. Biophysical science. Biophysics. 372 Photosynthesis /20 : 5 chloroplasts. The structure of chlorophyll a and its absorption spectrum are shown in Figures 6 and 7. The absorption spectrum shifts to the red on extraction from the whole cell. Similar chlorophylls are found in blue-green algae. The chlorophylls in bacteria, however, have different absorption maxima and slightly different structures. Some form of chlorophyll is found in all photo- synthetic organisms. Those in euglena are chlorophylls a and b. Carotenoid pigments are involved in photobiology, not only in photo- synthesis but also
. Biophysical science. Biophysics. 372 Photosynthesis /20 : 5 chloroplasts. The structure of chlorophyll a and its absorption spectrum are shown in Figures 6 and 7. The absorption spectrum shifts to the red on extraction from the whole cell. Similar chlorophylls are found in blue-green algae. The chlorophylls in bacteria, however, have different absorption maxima and slightly different structures. Some form of chlorophyll is found in all photo- synthetic organisms. Those in euglena are chlorophylls a and b. Carotenoid pigments are involved in photobiology, not only in photo- synthesis but also in vision. As described in the preceding chapter, many vertebrate visual pigments involve a carotenoid derivative called retinene. In addition, the eyes of snakes and birds have carotenoid. 380 420 460 500 540 580 620 660 700 Wavelength (mu.) Figure 7. Relative extinction coefficient of chlorophyl a in methanol. After D. G. Harris and F. P. Zscheille, Botanical Gazette 104: 515 (1943). Copyright 1943 by the University of Chicago. oil droplets which appear to act as filters. A variety of carotenoid pigments are also found in chloroplasts. The general structure of carotenoids is shown in Figure 8, while two absorption spectra are illustrated in Figure 9. The carotenoids apparently act to absorb the photons which the chlorophylls miss and somehow pass the energy on to the chlorophyll. The action spectrum, that is, the relative yield of hexose, at constant light intensity is shown in Figure 10. The most striking feature of this. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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