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Fluorescence quenching description

Figure S.6. Schematic representation of So and Si energy profiles for DEWAR formation in TB9A and TB9ACN. 2 The excited state funnel F is very close to the ground stale surface and therefore leads to fluorescence quenching (identifiable with rate constant k). Most of the molecules return to the anthracene form via pathway a, while only a few proceed to the Dewar form (pathway b), because F is placed to the left of the ground state barrier. The steric effect of the tert-butyl substituent is indicated by the broken line. Without this prefolding" of the anthracence form. Dewar formation is not observed. The top part of the figure contains a schematic description of the butterfly-type folding process, while the bottom part contains examples of actual molecules. Figure S.6. Schematic representation of So and Si energy profiles for DEWAR formation in TB9A and TB9ACN. 2 The excited state funnel F is very close to the ground stale surface and therefore leads to fluorescence quenching (identifiable with rate constant k). Most of the molecules return to the anthracene form via pathway a, while only a few proceed to the Dewar form (pathway b), because F is placed to the left of the ground state barrier. The steric effect of the tert-butyl substituent is indicated by the broken line. Without this prefolding" of the anthracence form. Dewar formation is not observed. The top part of the figure contains a schematic description of the butterfly-type folding process, while the bottom part contains examples of actual molecules.
R. Ranganathan, C. Vautier-Giongo, B. L. Bales, Toward a hydrodynamic description of bimolecular collisions in micelles. An experimental test of the effect of the nature of the quencher on the fluorescence quenching of pyrene in SDS micelles and in bulk liquids, J. Phys. Chem. B, 2003, 107, 10312-10318. [Pg.450]

Once phage or scFv which specifically bind the antigen of interest have been identified it may be necessary to cany out further screening tests to assess which antibodies fiom the positive population have the highest affinities. There are a variety of wtq of achieving this including surface plasmon resonance (BlAcore) screening, fluorescence quench measmement, and competition ELISAs. Descriptions of these protocols are beyond the scope of this chapter. [Pg.87]

Structure on hydrogel properties of 2-hydroxyethyl acrylate determined. " Polymers bearing tertiary amino groups have been synthesised and their fluorescence spectra found to be significantly quenched while maleic anhydride " and cyclododecanones have been found to be effective initiators of the photopolymerisation of styrene. Poly(methylphenylsilane) is also an effective photoinitiator for styrenes and acrylates via a photolytic process to give silyl radicals. Iron oxalate is also an effective photo initiator for acrylate monomers while a theoretical description of the kinetics of free radical dye-initiated polymerisation via an electron transfer process has been proposed. Using the Marcus theory it has been shown that the rate of electron transfer can affect the rate of initiation. [Pg.359]

When the fluorescence from a DPA-labeled PSS sample was quenched with T1+, deviation from Stem-Volmer behavior was observed [146]. A measure of success was achieved in description of the data, however, through use of the Hindered Access Model [1] (see Equation 2.13). This complex behavior was considered to reflect the fact that quenching can occur via Tl+ ions which are condensed onto the polyelectrolyte in addition to deactivation by those ions which diffuse through solution. The data were also consistent with an extended PSS conformation in the presence of low concentrations of salt, which is in agreement with other fluorescence data [87,145,150] and light scattering and viscosity measurements [136-139]. [Pg.75]

Photosynthesis provides another source of stimulation for investigations in photophysics. The photochemistry of manganese prophyrins have been investigated because of their relevance to photosystem II.Related to this are the studies on the quenching of fluorescence of tetraphenylporphine. Freed has given a quantum mechanical description of the radiative and non-radiative characteristics of the lowest singlet states in chlorophyll hydrated dimers. [Pg.91]

The second case firom which dynamic information can be recovered is also the more general description of the model. The quencher is assumed to be mobile and the dissociation rate constant of the quencher from the supramolecu-lar system ( g ) competes with the quenching process The mechanistic scheme of Fig. 1 is valid taking into account the general assumptions mentioned above. The fluorescence decay can be described by a function with four parameters [60,97] ... [Pg.406]


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See also in sourсe #XX -- [ Pg.86 ]




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Fluorescent quenching

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