action spectrum


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Fig. 9 Action spectrum . The absorption and action spectra of chlorophyll.

action spectrum

a range of wavelengths of light within which a physiological process can take place. For example, the range of wavelengths of light in which the chlorophyll in green plants is able to synthesize carbohydrates by photosynthesis corresponds closely to the ABSORPTION SPECTRUM, showing that most of the light absorbed by chlorophyll is actually used in photosynthesis. See Fig. 9 .
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A reference action spectrum for ultraviolet induced erythema in human skin.
Action spectrum conversion factors that change erythemally weighted to previtamin [D.
In the following, we discuss common sources of error in UV radiation measurements, including out-of-band contributions to the signal, non-ideal geometric properties (non-ideal cosine response in the meters), and poor matching to a defined action spectrum.
Moreover, the researchers found that the absorption spectrum of the smallest particles matched the action spectrum of unsorted eumelanin.
Because knowledge about the action spectrum for the induction of melanoma is limited, a risk analysis for this condition could not be conducted.
The action spectrum for plankton death is similar to that for sunburning in humans, so the program can indicate the killing UV flux with and without the ozone hole.
The mechanism of skin injury has been closely co-related to the phenomenon that the action spectrum for UVB erythema has been found to be close to the absorption spectrum for DNA after adjusting for the absorbance of incident energy by the stratum corneum.
So he and Van der Leun fine-tuned data on UV's skin carcinogenicity -- its action spectrum -- in this mouse to account for the longer path UV rays must traverse through human skin.

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