CHAPTER IX 



PBRMBNI - OB ENZYME 



< toe of the mosl b1 rikii '_ r developn 

 istry concerns the nature of enzyme action. markal 



the facta that have been bronghl to light tl 



py one engaged in the Btndy of life pi 

 of thai study may be to know something 



• occupying the attention of inv< in this In this 



chapter a brief survey will be given of Borne i 

 tempi will In- made at completeness, and only wl 

 Bake of example will reference 1"' made to individual I 

 action. 



The discovery by Buchner that an enzyme can 1" 

 cells which is capable of instantly bringing about tl • 



tation of dextrose solutions has 1 a responsibl 



modern advance. Formerly, yeast cells were belies 

 alcoholic fermentation as a result of their growth: it 

 a life phenomenon, or "vital process " Not we ki 

 produce an intracellular ferment or endo-enzyme* to which i1 

 properties are due and which can acl apai 

 It is no great Btretch of imagination to think of all ch< 

 mediate, i by cellular activity as due to a similar mechanism, and tl 

 has led to the hypot thai all pi 



the animal ami plant are caused by enzyn 

 day we knew only of the extracellular enzymi 

 the digestive ferments), thai is 

 cells, but Becreted from them and acting 

 we must recognize intracellular enzym< 

 in thp protoplasm of the cell Bui •• •■ m 

 carry as too far. Without further ; 

 that the riddle i is thus Boh i 



\ •■■ • sample of »1 which 



Ruppoaed to pla) in the animal economy i 

 protein. I >lj tic enzym< 



the animal an. I plai ' !'■; I 



*Th< •'"i" 



