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Lactase is an enzyme that some people are unable to produce in their small intestine. [2] Technology to produce lactose-free milk, ice cream, and yogurt was developed by the USDA Agricultural Research Service in 1985. [3]
The majority of humans actually follow this protocol as well, and down-regulate lactase production around 3-5 years of age. Interestingly, though, the majority of caucasians, mainly those from northern european background, continue to have elevated lactase activity all the way into adulthood, and so they exhibit “lactase persistence”.
Lactase enzymes similar to those produced in the small intestines of humans are produced industrially by fungi of the genus Aspergillus. The enzyme, β-galactosidase, is available in tablet form in a variety of doses, in many countries without a prescription. It functions well only in high-acid environments, such as that found in the human gut ...
Lactase persistence is a textbook example of natural selection in humans: it has been reported to present stronger selection pressure than any other known human gene. [24] However, the specific reasons as to why lactase persistence confers a selective advantage "remain open to speculation".
Many adult humans lack the lactase enzyme, which has the same function as β-galactosidase, so they are not able to properly digest dairy products. β-Galactose is used in such dairy products as yogurt, sour cream, and some cheeses which are treated with the enzyme to break down any lactose before human consumption. In recent years, β ...
Since puppies drink their mother's milk, their bodies produce lactase, an enzyme that helps them digest the lactose sugars found in milk. Once they are weaned, however, they stop producing this ...
Download QR code; In other projects ... Diagram showing the enzymatic hydrolysis of lactose to D-galactose and D-glucose by the action of the enzyme lactase. Date: 31 ...
Environmentalist Ellen Swallow Richards was the first woman admitted to the Massachusetts Institute of Technology, an impressive feat in and of itself.What's even more admirable was her work in science, a field in which women faced many obstacles, as well as the time she spent getting her Ph.D. in chemistry from MIT– well, almost.