The experimental set yogurt showed a reduction of the ph of the ...... ........ Which of the two types of microorganisms. Lactobacillus and Streptavidin growing stable of models that grow well at temperatures of forty to forty-five degrees Celsius reaction involved in the organization's symbol is. Lactobacillus helps digest protein in the milk of the bacteria Streptavidin growing stable of models are encouraged to grow and to change the sugar lactose in milk to lactic acid during yoghurt. Start with about 5 ph and to stimulate the growth of Lactobacillus bacteria, resulting in this acid ph until reduced to about 4 to 4.2, but for trial ph down from the little maybe. caused by yeast into it, and the right temperature.