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The erythematogenic and melanogenic properties of polychromatic long-wave ultraviolet light (UV-A) has been re-examined. Redness appeared immediately after exposure and persisted for 24 hr with doses of about 50 Joules/cm2. With threshold erythemal doses, about 13 J/cm2, the redness faded after a few minutes. The response was not biphasic. Pigmentation also appeared immediately after exposure and faded rapidly with threshold doses of 4 J/cm2. With larger doses (18 J/cm2) immediate pigmentation gave way without fading to delayed pigmentation (true melanogenesis). Thus, the acute effects of UV-A, unlike other wavelengths within the UV-spectrum, are immediate and appear without latency. The responses are also most intense immediately after exposure.
K H Kaidbey, and
A M Kligman
March 1990,
Seminars in dermatology,
K H Kaidbey, and
A M Kligman
August 1994,
Der Hautarzt; Zeitschrift fur Dermatologie, Venerologie, und verwandte Gebiete,
K H Kaidbey, and
A M Kligman
January 1947,
Strahlentherapie,
K H Kaidbey, and
A M Kligman
March 2004,
Toxicology and applied pharmacology,
K H Kaidbey, and
A M Kligman
January 1983,
Acta dermato-venereologica,
K H Kaidbey, and
A M Kligman
October 1989,
Photochemistry and photobiology,
K H Kaidbey, and
A M Kligman
April 1980,
Zeitschrift fur Hautkrankheiten,
K H Kaidbey, and
A M Kligman
July 1981,
Gigiena i sanitariia,
K H Kaidbey, and
A M Kligman
June 1983,
Australian dental journal,
K H Kaidbey, and
A M Kligman
August 1977,
The British journal of dermatology,
