Current topics in photosynthesis: Dedicated to Professor by V. V. Shubin, N. V. Karapetyan, A. A. Krasnovsky (auth.), J.

By V. V. Shubin, N. V. Karapetyan, A. A. Krasnovsky (auth.), J. Amesz, A. J. Hoff, H. J. Van Gorkum (eds.)

Four a long time in the past, whilst Lou Duysens used to be approximately to begin his paintings on fluo­ rescence and effort move in photosynthesis that will bring about his thesis [1], little or no used to be identified in regards to the molecular mechanisms of photosyn­ thesis, definitely from our present-day perspective. even though, this situation may speedily swap within the resulting years by means of the creation of contemporary actual and biochemical concepts. specifically the sector of optical spectroscopy, on which the paintings of Duysens had this kind of major impression, has proved to be the most fruitful suggestions within the research of basic strategies and electron move reactions in photosynthesis. Duysens' thesis tested the function of power move in photosynthesis and likewise confirmed for the 1st time the life in photosynthetic micro organism of light-induced absorbance adjustments of what's referred to now because the basic electron donor P-870. next stories by way of an analogous process tested the photo-oxidation of cytochromes, either in micro organism [2] and in algae [3,4] and of the absorbance alterations [3] that have been later chanced on to be as a result of electro chromic band shifts of antenna pigments. Measurements of cyto­ chrome kinetics in mild of assorted wavelengths resulted in the idea that of 2 photosystems in eco-friendly plant photosynthesis [5], while a examine of the criteria affecting the fluorescence yield of chlorophyll gave the 1st infor­ mation at the electron acceptor Q of picture process II [6].

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Additional info for Current topics in photosynthesis: Dedicated to Professor L.N.M. Duysens on the occasion of his retirement

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This model is intended to explain the fluorescence polarization of the complexes, which suggests that the Qy transition dipoles all lie approximately parallel to the plane of the chromatophore membrane but have a circular degeneracy in that plane [4, 5,6,7,26]. The positions and orientations of the BChls on the individual a{3-units are chosen to account for the CD and LD spectra of the complex. Kramer et al. [26] do not discuss the exciton interactions between the BChls on different a{3-units, whose Qy dipoles form opposite sides ofthe square, although in their model the distance between these molecules is similar to that between the BChis on the same a{3 -units.

In the oligomer shown in Figure lB, the dipolar interaction energy between the dominant Qy exciton transitions of the two dimers is only 35 cm- 1 . This is much smaller than the interaction energy of 728 cm- 1 between the individual Qy transitions of the BChls in each dimer, as calculated for the dimer in Figure lA. The sensitivity of the CD spectrum to weak interactions between dimers stems partly from the fact that the rotational strengths of the oligomer's bands is proportional to the distance between the dimers, even though the splitting of the bands decreases [35].

E. at about 50 nm longer wavelength than BChl c, and it has been suggested that BChl a would function as an intermediate in the transfer of energy from BChl c to the cytoplasmic membrane [2, 3]. In this communication it will be shown that in isolated chlorosomes light energy absorbed by BChl c is transferred to BChl a 792. A tentative model for the three-dimensional organization of both pigments of the chlorosome will be presented, based on fluorescence polarization and linear dichroism spectra.

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