This suggests that different types of denitrifying strategies win in different biological environments. Denitrification may occur under anaerobic conditions (flooding) in the presence of denitrifying bacteria. Denitrifying bacteria use denitrification to generate ATP. Denitrifying bacteria convert the nitrate into nitrogen gas. Denitrifying bacteria are an essential component in treating wastewater. Denitrifying fungi reduce NO using P-450nor soluble enzyme. NO is generated in the denitrifying cell by the activity of respiratory NO reductase. Denitrifying bacteria are a diverse group of bacteria that encompass many different phyla. "Paracoccus denitrificans", is a gram-negative, coccus, non-motile, denitrifying (nitrate-reducing) bacterium. Many denitrifying bacteria can also use ferric iron () and some organic electron acceptors. The specific epithet "denitrificans" is a New Latin participle adjective meaning denitrifying. Denitrifying include for example several species of "Pseudomonas", "Alkaligenes" , "Bacillus" and others.