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Mechanical adaptation of brachiopod shells via hydration-induced structural changes

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Ihli, Johannes 
Schenk, Anna S. 
Rosenfeldt, Sabine 


Abstract: The function-optimized properties of biominerals arise from the hierarchical organization of primary building blocks. Alteration of properties in response to environmental stresses generally involves time-intensive processes of resorption and reprecipitation of mineral in the underlying organic scaffold. Here, we report that the load-bearing shells of the brachiopod Discinisca tenuis are an exception to this process. These shells can dynamically modulate their mechanical properties in response to a change in environment, switching from hard and stiff when dry to malleable when hydrated within minutes. Using ptychographic X-ray tomography, electron microscopy and spectroscopy, we describe their hierarchical structure and composition as a function of hydration to understand the structural motifs that generate this adaptability. Key is a complementary set of structural modifications, starting with the swelling of an organic matrix on the micron level via nanocrystal reorganization and ending in an intercalation process on the molecular level in response to hydration.



Article, /639/301/54, /639/301/54/991, /639/925/930/2735, /123, /147/135, /147/137, /140/131, /145, /128, article

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Nature Communications

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Nature Publishing Group UK
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Swiss National Science Foundation) (179886, 200021)
Deutsche Forschungsgemeinschaft (German Research Foundation) (Collaborative Research Center SFB 840)
NERC Environmental Bioinformatics Centre (NEBC) (NE/P011063/1)
EC | Horizon 2020 Framework Programme (EU Framework Programme for Research and Innovation H2020) (730872 CALIPSOplus)