ENDOGENOUS CATABOLISM 



19 



tion is required to furnish the energy necessary for 

 reduction. 



Table 4. — Influence of Oxygen under Various Pressures at 

 37°C. UPON Different Bacteria (24 Hours' Exposure) 



Oxygen pressure in atmospheres 



1 IK 2 3 4 10 20 30 40 50 60 70 75 



Effect on growth (0 means no growth during twenty-four hours' exposure) 



B. anthracis 



Bad. alkaligenes, 3 strains. 



Vibrio cholerae 



Ps. pyocyanea 



Bad. typhosum, 3 strains. . 



Bad. paratyphosum 



Proteus vulgare 



Bad. coli, 4 strains 



Bad. enteritidis 



Micr. pyogenes aureus. . . . 



Effect on viability (0 means dead after twenty-four hours' exposure) 



B. anthracis 



Bad. alkaligenes, 3 strains. 



Vibrio cholerae 



Ps. pyocyanea 



Bact. typhosum, 3 strains. . 



Bad. paratyphosum 



Proteus vulgare 



Bad. coli, 4 strains 



Bad. enteritidis 



Micr. pyogenes aureus. . . . 



The cell disposes of molecular oxygen for two reasons: 

 to obtain energy, and to prevent oxidation of vital cell 

 constituents. If the oxygen concentration is increased, 

 the cells may not be able to prevent oxidation of the 

 essential parts, and the cell dies. Table 4 gives some 



