Hi everyone,

I am working on bacteria which are capable of ammonia oxidation. Presently i have some isolates (heterotrophs) capable of utilizing ammonia but such isolates are showing negative for amoA gene (true marker for autotrophic nitrifiers) amplification. Can any one recommend some molecular genes which are ideal for heterotrophic bacteria showing nitrification. Is there any true marker or gene for heterotphic nitifiers or ammonia oxidizers.

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