5 citations
,
November 2012 in “Journal of the American Academy of Dermatology” A 3-year-old girl has short anagen syndrome, causing her hair to stay short.
7 citations
,
January 1981 in “Springer eBooks” The document concludes that hair biology is complex and there are still unanswered questions about hair loss and follicle changes.
43 citations
,
September 2001 in “Scanning” Hair treatments like bleaching increase friction by exposing tiny pores on the hair surface.
19 citations
,
July 2009 in “Clinical and Experimental Dermatology” The study found that long-term sun exposure does not significantly affect follicular plugs on the scalp, and the scalp's appearance is unique compared to other body parts.
1 citations
,
July 2024 in “International Journal of Cosmetic Science” Infrared techniques reveal glycogen, unsaturated lipids, and calcium compounds in hair.
January 2014 in “Journal of Pigmentary Disorders” Women's hair gets thinner and grayer as they age, with treatments available for hair loss and graying.
8 citations
,
February 2005 in “British Journal of Haematology” Chemotherapy caused the patient's hair to have alternating thick and thin segments.
January 2024 in “Medycyna Weterynaryjna” Horse breed significantly affects skin and hair thickness.
June 2012 in “International journal of scientific research” Hair follicles in androgenetic alopecia show no chemical changes, only size reduction.
Hair loss is caused by hormonal changes that shorten hair growth phases and shrink hair follicles.
January 2005 in “Seibutsu Butsuri/Seibutsu butsuri” Chemical treatments damage hair more than UV exposure, making it thinner and less flexible.
7 citations
,
May 1979 in “Medical & biological engineering & computing” The trichometer accurately measures hair growth and is easy to use.
January 2021 in “International journal of dermatology, venereology and leprosy sciences” Most adult women experiencing hair loss are aged 21-40, with the most common type being female pattern hair loss. Trichoscopy is a useful tool for diagnosing different types of hair loss.
5 citations
,
September 2017 in “Colloids and surfaces. B, Biointerfaces” Tying a knot can measure hair friction, useful for medical applications.
March 2009 in “Medical & surgical dermatology” Women with androgenetic alopecia have fewer terminal hairs, phenol in nail surgery is safe, and a new hair transplant method is faster and less damaging.
23 citations
,
December 1977 in “Virchows Archiv B Cell Pathology”
Hair feels different when touched and rubs together in various ways.
7 citations
,
November 2007 in “PubMed” Turkish women with female pattern hair loss have lower hair density, and visual counting is more effective than digital image analysis for detecting this.
44 citations
,
October 1990 in “Archives of Dermatological Research” The connective tissue around hair follicles changes structure throughout the hair cycle.
24 citations
,
September 2012 in “Dermatologic Surgery” The conclusion is that normal scalp hair counts for Taiwanese people were established, showing age-related differences but not sex or scalp location differences.
38 citations
,
July 1993 in “Journal of Investigative Dermatology” Gray hair affects hair's movement and appearance, making it less bouncy and more wavy.
3 citations
,
April 2016 in “International Journal of Dermatology” A young man was diagnosed with trichoepitheliomas, causing thick skin and hair loss.
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.
161 citations
,
July 2003 in “ACM Transactions on Graphics” Researchers developed a new model for more realistic computer graphics rendering of hair by considering how light scatters on hair fibers.
3 citations
,
February 2016 in “Dermatologic Therapy” Using minoxidil and tretinoin on the skin, along with oral vitamin D, improved hair thickness and density in two girls with woolly hair.
October 2005 in “Nature reviews. Molecular cell biology (Print)” Hairless protein is key for hair growth, cell differences cause gene expression variation, and the N-end rule pathway senses nitric oxide for protein breakdown.
32 citations
,
December 1969 in “The Lancet” Children with marasmus have more resting hair follicles and thinner, less pigmented hair, showing long-term malnutrition.
28 citations
,
July 2000 in “PubMed” Hair structure forms the same way inside and outside the body.
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.