Typical costs: Having a contractor level and prepare the area then pour a concrete slab ranges from $1,000-$2,000 for a 10x20-feet; $4,000-$6,000 for 80x20-feet; and $5,000-$10,000 for 100x100-feet. Smaller projects cost more per square yard because of minimum travel, labor and equipment costs.
What makes yogurt - well, yogurt? The words live and active cultures refer to the living organisms, Lactobacillus bulgaricus and Streptococcus thermophilus, which convert pasteurized milk to yogurt during fermentation. Note that the milk is pasteurized before culturing to remove any harmful bacteria.
As friendly bacteria populate a culture of yogurt, they create several acids as a by-product of respiration and metabolism. According to the University of Guelph four major acids contribute to the taste and acidity of yogurt. These include lactic acid, acetaldehyde, acetic acid and diacetyl acid.