Abstract
An electron diffraction study has been made of oriented polyglycine I (the β modification of polyglycine) and of single crystals grown from solution. The unit cell is very similar to that postulated by Astbuŕy (1949). It is monoclinic with parameters a = 9.54 Å, b( chain axis) = 7.044 Å, c = 3.67 Å and β = 113°. Examination of the possible structures suggests that polyglycine I does not have the familiar antiparallel pleated sheet, but rather the closely related antiparallel rippled sheet structure first described by Pauling & Corey (1953a).
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