34 citations
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October 1982 in “Journal of applied polymer science” This study found that the moisture content of human hair significantly influences the type of fracture under tensile loading, with low or high humidity levels leading to smooth fractures and intermediate humidity resulting in step fractures.
52 citations
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April 2002 in “Brain Research” This study found that in rats, finasteride significantly reduced allopregnanolone in the cortex and increased both the rise and duration of dopamine levels in the prefrontal cortex in response to stress and anxiogenic stimuli.
March 2005 in “Journal of the American Academy of Dermatology” This study found that reintroducing certain depleted amino acids into weathered hair using cosmetic treatments can strengthen the hair, improving its look and feel and reducing damage and breakage.
17 citations
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June 2012 in “Journal of experimental zoology. Part B, Molecular and developmental evolution” This review explores theories on the evolution of hair from synapsid scales and glands, proposing mechanisms supported by comparative studies, but reports no new experimental findings.
This study reports that hair samples can be used to track chronic hormone levels, revealing stress, reproductive, and sodium regulation patterns in wildebeest related to environmental factors.