The company routinely shuts down products that have become stale. Last year, it shut down Yahoo Directory, which was the cornerstone of the company when it first was founded in 1995. Over the past two and a half years, the company has discontinued more than 60 products.
The temperature range in which most bacteria grow is between 40 degrees F (5 degrees C) and 140 degrees F (60 degrees C). Raw and cooked foods should not be kept in this danger zone any longer than absolutely necessary.
This is in reference to ambient yeast and bacterial microorganisms already present in the flour, water, air, on your hands and anything else that comes into contact with the dough. Bacterial growth, like yeast, is affected by moisture, ph, temperature, food supply, salt, sugar, oxygen supply and light. Most bacteria grow well in moist environments with temperatures ranging between 25-40C. However, some like it colder (just over freezing) and some like it hot (60-80C). Bacteria thrive at a pH around neutrality (6.5- 8.0). Most chemicals will kill bacteria. Since bacteria will not grow in mediums with large amounts of salt, salt plays a contributing factor to the leavening of sourdough bread.