"woodjutt" > wrote in message
...
>
> Chemical reactions within yeast are facilitated by enzymes, which are
> large organic catalysts. Each enzyme has an "optimal temperature range"
> -- a temperature range at which it performs best. For many enzymes, the
> optimal temperature range is what we would perceive as warm -- about the
> same as normal internal human body temperature.

For the first three days it was bubbling and boiling away like crazy and
then went dead when I had that cool night. But after it warmed up again it
took off. Only this time I put a child heating pad under it so that it
wouldn't cool down at night.