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  1. en.wikipedia.org › wiki › SunscreenSunscreen - Wikipedia

    Sunscreen. Sunscreen, also known as sunblock [a] or sun cream, is a photoprotective topical product for the skin that helps protect against sunburn and prevent skin cancer. Sunscreens come as lotions, sprays, gels, foams (such as an expanded foam lotion or whipped lotion [4] ), sticks, powders and other topical products.

  2. Drometrizole trisiloxane ( INCI) is a lipophilic benzotriazole derivative marketed as Mexoryl XL by L'Oréal and is used in sunscreens to absorb UV radiation. It is a broad-spectrum UV absorber with two absorption peaks, one at 303 nm (UVB) and one at 344 nm (UVA). Just like Mexoryl SX ( ecamsule ), it is used exclusively in products by L ...

  3. en.wikipedia.org › wiki › HairHair - Wikipedia

    • Overview
    • Description
    • Composition
    • Functions
    • Evolution
    • Disease
    • Hair Care
    • Social Role
    • References
    • External Links

    The word "hair" usually refers to two distinct structures: 1. the part beneath the skin, called the hair follicle, or, when pulled from the skin, the bulb or root. This organ is located in the dermis and maintains stem cells, which not only re-grow the hair after it falls out, but also are recruited to regrow skin after a wound. 2. the hair shaft, ...

    Each strand of hair is made up of the medulla, cortex, and cuticle. The innermost region, the medulla, is an open and unstructured region which is not always present. The highly structural and organized cortex, or second of three layers of the hair, is the primary source of mechanical strength and water uptake. The cortex contains melanin, which co...

    Hair is mainly composed of keratin proteins and keratin-associated proteins (KRTAPs). The human genome encodes 54 different keratin proteins which are present in various amounts in hair. Similarly, humans encode more than 100 different KRTAPs which crosslink keratins in hair. The content of KRTAPs ranges from less than 3% in human hair to 30–40% in...

    Many mammals have fur and other hairs that serve different functions. Hair provides thermal regulation and camouflagefor many animals; for others it provides signals to other animals such as warnings, mating, or other communicative displays; and for some animals hair provides defensive functions and, rarely, even offensive protection. Hair also has...

    Hair has its origins in the common ancestor of mammals, the synapsids, about 300 million years ago. It is currently unknown at what stage the synapsids acquired mammalian characteristics such as body hair and mammary glands, as the fossils only rarely provide direct evidence for soft tissues. Skin impression of the belly and lower tail of a pelycos...

    Ringworm is a fungal diseasethat targets hairy skin. Premature greying of hairis another condition that results in greying before the age of 20 years in Europeans, before 25 years in Asians, and before 30 years in Africans.

    Hair care involves the hygiene and cosmetology of hair including hair on the scalp, facial hair (beard and moustache), pubic hairand other body hair. Hair care routines differ according to an individual's culture and the physical characteristics of one's hair. Hair may be colored, trimmed, shaved, plucked, or otherwise removed with treatments such ...

    Hair has great social significance for human beings. It can grow on most external areas of the human body, except on the palms of the hands and the soles of the feet (among other areas). Hair is most noticeable on most people in a small number of areas, which are also the ones that are most commonly trimmed, plucked, or shaved. These include the fa...

    Sources

    1. Iyengar, B. (1998). "The hair follicle is a specialized UV receptor in human skin?". Bio Signals Recep. 7 (3): 188–194. doi:10.1159/000014544 (inactive 28 May 2024). PMID 9672761. S2CID 46864921.{{cite journal}}: CS1 maint: DOI inactive as of May 2024 (link) 2. Jablonski, N.G. (2006). Skin: a natural history. Berkeley, CA: University of California Press. 3. Rogers, Alan R.; Iltis, David; Wooding, Stephen (2004). "Genetic variation at the MC1R locus and the time since loss of human body hai...

    Quotations related to Hairat Wikiquote
    The dictionary definition of hairat Wiktionary
    Instant insight outlining the chemistry of hair from the Royal Society of Chemistry
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