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. 1981 Jun;146(3):1075–1082. doi: 10.1128/jb.146.3.1075-1082.1981

Nutritionally variant streptococci from patients with endocarditis: growth parameters in a semisynthetic medium and demonstration of a chromophore.

A Bouvet, I van de Rijn, M McCarty
PMCID: PMC216963  PMID: 7240084

Abstract

Nutritionally variant streptococci have been characterized in the past by their growth as satellite colonies and by their nutrient requirements of cysteine or vitamin B6 for growth in complex media. To further understand the growth characteristics of these strains, we studied fresh isolates from patients with endocarditis by using chemically defined medium enriched with 2% Todd-Hewitt dialysate. Under anaerobic conditions, growth yields of the strains in this medium were comparable to those obtained from a complex medium supplemented with vitamin B6, whereas under aerobic conditions, most of the strains had higher growth yields in the semisynthetic medium. Furthermore, the requirement for cysteine and vitamin B6 in the semisynthetic medium was no greater than that of other Streptococcus species. Electron microscopic studies demonstrated normal cell wall structures in organisms grown in the semisynthetic medium as compared with abnormal and irregular cell wall thickening in organisms grown in supplemented complex medium. Finally, these strains appeared to contain a common component when grown in the semisynthetic medium as demonstrated by the appearance of a chromophore after boiling the bacteria at pH 2. Therefore, the demonstration of a medium which permits adequate growth with a normal ultrastructure of nutritionally variant streptococci will permit the further study of this group of important streptococci.

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Selected References

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