale bicontinuous geometries
AU - Jessop, Anna Lee
AU - Millsteed, Allan J.
AU - Kirkensgaard, Jacob J.K.
AU - Shaw, Jeremy
AU - Clode, Peta L.
AU - Schröder-Turk, Gerd E.
N1 - Publisher Copyright: © 2024 The Authors.
PY - 2024
Y1 - 2024
N2 - The sponge-like biomineralized calcite materials found in echinoderm skeletons are of interest in terms of both structure formation and biological function. Despite their crystalline atomic structure, they exhibit curved interfaces that have been related to known triply periodic minimal surfaces. Here, we investigate the endoskeleton of the sea urchin Cidaris rugosa that has long been known to form a microstructure related to the Primitive surface. Using X-ray tomography, we find that the endoskeleton is organized as a composite material consisting of domains of bicontinuous microstructures with different structural properties. We describe, for the first time, the co-occurrence of ordered single Primitive and single Diamond structures and of a disordered structure within a single skeletal plate. We show that these structures can be distinguished by structural properties including solid volume fraction, trabeculae width and, to a lesser extent, interface area and mean curvature. In doing so, we present a robust method that extracts interface areas and curvature integrals from voxelized datasets using the Steiner polynomial for parallel body volumes. We discuss these very large-scale bicontinuous structures in the context of their function, formation and evolution.
AB - The sponge-like biomineralized calcite materials found in echinoderm skeletons are of interest in terms of both structure formation and biological function. Despite their crystalline atomic structure, they exhibit curved interfaces that have been related to known triply periodic minimal surfaces. Here, we investigate the endoskeleton of the sea urchin Cidaris rugosa that has long been known to form a microstructure related to the Primitive surface. Using X-ray tomography, we find that the endoskeleton is organized as a composite material consisting of domains of bicontinuous microstructures with different structural properties. We describe, for the first time, the co-occurrence of ordered single Primitive and single Diamond structures and of a disordered structure within a single skeletal plate. We show that these structures can be distinguished by structural properties including solid volume fraction, trabeculae width and, to a lesser extent, interface area and mean curvature. In doing so, we present a robust method that extracts interface areas and curvature integrals from voxelized datasets using the Steiner polynomial for parallel body volumes. We discuss these very large-scale bicontinuous structures in the context of their function, formation and evolution.
KW - biomineralization
KW - calcite
KW - calcium carbonate
KW - curvature
KW - diamond
U2 - 10.1098/rsif.2023.0597
DO - 10.1098/rsif.2023.0597
M3 - Journal article
C2 - 38471532
AN - SCOPUS:85187707597
VL - 21
JO - Journal of the Royal Society Interface
JF - Journal of the Royal Society Interface
SN - 2042-8898
IS - 212
M1 - 20230597
ER -
ID: 387735008