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Functional diversity of microbial communities under the four different AgNPs treatment at the EC20, EC60, and EC90 levels. The bars are the standard errors of the means (n = 3). The different letters above the bar in the same EC level indicate significant differences between different treatments at p < 0.05 level (0-control, 1:50–80 nm nanoplates, 2:15 nm nanospheres, 3:20–40 nm nanospheres, and 4:50 nm nanorods).
