Abstract
Streptococcus mitis ATCC 903 and Streptococcus sanguis 804 could utilize large peptides present in proteose peptone as their sole source of nitrogen but grew poorly in amino acid medium. By contrast, Streptococcus mutans BHT and S. mutans IB grew in amino acid medium but could not utilize large peptides. Streptococcus sp. strain Bravato had requirements for both peptides and amino acids. Peptide size did not seem important for the utilization of peptides by S. mitis except that dipeptides were not utilized. Large peptides were essential for depressed hyaluronidase synthesis in nongrowing S. mitis. Intracellular aminopeptidase activities were high in S. mitis ATCC 903 and Streptococcus sp. strain Bravato, intermediate in S. sanguis 804, and low in S. mutans BHT and S. mutans IB.
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Selected References
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