The characteristics of a novel heterotrophic nitrification-aerobic denitrification bacterium, Bacillus methylotrophicus strain L7

► Heterotrophic nitrification-aerobic denitrification of Bacillus methylotrophicus. ► Transform NH3 to N2O and NO2- to N2 for G+ bacteria were never described. ► Nitrite other than nitrate was employed as denitrification substrate. ► GC-MS and GC-IRMS revealed a different gaseous nitrogen compound emitting pattern.