45 citations
,
December 2006 in “Biopolymers” Permanent waving weakens hair by altering its protein structure.
12 citations
,
January 2014 in “Cell structure and function” Different combinations of human hair keratins affect how hair fibers form.
49 citations
,
June 2004 in “Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences” Human hair becomes weaker and stretches more easily at higher temperatures.
7 citations
,
August 2006 in “Biopolymers” Researchers extracted tiny keratin filaments from human hair by unzipping its outer layer.
9 citations
,
April 2019 in “Journal of structural biology” Hair's internal fibers are arranged in a pattern that doesn't let much water in, and treatments like oils and heat change how much water hair can absorb.