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Different ethnic hair types have unique nanoscopic and molecular features despite having the same basic keratin structure.

Hair analysis can help diagnose cell ion channel activity and calcium deficiency.

Hair density is better measured by counting hairs over 40 microns thick.

UVF-dermoscopy is a useful tool for accurately diagnosing types of alopecia, especially in people with lighter skin.

Hair treatments like bleaching increase friction by exposing tiny pores on the hair surface.

A new method effectively stains hair samples for study without losing hair sections.

Confocal Raman microscopy can effectively study drug delivery in hair follicles using pig ear models.

Bleaching hair causes significant damage by breaking down proteins and fatty acids.

The method effectively analyzes human hair proteins, especially nonfilamentous ones.

A new method accurately measures lead levels in hair to assess exposure.

Whole hair strands can reliably measure gamma ray exposure using ESR techniques, but samples should be analyzed quickly or stored in liquid nitrogen.

Dermatologists help detect gender-based violence by identifying skin signs of abuse.

Hair fiber research combines multiple sciences to improve hair care products.

Special and immunohistochemical stains are not routinely needed for diagnosing hair disorders.

The method can measure multiple hormones in women's hair and may help identify hormone-related health issues.

Infrared thermography, especially with dermoscopy, improves accuracy in diagnosing active hair loss due to inflammation.

Raman spectroscopy could effectively guide skin cancer surgery by identifying tumor margins.

A new method helps identify and classify different types of hair casts.

UVFT helps diagnose hair and scalp diseases by showing different fluorescence patterns.

Confocal microscopy is better than scanning electron microscopy for studying hair in its natural state and understanding hair products' effects.

Pathologic tissues have more soluble proteins than normal tissues.

Combining dermoscopy and calcium fluorescent white staining improves diagnosis and treatment of hair fungal infections.

A new method can quickly and accurately detect illegal chemicals in hair loss products.

Hair fibers break by cuticle cell slipping, shape changing, cuticle fraying, and surface cracking when stretched under specific conditions.

Wait 4-5 weeks after drug use before hair testing and cut hair into three segments to confirm single drug exposure.

Hair root analysis can effectively detect somatic mosaicism in double cortex syndrome.

Environmental factors can greatly reduce drug levels in hair.

Fentanyl accumulates differently in hair from internal use compared to external exposure.

The conclusion is that substances can penetrate hair fibers through multiple pathways, including both the cell membrane complex and the non-keratinous parts.