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Extracellular β-glycosidase activity of B. thuringiensis, P. mosselii, S. meliloti, and A. chroococcum exposed to 1000 μg mL–1 each of Ag-NPs and ZnO-NPs. Absorbance of o-nitrophenol at 420 nm is plotted against NP concentrations. Values are mean of three independent replicates ± SD. Asterisks indicate significant difference at *P < 0.05 and **P < 0.001.
