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.
- In essence, Welder Qualification using P1 base metal qualifies for P1 to P11 material as long as your filler wire/ electrode is equivalent as per your WPS.SME Section IX Welder Qualification related Question. As mentioned in section IX for qualification of welder or welding. operator use qualified WPS with supporting PQR's, if our PQR is welded. with P No- 8 to P No-8 (SA 240 TP 316L TO SA 240 TP 316L).