524 



INDEX 



Uniformity 



of algae, 485. 



of Chloretla, 485. 



effect of periodicity in light-dark 

 cjxle on, 487. 

 Urethane, 78, 141. 



effect on Hill reaction of, 388. 

 Uroporphyrin 



absorption spectrum of, 482. 



chemistry of, 477. 



enzymatic synthesis of, 475-483. 



precursors of, 475-483. 



Vitamin K 



absence of 



in Chromatium, 160. 

 in purple bacteria, 2G2. 

 in chloroplasts, 160, 255, 262, 267. 

 as cofactor in phosphorylation, 



340-343. 

 effect on photophosphorj'lation of, 



309-310. 

 in photosynthesis, 160. 

 Water, effects on fluorescence of chloro- 

 phyll molecule of, 13. 



Zinc tetraphenyl porphine, absorption 

 spectrum of, 35. 



