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.
Shell Helix SN is a range of motor oils that meets the latest ILSAC GF-5 and API SN specifications which demand. improvements in fuel economy, emission system protection and engine oil robustness for gasoline engines. Shell helix. diesel. Shell Helix Diesel is specially formulated for diesel engines.