Micromechanics of Sea Urchin Spines
نویسندگان
چکیده
منابع مشابه
Micromechanics of Sea Urchin Spines
The endoskeletal structure of the Sea Urchin, Centrostephanus rodgersii, has numerous long spines whose known functions include locomotion, sensing, and protection against predators. These spines have a remarkable internal microstructure and are made of single-crystal calcite. A finite-element model of the spine's unique porous structure, based on micro-computed tomography (microCT) and incorpo...
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The purpose of this research is to study the porous microstructure and the micromechanics of the exoskeletal armor of the helmet urchin, Colobocentrotus atratus. Its unusual reduction in spines forms a smooth tiling of millimeter-sized, flattened polygonal protective aboral spines. Each aboral spine articulates with the underlying test via a ball-and-socket joint and the microstructure of each ...
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Sea urchin spines are porous, single crystal Mg-rich calcite [(Mg,Ca)(CO3)] with a three dimensional meshwork architecture. The crystallographic orientation of large (∼10 cm in length) spines from Heterocentrotus trigonarius was determined using the X-ray back-reflection Laue technique; the long axis of all spines is parallel to the 〈00·1〉 direction of calcite. The internal structure was studie...
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The camarodont echinoderms have five distinct mineralized skeletal elements: embryonic spicules, mature test, spines, lantern stereom and teeth. The spicules are transient structural elements whereas the spines, and test plates are permanent. The teeth grow continuously. The mineral is a high magnesium calcite, but the magnesium content is different in each type of skeletal element, varying fro...
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Injury from sea urchin spines is not rare, especially during summer holidays in the sea side. Failure to remove these spines or inability to remove them completely can lead to long-term squeal of pain and impaired function. Treatment methods include alternative medicine, LASER and surgery. We describe the surgical removal of 102 sea urchin spines from the foot of a 36-year-old man. The wounds h...
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ژورنال
عنوان ژورنال: PLoS ONE
سال: 2012
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0044140