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Table 2 Antimicrobial activity of metal nanoparticles against Gram positive bacteria

From: Extracellular synthesis of zinc oxide nanoparticle using seaweeds of gulf of Mannar, India

Metal nanoparticles S. mutans M. luteus
Zinc ++ +
Penicillin (Antibiotics)
Amphotericin (Antibiotics) + +
  1. –, No activity; +, weak activity (<5 mm zone of inhibition); ++, moderate activity (>5 mm zone); +++, strong activity (>10 mm zone).