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GlossaryYoung's modulus (Tensile modulus)

measures material stiffness by stress-to-strain ratio in elasticity

Young's modulus, also known as the elastic modulus, is a measure of the stiffness of a material. It quantifies how much a material will deform under a given amount of stress. Specifically, it is the ratio of tensile stress (force per unit area) to tensile strain (proportional deformation) in the linear elasticity region of the material. This property is crucial in fields like materials science and engineering, as it helps predict how materials will behave under different forces.

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research Effect of Equilibrium pH on the Structure and Properties of Bleach-Damaged Human Hair Fibers

10 citations, September 2020 in “Biopolymers”

Hair's structure and properties change with pH; acidic pH maintains strength and less swelling, while alkaline pH increases water content and swelling.

research The Self-Recovery Phenomenon of Oxidized Hair

September 2013

Oxidized hair can naturally regain strength and stability over six months.

research Effect of Varied Hair Protein Fractions on the Gel Properties of Keratin/Chitosan Hydrogels for Use in Tissue Engineering

41 citations, November 2020 in “Colloids and surfaces. B, Biointerfaces”

Different hair protein amounts change the strength of keratin/chitosan gels, useful for making predictable tissue engineering materials.

research Effect of Scalp Position on Tensile Properties of Single Hair Fibers

5 citations, January 2018 in “International Journal of Trichology”

Hair strength is similar across different scalp areas, and not affected by age, gender, or hair thickness.

research Skin Aging as a Mechanical Phenomenon: The Main Weak Links

41 citations, May 2018 in “Nutrition and healthy aging”

Skin aging is largely due to differences in stiffness and elasticity between skin layers, leading to wrinkles.

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community 0.5mg Dutasteride promotes more “regrowth” than 5mg oral Minoxidil

in Research/Science 117 upvotes 9 months ago

Dutasteride promotes more hair regrowth than Minoxidil. Users discuss combining treatments for better results and share personal experiences with side effects.

community Why I really believe the tension theory is the cause of MPB

in Research/Science 70 upvotes 3 years ago

The conversation discusses the tension theory as a cause of male pattern baldness (MPB), suggesting that scalp tension and reduced subcutaneous fat layer contribute to hair loss. Treatments mentioned include Minoxidil, finasteride, microneedling, scalp massages, and Botox.

community Considering giving a laser comb a shot. Here’s a summary of my research on the subject.

9 upvotes 8 years ago

Considering adding Low Level Laser Therapy (LLLT) to a hair loss prevention regimen; discussing the effectiveness of LLLT, and evaluating double-blind random-controlled trials that have been conducted on laser combs.