... action spectrum - the efficiency with which electromagnetic radiation produces a photochemical reaction plotted … [[File:Erythemal action spectrum.svg|lang=en]] for the English version.. To translate this file into your language, you can use the SVG Translate tool. Delivered to your inbox! Define erythema reference action spectrum. The Action Spectrum for Bilirubin Phototherapy. Photosynthetic pigments absorb light only in the visible region of the spectrum (390nm-760nm).The action spectrum peak of chlorophyll is almost same as that of absorption spectrum indicating that chlorophyll is the primary pigment in photosynthesis. spectrum noun [C] (RANGE) C1 a range of different positions, opinions, etc. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. The Spectrum identifies six levels of intervention (see image below) and helps people move beyond the perception that prevention is merely education. 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. The rate of photosynthesis in an action spectrum can find out by measuring the amount of oxygen production, carbon dioxide fixation, and NADP+ reduction, etc. He's making a quiz, and checking it twice... Test your knowledge of the words of the year. In the medium surrounding the strands were motile, aerobic bacteria. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Origin. It means chlorophyll a forms the reaction centre. • ACTION SPECTRUM (noun) The noun ACTION SPECTRUM has 1 sense:. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! 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. spectrum [spek´trum] (L.) 1. the series of images resulting from the refraction of electromagnetic radiation (e.g., light, x-rays) and their arrangement according to frequency or wavelength. Spectrum definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. The definition of the action spectrum of the different drugs forms the basis for a defect-specific compensation strategy and a future personalized therapeutic approach. And couldn't trees have some other color of pigment to do the same thing? The action spectrum of a light-driven process is a measure of its efficacy as a function of the wavelength of the light. This file is translated using SVG elements. The aim of this study was to establish an action spectrum for light-induced melatonin suppression that could help elucidate the ocular photoreceptor system for regulating the human pineal gland. What made you want to look up action spectrum? 2. range of activity, as of an antibiotic, or of manifestations, as of a disease. Find out information about action spectrum. (spectre d’action érythémale de référence) An action spectrum is the rate of a physiological activity plotted against wavelength of light. See more. It doesnât require balancing a ball on your nose. The action spectrum, absorptance and quantum yield of photosynthesis in crop plants. 24 The measure of efficacy might be, for example, the rate of formation of a photochemical product for a given irradiance. In other words, it is the part of the light spectrum that does the work. An action spectrum is the rate of a physiological activity plotted against wavelength of light. The action spectrum of a light-driven process is a measure of its efficacy as a function of the wavelength of the light. 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. trums 1. action spectrum A graphical plot of the efficiency of electromagnetic radiation in producing a photochemical reaction against the wavelength of the radiation used. An action spectrum is a plot that represents the effectiveness of different wavelengths of light absorbed by different pigments in photosynthesis. 24 The measure of efficacy might be, for example, the rate of formation of a photochemical product for a given irradiance. McC'~E, K. J., 1972. As these activities are identified, they lead to interrelated actions at other levels of the Spectrum. action spectrum A graph that depicts the relative effectiveness of different wavelengths of radiation in driving a particular process. But why do pigments matter to photosynthesis? Learn more.. To embed this file in your language (if available) use the lang parameter with the appropriate language code, e.g. It shows which wavelength of light is most effectively used in a specific chemical reaction. Subjects (37 females, 35 males, mean age of 24.5 ± 0.3 years) were … At each level, the most important activities related to prevention objectives are identified. Learn More about a broad spectrum Share a broad spectrum Dictionary Entries near a broad spectrum Some reactants are able to use specific wavelengths of light more effectively to complete their reactions. The action spectrum is what is most important in plant growth and metabolism. Dictionary entry overview: What does action spectrum mean? 'All Intensive Purposes' or 'All Intents and Purposes'? It shows which wavelength of light is most effectively used in a specific chemical reaction. Looking for action spectrum? Look it up now! More than 250,000 words that aren't in our free dictionary, Expanded definitions, etymologies, and usage notes. action spectrum synonyms, action spectrum pronunciation, action spectrum translation, English dictionary definition of action spectrum. Can you spell these 10 commonly misspelled words? An action spectrum defines the spectrum of electromagnetic radiation most effective for photosynthesis. Please tell us where you read or heard it (including the quote, if possible). The action spectrum indicates the overall rate of photosynthesis at each wavelength of light There is a strong correlation between the cumulative absorption spectra of all pigments and the action spectrum Both display two main peaks – a larger peak at the blue region (~450 nm) and a smaller peak at the red region (~670 nm) Accessed 1 Jan. 2021. Comparison of absorption spectrum and action spectrum Absorption spectrum is given by all the pigments (Chl a. b, carotene and xanthophylls). The measurements were made to provide a basis for discussion of the definition of "photo- synthetically active radiation". Agrie. 1930s; earliest use … Action spectrum definition is - a graphic representation of a physiological reaction; specifically : physiological activity plotted against light wavelength. 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