67 



Spinach Leaf 

 (59-1) 



Spinach Chloroplasts 

 Off (57-"57") 



Off Seal* 



On(2X) 



Swiss Chard -Leaf 

 (59-6) 



Off Scale 



Mung Bean Leof 



Off I '^^"^ 



O" Oft Scale 



Figure 1. Light- induced oxidation of cytochrome f in three types 

 of leaves and one preparation of chloroplasts. 680 Ta\i actinic 

 light; a downward deflection corresponds to a decrease at 555 or 

 55^ niM- measured with respect to the reference wavelength (5^0 or 

 ^'•i-^ ni^). Light intensities employed relative to each other are 

 indicated by the symbols "IX" or "2X". Experiment 59, 1 - ^. 



Material 



ConparlBOn of Cytochrome t kinetics 



In different leaves and in chloroplasts 



at 77^ K 



^D* 10 ^D%ec Intensity* lo"* ii>D/sec/ Btpt. 



unit 

 Intensity 



Swiss Chard leaf 

 fresh 555-5'>0 COOS'* 



0.59 



1.5 



0.39 



59 6 



Mung bean 



leaves ^^.^ O.OOW 



(etiolated) 



0.35 



3.3 



0.11 



57a-55 



per leaf thickness 

 except for chloroplasts 

 (Im path, 0.279 mg/nl) 



Arbitrary uslts 



TABLE I 



