As far as anyone knows, only elements with atomic numbers of 1 through 94 — hydrogen through plutonium — exist in nature1. Anything 95 and above has to come from a reactor or particle accelerator. During the early 2000s physicists at Russia’s Dubna facility began generating element 118, ...
The frequency of the amide I band is mainly related to secondary structures of the protein and is based on various hydrogen-bonding interactions in the α-helix, β-sheet, β-turn, and unordered structures. The amide I vibrational frequencies of α-helices and β-sheets are about 1655 and ...