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. 1983 Feb;45(2):411–417. doi: 10.1128/aem.45.2.411-417.1983

Effects of Inorganic Particles on Metabolism by a Periphytic Marine Bacterium

Andrew S Gordon 1, Sol M Gerchakov 1, Frank J Millero 1
PMCID: PMC242301  PMID: 16346191

Abstract

Measurements were made of adsorption of a periphytic marine bacterium, glucose, and glutamic acid to inorganic particles in seawater and defined bacterial growth medium. Measurements of the metabolism of bacteria were made in the presence and absence of particles by microcalorimetry and radiorespirometry. It was found that hydroxyapatite adsorbs glutamic acid, but not glucose, from the experimental medium. It was also found that hydroxyapatite adsorbs essentially all of the bacteria from the medium when the bacterial concentration is approximately 6 × 105 bacteria per ml. If the bacterial concentration is approximately 6 × 107, then only a small fraction of cells become attached. It was therefore possible to select bacterial concentrations and organic nutrients so that bacterial attachment, organic nutrient adsorption, or both would occur in different experiments. In this experimental system the metabolism by attached and nonattached bacteria of adsorbing and nonadsorbing organic nutrients was measured. The results show that bacterial activity in this model system was not enhanced by the particles, regardless of whether the bacteria, the organic nutrient, or both were associated with the surface. In fact, the respiratory activity of the attached bacteria was diminished in comparison with that of free bacteria.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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