Period 5 element with most production coming from the Xikuangshan Mine in Hunan. Antimony compounds are prominent additives for chlorine and bromine containing fire retardants found in many commercial and domestic products. The largest application for metallic antimony is as alloying material for lead and tin. It improves the properties of the alloys which are used as in solders, bullets and ball bearings. An emerging application is the use of antimony in microelectronics. Tellurium is a chemical element that has the symbol Te and atomic number 52. A brittle, mildly toxic, rare, silver-white metalloid which looks similar to tin, tellurium is chemically related
Chemical ligation by native chemical ligation." "Science". 266:776-9. Muir TW. 2003, "Semisynthesis of proteins by expressed protein ligation." "Annu Rev Biochem". 72:249-89. Nilsson BL, Soellner MB, Raines RT. 2005, "Chemical Synthesis of Proteins." "Annu. Rev. Biophys. Biomol. Struct." 34:91-118 Bang D, Pentelute BL, Kent SB. 2006, "Kinetically controlled ligation for the convergent chemical synthesis of proteins." "Angew Chem Int Ed Engl." 45:3985-8. Kent SB. 2009, "Total chemical synthesis of proteins." "Chem.Soc.Rev." 38, 338-351. . Zhang Y, Xu C, Kam HY, Lee CL, Li X. 2013, "Protein chemical synthesis by serine/threonine ligation." "Proc. Natl. Acad. Sci. USA." 17:6657-6662 Chemical ligation Chemical ligation is