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Assays of AA and NA in soil. (A) The scheme for AA assays in soil (details are given in SI Materials and Methods). (B) Results of assays of AA in soil. (C) Activity levels in soil at points A, B, and C as determined by distances from the bacterial inoculum. (D) Assays for different NA levels in soil. (E) Assay of the nematode-immobilizing ability of B. nematocida strain B19 in natural soil.
