Diesel Exhaust Fluid (DEF) is a non-hazardous solution, which is 32.5% urea and 67.5% de-ionized water. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water.This system is called Selective Catalytic Reduction (SCR) and can be found on 2010 and later model year trucks and many diesel pickups and SUVs.DEF is not a fuel additive and never comes into contact with diesel. It is stored in a separate tank, typically with a blue filler cap.EF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water. This system is called Selective Catalytic Reduction (SCR) and can be found on 2010 and later model year trucks and many diesel pickups and SUVs.
Amino acids (except for glycine) have a chiral carbon atom adjacent to the carboxyl group (CO2-). This chiral center allows for stereoisomerism. The amino acids form two stereoisomers that are mirror images of each other. The structures are not super-imposable on each other, much like your left and right hands.
A compound consisting of two or more amino acids linked in a chain, the carboxyl group of each acid being joined to the amino group of the next by a bond of the type ïOCïNHï. Example sentences. 1  Among the amino acids of the peptide, the most dramatic change was the Phe residue.2  If there are only two amino acids then the peptide is a dipeptide. 3  The peptide contains complementary amino acid sequences, with alternating positive and negative charges.xample sentences. 1  Among the amino acids of the peptide, the most dramatic change was the Phe residue. 2  If there are only two amino acids then the peptide is a dipeptide. 3  The peptide contains complementary amino acid sequences, with alternating positive and negative charges.