'20 



B 15 



1.0 



0.5 



.^2.0 



I 5 



~ 10 



0.5 



Figure 

 fluo 

 func 

 in a 

 ref. 



2.0 



>- i.o - 



A Number of cells 



O Phosphate concentration 



□ Fluorescence /chlorophyll a. 



A Number of cells 



O Nitrate concentration 



□ Fluorescence / chlorophyll j]_ 



6 8 

 Time, days 



15.- Algal cell concentrations and 

 rescence/chlorophyll a ratio as a 

 tion of phosphate and nitrate levels 

 lgal growth medium. (Adapted from 

 27.) 



O Temperature 

 A Fluorescence 



J L 



J L 



40 e 



30 ' 



20 e 



I0< 



a> 



k. 



3 



O 

 w 

 9 



a. 



E 



4 8 12 16 20 



Time, minutes 



Figure 16.- Relationship between temperature 

 and algal fluorescence. (Adapted from 

 ref. 27.) 



NASA-Lanqlev, 1977 L-1 1007 



39 



