coli, as facultative anaerobes, can carry out both aerobic respiration and menaquinone-mediated anaerobic respiration. == History == In 1929, Danish scientist Henrik Dam investigated the role of cholesterol by feeding chickens a cholesterol-depleted diet.
Dam and Doisy shared the 1943 Nobel Prize for medicine for their work on vitamin K1 and K2 published in 1939.
Several laboratories synthesized the compound(s) in 1939. For several decades, the vitamin K–deficient chick model was the only method of quantifying vitamin K in various foods: the chicks were made vitamin K–deficient and subsequently fed with known amounts of vitamin K–containing food.
Dam and Doisy shared the 1943 Nobel Prize for medicine for their work on vitamin K1 and K2 published in 1939.
When recommendations were last updated in 1998, sufficient information was not available to establish an estimated average requirement or recommended dietary allowance, terms that exist for most vitamins.
For vitamin K labeling purposes, 100% of the daily value was 80 μg, but on 27 May 2016 it was revised upwards to 120 μg, to bring it into agreement with the highest value for adequate intake.
Compliance with the updated labeling regulations was required by 1 January 2020 for manufacturers with US$10 million or more in annual food sales, and by 1 January 2021 for manufacturers with lower volume food sales.
Compliance with the updated labeling regulations was required by 1 January 2020 for manufacturers with US$10 million or more in annual food sales, and by 1 January 2021 for manufacturers with lower volume food sales.
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