Figure 3.

A: Graph representing dependence of AgNP formation reaction rate on the concentration of glucose within the EPS matrix. Number refers to collection site (B), whereas letters A–C denote three different samples collected at each site. With the exception of samples 3A and 3C, a higher glucose concentration resulted in a higher rate of NP formation. B: Map illustrating the 12 sampling sites (6 up- and 6 downstream from wastewater treatment plant; noted by numbers 1–12) used for the collection of stream biofilms. Three samples per site were collected (noted as A, B, and C).