[Q] Sign convention for torsion angles
Maria Ortner
maria at Zenzi.came.sbg.ac.at
Tue May 13 09:03:11 EST 1997
Hi!
I have a question concerning the definiton of the sign of torsion angles
in peptides. I know of the IUPAC-IUB definition, which is e.g.
decribed at URL:http://www.chem.qmw.ac.uk/iupac2/misc/ppep1.html#160.
I heard of a so-called 'mathematical' definiton
for the sign of torsion angles, which is said to be opposite to
the 'chemical' one. Unfortunately now I cannot find any literature
which explains the mathematical definition, nor something where
comparison is done.
So I ask if anybody can give me hints to the following
questions:
How is the sign of a torsion angle defined mathematically?
Is the term 'chemical convention' identic to the IUPAC-IUB nomenclature?
Has there been an older chemical convention, which is opposite from
the one described in IUPAC-IUB?
Thanks for any help,
Maria
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Maria Ortner
Center of Applied Molecular Engineering
University of Salzburg, Austria
Maria.Ortner at came.sbg.ac.at
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