Like all batteries, eventually it gets depleted and needs to be replaced; this can be expected to happen after 5-10 years, depending on system usage. CMOS checksum error (and similar messages) or the system clock being reset are classic signs of the battery having been depleted. The BIOS settings contain several system-critical values.
In order to grow, yeast need glucose (C 6 H 12 O 6) or sucrose (table sugar, C 12 H 22 O 11), water (H 2 O) and warm temperatures. As yeast digest sugar, they turn into alcohol. In the process they give off carbon dioxide (CO 2) gas. The alcohol dissolves in the water and the gas escapes into the air. Yeast is used to make bread.
Once the dough or ferment temperature exceeds about 105 F (41 C), the fermentation rate declines. Yeast enzymes are generally inhibited at this temperature. Table 5 below (derived from Pyler) correlates the effects gas production and temperature in liquid ferments.As can be seen, gas production increases as the temperature rises to 100 F (38 C). It then declines at higher temperatures.nterestingly, the fermentation is faster at 35 C (95 F) and an earlier exhaustion of the maltose supply occurs. Thus the final decline in the carbon dioxide is most pronounced here rather than at the bit higher temperature of 90.5 C. (32.5 C).