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.
4130 steel commonly referred to as chromoly is a chrome alloy steel with medium carbon content containing .80 â 1.10% chromium as the strengthening agent.130 steel sheet is considerably stronger and harder than other standard steel grades and is commonly used in construction of commercial and military aircraft. TW stocks a wide range of sizes in 4130 steel certified to AMS 6350/6351 â annealed and AMS 6345 for Normalized or otherwise heat treated.