CONTENTS ix 



Reactions of Cytochrome Pigments in Photosynthetic 



Bacteria 436 



Lucile Smith 



Discussion • '^^3 



Light, Pigments, and Photosynthesis 447 



C. S. FrencJi 



Discussion 471 



On the Long-Avave Decline of the Quantum Yield of Photo- 

 synthesis in the Red Alga Porphyridium cnientiim . . 475 



/. B. Thomas and Govindjee 

 Evidence for Pigments Absorbing at 705-710 niyu in 



Photosynthetic Organisms 479 



Mai-y Belle Allen 

 Comments on the Function of HAEM Proteins as Related to 



Primary Photochemical Processes in Photosynthesis . 483 



Martin D. Kamen 

 Cell-Free Photosynthesis and the Energy Conversion Process 489 



Daniel I. Am on 



Discussion 565 



Photoproduction of Molecular Hydrogen from Thiosulfate 



by Chromatium Cells 570 



M. Losada, M. Nozaki, and Daniel I. Arnon 

 Oxidation-Reduction Reactions in Chloroplasts .... 576 



Andre T. Jagendorf and Giorgio Forti 

 Reflections on Recent Theories Concerning the Mechanism 



of Bacterial Photosynthesis 587 



Albert W. Frenkel 

 On the Reductive Dephosphorylation Hypothesis of 



Photosynthetic Reductant Formation 593 



D. D. Hendley and B. L. Strehler 



Continuous Measurement of Photosynthetic Phosphorylation 



with the Firefly Luminescence Assay System . . . . 601 

 B. L. Strehler and D. D. Hendley 



The Effect of Oxygen on Photophosphorylation and the 



Effect of Carbonate on the Hill Reaction 609 



Birgit Vennesland, T. Nakamoto, and Babette Stern 



Oxidative Photophosphorylation and the Mehler Reaction 615 

 David W. Krogmann 



