Mollusc larval shell formation: amorphous calcium carbonate is a precursor phase for aragonite

Wiley - Tập 293 Số 5 - Trang 478-491 - 2002
Ingrid M. Weiss1, Noreen Tuross2, Lia Addadi1, Steve Weiner1
1Department of Structural Biology, Weizmann Institute of Science, 76100, Rehovot, Israel
2Smithsonian Center for Materials Research and Education, Suitland, Maryland 20746

Tóm tắt

Abstract

The larval shells of the marine bivalves Mercenaria mercenaria and Crassostrea gigas are investigated by polarized light microscopy, infrared spectroscopy, Raman imaging spectroscopy, and scanning electron microscopy. Both species contain similar shell ultrastructures. We show that larval shells contain amorphous calcium carbonate (ACC), in addition to aragonite. The aragonite is much less crystalline than nonbiogenic aragonite. We further show that the initially deposited mineral phase is predominantly ACC that subsequently partially transforms into aragonite. The postset juvenile shell, as well as the adult shell of Mercenaria also contains aragonite that is less crystalline than nonbiogenic aragonite. We conclude that ACC fulfills an important function in mollusc larval shell formation. It is conceivable that ACC may also be involved in adult shell formation. J. Exp. Zool. 293:478–491, 2002. © 2002 Wiley‐Liss, Inc.

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Wiley

Tập 293 Số 5

478-491

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