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Fitzpatrick Scale
The Fitzpatrick scale (also Fitzpatrick skin typing test; or Fitzpatrick phototyping scale) is a numerical classification schema for human skin color. It was developed in 1975 by American dermatologist Thomas B. Fitzpatrick as a way to estimate the response of different types of skin to ultraviolet (UV) light.Fitzpatrick, T. B. (1975). "Soleil et peau" un and skin ''Journal de Médecine Esthétique'' (in French) (2): 33–34 It was initially developed on the basis of skin color to measure the correct dose of UVA for PUVA therapy, and when the initial testing based only on hair and eye colour resulted in too high UVA doses for some, it was altered to be based on the patient's reports of how their skin responds to the sun; it was also extended to a wider range of skin types.Pathak, M. A.; Jimbow, K.; Szabo, G.; Fitzpatrick, T. B. (1976). "Sunlight and melanin pigmentation". In Smith, K. C. (ed.): ''Photochemical and photobiological reviews'', Plenum Press, New York. pp. 211–39Fitz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Influence Of Pigmentation On Skin Cancer Risk
Influence or influencer may refer to: *Social influence, in social psychology, influence in interpersonal relationships **Minority influence, when the minority affect the behavior or beliefs of the majority *Influencer marketing, through individuals that have influence over potential buyers Science and technology *Sphere of influence (astrodynamics), the region around a celestial body in which it is the primary gravitational influence on orbiting objects *Sphere of influence (black hole), a region around a black hole in which the gravity of the black hole dominates that of the host galaxy's bulge Politics *Undue influence, in contract law, where one person takes advantage of a position of power over another person *Sphere of influence, in political science, an area over which a state or organization has some indirect control *Agent of influence, an agent of some stature who uses his or her position to influence public opinion or decision making to produce results beneficial to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Skin Color
Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among individuals is caused by variation in pigmentation, which is the result of genetics (inherited from one's biological parents and or individual gene alleles), exposure to the sun, natural and sexual selection, or all of these. Differences across populations evolved through natural or sexual selection, because of social norms and differences in environment, as well as regulations of the biochemical effects of ultraviolet radiation penetrating the skin. The actual skin color of different humans is affected by many substances, although the single most important substance is the pigment melanin. Melanin is produced within the skin in cells called melanocytes and it is the main determinant of the skin color of darker-skin humans. The skin color of people with light skin is determined mainly by the bluish-white connective tissue under the dermis and by the hemoglobin circulating in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas B
Thomas Browne Henry (November 7, 1907 – June 30, 1980) was an American character actor known for many guest appearances on television and in films. He was active with the Pasadena Community Playhouse and was the older brother of actor William Henry. Selected filmography * ''Hollow Triumph'' (1948) - Rocky Stansyck (uncredited) * '' Behind Locked Doors'' (1948) - Dr. Clifford Porter * ''Sealed Verdict'' (1948) - Briefing JAG colonel * ''Joan of Arc'' (1948) - Captain Raoul de Gaucort * ''He Walked by Night'' (1948) - Dunning (uncredited) * ''Impact'' (1949) - Walter's Business Assistant (uncredited) * ''Tulsa'' (1949) - Mr. Winslow (uncredited) * ''Johnny Allegro'' (1949) - Frank (uncredited) * ''House of Strangers'' (1949) - Judge (uncredited) * '' Special Agent'' (1949) - Detective Benton (uncredited) * '' Flaming Fury'' (1949) - Robert J. McManus (uncredited) * '' Post Office Investigator'' (1949) - Lt. Contreras * '' Bagdad'' (1949) - Elder (uncredited) * '' Underto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultraviolet
Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nanometer, nm (with a corresponding frequency around 30 Hertz, PHz) to 400 nm (750 Hertz, THz), shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights. Although long-wavelength ultraviolet is not considered an ionizing radiation because its photons lack the energy to ionization, ionize atoms, it can cause chemical reactions and causes many substances to glow or fluorescence, fluoresce. Consequently, the chemical and biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules. Short-wave ultraviolet light damages DNA and sterilizes surf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultraviolet A
Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights. Although long-wavelength ultraviolet is not considered an ionizing radiation because its photons lack the energy to ionize atoms, it can cause chemical reactions and causes many substances to glow or fluoresce. Consequently, the chemical and biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules. Short-wave ultraviolet light damages DNA and sterilizes surfaces with which it comes into contact. For hum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PUVA Therapy
