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Coccolith crystals: Pure calcite or organic-mineral composite structures?

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  • 1Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60201, United States of America.

Acta Biomaterialia
|February 25, 2021
PubMed
Summary

The formation of coccoliths, intricate calcite plates made by algae, remains unclear. This review examines evidence for and against an organic-containing nanostructure within these biominerals, crucial for understanding biomineralization.

Keywords:
BiomineralizationCoccolithophoresCrystallizationOrganic-inorganic interactionsPolysaccharides

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Area of Science:

  • Biomineralization research
  • Marine biology
  • Algal cell biology

Background:

  • Coccoliths are sophisticated calcite biominerals produced by coccolithophores, influencing biogeochemical cycles.
  • The precise localization of organic material within coccoliths is a key unsolved question in their formation mechanism.
  • Understanding coccolith crystallization is vital for biomineralization research and cell biology.

Purpose of the Study:

  • To review existing evidence regarding the presence or absence of a nanostructure within coccolith calcite crystals.
  • To clarify whether coccoliths contain organic material, which impacts proposed formation mechanisms.
  • To identify future research directions for resolving the coccolith formation puzzle.

Main Methods:

  • Review of current scientific literature and data.
  • Analysis of evidence from various imaging techniques (SEM, TEM, AFM).
  • Consideration of results from specialized analyses like SXPD (synchrotron X-ray powder diffraction).

Main Results:

  • Conflicting evidence exists: SXPD suggests a nanostructure, while SEM, TEM, and AFM imaging do not clearly support it.
  • The presence or absence of organic material within coccolith crystals is still debated.
  • The traditional understanding of coccolith formation may need revision.

Conclusions:

  • The internal nanostructure of coccoliths remains an open question, hindering a complete understanding of their formation.
  • Further research is needed to reconcile conflicting data and elucidate the biomineralization process.
  • Resolving this puzzle will advance both coccolithophore biology and general biomineralization science.