Abstract
A series of density determinations on physically and chemically modified wools shows that extensions up to 70% and supercontraction of 15% in steam are not accom panied by density changes. In contrast, residues from chemical extractions and en zymatic digestions show significant increases. Cortical cells fractionated from trypsin digests by gradient column techniques have densities comparable to that of porcupine quill tips. The extent to which these measurements may be correlated with crystallinity is discussed.
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