690 



LIGHT ABSORPTION BY PIGMENTS IN VIVO 



CHAP. 22 



100 

 90 

 80 



G, Fucus single cells according to Gaidukov 



R, Phyllitis occordingto Relnke 



£, Brown cells according to Engelmonn 



500 600 700 



WAVE LENGTH, m/i 



Fig. 22.19. The transmission spectra 

 of brown algae (after Seybold 1934). 

 Maximum of transmission is at 600 m^i 

 instead of ^^550 mju as in green plants 

 and algae (figs. 22.17-18) because of 

 the presence of fucoxanthol. For ab- 

 sorption curves of Fucus and Laminaria, 

 see Seybold and Weissweiler (1943')- 



•- 400 500 600 700 



WAVE LENGTH, m/i 



Fig. 22.20. Transmission T, reflec- 

 tion R and absorption A of the red 

 alga Delesseria (according to Seybold 

 1934). More recent curves for Delesseria 

 and Porphyra are given in Seybold 

 (1943); for Iridaea and Gigartina, see 

 Van Norman, French and Macdowall 

 (1948). 



500 600 700 800 



WAVE LENGTH, m/i 



Fig. 22.21. Absorption spectra, (/ - S)/I = {I - T - R)/I, of Chlor- 

 ella suspension (after Noddack and Eichhoff 1939). About 1.1 X 10' cells 

 and 1.6 X 10"^ g. chlorophyll a and 6 in 1 ml. A, 35 ml. pigment extract 

 in a vessel 3.90 cm. thick; B, cell suspension, same volume, same vessel. 



