TLDR Curved human hair has different structures on each side, which might cause its shape and is similar to wool.
In the 2009 study on the microstructure of curved human hair, researchers discovered asymmetrical structures and compositions between the convex and concave sides of the hair. The convex side exhibited faster permeation for fluorescein isothiocyanate, smaller and more dispersed macrofibrils, a spiral arrangement of intermediate filaments, and higher levels of acidic amino acids and glycine. Conversely, the concave side had larger, fused macrofibrils, intermediate filaments aligned parallel to the hair axis, and higher levels of cysteine. These structural and compositional differences may contribute to the curved shape of hair and are similar to the characteristics found in wool, indicating a possible commonality in the structure of curved hair across mammals.
85 citations,
October 2007 in “International Journal of Dermatology” Curly hair shape is due to uneven growth patterns in the hair follicle.
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December 2002 in “Journal of biological chemistry/The Journal of biological chemistry” Researchers mapped and categorized specific keratin-associated protein genes on human chromosome 21q22.1.
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July 2010 in “International Journal of Cosmetic Science” Curved human hair has different structures on its convex and concave sides.
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September 2021 in “International Journal of Molecular Sciences” Chitosan, a natural substance, can be used to create tiny particles that effectively deliver various types of drugs, but more work is needed to improve stability and control of drug release.
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November 2022 in “Molecules/Molecules online/Molecules annual” Low-molecular weight hyaluronate can make damaged hair stronger.
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April 2006 in “American Journal of Pathology” SGK3 is essential for proper hair growth and health.
