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Absorbance spectra of free chlorophyll a (blue) and b (red) in a solvent. The action spectra of chlorophyll molecules are slightly modified in vivo depending on specific pigment-protein interactions. An action spectrum is a graph of the rate of biological effectiveness plotted against wavelength of light. [1]
This mismatch between absorption spectra and photochemical action plots has by now been observed in a wide array of photoreactive systems. [41] [42] [43] A prominent example is the photoinduced [2+2] cycloaddition of the stilbene derivative, styrypyrene, which exhibited an 80 nm discrepancy between the action plot and absorption spectrum. [33]
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It is based on 'spectrum graph' method and contains different scoring functions, and can be comparable on the running time and accuracy to "the popular state-of-the-art programs" PepNovo and NovoHMM. Grossmann et al. [ 32 ] presented AUDENS in 2005 as an automated de novo peptide sequencing tool containing a preprocessing module that can ...
If the birefringence is known, then the thickness, t, of the sample can be determined; If the thickness is known, then the birefringence of the sample can be determined; As the order of the optical path difference increases, then it is more likely that more wavelengths of light will be removed from the spectrum.
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In the mathematical field of spectral graph theory, a Ramanujan graph is a regular graph whose spectral gap is almost as large as possible (see extremal graph theory). Such graphs are excellent spectral expanders .
Spectrum analysis, also referred to as frequency domain analysis or spectral density estimation, is the technical process of decomposing a complex signal into simpler parts. As described above, many physical processes are best described as a sum of many individual frequency components.