Risk which is common to an entire class of assets or liabilities. The value of investments may decline over a given time period simply because of economic changes or other events that impact large portions of the market.
Properties of the alpha-helix. 1  The structure repeats itself every 5.4 Angstroms along the helix axis, ie we say that the alpha-helix has a pitch of 5.4 Angstroms. Alpha-helices have 3.6 amino acid residues per turn, ie a helix 36 amino acids long would form 10 turns.
A. Helices. 1  The Î±-helix is the classic element of protein structure. A single Î±-helix can order as many as 35 residues whereas the longest Î² strands include only about 15 residues, and one helix can have more influence on the stability and organization of a protein than any other individual structure element.