• ACTION SPECTRUM (noun) The noun ACTION SPECTRUM has 1 sense:. The Action Spectrum for Bilirubin Phototherapy. Look it up now! The action spectrum of a light-driven process is a measure of its efficacy as a function of the wavelength of the light. noun Biology . It shows which wavelength of light is most effectively used in a specific chemical reaction. means the erythema action spectrum set out in section 5.2 of the International Com mission on Illumination Standard ISO 17166:1999(E) / CIE S 007/E-1998, First edition, entitled Erythema reference action spectrum and standard erythema dose, as amended from time to time. This file is translated using SVG elements. action spectrum A graph that depicts the relative effectiveness of different wavelengths of radiation in driving a particular process. between two extreme points: He has support from across the whole political spectrum. Subjects (37 females, 35 males, mean age of 24.5 ± 0.3 years) were … Absorption spectrum definition, the spectrum formed by electromagnetic radiation that has passed through a medium in which radiation of certain frequencies is absorbed. The measurements were made to provide a basis for discussion of the definition of "photo- synthetically active radiation". An action spectrum is a plot that represents the effectiveness of different wavelengths of light absorbed by different pigments in photosynthesis. An action spectrum is the rate of a physiological activity plotted against wavelength of light. 1. the efficiency with which electromagnetic radiation produces a photochemical reaction plotted as a function of the wavelength of the radiation Familiarity information: ACTION SPECTRUM used as a noun is very rare. An action spectrum is the rate of a physiological activity plotted against wavelength of light.It shows which wavelength of light is most effectively used in a specific chemical reaction.Some reactants are able to use specific wavelengths of light more effectively to complete their reactions. An action spectrum defines the spectrum of electromagnetic radiation most effective for photosynthesis. MeteoroL, 9: 191-216. action spectrum synonyms, action spectrum pronunciation, action spectrum translation, English dictionary definition of action spectrum. Some reactants are able to use specific wavelengths of light more effectively to complete their reactions. Find out information about action spectrum. (1) See more. Please tell us where you read or heard it (including the quote, if possible). spectrum noun [C] (RANGE) C1 a range of different positions, opinions, etc. But why do pigments matter to photosynthesis? An action spectrum is the rate of a physiological activity plotted against wavelength of light. Meaning and definition of action spectrum : A profile of the relative performance of different wavelengths of light. A graphical representation of the effectiveness of a range of electromagnetic wavelengths in producing a given biochemical or physiological response in an organism. Learn More about a broad spectrum Share a broad spectrum Dictionary Entries near a broad spectrum As these activities are identified, they lead to interrelated actions at other levels of the Spectrum. Start your free trial today and get unlimited access to America's largest dictionary, with: “Action spectrum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/action%20spectrum. Delivered to your inbox! Spectrum definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. In other words, it is the part of the light spectrum that does the work. Some reactants are able to use specific wavelengths of light more effectively to complete their reactions. The Spectrum identifies six levels of intervention (see image below) and helps people move beyond the perception that prevention is merely education. Action spectrum and absorption spectrum trend Both chlorophyll spectra overlap each other, illustrating that chlorophyll is the most essential pigment Wavelength for photosynthesis In 1881, the German plant physiologist T. W. Engelmann placed a filamentous green alga under the microscope and illuminated it with a tiny spectrum of visible light. 'All Intensive Purposes' or 'All Intents and Purposes'? The action spectrum is what is most important in plant growth and metabolism. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! 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