CHAPTER II 

 PRODUCTS OF BACTERIAL ENERGY 



According to their chemical activities, bacteria are arbitrarily 

 divided into the following classes: 



Photogens Chromogens Zymogens 



Saprogens Aero gens Pathogens 



Photogens are those bacteria of the sea, putrefying flesh, and 

 damp rotten wood, that produce a faint phosphorescence. 



Chromogens are bacteria that produce colors as they grow, nota- 

 ble among which may be mentioned the Staphylococcus aureus, 

 that are golden in hue; B. pyocyaneus, of a greenish-blue; and 

 B. prodigiosus which appears a brilliant red. 



Zymogens are the bacteria of fermentation, which is the 

 chemical transformation of carbohydrates by the action of bac- 

 teria, with the evolution of CO2 CO & H. Such bacteria are use- 

 ful in the industries for the production of alcoholic beverages, 

 wine, beer, etc. Through the actions of these organisms grape 

 sugar is converted into alcohol, lactic acid, and acetic acid. 



C 6 Hi 2 O 6 = 2 C 2 H 6 O + 2 CO 2 



glucose 2 alcohol 2 carbonic acid 

 or 



C 6 Hi 2 O 6 = 2 C 3 H 6 O 6 



2 lactic acid 

 or 



C 6 H 12 6 = 3C 2 H 4 2 



2 acetic acid 

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