[Chimera-users] Principal axis of inertia

[Eric Pettersen]

On May 15, 2009, at 10:40 AM, Tom Goddard wrote:

> Hi Armida,
>
>  Elaine is right.  The atoms are weighted by their mass, carbon counts
> 12 times more than a hydrogen.  Isotopic abundances are not considered
> -- I think Chimera's atom.element.mass is just the number of protons  
> plus neutrons in the post prevalent isotope.

The mass is the number from the periodic table of the elements --  
which is an average across isotopes.

--Eric

                         Eric Pettersen
                         UCSF Computer Graphics Lab
                         http://www.cgl.ucsf.edu

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