Well, actually, Jmol isn't supposed to be rendering ribbons with 
carbohydrates -- that's a bug. (trace, yes; ribbon, no), and the trace 
also is too crude -- we aren't checking for connected monomers yet.
A good example of how this does NOT work correctly is with

load =1uh3;display carbohydrate;ribbon on

Bob


Angel Herraez wrote:

>Bob wrote:
>
>  
>
>>Neither of these solutions is impossible. I propose we implement the
>>second -- a ribbon associated with carbohydrates. Jmol already identifies
>>chains of carbohydrates and can show a trace through the anomeric carbon
>>atoms. 
>>    
>>
>
>Wow, I didn't know that ribbons were already implemented for carbohydrates! 
>This makes my 
>efforts to draw curves unneccesary.
>
>On models with straight amylose helix (30 to 100 residues), ribbons are 
>already quite 
>adequate, at least in this PDB model where all the C1 atoms are correctly 
>labeled. Some 
>funny effects at seen at spots, but I need to check if the atoms are properly 
>labeled before I 
>complain.
>
>
>  
>
>>What is needed to make ribbons would be to identify the second
>>atom. This could be easy or difficult, depending upon how that is defined.
>>Can you tell us what you would use to define the ribbon? Once we have
>>that, it is possible that this could be implemented very easily.
>>    
>>
>
>Right now the orientation of the ribbon is OK (tangent to the helix). I will 
>have to look at other 
>models that are not so regular and have other monosaccharides than glucose.
>Will come back to this when I have some hints.
>(I'm leaving for vacation this afternoon)
>
>
>  
>
>>If you will work with me and have a good idea of
>>    
>>
>
>This can be a promising starting point. Some people have published two nice 
>algorithms for 
>cartoon-type rendering of carbohydrates, implemented in their own software and 
>on the way 
>to get implemented in VMD. I have already talked to them about the possibility 
>to add that to 
>Jmol. If we have a simple ribbon already worked out, it will help future work 
>for the more 
>sophisticated renderings.
>
>
>
>
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-- 
Robert M. Hanson
Professor of Chemistry
St. Olaf College
Northfield, MN
http://www.stolaf.edu/people/hansonr


If nature does not answer first what we want,
it is better to take what answer we get. 

-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900



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