1 / 2

How does crystallinity propagate through the amorphous sea urchin larval spicule?

Amorphous precursors explain unusual morphology of biominerals amorphous precursors have now been observed in tooth enamel, in zebra fish fin bones, in mollusk shells, in the chiton teeth, shark otoliths, sea urchin spines, sea urchin spicules, etc.

buffy
Download Presentation

How does crystallinity propagate through the amorphous sea urchin larval spicule?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Amorphous precursors explain unusual morphology of biominerals amorphous precursors have now been observed in tooth enamel, in zebra fish fin bones, in mollusk shells, in the chiton teeth, shark otoliths, sea urchin spines, sea urchin spicules, etc. How does crystallinity propagate through the amorphous sea urchin larval spicule? sea urchin larval spicules (above) diffract like single crystals of calcite, and they are 99.9w% calcite, yet their morphology is very different from calcite rhombohedra.

  2. Crystallinity propagates through ACC via secondary nucleation the crystalline pattern follows a random walk no isolated crystal units  fractal network percolation PEEM-3 data 48-hr spicules, 20-nm pixels each pixel was assigned to either anhydrous ACC or calcite, using singular value decomposition (SVD) Yael Politi, Rebecca A. Metzler, Mike Abrecht, Benjamin Gilbert, Fred Wilt, Irit Sagi, Lia Addadi, Steve Weiner, and P.U.P.A. Gilbert. Mechanism of transformation of amorphous calcium carbonate into calcite in the sea urchin larval spicule. Procs. Natl. Acad. Sci. USA 105, 17362-17366, 2008.

More Related