Ammonia-oxidizing archaea (AOA) are some of the most abundant microorganisms in the ocean and play a key role in nitrogen cycling. Yet, despite their ubiquity, scientists have long puzzled over how ...

Ammonia can be produced by the break-down of amino acids, or by the gut bacteria in humans. If the level of ammonia in the blood becomes too high, then it becomes toxic to the brain. The urea cycle ...

Resides In: West Des Moines, Iowa Background Gil Gullickson grew up on a Langford, South Dakota, century farm that he today owns. In 2005, Gil joined Successful Farming to cover agronomy and ...