520 



INDEX 



Polarization 

 of fluorescence, 4()2. 



effect of quenching on, 7. 

 in viscous solvents, 5, 6, 462. 

 Polyphosphates, formation in Chlorella 



of, 334-;?39. 

 Porphobilinogen. See PEG. 

 Porphyra lacineata 



fluorescence at 730 mn of, 126. 

 luminescence of, 118-319. 

 Porphyridium, cj'tochromes in, 170- 



171. 

 Porphyrin compounds, stability con- 

 stants of, 4. 

 Preillumination experiments, with car- 



bon-14, 213-223. 

 Primary act of photosynthesis, 3, 19, 



75, 142, 164, 353, 366. 

 Primary hydrogen acceptor, 359, 372. 

 attempts at identification of, 331. 

 effect of conditions on level of, 329. 

 isolation in barley leaves of, 327- 



332. 

 — SH groups in, 331. 

 Primary photochemical step, 366. See 

 also Primary ad, Primary 

 process. 

 Primary process, 75-78, 89, 144. 



theory of, 139-142. 

 Protochlorophyll, 464-473. 

 Protochlorophyll holochrome 

 absorption spectrum of, 466. 

 molecular weight of, 472. 

 sedimentation pattern of, 469. 

 Purple sulfur bacteria, 153-155. 

 absence of vitamin K in, 262. 

 acid production by, 450-456. 

 photophosphorylation by, 311-312. 

 photosynthetic mechanism of, 164- 

 173 

 transients in, 450-456. 

 Pyridine nucleotides. See also DPN, 

 TPN. 

 absorption spectrum of, 69. 

 assay of, 45. 



effect of illumination on concentra- 

 tion of 



in algae, 45. 

 in leaves, 45. 

 effect of pH on, 69. 

 Pyropheophorbide a, infrared absorp- 

 tion spectra of, 39, 41-44. 

 Pyropheophorbide a-2,4-dinitrophenyl- 

 hydrazone, infrared absorp- 

 tion spectra of, 37, 39, 42-44. 



Quantum counter, 45, 131, 134. 

 Quantum requirement, of electron 



transfer, 26. 

 Quantum yield 

 of acid gush, 453. 

 in algae, 407-408. 

 in bacteria, 453. 

 of CO2 uptake, 237. 

 of chlorophyll-sensitized reactions in 



vitro, 19-30. 

 of chlorophyll-sensitized reactions in 



vivo, 19. 

 of ethyl chlorophyllide, 54. 

 of fluorescence, 5. 



of Chlorella, 109-111. 

 of chlorophyll a 



in the living cell, 107-111. 

 in solution, 5, 107-111. 

 of chlorophyll a and h, 107. 

 of chlorophj'U b, 5, 8. 

 in vitro, 14. 

 in vivo, 14. 

 of ethyl chlorophyllide a, 107-111. 

 of fluorescein, 108-111. 

 of photosynthetically active pig- 

 ments, 107-111. 

 of phycocyanin 



in the living cell, 107-111. 

 in solution, 107-111. 

 of phycoerythrin, 107-111. 

 as a function of cell concentration, 



109. 

 of Hill reaction, 390. 

 influence of photoperiodism on, 489. 

 of methylene blue, 51, 53-54. 

 for monomer conversion, 51. 

 of photoreduction 



