action spectrum


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action spectrum

[′ak·shən ‚spek·trəm]
(physiology)
Graphic representation of the comparative effects of different wavelengths of light on living systems or their components.
References in periodicals archive ?
An action spectrum is the effectiveness of different wavelengths of light to cause a photobiological or photochemical action or reaction.
The spectral mismatch correction technique commonly used in photometry can be applied to UV broadband measurements where the photopic V([lambda]) function is replaced by a particular UV action spectrum.
1972), "The Merits of an Envelope Action Spectrum for Ultraviolet Radiation Exposure Criteria," American Industrial Hygiene Association Journal, 33:644-653.
The new human action spectrum now indicates that the longer UV-A exposures needed to create a tan would pose about the same cancer risk as a UV-B tanning dose.
The new human UV action spectrum also indicates that when it comes to a permanent thinning of Earth's ozone, each 1 percent drop in stratospheric ozone could increase the incidence of nonmelanoma skin cancers by 2 percent.
Eric Bornstein, said, "The granting of this patent further differentiates Nomir as a photobiology company, as the Noveon's unique action spectrum is proven safe, and is well beyond the mutagenic ultraviolet or photo-thermal ablative wavelengths and power ranges traditionally used for anti-infective indications.
Toward that progress, the German Institute for Standardization released a prestandard, DIN V 5031-100, defining an action spectrum for nocturnal melatonin suppression ([S.
An action spectrum for melatonin suppression: evidence for a novel non-rod, noncone photoreceptor system in humans.
Skene, An action spectrum for melatonin suppression: evidence for a novel non-rod, non-cone photoreceptor system in humans.
Vitamin D effective daily dose is the daily dose of UVR wavelengths relevant to the conversion of 7-dehydrocholesterol into previtamin D in the skin, based on the vitamin D action spectrum (MacLaughlin et al.

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