Sea Urchin Spine Calcite Forms via a Transient Amorphous Calcium Carbonate Phase

Author:

Politi Yael12,Arad Talmon12,Klein Eugenia12,Weiner Steve12,Addadi Lia12

Affiliation:

1. Department of Structural Biology, 76100 Rehovot, Israel.

2. Chemical Research Support Unit, Weizmann Institute of Science, 76100 Rehovot, Israel.

Abstract

The skeletons of adult echinoderms comprise large single crystals of calcite with smooth convoluted fenestrated morphologies, raising many questions about how they form. By using water etching, infrared spectroscopy, electron diffraction, and environmental scanning electron microscopy, we show that sea urchin spine regeneration proceeds via the initial deposition of amorphous calcium carbonate. Because most echinoderms produce the same type of skeletal material, they probably all use this same mechanism. Deposition of transient amorphous phases as a strategy for producing single crystals with complex morphology may have interesting implications for the development of sophisticated materials.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference30 articles.

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