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(a) Mechanism of extracellular/intracellular synthesis of NPs by microbial enzymes and/or metabolites. (b) Lactobacillus bacterial cell can serve as support and reducing agent for the formation of NPs. Reprinted with permission from Refs (Sengani et al., 2017; Parandhaman et al., 2019; Nair and Pradeep, 2002).
