ORIGIN AND MAINTEN. OF OPT. ArTIVITY 



49 



TABLE 8 



Deamination of Optically Active M/20 Amino-acids by Slices 

 OF Rat Kidney (Krebs, 1933) 



TABLE 9 



DEAiriNATioN OF M/50 Amino-acids by Slices of Liver axd Kidney 

 OF Different Animals (Kisch, 1935) 



(The velocity of deamination is expressed in mI/5000 of NH3 per 

 gram of fresh weight of tissue in 2 hours) 



Animal 



Organ 



Number 



of 

 experi- 

 ments 



Amino-acid 



Velocity of deami- 

 nation of the 



natural 

 isomer 



0) 



unnatural 

 isomer 



(d) 



Ratio of the 

 velocity of 

 deamination 

 of the un- 

 natural to 

 that of the 

 natural 

 isomer 