PUVA (psoralen and UVA) is an ultraviolet light therapy treatment for skin diseases: eczema, psoriasis, graft-versus-host disease, vitiligo, mycosis fungoides, large plaque parapsoriasis, and cutaneous T-cell lymphoma, using the sensitizing effects of the drug psoralen. The psoralen is applied or taken orally to sensitize the skin, then the skin is exposed to UVA. Photodynamic therapy is the general use of nontoxic light-sensitive compounds that are exposed selectively to light, whereupon they become toxic to targeted malignant and other diseased cells. Still, PUVA therapy is often classified as a separate technique from photodynamic therapy. Procedure Psoralens are materials that make the skin more sensitive to UV light. They are photosensitizing agents found in plants naturally and manufactured synthetically. Psoralens are taken as pills (systemically) or can be applied directly to the skin, by soaking the skin in a solution that contains the psoralens. They allow UVA energy to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Von Luschan's Chromatic Scale
Von Luschan's chromatic scale (VLS) is a method of classifying skin color. It is also called the von Luschan scale or von Luschan's scale. It is named after its inventor, Felix von Luschan. The equipment consists of 36 opaque glass tiles which were compared to the subject's skin, ideally in a place which would not be exposed to the sun (such as under the arm). The von Luschan scale was used to establish racial classifications of populations according to skin color; in this respect it is in contrast to the Fitzpatrick scale intended for the classification of the skin type of individuals introduced in 1975 by Harvard dermatologist Thomas B. Fitzpatrick to describe sun tanning behavior. The von Luschan scale was used extensively throughout the first half of the 20th century in race studies and anthropometry. However, the results were inconsistent: in many instances, different investigators would give different readings of the same person. The von Luschan scale was largely abando ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freckles
Freckles are clusters of concentrated melaninized cells which are most easily visible on people with a fair complexion. Freckles do not have an increased number of the melanin-producing cells, or melanocytes, but instead have melanocytes that overproduce melanin granules (melanosomes) changing the coloration of the outer skin cells (keratinocytes). As such, freckles are different from lentigines and moles, which are caused by accumulation of melanocytes in a small area. Freckles can appear on all types of skin tones. Of the six Fitzpatrick skin types, they are most common on skin tones 1 and 2, which usually belong to North Europeans. However, it can also be found on people all over the world. Biology The formation of freckles is caused by exposure to sunlight. The exposure to UV-B radiation activates melanocytes to increase melanin production, which can cause freckles to become darker and more visible. This means that one who has never developed freckles may develop them su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emoji
An emoji ( ; plural emoji or emojis) is a pictogram, logogram, ideogram or smiley embedded in text and used in electronic messages and web pages. The primary function of emoji is to fill in emotional cues otherwise missing from typed conversation. Examples of emoji are 😂, 😃, 🧘🏻♂️, 🌍, 🌦️, 🍞, 🚗, 📞, 🎉, ❤️, 🍆, 🍑 and 🏁. Emoji exist in various genres, including facial expressions, common objects, places and types of weather, and animals. They are much like emoticons, except emoji are pictures rather than typographic approximations; the term "emoji" in the strict sense refers to such pictures which can be represented as character encoding, encoded characters, but it is sometimes applied to Sticker (messaging), messaging stickers by extension. Originally meaning pictograph, the word ''emoji'' comes from Japanese + ; the resemblance to the English words ''emotion'' and ''emoticon'' is False cognate, purely coincidental. The I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skin Reflectance
In anthropology, reflectometry devices are often used to gauge human skin color Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among individuals is caused by variation in pigmentation, which is the result of genetics (inherited from one's biological parents and or individu ... through the measurement of skin reflectance. These devices are typically pointed at the upper arm or forehead, with the emitted waves then interpreted at various percentages. Lower frequencies represent lower skin reflectance and thus darker pigmentation, whereas higher frequencies represent greater skin reflectance and therefore lighter pigmentation. Below are global estimates of skin reflectance frequencies in various countries, populations and areas as observed and predicted by Jablonski and Chaplin. References {{reflist Skin pigmentation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brown Paper Bag Test
"The Brown Paper Bag Test" is a term in African-American oral history used to describe a colorist discriminatory practice within the African-American community in the 20th century, in which an individual's skin tone is compared to the color of a brown paper bag. The test was allegedly used to determine what privileges an individual could have; only those with a skin color that matched or was lighter than a brown paper bag were allowed admission or membership privileges. The test was believed by many to be used in the 20th century by many African-American social institutions such as sororities, fraternities, social clubs, and churches. The term is also used in reference to larger issues of class and social stratification and colorism within the African-American population. People were barred from having access to several public spaces and resources because of their darker complexion. The test was used at the entrance to social functions wherein a brown paper bag was stuck at the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
