Role of antioxidants in health maintenance. Sardesai VM. Free radicals are produced in the body as by products of normal metabolism and as a result of exposure to radiation and some environmental pollutants. Because they are highly reactive, they can damage cellular components and are implicated in a variety of diseases.
P1 Material is the name given to Carbon Manganese Steel in the engineering industry.hus finally the P residue describes the aminoacid or molecule which can be found at that specific location of substrate.    P4-P3-P2-P1------P1'-P2' ------ = point of cleavage   S4-S3-S2-S1-[C]-S1'-S2'-S3'    Reference: Schechter and Berger (1967) On the size of active sites in proteases (Biochem. Biophys. Res.
Polyethylene (abbreviated PE) or polyethene (IUPAC name polyethene or poly(methylene)) is the most common plastic.The annual global production is approximately 80 million tonnes.olyethylene is a thermoplastic polymer consisting of long hydrocarbon chains. Depending on the crystallinity and molecular weight, a melting point and glass transition may or may not be observable. The temperature at which these occur varies strongly with the type of polyethylene.