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Kojima, T.; Yamada, H.; Isobe, M.; Yamamoto, T.; Takeuchi, M.; Aoki, D.; Matsushita, Y.; Fukushima, K. Compositional changes of human hair melanin resulting from bleach treatment investigated by nanoscale secondary ion mass spectrometry. Skin Res. Technol. 2014, 20, 416–421. [ Google Scholar] [ CrossRef] Olmert, Michael (1996). Milton's Teeth and Ovid's Umbrella: Curiouser & Curiouser Adventures in History, p. 53. Simon & Schuster, New York. ISBN 0-684-80164-7 It is substantiated by Iyengar's findings (1998) that UV light can enter into straight human hair roots (and thus into the body through the skin) via the hair shaft. Specifically, the results of that study suggest that this phenomenon resembles the passage of light through fiber optic tubes (which do not function as effectively when kinked or sharply curved or coiled). In this sense, when hominids (i.e. Homo erectus) were gradually losing their straight body hair and thereby exposing the initially pale skin underneath their fur to the sun, straight hair would have been an adaptive liability. By inverse logic, later, as humans traveled farther from Africa and/or the equator, straight hair may have (initially) evolved to aid the entry of UV light into the body during the transition from dark, UV-protected skin to paler skin. Tian, H.; Sparvero, L.J.; Blenkinsopp, P.; Amoscato, A.A.; Watkins, S.C.; Bayir, H.; Kagan, V.E.; Winograd, N. Secondary-ion mass spectrometry images cardiolipins and phosphatidylethanolamines at the subcellular level. Angew. Chem. Int. Ed. 2019, 58, 3156–3161. [ Google Scholar] [ CrossRef][ Green Version]

Salmela, S.; Vuori, E.; Kilpio, J.O. The effect of washing procedures on trace-element content of human-hair. Anal. Chim. Acta 1981, 125, 131–137. [ Google Scholar] [ CrossRef] We can’t talk about highlights without talking about pre-lightener. Every product in the Blondor portfolio will work for weaves, slices and every sectioning pattern we’ve described. However, some are better suited to certain coloring techniques, whether you’re sweeping on balayage, precisely painting highlights or mixing up a money-piece. Lorentz, K.O.; de Nolf, W.; Cotte, M.; Ioannou, G.; Foruzanfar, F.; Zaruri, M.R.; Sajjadi, S.M.S. Synchrotron radiation micro X-Ray Fluorescence (SR-μXRF) elemental mapping of ancient hair: Metals and health at 3rd millennium BCE Shahr-i Sokhta, Iran. J. Archaeol. Sci. 2020, 120, 105193. [ Google Scholar] [ CrossRef] Freinkel, R.K.; Woodley, D.T., eds. (15 March 2001). The Biology of the Skin. CRC Press. p.80. ISBN 9781850700067. How many hairs are on a human head in total and per square inch?". curlcentric.com . Retrieved 18 April 2022.Robbins, C.R. Chemical and Physical Behavior of Human Hair, 5th ed.; Springer: New York, NY, USA, 2012. [ Google Scholar]

Gupta, Ankush (27 April 2014). "Human Hair "Waste" and Its Utilization: Gaps and Possibilities". Journal of Waste Management. 2014: 1–17. doi: 10.1155/2014/498018. As long as new hair cells continue to grow in the hair bulb, the hair continues to grow longer. This growth phase is also called the anagen phase. At any point in time, about 90 percent of a person’s total amount of hair is in this growth phase. Gill, E.L.; Yost, R.A.; Vedam-Mai, V.; Garrett, T.J. Precast gelatin-based molds for tissue embedding compatible with mass spectrometry imaging. Anal. Chem. 2017, 89, 576–580. [ Google Scholar] [ CrossRef][ Green Version] Chen, R.; Hui, L.; Sturm, R.M.; Li, L. Three dimensional mapping of neuropeptides and lipids in crustacean brain by mass spectral imaging. J. Am. Soc. Mass Spectrom. 2009, 20, 1068–1077. [ Google Scholar] [ CrossRef] [ PubMed][ Green Version] Feughelman, Max (1997). Mechanical Properties and Structure of Alpha-keratin Fibres: Wool, Human Hair and Related Fibres. UNSW Press. ISBN 978-0-86840-359-5 . Retrieved 27 January 2016.Flinders, B.; Cuypers, E.; Zeijlemaker, H.; Tytgat, J.; Heeren, R.M. Preparation of longitudinal sections of hair samples for the analysis of cocaine by MALDI-MS/MS and TOF-SIMS imaging. Drug Test. Anal. 2015, 7, 859–865. [ Google Scholar] [ CrossRef] Nakanishi, T.; Nirasawa, T.; Takubo, T. Quantitative mass barcode-like image of nicotine in single longitudinally sliced hair sections from long-term smokers by matrix-assisted laser desorption time-of-flight mass spectrometry imaging. J. Anal. Toxicol. 2014, 38, 349–353. [ Google Scholar] [ CrossRef] [ PubMed][ Green Version] Whether it is straight or curly will depend on the cross-sectional shape of hair. Round hair grows straight out of the skin. The more oval-shaped the cross-section is, the curlier the hair will be. Vandevenne, M.; Vandenbussche, H.; Verstraete, A. Detection time of drugs of abuse in urine. Acta Clin. Belg. 2000, 55, 323–333. [ Google Scholar] [ CrossRef] [ PubMed] Teerink, BJ (2003). Hair of West European Mammals: Atlas and Identification Key. Cambridge University Press. p.224. ISBN 9780521545778.

