522 



INDEX 



Rhodospirillum ruhrum (Contimied) 

 treatment with phenj'l mercuric ace- 

 tate of, 103-195. 

 whole-cell suspensions of, ITO-UK'i. 

 Rhodn.spirilliim rii}>ni m-vyiochromo r, 

 151, 15G-157. 

 absorption spectrum of, 167. 

 Rhodospirillurn ruhrum yellow pigment, 



152-153, 157. 

 Rhj'thms 



endogenous. See Endogenous rhijthms. 

 induced. See Induced rhythms. 

 Riboflavin, 95-99. See also FMN. 

 Ribuiose diphosphate, synthesis in 



etiolated plants of, 225. 

 Rohinia Pseudo- Acacia, Hill reaction 

 activity of, 280. 



S38. See Sidfur-35. 



Saponins, reversible inhibition of 



chloroplast reaction by, 275. 

 Saturation, rate of oxygen liberation 



at, 365. 

 Saturation phenomena, 119-122. 

 Scattering of light 

 in cells, 100-106. 

 by chloroplasts, 103. 

 by colloidal chlorophyll, 103. 

 by crystalline chlorophyll, 103. 

 detection of pigments by, 105. 

 effect of temperature on, 172. 

 by grana, 103, 172. 

 by plant cells, 75, 100-106. 

 relation to index of refraction of, 



103-104. 

 restriction of, 85. 

 Scenedesmus 



adapted. See Adapted Scenedesmus. 

 chlorophjdl in, 365. 

 transients in gas exchange of, 406- 

 407. 

 Scenedesmus obliquus Dz, 134, 233-238, 



245. 

 Sedimentation pattern, of protochloro- 



phyll holochrome, 469. 

 Self-absorption of fluorescence 



l)y algal cells in su.spensions, 110- 



111. 

 by dye solutions, 5-6, 111. 

 Self-q\ienching 



bimolecular. See Bimolerular self- 

 quenching. 

 by induced resonance, 6. 

 as a quadratic function of concentra- 

 tion, 6. 

 Semiquinones, 68-69, 143. 

 Sensitized fluorescence, of chlorophyll 



a b}" h, 6, 7, 143. 

 Serine, synthesis in etiolated plants of, 



225. 

 — SH. See Sulfhydryl. 

 Sodium hydrosulfite. See Hydrosulfite. 

 Solarization, 449. 

 Sonic treatment, method of extraction 



by, 162. 

 Soret band, 10, 177, 187. 

 Spectrophotometer, 6, 8, 60, 61, 69, 

 72, 73, 75-82, 85, 89-90, 

 10.3-106, 140, 164, 172, 174, 

 185, 189, 192. 

 use of, 8, 59-67, 68-71, 79, 85-87, 

 89-97, 165-168, 175-176, 186- 

 187, 189-190, 193-195. 

 Spectroscopy, of chloroplasts, 75, 85. 

 Spinacea oleracea, Hill reaction activitj' 



of, 280. 

 Stannous chloride, used in photoreduc- 



tion of thionine, 50. 

 Starch 



formation of 



in broken chloroplasts, 292. 

 in isolated chloroplasts, 288. 

 Stern- Volmer quenching constant, 7. 

 Sucrose, carbon-14 in, 225. 

 Sugar phosphates 

 carbon-14 in, 225. 



effect on COo fixation by chloro- 

 plasts of, 290. 

 Sulfhydryl groups, in primary hydro- 

 gen acceptor, .331. 

 Sulfur-35, 330. 

 Sulfur bacteria. See Green sulfur 



bacteria, Purple sulfur bacteria. 



