Abstract
INVESTIGATIONS of the low angle X-ray diffraction patterns of various α-keratins have established the presence of structural regularities with an axial pseudo-period of 198 Å (ref. 1). Evidence of chemical reactivity associated with longitudinal periodicity was first obtained by Kratky et al.2, who noted the appearance of intense low-angle meridional reflexions in human and horse hair which had been treated with nitric acid. Apart from a partial decomposition of the keratin, the main chemical effect of this treatment is nitration of the tyrosine residues.
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References
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HEIDEMANN, G., HALBOTH, H. X-ray Evidence of Regularly Distributed Lysine in α Keratin. Nature 213, 71–72 (1967). https://doi.org/10.1038/213071a0
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DOI: https://doi.org/10.1038/213071a0
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