The go-to styling tool for all occasions, the ghd comb range helps to create classic styles whatever length and type of hair you have. An essential in every hair enthusiast’s kit, a hair comb comes in handy for everything from sectioning to styling when creating your very own salon perfect styles. Sandel, Aaron A. (30 July 2013). "Brief communication: Hair density and body mass in mammals and the evolution of human hairlessness". American Journal of Physical Anthropology. 152 (1): 145–150. doi: 10.1002/ajpa.22333. hdl: 2027.42/99654. ISSN 0002-9483. a b c d e f g Sadan, J.; Reinhart, A.K.; Reinert, B. (1997). "SHA'R". In Bosworth, C.E.; van Donzel, E.; Heinrichs, W.P.; Lecomte, G. (eds.). The Encyclopaedia of Islam, Vol. IX (SAN-SZE) (PDF). Leiden: Brill. pp.311–3. ISBN 90-04-10422-4 . Retrieved 13 June 2022. Ghaste, M.; Mistrik, R.; Shulaev, V. Applications of Fourier Transform Ion Cyclotron Resonance (FT-ICR) and orbitrap based high resolution mass spectrometry in metabolomics and lipidomics. Int. J. Mol. Sci. 2016, 17, 816. [ Google Scholar] [ CrossRef]Poetzsch, M.; Baumgartner, M.R.; Steuer, A.E.; Kraemer, T. Segmental hair analysis for differentiation of tilidine intake from external contamination using LC-ESI-MS/MS and MALDI-MS/MS imaging. Drug Test. Anal. 2015, 7, 143–149. [ Google Scholar] [ CrossRef] a b c d Jablonski, Nina G. (1 May 2008). Skin: A Natural History. University of California Press. pp.13–. ISBN 978-0-520-94170-0 . Retrieved 27 January 2016. Krause, K; Foitzik, K (2006). "Biology of the Hair Follicle: The Basics". Seminars in Cutaneous Medicine and Surgery. 25 (1): 2–10. doi: 10.1016/j.sder.2006.01.002. PMID 16616298.

Depilation is the removal of hair from the surface of the skin. This can be achieved through methods such as shaving. Epilation is the removal of the entire hair strand, including the part of the hair that has not yet left the follicle. A popular way to epilate hair is through waxing. Wu, Dong-Dong; Irwin, David M. (2018), Plowman, Jeffrey E.; Harland, Duane P.; Deb-Choudhury, Santanu (eds.), "Evolution of Trichocyte Keratin Associated Proteins", The Hair Fibre: Proteins, Structure and Development, Advances in Experimental Medicine and Biology, Singapore: Springer, vol.1054, pp.47–56, doi: 10.1007/978-981-10-8195-8_5, ISBN 978-981-10-8195-8, PMID 29797267 , retrieved 4 March 2023 Borella, P.; Rovesti, S.; Caselgrandi, E.; Bargellini, A. Quality control in hair analysis: A systematic study on washing procedures for trace element determinations. MikroChim. Acta 1996, 123, 271–280. [ Google Scholar] [ CrossRef] Rowe, T. B.; Macrini, T. E.; Luo, Z.-X. (19 May 2011). "Fossil Evidence on Origin of the Mammalian Brain". Science. 332 (6032): 955–957. Bibcode: 2011Sci...332..955R. doi: 10.1126/science.1203117. PMID 21596988. S2CID 940501. Pandhi, D.; Khanna, D. (31 August 2013). "Premature graying of hair". Indian Journal of Dermatology, Venereology and Leprology. 79 (5): 641–653. doi: 10.4103/0378-6323.116733. PMID 23974581 . Retrieved 15 November 2017.For pin-straight, divide each layer into small sections. Glide the straightener only a few times over each section before moving along. [5] X Research source Harrison, W.W.; Yurachek, J.P.; Benson, C.A. Determination of trace elements in human hair by atomic absorption spectroscopy. Clin. Chim. Acta 1969, 23, 83–91. [ Google Scholar] [ CrossRef]