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Protein Data Bank exchange dictionary (pdbx) version 1.0521




   Density value P calculated from the crystal cell and contents,
   expressed as per cent solvent.

   P = 1 - (1.23 N MMass) / V

   N     = the number of molecules in the unit cell
   MMass = the molecular mass of each molecule (gm/mole)
   V     = the volume of the unit cell (A^3^)
   1.23  = a conversion factor evaluated as:

           (0.74 cm^3^/g) (10^24^ A^3^/cm^3^)
                (6.02*10^23^) molecules/mole

           where 0.74 is an assumed value for the partial specific
           volume of the molecule

Type: float

Mandatory item: no

The permitted range is [0.0, infinity)

Category: exptl_crystal