Abstract
WE have recently stated that if silk II (for example, silk of the cocoon filament1) is treated with hot alkali, there appears in X-ray diagrams at the equator one reflexion of 45 A., besides some additional higher orders (silk III2). Diagrams of higher-orientated samples show that the net plane with D= 45 A. coincides with the equator reflexions (D= 9.15 and 4.57 A.), which, as is well known, represent the plane of the flat micelles. The 45-A. reflexion is much more intense and sharp than the equator reflexions of 9.15 and 4.57 A.
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