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Hard α-keratin has a universal molecular structure with a specific superlattice arrangement.

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

Hair has unevenly distributed proteins and lipids, with lipids mainly in the cuticle and proteins in the cortex and medulla.

Skin changes can indicate a risk for breast cancer.

Hair structure forms the same way inside and outside the body.

A specific hair diffraction pattern may indicate breast cancer if tested with the correct method.

Human hair varies widely and should be classified by curl type rather than race.

Breast cancer alters specific molecular structures in hair, which revert after cancer removal.

Changes in keratin make hair follicles stiffer.

Breast cancer may be detectable through changes in scalp hair lipids.

Mummy hair's chemical composition may not accurately show ancient people's health due to environmental contamination.

Human hair keratin fibers have a detailed nano-scale structure that changes with different conditions.

Perming significantly changes hair's molecular structure, while shampoo and conditioner do not.

Human hair has a new region with ordered filaments and the cuticle contains β-keratin sheets.

Lead can help reveal and organize lipids in human hair.

Yak belly hair has higher porosity and is less stiff than human hair, making it absorb dye better but less suitable as a direct substitute for hair dyeing.

Hair stiffness is higher when it has more para-like cortical cells.

Curly hair breaks more easily, especially with chemical treatments, but simpler grooming reduces breakage.

The study developed a method to analyze ancient hair proteins using very small samples.

Nanoemulsions can effectively deliver antiseptic agents deep into the skin.

L-PGDS has specific binding sites for its functions and could help in drug delivery system design.

The skin is a complex barrier for drug penetration, but understanding its structure and interactions can improve drug delivery methods.

The research found two types of calcium in human hair, one that varies among individuals and another that is consistent across people.

Hair analysis is better than urine and blood for detecting past drug use.

Human hair shows promise for non-invasive medical testing, but more research is needed to standardize its use.

Polarized microscopy helps identify hair irregularities in genetic disorders.

Hair analysis may help detect breast cancer early by identifying changes in lipid content.

Hair lipids do not protect against humidity.

Hair follicles form hard α-keratin filaments in four steps, showing structural differences.

Surfactants in shampoos and conditioners remove some but not all lipids from hair, and more research is needed to understand their full impact.