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Antibacterial activity of silver nanoparticles synthesized using Trichoderma harzianum filtrate, as determined by disc diffusion method. (A) Staphylococcus aureus (Gram-positive); (B) Ralstonia solanacearum (Gram-negative). C: Positive control (streptomycin); AgNPs: silver nanoparticles; AgNO3: silver nitrate; E: negative control (Trichoderma harzianum culture filtrate).
