Subject: Why do the yeast die???

Hi, it's just a question to put my mind at ease. I have just completed a 
project investigating the effect of ethanol concentration on yeast 
activity during the fermentation process. And it went OK, at higher 
concentrations of ethanol, the rate of reaction decreased, and eventually 
stopped.
My question is why do the yeast slow down and stop? I know that it is 
related to the effect of the alcohol on the metabolic processes occuring 
in the yeast cell, and that the alcohol will kill the yeast. But why?? 
can't find an answer to what the alcohol actually does - how does it kill 
the yeast?
Thanks for your time

Re: Why do the yeast die???