Characterization of Curved Hair of Japanese Women with Reference to Internal Structures and Amino Acid Composition

September 2008 in “ PubMed ”

Shinobu Nagase, Masaru Tsuchiya, Takayoshi Matsui, Satoshi Shibuichi, Hiroji Tsujimura, Yoshinori Masukawa, Naoki Satoh, Takashi Itou, Kenichi Koike, Kaoru Tsujii

hair curvature transmission electron microscopy TEM amino acid composition ortho-cortical cells para-cortical cells hair curl electron microscopy

TLDR Japanese women's curved hair has an uneven internal structure and varying amino acid composition.

The study quantitatively investigated hair curvature in 230 Japanese women aged 10 to 70 years, finding that 53% had straight hair and 47% had curved hair with an average curl radius of 4.4 +/- 2.3 cm. Transmission electron microscopy (TEM) revealed an inhomogeneous internal structure in curved hair, with different amino acid compositions between the outer and inner regions. These findings were similar to the differences observed between ortho- and paracortical cells in wool fibers, suggesting a universal structure for curved mammalian hair.

View this study on pubmed.ncbi.nlm.nih.gov →

Discuss this study in the Community →

Research cited in this study

1 / 1 results

research Characterization of a First Domain of Human High Glycine-Tyrosine and High Sulfur Keratin-Associated Protein Genes on Chromosome 21q22.1

100 citations, 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.

Related Research

7 / 7 results

research New Aspects of the Structure of Human Hair Based on Optical Microscopic Observations of Disassembled Hair Parts

1 citations, July 2015 in “PubMed”

Human hair's strength comes from a honeycomb-like structure and macrofibrils.

research Changes in Structure and Geometric Properties of Human Hair by Aging

21 citations, July 2010 in “International Journal of Cosmetic Science”

Older people's hair becomes less shiny because it gets more uneven and curved.

research Characterization of Curved Hair of Japanese Women with Reference to Internal Structures and Amino Acid Composition

July 2009 in “International Journal of Cosmetic Science”

Japanese women's curved hair has an uneven internal structure and varied amino acid composition.

research Cortical Cell Types and Intermediate Filament Arrangements Correlate with Fiber Curvature in Japanese Human Hair

62 citations, December 2008 in “Journal of structural biology”

Hair curvature in Japanese people is linked to specific cell types and filament arrangements in the hair cortex.

research Human Hair Keratin Network And Curvature

85 citations, October 2007 in “International Journal of Dermatology”

Curly hair shape is due to uneven growth patterns in the hair follicle.

research Characteristic Features of Japanese Women's Hair With Aging and Hair Loss

76 citations, December 2006 in “Journal of Dermatological Science”

Japanese women typically start experiencing hair loss after 40, with reduced hair density and thickness being the main factors.

research Hair Density, Hair Diameter, and the Prevalence of Female Pattern Hair Loss

234 citations, February 2001 in “British Journal of Dermatology”

FPHL affects hair density and diameter, causing visible hair loss in older women.

Characterization of Curved Hair of Japanese Women with Reference to Internal Structures and Amino Acid Composition

Research cited in this study

research Characterization of a First Domain of Human High Glycine-Tyrosine and High Sulfur Keratin-Associated Protein Genes on Chromosome 21q22.1

Related Community Posts Join

community My Last Post on this Subreddit: Nuclear Option

community hairloss in my 20s has ruined my life.

community 1 year fin 1mg and minox. can see some density reclaimed

community Long term finasteride users; Did you notice any improvement after 2 years?

community PSA: Most men who stay on Fin will see the sexual side effects go away. Stop the fear mongering

community Trying to understand finasteride side effects and post finasteride syndrome