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Re:Temp. effects on yeast production

     >Obviously CO2 production rises with increased temperature (in a yeast 
     As a general rule of thumb, enzymatic reactions double their rates for 
     every ten degree (centigrade) increase in temperature.  Thus, you 
     could expect to go from 1 bubble/second at 20C to 2 bubbles/second at 
     30C, given that nothing else is limiting the reaction rate.
     Enzymes are labile at extreme temperatures, but this rule of thumb 
     should hold for normal room temperatures.  I do not know the upper 
     temperature limit for yeast, but I would imagine anything over 50C 
     would result in death.  Frozen yeast aren't too productive, either.