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Extracellular nuclease activity in Staphylococcus aureus was enhanced about fourfold by 1% (w/v) NaCl, KCl, CsCl or LiCl. The pH and concentration of Ca2+ for optimum activity varied with the NaCl concentration; with an increased NaCl concentration, a higher Ca2+ concentration and a lower pH were required. V max, but not K max, varied with the concentration of NaCl. The addition of 3% (w/v) NaCl to growing cultures of S. aureus increased nuclease production fivefold.
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