Abstract
Frei and Preston1 have described the discovery of a two-strand helical model for a β-1,3-linked xylan polymer which is the structural polysaccharide in some siphoneous green algae. We have recently proposed a new structure for this material2 in which six β-1,3-linked xylose residues form a helix of pitch 18.36 A, three such helical chains intertwining with line symmetry sr3. The compound helices are regularly positioned in a hexagonal lattice. Preliminary results show that the diffraction intensities observed on the rather good X-ray fibre diagram agree well with the computed values for our model (to be described elsewhere).
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