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Calcifiability comparison among selected microorganisms

J Ennever, J L Streckfuss, M C Goldschmidt

Journal of Dental Research

|October 1, 1981

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Microbial calcification, the formation of apatite by bacteria, is limited to specific species. Testing requires metastable calcium phosphate solutions, not just culture media, to accurately assess bacterial calcification potential.

Area of Science:

Microbiology
Biomineralization
Environmental Science

Background:

Microbial calcification is a biomineralization process with implications in geology and medicine.
Previous studies suggest calcification is a trait limited to certain microorganisms.

Purpose of the Study:

To investigate the calcification potential of various bacterial strains.
To evaluate the efficacy of different assay methods for determining microbial calcifiability.

Main Methods:

Seven ATCC bacterial strains were tested for apatite formation.
Incubation occurred in a chemically-defined calcification-supporting medium and a metastable calcium phosphate solution.

Main Results:

Escherichia coli calcified in both tested environments.

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Staphylococcus aureus calcified only in the metastable solution.

Five other strains showed no calcification in either environment.

Conclusions:

Microbial calcification is indeed restricted to specific microorganisms.
Assessing calcifiability solely in culture media is insufficient.
Metastable calcium phosphate solutions are crucial for accurate microbial calcifiability assays.