Abstract
It is pointed out that the observed spacings of the equatorial diffraction patterns from five fibrous proteins can be described by a simple general equation; the diffracting systems giving rise to these reflections are termed one-dimensional. Various two-dimensional packing arrangements of cylindrically symmetrical diffracting units that are restricted in lateral extent can give rise to one-dimensional diffraction patterns; the reflections from such systems are termed non-Bragg maxima. For a restricted hexagonal lattice two sets of non-Bragg maxima are possible. One set is at higher spacings than the 10ī0 spacing of the infinite hexagonal lattice, while the other set differentiates into the normal hexagonal set as the lattice size increases. The theory is applied to the equatorial diffraction of collagen and an alternative lattice is suggested to the cylindrical lattice of Ramachandran & Sasisekharan (1956) . New suggestions are made for the structures of both feather keratin and F-actin.
Published Version
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