CONTENTS XUl 



Photoreduction in Ochromonas malhamensis 



Wolf Vishniac and George H. Reazin, Jr 239 



Manganese as a Cofactor in Photosynthetic Oxygon Evolution 



Erich Kessler 218 



3. Reduction of Various Oxidants 



Contributions to the Problem of Photochemical Nitrate Reduction 



Erich Kessler 250 



Certain Effects of Ascorbic Acid on the Reduction of Oxygen in Chloro- 

 plast Preparations 

 Helen M, Habermann and Allan H. Brown 257 



4. Reactions in Chloroplasts and Cell Extracts 



Some Features of the Chloroplast Reaction 



C. P. Whittingham 263 



Natural Inhibitors of the Hill Reaction 



K. A. Clendenning, T. E. Brown, and E. E. Walldov 274 



Light-Dependent Reductions in a Cell-Free System 



Wolf Vishniac 285 



Photosynthetic Carbon Dioxide Fixation by Broken Chloroplasts 



M. B. Allen, F. R. Whatley, Lawson L. Rosenberg, J. B. Cap- 



INDALE, and Daniel I. Arnon 288 



General Concept of Photosynthesis by Isolated Chloroplasts 



Daniel I. Arnon, M. B. Allen, and F. R. Whatley 296 



5. Phosphate Metabolism 



Light-Induced Phosphorylation by Cell-Free Preparations of Rhodo- 



spirillum rubrum 



Albert W. Frenkel 303 



Light-Induced Phosphorylation in Extracts of Purple Sulfur Bacteria 



Jack W. Newton and Martin D. Kamen 311 



A Light-Reversible Carbon Monoxide Inhibition of Isotopic Phosphate 



Uptake by Photosynthesizing Barley Leaves 



Albert R. Krall 313 



Isolation of a Possible Primary Hydrogen Acceptor from Photosj^n- 



thesizing Barley Leaves 



Albert R. Krall 327 



Phosphate in the Photosynthetic Cj^cle in Chlorella 



E. C. Wassink 333 



Photosynthetic Phosphorylation by Isolated Spinach Chloroplasts 



F. R. Whatley, M. B. Allen, and Daniel I. Arnon 340 



PART V: Kinetics, Transients, and Induction Phenomena 



On the Efficiency of Photosynthesis above and below Compensation of 

 Respiration 

 Robert Emerson and Ruth V. Chalmers 349 



