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

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, while Lou Duysens used to be approximately to begin his paintings on fluo­ rescence and effort move in photosynthesis that will result in his thesis [1], little or no was once identified concerning the molecular mechanisms of photosyn­ thesis, definitely from our present-day viewpoint. even if, this situation could swiftly swap within the resulting years by means of the creation of contemporary actual and biochemical innovations. in particular the sector of optical spectroscopy, on which the paintings of Duysens had the sort of major influence, has proved to be some of the most fruitful concepts within the learn of basic methods and electron move reactions in photosynthesis. Duysens' thesis verified the function of power move in photosynthesis and in addition confirmed for the 1st time the lifestyles in photosynthetic micro organism of light-induced absorbance alterations of what's referred to now because the basic electron donor P-870. next reports by way of an identical technique established the photo-oxidation of cytochromes, either in micro organism [2] and in algae [3,4] and of the absorbance adjustments [3] that have been later came across to be as a result of electro chromic band shifts of antenna pigments. Measurements of cyto­ chrome kinetics in mild of varied wavelengths ended in the concept that of 2 photosystems in eco-friendly plant photosynthesis [5], while a examine of the standards affecting the fluorescence yield of chlorophyll gave the 1st infor­ mation at the electron acceptor Q of picture procedure II [6].

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

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7 -times greater than the dipole strength of a single BChl molecule (Figure 2), exciton interactions between dimers can persist to relatively large distances. For discussion, Figure lB shows two dimers that are centered about 28 A apart with their local y axes approximately perpendicular. To calculate the spectroscopic properties of such an oligomer rigorously requires diagonalizing an interaction matrix of the excited states of all four BChls. It is possible to obtain an approximate solution, however, by treating the individual dimers first and then considering interactions between the dimers, provided that the distance between the dimers is sufficiently great.

As mentioned above, this BChl probably is far enough away from the other two BChls so that exciton interactions do not perturb its absorption spectrum greatly. The shift from 770 to 800 nm presumably is due mainly to interactions of the BChl with the protein. The choice of 800 nm for calculations on other complexes is arbitrary, however, because the binding sites of the BChis probably differ [12, 13]. In principle, it should be possible to calculate the transition energies for the monomeric BChls when sufficient information becomes available on the distribution of polar groups nearby [43,20] .

3°. B. Structure of an oligomer of two BChl dimers. Each rectangle represents a dimer with the structure shown in Fig. lA; its long and short sides indicate the dimensions of the dimer in the local y and x directions, which are defined by the dimer's dominant Q y and Q x exciton transition dipoles. The coordinate system is rotated 90 ° about the yaxis relative to its orientation in A. 9°; f3 y = 89 0, and 'Yy = 4 0. In the chromatophore membrane, the B850 oligomer would be oriented with the x-axis approximately normal to the plane of the phospholipid bilayer.

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