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Good thesis starters

Sourdough bread is good thesis starters by the fermentation of dough using naturally occurring lactobacilli and yeast.

Sourdough 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. In the Encyclopedia of Food Microbiology, Michael Gaenzle writes: «The origins of bread-making are so ancient that everything said about them must be pure speculation. Sourdough remained the usual form of leavening down into the European Middle Ages until being replaced by barm from the beer brewing process, and then later purpose-cultured yeast. Europe, is usually leavened with sourdough.

Baker’s yeast is not useful as a leavening agent for rye bread, as rye does not contain enough gluten. French bakers brought thesis techniques to Northern California during the Good Gold Rush, and it remains a part of the culture of San Francisco today. The sourdough tradition was carried into Alaska and the western Canadian territories during the Klondike Gold Rush of 1898. Conventional leavenings such as yeast and starters soda were much less reliable in the conditions faced by the prospectors.

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In English-speaking countries, where wheat-based breads predominate, sourdough is no longer the standard method for bread leavening. It was gradually replaced, first by the use of barm from beer making, then, after the confirmation of germ theory by Louis Pasteur, by cultured yeasts. Manufacturers of non-sourdough breads make up for the lack of yeast and bacterial culture by introducing into their dough an artificially-made mix known as bread improver or flour improver. Flour naturally contains a variety of yeasts and bacterial spores.

Obtaining a satisfactory rise from sourdough takes longer than a dough leavened with baker’s yeast because the yeast in a sourdough is less vigorous. In the presence of lactic acid bacteria, however, some sourdough yeasts have been observed to produce twice the gas of baker’s yeast. As it ferments, sometimes for several days, the volume of the starter is increased by periodic additions of flour and water, called «refreshments». As long as this starter culture is fed flour and water regularly it will remain active. The ratio of fermented starter to fresh flour and water is critical in the development and maintenance of a starter. This ratio is called the refreshment ratio.

General Perspective on the Role of Theory in Qualitative Research.
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