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Mammalian hair scales change from smooth to wavy due to friction.

This study found that permanent waving treatment partially disrupts the α-helical structure in human hair microfibrils, primarily during the initial reduction phase, rather than just affecting disulphide bonds.

This study found that by using an automated system to analyze skin histology, 108 structural features were significantly affected by age, and it identified four new aging biomarkers and notable sex-based differences in skin aging.

In this study, treating hair with thioglycolic acid was found to alter disulfide bond patterns in keratin-associated proteins, shifting them from an ellipsoidal to a near-spherical shape.

This study observed that the molecular structure of keratins in hair fibres' discrete transition zone differs in breast cancer patients, with altered lipid ester absorption bands reverting post-cancer removal.

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

In this study, researchers identified a three-step process underlying age-related curved hair from cyclical extension: surface lipid transfer, specific disulfide bond cleavage, and unraveling of α-helices into β-structures, which may inform care strategies to manage hair curvature.

This paper discusses various histologic features to distinguish types of alopecia and reports no new clinical findings.

This study examined prenatal and postnatal development of rat skin, observing marked changes in epidermal thickness and collagen fiber distribution as the rats aged.

In this study, researchers found that changes in the extracellular matrix components, particularly fibronectin, laminin, and type IV collagen, during the rat vibrissa follicle growth cycle, suggest dynamic remodeling related to dermal-epidermal signaling.

This study used 3D imaging to reveal age-related reductions in the volumes and connectivity of dermal papillae and rete ridges at the dermal-epidermal junction, which are not fully apparent in 2D examinations.

This study argues that the reported "toughening" transition in keratin is a misinterpretation, actually representing the evaporation peak of residual water in the fibers.

This study investigated the tensile response and morphological changes of different ethnic hair types using AFM, showing variations between virgin, chemically damaged, and conditioner-treated Caucasian hair under different conditions.

Chemotherapy can cause significant hair thinning and changes in hair texture, while tamoxifen has a smaller effect.

This study found that as Japanese women age, their hair cuticle becomes more prone to damage, shifting from type L to type E damage patterns, and hair surface properties, including fatty acid content, deteriorate.

In this study, high-resolution ultrasound imaging revealed that DHT administration in male C57BL/6 mice leads to increased epidermal and dermal thicknesses and decreased skin elasticity, simulating structural changes associated with Androgenetic Alopecia.

This discussion of age-related changes in female scalp hair follicles reports no new results, highlighting the structural transformations that may contribute to thinning hair in women as they age.

This study found that hair coloring, waving, and ironing were associated with increased hair abnormalities compared to untreated hair in Iranian women.

This study observed that ultrastructural changes like lamellar bodies and electron-dense granules in the stratum corneum may aid in the early diagnosis of Netherton syndrome.

This study observed that patients with different types of alopecia exhibited variable epidermal thickness and consistent dermal changes, including hair follicle destruction and lymphohistiocytic infiltrates, which may suggest inflammation.

This study found that the moisture content of human hair significantly influences the type of fracture under tensile loading, with low or high humidity levels leading to smooth fractures and intermediate humidity resulting in step fractures.

This study found that age-related hair thinning in Caucasian women over 50 involves significant structural changes within the hair follicle, suggesting an "aged hair program" rather than just producing thinner hairs.

This summary explains the different types of wrinkles, their causes, and their distinct microanatomical characteristics, noting that each type may respond differently to treatments.

This study reports that prolonged UV irradiation causes progressive damage to the hair's keratin structure, leading to increased surface roughness, cuticle destruction, and decreased tensile strength in young women’s hair.

This study found that mesenchymal cell processes from the dermal papilla contact epithelial hair matrix cells through gaps in the basal lamina during hair matrix cell differentiation in mouse vibrissa follicles.

In this study, researchers found that patients with non-scar alopecia exhibited thinner hair sacs and root sheaths compared to a control group, with significant thinning observed in cases of alopecia areata.

In this study, chemical treatments during permanent hair straightening were found to randomize proteins in the cortex, aiding in the reconnection of disulfide bonds during oxidation.

This study observed that hair fibers in older women become more curved with age, decreasing hair luster due to their disordered alignment and structural differences between the convex and concave sides.

This study found that excess vitamin A in organ cultures of mouse embryos led to significant changes in epidermis and hair follicles, altering morphogenesis and polysaccharide distribution.

In this study, dermatological changes were highly prevalent among postmenopausal women, with xerosis, pigmentary changes, and hair thinning being the most common findings, suggesting such changes are often overlooked in clinical practice.