VELOCITY OF REACTIONS 



Dried rennet is extremely slowly decomposed at 

 that temperature. At 158 C. the constant is K = 

 0-041. This circumstance recalls the "denaturation" 

 of egg-albumen at high temperatures, for which also 

 the presence of water is necessary. 



16 



12 



o 



C 



o 

 (J 



.10 



08 



06 



\o 



<\ 



40 



with Alkali 



80 



Time 



120 



160 mm 



without Alkali 



FIG. 5. 



The enzymatic reaction which has l>ren most 

 thoroughly investigated is that of invertase on cane- 

 sugar. The invertase was prepared from yeast-cells. 

 VICTOR HKNRI determined (1902) the velocity of in- 

 version of sugar with this enzyme and observed that 

 it behaves in a manner quite different from a mono- 

 molecular reaction. This experiment was controlled 



