4 citations
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July 2010 in “International Journal of Cosmetic Science” This study observed that hair fibers in older women become more curved with age, decreasing hair luster due to their disordered alignment and structural differences between the convex and concave sides.
January 2009 in “Nihon Keshouhin Gijutsushakaishi/Journal of S C C./Nihon Keshouhin Gijutsushakai kaishi” This study found that the structural and chemical composition of human curly hair may resemble that of sheep wool, implying a shared characteristic among mammals with wavy hair.
3 citations
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July 2003 in “PubMed” This study found that laser-based goniophotometry can effectively monitor changes in hair surface reflection related to color and cuticle cell tilt across different ethnic origins.
February 2024 in “Journal of Dermatological Science” This study examined the formation of acquired curved hair and found that the fusion of hair matrix cells during follicle regeneration contributes to asymmetric follicle shapes and curved hair, potentially linked to changes in type IV collagen and protein expression levels.
June 2001 in “International Journal of Cosmetic Surgery and Aesthetic Dermatology” This study evaluated the learning curve for using the Hair Implanter Pen, finding it to be operator dependent.