From: Miguel Howard <[EMAIL PROTECTED]>
Date: Thursday, November 27, 2003 9:43 am
> 
> We think we understand what is intended by the expressions
>  select *.fe
> and
>  select *.ca
>... 
> Q: There is a calcium atom in the .pdb file and we evaluate the
> expression 'select *.ca' ... Should the calcium atom be selected?
> 

As an inorganic chemist using pdb, I always regarded 'ca' in chime/rasmol as a 
reserved word for use as in the series ca, cb, cg (for describing amino acids) rather 
the series mg, ca, sr, ba (elements, etc.), and this wasn't bothersome or worrisome as 
long as I could specify 'select calcium' or 'select *.calcium' and get by. (In fact, 
it makes the script just a bit more readable.)

On the other hand, I do have occasion to work with iron atoms of different oxidation 
states within the same mineral, for example Fe2+ and Fe3+ in magnetite, and I'd like 
to be able to easily specify, color, and size them differently in the visualization.

--Phil Barak



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