Nitrous oxide reduction and nitrogen production by Pseudomonas denitrificans, as well as culture growth rates all increased 2-3 fold when cultured in the presence of perfluorocarbon emulsions (10% v/v) as compared to control cultures grown in the absence of perfluorocarbons. Initial nitrous oxide concentrations for consecutive experiments were 0.7 and 1.2 mM respectively.