It is for this reason that is referred to as a complementary DNA or cDNA. Though there are numerous processes for synthesizing cDNA, the best way of doing so is by using mature or fully spliced mRNA. This is usually done by using the enzyme reverse transcriptase.
Ammonia is used as refrigerant prominently in the refrigeration systems of food industry like dairies, ice creams plants, frozen food production plants, cold storage warehouses, processors of fish, poultry and meat and number of other applications.
Ammonia is a common ingredient in both commercial and DIY cleaners. It is also used to produce fertilisers, plastics, synthetic fibres, dyes and pharmaceuticals. Household ammonia, bought in the cleaning section of the supermarket, is really a solution of water with 5-10% ammonium hydroxide. Cloudy ammonia is the same thing with a little soap added.