Transactions have traditionally been handled manually, between brokers or counterparties. However, starting in the 1970s, a greater portion of transactions have migrated to electronic trading platforms. These may include electronic communication networks, alternative trading systems,  dark pools  and others.
Lactic acid in Food. Lactic acid is naturally present in many foodstuffs. It is formed by natural fermentation in products such as cheese, yogurt, soy sauce, sourdough, meat products and pickled vegetables.
The bacteria produce lactic acid during the fermentation of lactose. Lactose is a sugar found in milk. Lactic acid lowers the pH of the product, causes the milk proteins to thicken and gives yogurt its tart taste.