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CH3041
THE ‘N’
MICROORGANISMS II
• Nitrification (ox): the
oxidation of inorganic N provides the E for metabolic
processes.
The bacteria are lithotrophs (electron donor)
The bacteria are lithotrophs (electron donor)
NH3 + 3/2O2 ® H+ + NO2- + H2O nitrosomonas
NO2- + ½O2 ® NO3- nitrobacter
• Denitrification (red): a
major N2 return pathway
major N2 return pathway
NO3- + 5/4{‘CH2O’}
+ H+ ®
½N2 + 7/4H2O + 5/4CO2
½N2 + 7/4H2O + 5/4CO2
rhizobium
Rhizobium
Nitrosomonas
Nitrobacter
Rhizobium
