acetic acid acid alaska amish friendship bread amylase ancient egyptian cuisine bacteria baguette baking powder barm beer bran bread bread improver bread machine california gold rush carbon dioxide cioppino citric acid cracker barrel desem dough europe flour fructose glucose gluten klondike gold rush lactic acid lactobacillus lactobacillus sanfranciscensis leavening agent levain louis pasteur maltase maltose mascot middle ages milk northern california ph pancake panettone potassium bromate potato pumpernickel quick bread rye saccharomyces cerevisiae salt rising bread sourdough sam starch sucrose sugar symbiosis water wheat wikibooks yeast