December 2021 in “2021 International Conference on Electronic Information Technology and Smart Agriculture (ICEITSA)” This study found that chemical hair dyes caused more significant microstructural damage to hair than high-temperature perms, as observed using a single-detector OCT system.
August 1989 in “Proceedings ... annual meeting, Electron Microscopy Society of America/Proceedings, annual meeting, Electron Microscopy Society of America” This microscopy study examined the non-keratinous regions of human hair fibers, revealing detailed morphology that could help understand how external influences affect hair structure.
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January 2007 in “AIP conference proceedings” This study used phase contrast hard x-ray microscopy to capture detailed images of healthy human hair, revealing distinct structures such as the medulla, cortex, and cuticular layer.
September 1989 in “PubMed” This study reported detailed three-dimensional ultrastructural observations of human hair and hair follicles using a modified preparation method, including morphological differences in hair bulb cell layers and surface projections on root sheath cells.
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January 2010 in “Biological and medical physics series” This review discusses past research on the chemical and physical properties of human hair, focusing on structural analysis and mechanical property measurements with methods like SEM and tension tests, but adds no new findings.