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Focus on the formation of bones, teeth and shells
Date:5/14/2009

Researchers at Eindhoven University of Technology for the first time have shown the earliest stages in biomineralization, the process that leads to the formation of bones, teeth and sea shells.

They used the world's most modern electron microscope to capture a three-dimensional image of the nanoparticles that form the basis for this process. The results provide a greater understanding of the formation of bones, teeth and shells. This creates a prospect of better materials and processes for industry, based on nature. The findings featured as the cover story for the scientific journal Science on Friday 13 March.

The researchers, led by Vidi laureate Dr Nico Sommerdijk, managed to image small clusters, with a diameter of 0.7 nanometers, in a solution of calcium carbonate, (the basic material of shells, for example). They were the first to show that these clusters, containing no more than about ten ions, were the start of the growth process from which the crystalline biomineral is ultimately formed.

To do this, they used the extremely high resolution of a special electron microscope, the FEI Company's cryoTitan. The equipment was acquired with the assistance of a NWO Large Investment grant for the TU/e and Maastricht University. It allowed them to be the first in their field to see how the clusters nucleated into larger, unstructured nanoparticles with an average diameter of about 30 nanometers.

Three-dimensional imaging revealed that an organic surface introduced by the researchers allowed these nanoparticles to grow into larger particles, in which crystalline areas could be formed later, through structuring of the ions. The TU/e researchers demonstrated a second role for the organic layer: it directed quite precisely the direction in which the mineral could grow into a mature biomineral. In the near future they hope to show that the mechanism they have discovered also applies to the formation of other crystalline biomin
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Contact: Nico Sommerdijk
N.Sommerdijk@tue.nl
31-040-247-5870
Netherlands Organization for Scientific Research
Source:Eurekalert

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