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Define Absorption, Storage and Elimination of ascorbic acid?
Ascorbic acid is rapidly absorbed from the intestines primarily by active transport. Simple diffusion or carrier-mediated transport may also contribute to a small extent of uptake of the vitamin from the mouth and stomach. Prior to absorption, ascorbate may be oxidized to form dehydroascorbate which is absorbed by passive diffusion or by use of glucose transporters. It passes through the portal vein to the general circulation and to all tissues. Each organ or tissue has an optimal saturation level of ascorbic acid. It is not stored to any appreciable extent in the body. The degree of absorption decreases with increased vitamin intake and varies from 16% to 98%, the average overall absorption being about 80% to 95%. Unabsorbed vitamin C may be metabolized by the intestinal flora. Pectin and zinc are a few substances that impair its absorption. Excess is excreted in urine.
Define Influence of Gardening on the Development of Botany? The influence of gardening on the development of botany may be seen in the work of John Gerard (1545-1612). Gerard p
Curdlan Curdlan, a glucan with (1→3) is produced by bacterium Alkaliqenus faecalis var. myogenes and some related bacteria. It is a tasteless, odorless white powder, which sw
Chemical Properties of Fatty Acids Esterification Like any other organic acid, fatty acids also form esters with various alcohols. An alcohol such as glycerol is reacted
What does boiling do to an enzyme? Enzymes are denatured (their shape is changed so it doesn't work) when boiled.
Why is it important for chromosomes to be condensed during mitosis and decondensed during interphase? During mitosis the major problem to be solved is the correct separation of
HISTORY ON CLASSIFICATION IN BIOLOGY
notes on butterfly
Who is known as Father of English Botany? William Turner (1515-1568), whose 'A New Herbal' printed in English appeared in 1551 (first part), 1562 (second part) and 1568 (third
Most of the water taken up by a plant passes through it and is evaporated to the atmosphere. What use is made of the tiny fraction of this water which is retained by the plant?
Cell theory is one of the four (or five) unifying concepts in the biology. The cell theory states that all the living things are composed of at least one cell and that cell is the
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