History of the San Andreas Fault, Gaspar de Portola, Andrew Lawson, Alfred Wegener and Harry Hess. The San Andreas fault is about 28 million years old. Back then, California didn't exist, at least not recognizably so. Bits and pieces could be found scattered around the western edge of North American, which at the time ended at the Pacific ocean lapping the shores of central Utah and Arizona.
Sourdough bread is made by the fermentation of dough using naturally-occurring lactobacilli and yeast. Sourdough bread has a mildly sour taste not present in most breads made with baker's yeast, due to the lactic acid produced by the lactobacilli.ourdough is a dough containing a Lactobacillus culture in symbiotic combination with yeasts. It is one of the principal means of biological leavening in bread baking, the others using cultivated forms of yeast.
As discussed, we have analysed the microflora of the sourdough of your bakery on Salt Spring Island in the last weeks. The analysis was done by Dr. Clarissa Schwab, who is working as a post doctoral fellow my lab.altose (which is the most abundant carbohydrate in dough) is the preferred carbohydrate source. Furthermore, virtually all strains of L. rossiae and L. spicheri will use the sucrose that is present in wheat flour (about 10 g / kg) or added as part of the dough formula to produce acetic acid instead of ethanol.