Exceptional properties of hyper-resistant armor of a hydrothermal vent crab SCIE SCOPUS

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Title
Exceptional properties of hyper-resistant armor of a hydrothermal vent crab
Author(s)
Cho, Boongho; Kim, Dong Sung; Kim, Taewon
KIOST Author(s)
Kim, Dong Sung(김동성)
Alternative Author(s)
김동성
Publication Year
2022-07
Abstract
Animals living in extreme environments, such as hydrothermal vents, would be expected to have evolved protective shells or exoskeletons to maintain homeostasis. The outer part of the exoskeleton of vent crabs (Austinograea sp.) in the Indian Ocean hydrothermal vent was one of the hardest (approximately 7 GPa) biological materials ever reported. To explore the exoskeletal characteristics of vent crabs which enable them to adapt to severe environments, a comparative analysis was conducted with the Asian paddle crab (Charybdis japonica) living in coastal areas. Nanoindentation, thermogravimetric analysis, scanning electron microscopy, energy dispersive x-ray analysis, and Raman spectroscopy were used to analyze the mechanical properties, thermal stability, structure, surface components, and the composition of compounds, respectively. Though both species have four-layered exoskeletons, the outermost layer of the vent crab, a nano-granular structure, was much thicker than that of the coastal crab. The proportions of aluminum and sulfur that constitute the epicuticle of the exoskeleton were higher in the vent crab than in the coastal crab. There was a lack of water or volatile substances, lots of CaCO3, and no carotenoid-based compounds in the exoskeleton of the vent crab. These might have improved the mechanical properties and thermal stability of the hydrothermal species.
ISSN
2045-2322
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/43080
DOI
10.1038/s41598-022-15982-1
Bibliographic Citation
Scientific Reports, v.12, no.1, 2022
Publisher
Nature Publishing Group
Type
Article
Language
English
Document Type
Article
Publisher
Nature Publishing Group
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