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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 Regulation of Hard Alpha-Keratin Mechanics via Control of Intermediate Filament Hydration: Matrix Squeeze Revisited

30 citations , November 2012 in “Proceedings of the Royal Society B Biological Sciences”

Hard α-keratins stay stiff in water because the surrounding matrix keeps them dehydrated and strong.

research The Self-Recovery Phenomenon of Oxidized Hair

September 2013

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

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

41 citations , July 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 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 Considering giving a laser comb a shot. Here’s a summary of my research on the subject.

9 upvotes 9 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.

community Can hard water affect your scalp/hair?

in Chat 15 upvotes 4 years ago

Hard water may contribute to an itchy, dry scalp and hair issues, but it doesn't affect genetic hair loss. Some users suggest using distilled water or a water softener to alleviate symptoms.

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

in Research/Science 117 upvotes 2 years ago

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

community LLLT seems like it's at least a solid maintenance tool. Can also provide ok regrowth in AA and MPB. - Pubmed

16 upvotes 8 years ago

Low-Level Laser Therapy (LLLT) is seen as a safe and effective method for maintaining hair and promoting regrowth in androgenetic alopecia (AGA) and male pattern baldness (MPB), with devices like the HairMax LaserComb® and iRestore helmet being popular. Some users and professionals are skeptical about its long-term effectiveness and cost.

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

in Research/Science 70 upvotes 4 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.