Biophysics of Photoreceptors and Photomovements in - download pdf or read online

By Wilhelm Nultsch (auth.), F. Lenci, F. Ghetti, G. Colombetti, D.-P. Häder, Pill-Soon Song (eds.)

This quantity comprises the lectures given on the NATO complex examine Institute on "Biophysics of Photoreceptors and Photomovements in Microorganisms" held in Tir­ renia (Pisa), Italy, in September 1990. The Institute was once subsidized and as a rule funded by way of the clinical Affairs department of NATO; the actual technology Committee and the Institute of Biophysics of nationwide learn Council of Italy additionally supported the college and considerably contributed to its good fortune. it really is our friendly accountability to thank those institu­ tions. Scientists from very various backgrounds contributed to the knowledge of this quickly constructing box of analysis, which has visible huge development over the past years. The parts of craftsmanship ranged from behavioral sciences, supported by way of sophi­ sticated recommendations equivalent to photograph research or laser mild scattering, to spectroscopy, ap­ plied, in numerous time domain names, to the examine of the first photoreactions, to electro­ body structure, biochemistry or molecular biology, with the purpose of interpreting many of the steps of the transduction chains and the way they keep an eye on the motor equipment of the cells. The organisms studied lined a variety, from micro organism to algae, fungi and different eukaryotes. hence, the ASI represented a winning chance for sporting on and imple­ menting an interdisciplinary method of the examine of the biophysical foundation of photore­ ception and photosensory transduction in aneural organisms, with certain recognition to the fundamental phenomena and the underlying molecular occasions. we are hoping that this e-book has stuck the spirit within which the ASI used to be conceived.

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1986). _ max at 865 nm (Norris and Schiffer, 1990). Peridinin (Fig. , Gonyalaux polyedra, Amphidinium carterae, and Gyrodinium dorsum. This carotenoid pigment harvests blue light (>. , 1976; Koka and Song, 1977). It is possible that peridinin not only serves as an efficient antenna pigment for photosynthesis in marine dinoflagellates, but may also function as the photosensor for blue light-mediated phototaxis in Gyrodinium dorsum (Forward, 1973). , 1976; Koka and Song, 1977). Although other interpretations are possible for the observed spectroscopic data, the dimer model appears to satisfactorily account for the spectral shift and the high energy transfer efficiency of peridinin in the dinoflagellate light-harvesting complexes.

Chem. 92:2101. , 1989, The C=C stretching Raman lines of B-carotene isomers in the S1 state as detected by pump-probe resonance Raman spectroscopy, Chem. Phys. , 154:321. , Kolaczkowski, S. , and Atkinson, G. , 1990, Picosecond timeresolved resonance Raman scattering and absorbance changes from carotenoids in light-harvesting systems of photosynthetic bacterium Chromatium vinosum, J. Am. Chem. , 112:4664. Heelis, P. , and Sancar, A, 1990, Excited-state properties of Escherichia coli DNA phatolyase in the picosecond to millisecond time scale, Biochemistry, 29:5694.

Though tentative, it is likely that polarotropic responses exhibited by Mougeotia and fern protonemata, vide supra, entail a reorientation of the chromophore and/or rotation of the protein (Song, 1983b), as the Qy-transition dipole directions of Pr and Pfr remain essentially unaltered (Song and Yamazaki, 1987). Phytochrome equally efficient as "on" and "oft" light sensor switches. Perhaps the phytochrome molecule has evolved as a light sensor in such a way that the critical role of the apoprotein is to fix a specific chromophore conformation(s), thus modulating the absorbance maximum, which is clearly demonstrated, especially in its photo chromic transformation.

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