Calculation of Vm (Matthew's number)

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Calculation of Vm (Matthew's number)

Vm (specific volume) is calculated using the formula: Vm = V/(n*m), where,
    Vm = volume of the unit cell,
    n = the number of asymmetric units,
    M = molecular weight of contents of the asymmetric unit

One expects a Vm of between 1.68Å**3/dalton and 3.53Å**3/dalton.

Solvent content is also calculated by: solvent content = (1 - 1.23/Vm)

a		b		c		alpha		beta		gamma

molecular mass in each monomer	daltons
number of monomers in the asymmetric unit
number of asymmetric units

Hint: if your system involves more than one size of monomer, put the total of all monomers in the mass of monomer box and set the number of monomers to 1.


Volume of the cell:	Å**3
Vm	Å**3/dalton
Solvent Content

To Do Additional Calculations: Change the appropriate values above and press CALCULATE again.

Last revised: Thursday, 25-Apr-2002 13:21:24 EDT