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Growth of Porphyromonas gingivalis, Treponema denticola, T. pectinovorum, T. socranskii, and T. vincentii in a chemically defined medium.

Department of Oral Microbiology and General Immunology, Dental Institute of the University of Zürich, Switzerland.

ABSTRACT

A chemically defined medium, OMIZ (Oral Microbiology and Immunology, Zürich)-W1 was developed. Medium OMIZ-W1 supports the long-term proliferation of a wide range of oral anaerobes, including representative strains of four Treponema species and Porphyromonas gingivalis. High concentrations of ascorbic acid and ammonium ions proved to be important for the growth of these organisms. T. denticola CD-1 grew in the absence of polyamines and long-chain fatty acids, T. pectinovorum and T. socranskii required polyamines, whereas T. vincentii depended on both polyamines and lecithin for growth. Specific requirements for purines and/or pyrimidines were detected, and these requirements could be used to distinguish Haemophilus-Actinobacillus group organisms. Some strains of P. gingivalis grew without vitamin K, while others were not satisfied by menadione but required its precursor 1,4-dihydroxy-2-naphthoic acid. Protoporphyrin IX or hemin equally satisfied the porphyrin requirements of P. gingivalis and Bacteroides forsythus, whereas ferrous sulfate was more efficiently used as a source of iron than was hemin. The cellular cohesiveness of P. gingivalis increased with high concentrations of hemin in the growth medium. Prevotella intermedia, B. forsythus, and several strains of P. gingivalis were more fastidious and required a protein or serum supplement to grow in medium OMIZ-W1.

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