Control of aragonite or calcite polymorphism by mollusk shell macromolecules

Science

Volumn 271, Issue 5245, 1996, Pages 67-69

  Falini, Giuseppe ^a,b   Albeck, Shira ^a   Weiner, Steve ^a   Addadi, Lia ^a  

^a WEIZMANN INSTITUTE OF SCIENCE   (Israel)

^b UNIVERSITY OF BOLOGNA   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

CALCIUM CARBONATE; CHITIN; FIBROIN;

ARTICLE; CRYSTAL STRUCTURE; CRYSTALLIZATION; MACROMOLECULE; MOLLUSC; PRIORITY JOURNAL;

ARAGONITE; ARAGONITE/CALCITE POLYMORPHISM; BIOMINERALIZATION; CALCITE; CARBONATE MINERALS; CHEMICAL PRECIPITATION; CHITIN; FIBROIN; MOLLUSC; MOLLUSC SHELLS; POLYMORPHISM;

EID: 0029667586     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.271.5245.67     Document Type: Article

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25. 2 solution. The control films were prepared in the same manner without the Chitin.
26. 2 solution. The control films were prepared in the same manner without the Chitin.
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29. 2 solution in a closed desiccator for 2 days All crystallization experiments were repeated four to six times Typically, about 80 to 400 spherulites per square centimeter formed, out of which at least 10 were analyzed individually by FTIR a few hours to a few days after crystallization The spherulites of each given polymorph have a distinctive and homogeneous morphology (Rg. 1)
30. We observed discrete centers from which nucleation occurred from locally supersaturated specific sites. We refer to these crystallization centers as "spherulites" even though their shape is not spherical
31. Additional experiments with silk fibroin and polystyrene substrates resulted only in the formation of rhombohedral calcite crystals and a small number of vaterite crystals.
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35. G.F. thanks A. Ripamonti and M. Gazzano of the Department of Chemistry, University of Bologna, for their valuable advice and support. We thank S. Brande for providing some of the shell material. S W is the incumbent of the I. W. Abel Professorial Chair of Structural Biology, and L.A is the incumbent of the Patrick A Gorrnan Professorial Chair of Biological Ultrastructure, both at the Weizmann Institute of Science. This study was supported by a United States-Israel Binational Science Foundation grant