42 The Nature of Biological Diversity 



chlorophyll) turns out to play a role, we would then have a third 

 powerful selective factor favoring the chlorophyll structure. 



The mechanism and the detailed chemical and physical reasons for 

 this ohvious advantage of the chlorophyll over the porphyrin remain 

 for the future to discover. 



References 



1. J. A. Bassham and Melvin Calvin, The Path of Carbon in Photosynthesis, 

 Prentice-Hall, Inc.. Englewood Cliffs, N.J. (1957). 



2. J. A. Bassham and Melvin Calvin, The Photosynthesis of Carbon Compounds, 

 W. A. Benjamin, Inc., New York (1962). 



3. J. A. Bassham, Photosynthesis. J. Chem. Education, 36:548-554 (1959); J. A. 

 Bassham and M. R. Kirk, New aspects of photosynthesis, J. Chem. Education, 

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4. M. Calvin, Evolution of enzymes and the photosynthetic apparatus, Univ. Calif. 

 Radiation Lab. Rept UCRL-3915 (Aug., 1957). Also, M. Calvin, Evolution of 

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5. M. Calvin, Chemical evolution and the origin of life, Idea and Experiment, vol. 

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6. M. Calvin, Chemical evolution and the origin of life, Am. Scientist, 44:248-263 

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7. M. Calvin, Round trip from space, Evolution, 13:362-377 (1959). 



8. G. Milhaud, J. P. Aubert, and J. Miller, Le metabolisme du carbone dans le 

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9. R. C. Fuller and M. Gibbs, Aberrant patterns of some photosynthetic enzymes, 

 Plant Physiol., 31, Suppl.: xxi (1956). 



10. J. A. Bassham and M. R. Kirk, Dynamics of the photosynthesis of carbon com- 

 pounds. I. Carboxylation reactions, Biochim. et Biophys, Acta, 43:447-464 

 (1960). 



11. M. Calvin, Some photochemical and photophysical reactions of chlorophyll and 

 its relatives, Light and Life Symposium, Johns Hopkins Press, Baltimore (1961), 

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12. M. Calvin, Quantum conversion in photosynthesis, J. Theoret. Biol., 1 :258— 287 

 (1961). 



13. C. B. van Niel, Evolution as viewed by the microbiologist, in The Microbe's 

 Contribution to Biology, Harvard University Press, Cambridge, Mass. (1956). 

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14. R. Y. Stanier, Photosynthetic mechanisms in bacteria and plants: development 

 of a unitary concept, Bacteriol. Rev., 25:1-17 (1961). 



15. D. I. Arnon, Cell-free photosynthesis and the energy conversion process, Light 

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16. D. I. Anion, Conversion of light into chemical energy in photosynthesis, Na- 

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17. M. Calvin, The photosynthetic carbon cycle, J. Chem. Soc, 1956:1895-1915. 

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