X-Ray Sensitivity 



103 



It should be pointed out that some of the higher concentra- 

 tions of alcohols used here are toxic under conditions other 

 than those employed in these experiments, where the tempera- 

 ture was always held near 0°C. At low concentrations of 



PROTECTIVE ACTiON OF ALCOHOLS 



•0--^ 



I0--4- 



• METHANOL 

 9 ETHANOL 

 O PROPANOL-2 



60,000 r 

 AIR 

 -v2'C 

 8R0TH- GROWN 

 CELLS 



I 2 



MOLAR CONCENTRATION 



Fig. 5. Survival of E. coli in different concentrations of methyl, 

 ethyl and iso propyl alcohols. Burnett, Stapleton, Morse and 



Hollaender (1^51). 



alcohols, i.e. less then 1 m, these compounds become pro- 

 tective if the bacteria are incubated in their presence for 

 30 minutes at 37°C. (Fig. 6). 



It is of interest that sodium hydrosulphite (NagSaO^), a 

 strong reducing compound, gives protection in low concen- 



