Different treatments change the strength and flexibility of human hair.
July 2025 in “International Journal of Cosmetic Science” A new 6-point scale reliably measures heat damage to hair from styling tools.
February 2019 in “PubMed” The research found that twisting hair fibers can show changes in stiffness and damage, and help tell apart different hair treatments.
1 citations
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July 2021 in “Forensic science international” Both a lock of hair and a single hair strand can show chronic drug use, but at least six single hairs are needed for accurate results.
3 citations
,
November 2021 in “Frontiers in Genetics” Certain genes are linked to the quality of cashmere in goats.
1 citations
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November 2020 in “Research Square (Research Square)” The study found specific skin cells and genes that may affect the quality of cashmere in Liaoning Cashmere Goats.
The conclusion cannot be provided because the document is not accessible.
30 citations
,
March 2019 in “Archives animal breeding/Archiv für Tierzucht” The KRTAP15-1 gene affects cashmere fiber thickness in goats.
July 2023 in “British journal of dermatology/British journal of dermatology, Supplement” Aging changes scalp cells, possibly affecting hair health in older women.
2 citations
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August 2022 in “Animals” Different versions of the KRTAP6-2 gene in goats can lead to thinner cashmere fibers.
98 citations
,
June 2008 in “Human mutation” A genetic change in the EDAR gene causes the unique hair traits found in East Asians.
65 citations
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May 2006 in “Journal of Structural Biology” Hair curliness is due to uneven distribution of different cortices within the hair fiber.
9 citations
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June 2020 in “European Radiology Experimental” 15-Gy x-ray irradiation temporarily alters rat calvaria skin without causing significant inflammation or fibrosis.
June 2026 in “Frontiers in Cell and Developmental Biology” Dermal papilla cells are key to fine wool growth in sheep.
5 citations
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September 2017 in “Colloids and surfaces. B, Biointerfaces” Tying a knot can measure hair friction, useful for medical applications.
89 citations
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August 2008 in “Human genetics” The EDAR gene greatly affects hair thickness in Asian populations.
Certain gene variations in sheep are linked to stronger wool.
The KRT84 gene is linked to better wool quality in Gansu Alpine Fine-wool sheep.
January 2024 in “Kafkas Universitesi Veteriner Fakultesi Dergisi” A specific genetic variation affects wool quality in sheep.
July 2022 in “New Zealand journal of agricultural research” The KRTAP27-1 gene variations in sheep may affect wool length and weight.
42 citations
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January 2017 in “Genes” The gene KAP22-1 affects wool yield and fiber shape in sheep.
1 citations
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September 2023 in “Animals” A new goat gene affects cashmere fiber thickness; certain variations can make the fibers coarser.
March 2024 in “Research Square (Research Square)” The TT genotype of a specific SNP in sheep is linked to better wool quality.
10 citations
,
November 2021 in “International journal of molecular sciences” Sheep and goat hair fibers are complex due to keratin-associated proteins, which are important for fiber properties and growth.
Rat skin develops from a single layer to adult-like skin with hair follicles by day 21.
2 citations
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May 2023 in “Journal of Advanced Research” Two mutations in KRT74 and EDAR genes cause sheep to have finer wool.
11 citations
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July 2004 in “International Journal of Cosmetic Science” The conclusion is that a new method to measure hair shine was confirmed to match people's visual assessments.
7 citations
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July 2004 in “International Journal of Cosmetic Science” Different hair types from various ethnic groups affect hair shine due to characteristics like thickness and shape.
February 2026 in “Small Ruminant Research” The IRF2BP2 gene affects sheep fleece quality by influencing fiber traits.
15 citations
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January 2017 in “Lasers in Surgery and Medicine” Laser treatment improved scalp skin condition with no side effects.