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Used medically as protectant against externally caused irritation and sunlight; high concentrations of dust may cause irritation to respiratory tract.
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That portion of the electromagnetic spectrum immediately below the visible range and
extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays)
are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal,
bactericidal, mutagenic, and carcinogenic and are used as disinfectants.
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Pharmacologic Action
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Sunscreening Agent
(Chemical or physical agents that protect the skin from sunburn and erythema by absorbing or blocking ultraviolet radiation.)
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Photosensitizing Agent
(Drugs that are pharmacologically inactive but when exposed to ultraviolet radiation
or sunlight are converted to their active metabolite to produce a beneficial reaction
affecting the diseased tissue. These compounds can be administered topically or systemically
and have been used therapeutically to treat psoriasis and various types of neoplasms.)
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Sunburn
An injury to the skin causing erythema, tenderness, and sometimes blistering and resulting from excessive exposure to the sun. The reaction is produced by the ultraviolet radiation in sunlight.
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Sunstroke
A condition produced by exposure to the sun, and marked by convulsions, coma, and a high
temperature of the skin. It is distinguished from heat stroke which is caused by excessive
heat, natural or artificial,
and is marked by dry skin, vertigo, headache, thirst, nausea and muscular cramps.
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