Triggers of nonallergic rhinitis symptoms vary and can include certain odors or irritants in the air, changes in the weather, some medications, certain foods, and chronic health conditions. A diagnosis of nonallergic rhinitis is made after an allergic cause is ruled out.
DNA extraction. For the various methods, see Nucleic acid methods. DNA isolation is a process of purification of DNA from sample using a combination of physical and chemical methods. The first isolation of DNA was done in 1869 by Friedrich Miescher. Currently it is a routine procedure in molecular biology or forensic analyses.
Reverse transcription. Definition. noun. The process of making a double stranded DNA molecule from a single stranded RNA template through the enzyme, reverse transcriptase. Supplement. It is called reverse transcription because it is a process in opposite or reverse of transcription.See also: reverse transcriptase.everse transcription. Definition. noun. The process of making a double stranded DNA molecule from a single stranded RNA template through the enzyme, reverse transcriptase. Supplement. It is called reverse transcription because it is a process in opposite or reverse of transcription. See also: reverse transcriptase.