what is the basic difference between production of yoghurt and bread with respect to the microbes used.
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Answer:
Micro-organisms have been used since ancient times to make bread, cheese, yoghurt and wine. Food manufacturers continue to use micro-organisms today to make a wide range of food products by a process known as fermentation. Fermentation not only gives food a good taste, texture and smell, but it causes changes that reduce the growth of unwanted food microbes. This improves the food’s storage life and safety. Nowadays fermentations are used to make an amazingly wide range of food and drink.
A yeast called Saccharomyces cerevisiae is mixed with sugar, flour and warm water to make bread. The yeast uses the sugar and the sugars present in the flour as its food. It breaks them down to provide the yeast with energy for growth. The yeast grows by budding. As it does this bubbles of the gas carbon dioxide are produced in the dough.
Yoghurt is a fermented milk product in which milk is inoculated with a starter culture containing two different types of 'lactic acid bacteria' called Streptococcus thermophilus and Lactobacillus bulgaricus. First the milk is heated to a very high temperature of 85–95°C for 15–30 minutes. This kills off any unwanted microbes that may be present
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