. Biophysical science. Biophysics. 20 : 5/ Photosynthesis 371 all photosynthetic cells. The phycobilins are pigments found in some algae and bacteria. In some fashion, all of these pigments act together so that light photons absorbed by any of them are equally effective for photosynthesis. (Some carotenoid pigments occur outside of chloro- plasts and are completely ineffective for photosynthesis.) All chlorophylls contain a porphyrin structure, similar to that of the heme groups discussed in Chapter 18. An atom of magnesium rather than iron is found in chlorophyll. Attached to the hydrophilic
. Biophysical science. Biophysics. 20 : 5/ Photosynthesis 371 all photosynthetic cells. The phycobilins are pigments found in some algae and bacteria. In some fashion, all of these pigments act together so that light photons absorbed by any of them are equally effective for photosynthesis. (Some carotenoid pigments occur outside of chloro- plasts and are completely ineffective for photosynthesis.) All chlorophylls contain a porphyrin structure, similar to that of the heme groups discussed in Chapter 18. An atom of magnesium rather than iron is found in chlorophyll. Attached to the hydrophilic por- phyrin ring is a long hydrocarbon side chain which is soluble in lipids. (Thus, chlorophyll should be a detergent!) All green plants have a type of chlorophyll called chlorophyll a and most also have another, namely, chlorophyll b. The two can be converted from one to the other in extracts, but no such change has ever been demonstrated in whole H,C. H,c -CH, H H H H H H H Q C C C C C G C CH3 VVVVVtVV H | H I H | H A CH3 CH, / \ CH3 H CH3 Figure 6. Structure of chlorophyll a. Chlorophyll £ differs in having a carboxyl O group —C in place of the starred —CH3. \ OH. 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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