Alcaligenes Denitrificans Pseudomonas citronellolis Bacillus Licheniformis Pseudomonas stutzeri Bacillus macerans Pseudomonas syringae   Bacillus Polymyxa Rhodopseudomonas palustris  Bacillus Subtilus Rhodopseudomonas viridis Citrobacter Braakii Rhodospirillum centenum  Citrobacter freundii Rhodospirillum fulvum  Comamonas Testosteroni Rhodospirillum molischianum (Phaeospirillum moliscianum) Flavobacter aquatile  Rhodospirillum rubrum Flavobacter oceanosedimentum  Saccharomyces cerevisiae  Nitrobacter alcalicus Thiobacillus denitrificans  Nitrobacter sp. Thiobacillus novellus Nitrobacter winogradski  Thiobacillus thiooxidans Nitrococcus mobilis Thiobacillus thioparus Nitrosomonas europaea