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D&C-
Prefix meaning that a dye is FDA-approved for drugs and
cosmetics.
Dairy-
When used as a descriptive term for food, refers exclusively to milk and milk products.
Diagnostic Horizons-
Horizons having specific soil characterstics that are indicative of certain classes of soils. e.g. Chernozemic soils are characterised by a humic A horizon (Ah or Ahe), Solonetzic soils by a solonetzic B horizon (Bn, Bnt etc.)
Denitrification-
Biochemical reduction of nitrate to nitrite or gaseous nitrogen (N2 or NOx). Can be an important loss mechanism for soil nitrogen in waterlogged soils.
Dietary fibre-
In scientific terms, dietary fibre is a mixture of components derived from plant cell wall material and non-structural polysaccharides, as well as non-starch polysaccharides added to foods. It includes non-digestible polysaccharides such as cellulose, hemicelluloses, gums, pectins, mucilages and lignin. From a nutrition point of view, some authorities also include 'resistant starch' (i.e. starch that is resistant to enzymic degradation, usually as a result of processing).
Diffusion-
The random movement of atoms, molecules or ions due to thermal excitation. Can occur in gases and solutions.
Drift-
Material moved from one place to another by geological processes such as glaciation.
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