328 ORGANISATION IN SPACE AND TIME 



curve obtained by Burton with a hydrodynamic model 

 (Fig. 32). 



K. G. Denbigh and his colleagues^^ gave analogous curves 

 for the chemical reaction of the oxidation of glucose. We 

 must also draw attention to yet another curve obtained by 



KIO3 



in ml. 



■o — o- 



"W^-^^ 



JQ. 



-i_ 



30 50 70 90 no 150 150 170 



TIME IN MINS. 



Fig. 33. Changes in the stationary state during the 



enzymic oxidation of ascorbic acid (after Pasynskii 



and Blokhina). Explanation in text. 



A. Pasynskii and V. Blokhina^^ for the reaction of enzymic 

 oxidation of ascorbic acid occurring under the conditions of 

 an open system. The experiment was conducted as follows : 

 a solution of 12 per cent of ascorbic acid and 02 per cent 

 of hydrogen peroxide was passed through a small cylinder 

 covered at one end by a cellophane membrane. The other 

 side of the membrane was washed with a stream of distilled 

 water. In the diagram (Fig. 33) the ordinate shows the titre 

 of ascorbic acid in the mixture and the abscissa the time 

 in minutes. 



When the stationary state had been established (A B), a 

 solution of peroxidase was introduced into the cylinder at 

 the point B, and its titre fell to level C. Owing to the associa- 

 tion of the decrease in the concentration of ascorbic acid 

 with a decrease in the rate of its diffusion through the mem- 

 brane, however, after reaching a minimum BCD, a new 

 stationary state was established at level DE. This experiment 



