Ammonia and the Haber process. Ammonia. Ammonia (NH3) is a compound [compound: A compound is a substance formed by the chemical union (involving bond formation) of two or more elements. ] of nitrogen and hydrogen. It is a colourless gas with a choking smell, and a weak alkali which is very soluble in water.
Latent tuberculosis infection (LTBI) is a condition in which a person is infected with M. tuberculosis, but does not currently have active tuberculosis disease.
latent virus. A virus that has the ability to infect the host, initially causing little or no evidence of illness but persisting for the lifetime of the infected host; later on, a specific triggering mechanism may cause the virus to produce a clinically apparent disease.atent virus. A virus that has the ability to infect the host, initially causing little or no evidence of illness but persisting for the lifetime of the infected host; later on, a specific triggering mechanism may cause the virus to produce a clinically apparent disease.