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15N-N2O uptake and 15N-N2 emission by detached soybean nodules formed with Bradyrhizobium japonicum USDA110 (A) and the nosZ mutant USDA110ΔnosZ (B). 15N-labeled N2O was supplied to vials (15 ml) containing soybean nodules (1.6 to 1.8 g). Five independent experiments gave similar results.
