This compound’s oceanic metabolism is dominated by mesophilic Thaumarchaeota (“thaum-ar-kee-OH-tuh”) with extremely high enzymatic affinities for it. In 2015, Maartje (“MAR-juh”) van Kessel showed that a common two-step oxidation of this compound can be performed by a single bacterial species rather than requiring two species. It doesn’t contain sulfur, but benthic bacteria like Beggiatoa (“BEH-jee-uh-TOH-uh”) and Thioploca (“THIGH-oh-plo-kuh”) can form this compound through DNRA. Dense membranes of ladderanes are found in (10[1])bacteria that perform (-5[1])anaerobic oxidation of this compound (-5[2])via the (10[1])anammox pathway. (10[2])Organic matter (-5[1])mineralization (10[1])releases nitrogen in the form of this compound’s (10[1])conjugate (10[1])acid, which along with nitrate is the main (10[1])plant-available form of nitrogen. (10[3])For 10 points, name (10[1])this strong-smelling, (-5[1])nitrogen-containing gas used as fertilizer (10[1])feedstock. (10[3]-5[1])■END■ (10[7])