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. the discussion at the meeting was that the issue of GM crops has been settled.378 Mise a jour geant 5500 hd v 2.27
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. the Commission met in March and April. the Council had to withdraw its proposal.Fluorescence and polarized laser-induced fluorescence spectroscopy of methyl red.
We investigated the fluorescence and polarized laser-induced fluorescence (PLIF) spectra of methyl red (1,4-dimethyl-3,5-diphenylthieno[3,2-b]-1,4-dithiazine) and the depolarization phenomenon of the spectra of the dye in liquid solution in chloroform, in a carbon tetrachloride and in the glycerol-water mixture, using a nonpolarized and polarized Raman scattering spectrometer. The position of the fluorescence band in the PLIF spectrum of the methyl red-glycerol mixture (63 +/- 1%) is shifted relative to the Raman bands of the dye and the glycerol. The depolarized PLIF spectra of the methyl red-glycerol mixture in a carbon tetrachloride (87 +/- 1%) have the band at the same position as in the pure chloroform solution. The polarizability, measured by means of Raman scattering in the region of the fluorescence, is increased to 6-7%, as compared with the Raman-determined value of 3.5%, when the dye is dissolved in the glycerol-water mixture and 13% in the carbon tetrachloride. The shift of the fluorescence maximum position, and the increase of polarizability, can be explained by a shift of the dye polarity and/or a change in its structure in a polar environment.Listen to this article
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