An electron-microscope study of elastoidin

An electron-microscope study has been made of elastoidin from Cetorhinus maximus. Longitudinal, cross and oblique sections of permanganate-stained material have been studied.

Longitudinal sections show an extremely regular banding. The bands extend apparently over the entire width of the fibres. The same pattern of three dark stained lines occurs in all of the sections studied.

Oblique sections show a larger but less well defined period.

Cross and, indeed, the longitudinal and oblique sections have a granular appearance at the highest magnifications.

These electron-microscope observations are discussed in relation to other electron-microscope and X-ray work.