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Define Criteria for Assessment of Pyridoxine Status?
Vitamin B6 status is most appropriately evaluated by using a combination of indicators, namely plasma PLP concentration, urinary excretion, erythrocyte aminotransferases activity coefficients, tryptophan catabolites, erythrocyte and whole blood PLP concentration, and plasma homocysteine concentration, including those considered as direct indicators (e.g. vitamer concentration in cells or fluids) and those considered to be indirect or functional indicators (e.g. erythrocyte aminotransferases saturation by PLP or tryptophan metabolites). Plasma PLP may be the best single indicator because it appears to reflect tissue stores. A plasma PLP concentration of 20 m mol/M has been proposed as an index of adequacy based on recent findings. Plasma PLP levels have been reported to fall with age. Urinary 4-pyridoxic acid level responds quickly to changes in vitamin B6 intake and is therefore of questionable value in assessing status. However, a value higher than 3 m mol/day, achieved with an intake of approximately mg/day, as been suggested to reflect adequate intake. Erythrocyte aminotransferases for aspartate and alanine are commonly measured before and after addition of PLP to ascertain amounts of apoenzymes, the proportion of which increases with vitamin B6 depletion. Values of 1.5-1.6 for the aspartame aminotransferase and approximately 1.2 for the alanine aminotransferase have been suggested as being adequate. Catabolites from tryptophan and methionine have also been used to assess vitamin B6 status. In a review of the relevant literature, Leklem suggested that a 24-hour urinary excretion of less than 65 normal xanthurenate after a 2g oral dose of tryptophan indicates normal vitamin B6 status.
Define the Materials Used in Perforation Repair 1- Barrier material: Restorable barrier. UN Restorable barrier 2- Function of barriers: provide m
Procaryotic Structure and Diversity The first organisms which did not have well defined nucleus, called procaryotes, (pro = earlier, caryon = nucleus) were probably anaerobic a
Explain the Storage of vitamin A? The primary organ for storage of vitamin A is the liver. Reserves are found in the stellate cells, as mentioned above. The average liver weigh
THEOR Y OF GERMPLASM - August Weismann (1834-1914) criticized the inheritance of acquired characters by putting forward the theory of continuity of germplasm. According
Explain Chemical Formulas and Reactions? Chemical Formulas and Reactions : Molecules formed by the chemical bonding of atoms are described by chemical formulas. If energy
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Explain primary structure of proteins The primary structure of a protein having of the order in which amino acids are bonded to one another by a peptide bond.
Penicillin allergy Cefazolin is often used for prophylaxis in penicillin-allergic patients, but such patients rarely may have allergic reactions to cephalosporins. When allergy
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BUCCAL CAVITY - Situated between upper & lower jaw. It is lined by stratified squamous epithelium. Separated from nasal chamber by palate. Palate forms roof of buccal cav
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