Polymer conformation: 3. Rapid methods for seeking contact-free double helices |
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Authors: | SA Foord EDT Atkins |
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Institution: | H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 ITL, Belgium |
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Abstract: | A methodology for mapping helix constraint surfaces and contact-free molecular structures, as introduced in parts 1 and 2 of the series1,2, has been developed and extended to include investigation of stability and stereochemical feasibility of double helices. The motivation for this development was prompted by practical considerations concerning the interpretation of new X-ray fibre diffraction patterns obtained from the gelling polysaccharide agarose3, in the light of previous interpretations4 favouring a double helix model for this biopolymer. The method may be of use for objectively scrutinizing double helix structures the interpretation of a number of which, e.g. carrageenan5,6, poly(methyl methacrylate)7,10, isotactic polystyrene11,12, xanthan gum13,16, appear to be controversial issues. |
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Keywords: | Polymer conformation double helix X-ray fibre diffraction biopolymers |
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