Anisotropic lattice distortions in biogenic calcite induced by intra-crystalline organic molecules.

6533b7ddfe1ef96bd1273de4

RESEARCH PRODUCT

Anisotropic lattice distortions in biogenic calcite induced by intra-crystalline organic molecules.

Moshe Kapon Andrew N. Fitch Emil Zolotoyabko Frédéric Marin Noam Adir Boaz Pokroy

subject

Diffraction Biomineralization MESH : Calcium Carbonate MESH: Bivalvia 02 engineering and technology Crystallography X-Ray 01 natural sciences law.invention chemistry.chemical_compound Structural Biology law MESH : Bivalvia Ostrea MESH : Anisotropy MESH: Animals Organic Chemicals Crystallization Anisotropy MESH: Crystallization Calcite MESH: Ostrea Synchrotron radiation Calcite Crystal growth and nucleation MESH : Organic Chemicals 021001 nanoscience & nanotechnology MESH: Calcium Carbonate MESH : Crystallization X-ray crystallography Crystallization 0210 nano-technology Materials science MESH : Crassostrea 010402 general chemistry Calcium Carbonate Animals Crassostrea Intra-crystalline organic molecules [SDV.IB.BIO]Life Sciences [q-bio]/Bioengineering/Biomaterials Biogenic crystals MESH : Ostrea MESH: Organic Chemicals MESH: Crystallography X-Ray [ SDV.IB.BIO ] Life Sciences [q-bio]/Bioengineering/Biomaterials Bivalvia 0104 chemical sciences X-ray diffraction Crystallography MESH: Crassostrea chemistry MESH: Anisotropy Anisotropy MESH : Animals MESH : Crystallography X-Ray Single crystal Powder diffraction Biomineralization

description

9 pages; International audience; We have performed precise structural measurements on five different calcitic seashells by high-resolution X-ray powder diffraction on a synchrotron beam line and by laboratory single crystal X-ray diffraction. The unit cell parameters a and c of biogenic calcite were found to be systematically larger than those measured in the non-biogenic calcite. The maximum lattice distortion (about 2.10(-3)) was detected along the c-axis. Under heat treatment above 200 degrees C, a pronounced lattice relaxation was observed, which allowed us to conclude that anisotropic lattice swelling in biogenic calcite is induced by organic macromolecules incorporated within the single crystal calcitic prisms during biomineralization. This conclusion is supported by the results of crystallization experiments in the presence of specific protein extracted from one of the shells.

year	journal	country	edition	language
2006-07-01

https://hal.archives-ouvertes.fr/hal-00198280