Abstract
The mechanical properties of collagen fibres obtained from mammalian, avian, reptilian and other sources were determined under identical conditions of testing. The results showed wide variations in the mean breaking length and extension at break of the different samples tested. It is unlikely that the differences in the amino acid composition are responsible for this variation which may probably be due to the differences in the nature and extent of non-collagenous components associated with the protein. There was a correlation between the fibrillar width and the fibre strength in collagen.
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