70 



PROBLEMS IN PHOTOSYNTHESIS 



h. Over-compensated 



5 min i 



5 min i + i' 



5 min i 



5 min / + i' 



5 min / 



5 min i -{- i' 



5 min i 



5 min i -{- i' 



5 min / 



5 min i -\- i' 



25 min / 



25 min / + /' 



;^o, = +46.3 Ml 



c. More Over-compensaled 



5 min 

 5 min 

 5 min 

 5 min 

 5 min 

 5 min 

 5 min 

 5 min 

 5 min 

 5 min 

 5 min 

 5 min 



25 min 



25 min 



+ t' 

 + i' 

 + t' 

 + t' 

 + i' 

 + i' 



Large Vessel 

 Pressure Changes 



+ 14, 

 + 15. 

 + 14. 

 + 16, 

 + 12, 

 + 16, 

 + 14, 

 + 14, 

 + 11, 

 + 15. 

 + 12. 

 + 14, 



mm 



mm 



mm 



5 mm 



5 mm 



5 mm 



mm 



mm 



5 mm 



mm 



mm 



5 mm 



+ i' 



+ 87 . 5 mm 

 + 110.0 mm 



30 min i 



30 min / + /' 



+ 78.0 mm 

 + 91 .5 mm 



calculated for 

 30 min 

 h' = + 27 . mm 



xo = +36.3 /.tl ATco, = — 32.6 /il 



h = +13.5 mm 

 -0.9 1/^ = 4.5 



2. Difference between acid and alkaline culture media 



Four experiments show that for the same cell suspension (200 jul cells per 

 vessel) the quantum requirement in acid medium (pH 5) averages 3.75, 

 whereas in alkaline medium (pH 9.2) the average value obtained, 10.15, 

 is three times as great. For both media the quantum requirement has 

 practically the same value below and above the compensation point. The 



