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The technique showed that human hair has two main parts, with 68% being rigid and the rest flexible, and water swelling affects its structure.

The new X-ray technique allows for precise and non-destructive measurement of elements in hair, creating the first database of its kind for a specific ethnic group.

The conclusion is that new methods for isolating hair cuticle cells and removing the cuticle layer are effective and convenient.

Human hair's strength and flexibility vary by ethnicity, damage, and treatment.

AFM helped show how hair changes under tension and the effects of damage and conditioner.

Hair keratin-associated proteins are essential for strong hair, with over 80 genes showing specific patterns and variations among people.

Future hair cosmetics will be safer and more effective.

The article concludes that developing in vitro models for human hair structures is important for research and reducing animal testing, but there are challenges like obtaining suitable samples and the models' limitations.

Different populations have distinct hair structures related to their ancestry.

Quantifying hair shape is better than using racial categories for understanding hair characteristics.

Acidic sandy clay damages archaeological hair the most, while dry conditions preserve but make it brittle; silicone oil can help keep the hair flexible.

Aging makes hair thinner and rougher, with less clear edges.

Hair fibers have fractal patterns with properties related to the golden mean, which may affect their functionality.

Researchers developed a method to grow human hair follicles using 3D-printed skin models and modified cells.

Encapsulated human hair cells can substitute for natural hair cells to grow hair.

Understanding hair biology is key to developing better treatments for hair and scalp issues.

L-phenylalanine and hydrolyzed eggwhite protein deeply penetrate human hair.

Small amounts of DNA can be found in the hair shaft, especially near the root, but it decreases with hair treatments and washing.

Gray hair affects hair's movement and appearance, making it less bouncy and more wavy.

Polydopamine is a safe, effective, and permanent hair dye that turns gray hair black in one hour.

Hair fibers interact through classical forces, which are influenced by treatments and products, important for hair care and other applications.

The study found that variations in hair protein genes are likely due to evolutionary deletions or duplications.

Removing external lipids from hair reduces moisture and increases strength, while removing internal lipids decreases water permeability.

Holes in mature hair are likely caused by the removal of substances during hair care.

Frequent blow-drying causes cracks and breakage in hair cuticles.

UV radiation significantly damages hair, especially with humidity, making it more vulnerable to further damage.

Runx1 helps control the KAP5 gene in human hair follicles.

The document concludes that understanding how cells in the hair follicle grow and change is important for regulating hair growth.

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

The method can help diagnose and monitor diabetes by analyzing hair.