A. A. BENSON 



393 



H.COH 



HXOH 



O — CH, 

 I 

 H-C-OH 



I 

 HjCO-CO 



CuHsa 



Fig. I. The chloroplast glytolipids, ^-D-galactopyranosyl inonoglyceride, sul- 

 fodcoxvhexopvranosyl nionoglyccritle (structure not complctch established), and 

 a-u-galactopyranosvl (1 -> G) /:ii)-galactopyranosyl nionoglyceride. 



in 



iio- 



UJ 



£7h 



o 6 



is 



z 



Hi 4 

 u 



z 



o 3 - 



HoCO — 



! 

 H-C-OH 



I 

 H2COH 



0" 



-p— 



^ic:^^ 



-OCHo 



1 

 H-C-0-CO-R 



H2CO-CO-R' .^ 



Fig. 2. Phosphatidyl glycerol. \^ 



LIGHT 



DARK 



LIGHT 



^-'^ GPG LIPID 



^. 



~^o. 



GPG 



~o 



TIME 



24 HOURS 



-J_l I I L_L 



12 3456 MIN 



Fig. 3. Effect of illumination upon concentrations of diglycerophosphate (GPG) 

 and phosphatidyl glycerol (GPG lipid) in Chlorella. 



holism of diglycerophosphate in Chlorella, even before its chemical 

 identification. Algae grown and harvested at high light intensity con- 

 tained small amounts of the diester, Avhile cells cultured at low in- 



