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(A) NO‐N (ng l−1) and (B) sulfide (mg l−1) production in feed medium with or without cysteine or Na2S supplemented (4 or 20 mmol l−1) inoculated or abiotic after 24 h of incubation. The mean ± SD is shown. The asterisk indicates significant differences compared to the feed without cysteine (P < 0.05).
