Nitrosomonas aestuarii
Nitrosomonas aestuarii is a gram-negative , aerobe , bacterium from the genus of "Nitrosomonas" which metabolize ammonia to nitrite for its source of energy . 
<triplet> gram-negative <subj> bacterium <obj> subclass of <triplet> Nitrosomonas <subj> gram-negative <obj> Gram staining