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- W47472192 abstract "This introductory chapter describes, from a molecular perspective, the events that occur upon excitation of the chromophores of photoreceptors triggering photomovement (comprising phototaxis, photophobic responses and photokinesis in lower organisms as well as phototropism and photonasty in higher plants). A general description is given of the process of cis-trans isomerization and photoinduced electron transfer, and excursions are made into fundamental biophysical themes. Special attention is given to the influence of the medium (the protein moiety in the photoreceptors) on both the ground and excited state properties of the chromophores, and examples are offered of special cases. Furthermore, some photophysical properties of several photoreceptor chromophore models are compiled. The chromophores undergoing cis-trans isomerization are open-chain tetrapyrroles (present in phytochromes), para-hydroxycinnamoyl anion (in photoactive yellow protein) and retinal (in sensory rhodopsins in halobacteria and in some flagellate algae). Blue light photoreceptor chromophores such as flavins and the perylenquinone-type (e.g. hypericin-derivatives: stentorin and blepharismin) which most likely undergo electron transfer as the primary photochemical process are also discussed." @default.
- W47472192 created "2016-06-24" @default.
- W47472192 creator A5011486975 @default.
- W47472192 creator A5053220484 @default.
- W47472192 date "2001-01-01" @default.
- W47472192 modified "2023-09-24" @default.
- W47472192 title "Chapter 2 Triggering of photomovement - molecular basis" @default.
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