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 TB is when a person has TB bacteria in their body but there are no symptoms, so they donât feel unwell. You cannot pass latent TB on to others, but there is a risk that you will become ill with active TB later on, especially if your immune system is weakened, such as through another illness.ou have a greater risk of catching TB (active or latent) if you: 1  know someone who has had TB in their throat or lungs. 2  live or work in poorly ventilated or overcrowded conditions, where TB can spread more easily. 3  have links to areas of the world where TB is more common, such as Africa, Asia or Eastern Europe.