Question

What are lactic acid bacteria (LAB)?

Answer 1

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Lactic acid bacteria are an order of gram-positive, low-GC, acid-tolerant, generally nonsporulating, nonrespiring, either rod-shaped or spherical bacteria that share common metabolic and physiological characteristics. 
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Answer 2

Lactic acid bacteria. ... These bacteria, usually found in decomposing plants and milk products, produce lactic acid as the major metabolic end product of carbohydrate fermentation. This trait has, throughout history, linked LAB with food fermentations, as acidification inhibits the growth of spoilage agents.