[Effectivity of murein preparations in the phage inhibition test--effect of Ca++ions and EDTA].
1978
: The inactivating efficacy for the typing phages 54, 83A, and 187 of the peptidoglycan of Staphylococcus aureus is decreased by increasing the Ca++-content of the medium; the irreversible inhibition of phage 187 becomes reversible. The percentage of its inhibition is proportional to the Ca++-content of the medium. Minute amounts of phage 187 bound irreversibly under Ca++-deprivation can be loosened by addition of Ca++-ions. Addition of EDTA up to the equivalence concentration of Ca++ present in the medium has no influence. Addition of EDTA up to the tenfold equivalence causes a significant increase of the inactivating efficacy of the peptidoglycan.
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