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Using neutral red pH indicator, the agar distinguishes those Gram-negative bacteria that can ferment the sugar lactose (Lac+) from those that cannot (Lac-)fermentation. This medium is also known as an indicator medium and a low selective medium. Presence of bile salts inhibits swarming by Proteus species.
Lactase is an enzyme that breaks down lactose, the main sugar in milk. It's produced in different ways by many different types of organisms, but in humans, it's made by the cells lining the small intestines. Most people are born producing it, but often make less of it as they age, which causes lactose intolerance. This enzyme is produced commercially as a dietary supplement, but also has a range of industrial and scientific uses. Types. Many things produce this enzyme, including fungi, bacteria, and mammals. Consequently, there are many different types of lactase, which vary slightly in terms of their ideal environment, including the pH they need to live. This is one of the reasons why lactase supplements come in different forms, like pills and liquids. The type used in making pill supplements can generally live in a higher pH environment than the one used in making drops, which makes it more suitable for going directly into the acidic environment of the stomach.