Tham khảo tài liệu 'tự điển food science, technology and nutrition - vần q,r', nông - lâm - ngư, nông nghiệp phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 399 initial product of protein glycation to the advanced glycation end-product potentially useful in preventing the adverse effects of poor glycaemic control in diabetes mellitus. pyridoxal pyridoxamine pyridoxine See vitamin B6. 4-pyridoxic acid The main urinary metabolite of vitamin b6. pyridoxyllysine A schiff base formed by condensation between pyridoxal and the e-amino group of lysine in proteins. Renders both the vitamin b6 and the lysine unavailable and also has antivitamin b6 antimetabolic activity. pyrimidines Nitrogenous bases that occur in nucleic acids cytosine thymine and uracil. PYRIMIDINES pyrithiamin Antimetabolite of thiamin used in experimental studies of vitamin Bi deficiency it inhibits thiamin pyrophosphokinase EC and competes for uptake across the blood-brain barrier accumulating in the central nervous system. See also oxythiamin. pyrocarbonate See diethyl pyrocarbonate. pyrosis Alternative name for heartburn USA . See indigestion. pyrroles Derivatives of five-membered heterocyclic compounds C4H4NH that impart a burnt flavour to foods mainly formed by the maillard reaction. pyruvic acid An intermediate in the metabolism of carbohydrates formed by the anaerobic glycolysis of glucose. It may then either be converted to acetyl CoA and oxidised through the citric acid cycle or be reduced to lactic acid. The oxidation to acetyl CoA is thiamin dependent and blood concentrations of pyruvate and lactate rise in thiamin deficiency. Q QPM Quality protein maize. QUAC stick Quaker arm circumference measuring stick. A stick used to measure height which also shows the 80th and 85th 400 centiles of expected mid-upper arm circumference. Developed by a Quaker Service Team in Nigeria in the 1960s as a rapid and simple tool for assessment of nutritional status. See also anthropometry. quahog American bivalve mollusc Venus mercenaria. quail Formerly a game bird now so endangered in the wild that shooting is prohibited but farmed to some extent. Two main .
