Sefi Raz
Weizmann Institute of Science
11 Papers
1.1K Citations
Sefi Raz is an academic researcher from Weizmann Institute of Science. The author has contributed to research in topics: Amorphous calcium carbonate & Calcium carbonate. The author has an hindex of 10, co-authored 11 publications. Previous affiliations of Sefi Raz include University of Burgundy.
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Papers
Taking Advantage of Disorder: Amorphous Calcium Carbonate and Its Roles in Biomineralization
TL;DR: Amorphous calcium carbonate (ACC) in its pure form is highly unstable, yet some organisms produce stable ACC, and cases are known in which ACC functions as a transient precursor of more stable crystalline aragonite or calcite.
1.1K
Biologically formed amorphous calcium carbonate.
TL;DR: It is suspected that amorphous calcium carbonate is far more widely distributed than is presently known, and a comparison of EXAFS spectra shows that different biogenic ACC phases have different short-range order structures.
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Structural Differences Between Biogenic Amorphous Calcium Carbonate Phases Using X-ray Absorption Spectroscopy**
TL;DR: In this article, the authors compare the organization of the first coordination shells around the calcium ion in biogenic ACC phases from three different sources, and show that although the three biogenic samples have the same chemical composition, which is referred to collectively under the name “amorphous calcium carbonate”, they are structurally different from one another.
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Stable amorphous calcium carbonate is the main component of the calcium storage structures of the crustacean Orchestia cavimana.
TL;DR: It is suggested that the use of amorphous calcium carbonate might be advantageous for these storage structures, which function as reservoirs of ions during the animal molting period, and its high solubility is beneficial for temporary storage of calciumcarbonate ions that are subsequently dissolved and used elsewhere.
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