Crystal Structure of Amylose Triacetate: A Nonintegral Helix

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Science  30 Dec 1966:
Vol. 154, Issue 3757, pp. 1658-1659
DOI: 10.1126/science.154.3757.1658


The x-ray diffraction diagram of an oriented fiber of amylose triacetate I, presenting evidence for a nonintegral helical structure, was analyzed by a model and by Fourier transform calculation. The results suggest a helical structure with 4.67 ± 0.02 residues per one turn of the helix, which appears to be left-handed.