INDEX 



509 



oxidation of, 193. 



reactions with Rhodospirilluin 



rubrum of, 179, 184. 

 Cytochrome/, 150-162. 



absorption changes in, G4-65. 



in algae, 150-151. 



in bacteria, 152-155. 



competition of CO2 with, 64-65. 



oxidation bj^ Chlorella of, 159. 



in plants, 150-151. 



presence in chloroplast preparations 



of, 267. 

 Cytochrome oxidase, action of CO on, 



319-320. 

 C3'tochromes 



absorption spectra of, 324. 



in Chlorella, 170-171. 



in chloroplast reaction, 266-268, 271. 



direct excitation of, 271. 



oxidation of, 174-178. 



in Porphyridium, 170-171. 



reduction of, 191, 201. 



as trapping centers, 88. 



DAL, 475. 



Dark CO2 reduction, 232-233. 

 "Dark" cells 

 of algae, 488. 



life cycle of, 488. 

 Dark interval 

 effect of 



on oxygen burst, 423. 

 on photosynthesis, 75-84. 

 Dark phosporylation, of Chromatium, 



311. 

 Dark reactions 



carbon-14 fixation in, 205. 



CO2 fixation in, 205-231, 288. 



in Hill reaction, 263, 381. 



kinetic effects of, 193-195. 



in photosynthesis, 205-223, 359, 419, 



430. 

 of Rhodospirilhim rubrum, 179-180, 

 193-195, 303, 311. 

 Dehydration, of chlorophyll, 35. 

 Delayed light emission. See Chemi- 

 luminescence. 



Denaturation, caused b}' detergents, 



275, 283, 473. 

 Detergents, denaturation caused by, 



275, 283, 473. 

 Dibromofluorescein, limiting quantum 



yield of, 52. 

 Dichroism, in chloroplasts, 100, 105, 

 461. See also Double Refrac- 

 tion. 

 Difference spectrum. See Absorption 



spectrum. 

 Differential absorption spectrum, 59, 



70, 185. 

 Diffusion, of photoproduct, 363. 

 Diffusion factor, in manometry', 407. 

 Dinitrophenol. See DNP. 

 Diphenyl methane dyes, fluorescence 



of, 53. 

 DNP, 253-254. 



effect in nitrite reductions of, 254- 



255. 

 as inhibiting agent, 298. 

 Double-beam spectrophotometer, use 



of, 18, 59, 70, 89, 185. 

 Double refraction, in chloroplasts, 100, 



105, 461. 

 DPN 



addition to Rhodospirilluin rubrum 



of, 195-196. 

 reduction by chloroplasts of, 266- 

 268, 379. 

 DPNH, 195-196, 199. 

 Dye-photosensitized reactions, 21, 31. 

 Djes 



in bound states, 53. 

 effect on quantum 3'ield of photo- 

 reduction of, 52, 53. 

 in long-hved states, 52. 

 photoreduction of, 50-56. 

 in the presence of polymeric material, 

 53. 



EDTA, use in photoreduction of, 51. 

 Electronic levels, of chlorophyll, 13. 

 Electron transfer reactions 



