New PDF release: Analytical Chemistry Progress

By Robert B. Green (auth.)

ISBN-10: 3540135960

ISBN-13: 9783540135968

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G. highly reactive species like free radicals, may be produced in a secondary reaction. Typical photochemical reactions, which are important for biomolecules, too 14), are dissociation, ionization, dimerization or photoinduced isomerization (cf. Fig. 3). Thus, photodissociation of the sulphur bond has been observed in the amino acid cystine to be most likely the dominating photochemical reaction of proteins excited by UV-radiation. As the cystine-absorption is rather low in the UV, intramolecular energy transfer processes from other amino acids must be important for this reaction.

Highly reactive species like free radicals, may be produced in a secondary reaction. Typical photochemical reactions, which are important for biomolecules, too 14), are dissociation, ionization, dimerization or photoinduced isomerization (cf. Fig. 3). Thus, photodissociation of the sulphur bond has been observed in the amino acid cystine to be most likely the dominating photochemical reaction of proteins excited by UV-radiation. As the cystine-absorption is rather low in the UV, intramolecular energy transfer processes from other amino acids must be important for this reaction.

Chlorophyll concentration: 35 pg/ml at~ 30 Laser Spectroscopyof Biomolecules As all pigment molecules in the antennae can absorb the light energy there must be an efficient mechanism by which the energy is transferred without degradation to the reaction centre. g. 34)]. This excitation is suggested to be hopping randomly between neighbouring chlorophyll molecules ("random-walk-approach") and is usually referred to as exciton migration 29,35,82). A general definition of a "biological exciton" is given by Knox 36).

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Analytical Chemistry Progress by Robert B. Green (auth.)


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