Surprise: One organism responsible for nitrification instead of two

It could never be found until recently, in a fish tank a few floors below Radboud University's microbiology department: one single organism able to perform the complete process of nitrification. Microbiologists used to think that two distinct groups of bacteria were responsible for the stepwise oxidation of ammonia to nitrate via nitrite. Nature magazine publishes the results – which have implications on climate research and wastewater treatment – on November 26.

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