MECHANISM OF DEATH 



379 



Bad. coll in buffered mineral solutions of different pH, 

 as well as in tap water and distilled water. The death 

 rate for Bad. coli is lowest between pH 5 and 6.4, and 

 increases if the pH is increased or decreased beyond these 

 limits (see p. 340). 



Table 121. — Colon Counts in Dilute Sewage Held in 

 Parchment Bag in Running Water 



The death rates of Cohen's experiments show very 

 clearly the effect of reserve food material, which causes a 

 period of very slow death, as indicated by an increase 

 of the death rate. At 0°C., this is overshadowed by a 

 cold-shock effect, which even at 10°C. is still noticeable. 



Table 122. — Temperature Coefficients of Starvation 



