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.
The properties of a polysaccharide molecule depend on: 1  its length (though they are usually very long) 2  the extent of any branching (addition of units to the side of the chain rather than one of its ends) 3  any folding which results in a more compact molecule. 4  whether the chain is 'straight' or 'coiled'.