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J Dent Res 45(3): 877-881, 1966
© 1966 International and American Associations for Dental Research
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Lysozyme Insensitivity of Bacteria Indigenous to the Oral Cavity of Man

R. J. GIBBONS 1, J. D. de STOPPELAAR 1, and L. HARDEN 1

1 Forsyth Dental Center and Harvard School of Dental Medicine, Boston, Massachusetts

Bacteria indigenous to the oral cavity of man have been surveyed for susceptibility to the lytic action of lysozyme, using three technics. None of 112 pure cultures, representing 13 groups of bacteria, was found to be lysed by lysozyme at concentrations of 5, 50, or 500 µg. per milliliter when assayed turbidimetrically. In addition, the most numerous bacteria cultivable from samples of gingival debris, dental plaque, and saliva were found to grow in the presence of 0.5, 5, or 50 µg. of lysozyme per milliliter. Finally, when samples of gingival debris were incubated with 50 µg. of lysozyme per milliliter, no marked bacterial lysis was evident, since a release of soluble protein was not detected. These data suggested that lysozyme per se had little effect on bacteria indigenous to the oral cavity of man.

Submitted on May 10, 1965




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