Herbicide toxicity to Nitrospirillum amazonense: assessing bacterial survival and microbial functionality.

The Brain–Cousens model was applied to assess the occurrence of hormesis; however, although the visual pattern suggested such an effect, the estimated parameters ( R 2 = 0.72; e , P = 0.299; f , P = 0.306) did not reach statistical significance (Fig. 3 ).

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