Different treatments change the strength and flexibility of human hair.
March 2018 in “Journal of Experimental Biology” Hair curliness is caused by the arrangement and length of two different cell types.
2 citations
,
January 2010 Tianzhu white yak hair varies in structure and density between fuzz and coarse hair.
6 citations
,
January 2005 in “PubMed” Cotton honeydew extract improves hair smoothness and reduces damage.
5 citations
,
January 1988 Only two of the four keratin genes are expressed in wool fibers.
October 2023 in “Materials chemistry and physics (Print)” Adding keratin to a mix of cow hair and plant-based plastic makes it stronger.
12 citations
,
September 2010 in “Clothing and Textiles Research Journal” Poplar seed hair fibers could be an eco-friendly insulation for textiles.
9 citations
,
June 2024 in “Genes” Key genes linked to wool quality in Spanish Merino sheep can improve fine wool production.
1 citations
,
June 2025 in “Frontiers in Genetics” Key genes IRF2BP2 and EGFR are linked to Hetian sheep's double-coat fleece.
August 2024 in “Biophysics Reviews” Mammal hairs have different internal structures.
4 citations
,
July 2024 in “Animals” The KRTAP19-5 gene affects wool curvature in Chinese Tan sheep, with Variant B reducing curvature.
March 2026 in “World Rabbit Science” DKK4 can be used to improve wool quality in Zhexi Angora rabbits.
4 citations
,
January 2005 in “Indian Journal of Animal Research” Goat neck skin has a complex network of collagen, elastic, and reticular fibers.
Hair feels different when touched and rubs together in various ways.
9 citations
,
July 2014 in “Skin research and technology” Stretching damages Caucasian hair's structure more easily than Asian hair.
January 2009 in “Nihon Keshouhin Gijutsushakaishi/Journal of S C C./Nihon Keshouhin Gijutsushakai kaishi” Curved human hair has different structures on each side, which might cause its shape and is similar to wool.
11 citations
,
July 2021 in “Genetics selection evolution” Researchers found genes and genetic variants linked to sheep wool and skin wrinkles.
16 citations
,
January 2018 in “Advances in experimental medicine and biology” Hair and wool have diverse keratins and keratin-associated proteins.
47 citations
,
June 2017 in “The FEBS journal” Disabling the FGF5 gene in sheep leads to longer wool.
8 citations
,
January 2009 in “Transactions of the Materials Research Society of Japan” Water-soluble wool keratin can protect human hair from damage during treatments.
3 citations
,
July 2012 in “Sokoto Journal of Veterinary Sciences” As sheep age, their hair fibers and follicles grow larger and more organized, with no significant differences between males and females.
29 citations
,
September 2017 in “Genes” Selecting specific KRTAP26-1 gene variants can improve wool quality in sheep.
29 citations
,
October 2017 in “Journal of proteomics” The research found specific proteins that affect fiber characteristics and hair growth in sheep and goats.
June 2026 in “Frontiers in Cell and Developmental Biology” Dermal papilla cells are key to fine wool growth in sheep.
7 citations
,
August 2009 in “Applied Mathematics and Mechanics-English Edition” Hair fibers have fractal patterns with properties related to the golden mean, which may affect their functionality.
12 citations
,
February 2011 in “Zenodo (CERN European Organization for Nuclear Research)” Hair properties vary with age and ethnic origin.
January 2009 in “Chinese journal of Clinical Medicine” 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.
12 citations
,
February 2019 in “Skin research and technology” White hair has less lipid content and absorbs water differently than brown hair.
5 citations
,
January 2021 in “Animal Production Science” Lipid metabolism affects wool fiber diameter in sheep.