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- W2078488567 abstract "The 10,000 g supernatant of wax-stimulated whole saliva was fractionated by gel filtration and its components were tested along with amino acids, small peptides and urea for their ability to stimulate this oxygen uptake, and for their effects on pH. Fractions containing the larger components, the proteins and large peptides, stimulated much less oxygen uptake than unfractionated supernatant, and caused a small decrease in pH. Analysis with anthrone indicated that both these effects were due mainly to the carbohydrate associated with these constituents. In contrast, fractions containing the remaining lower molecular-weight components stimulated substantial oxygen uptake and a rise in pH; both effects were like those seen with whole saliva supernatant. The oxygen effects were attributed mainly to certain amino acids and small peptides in the small molecular-weight fractions. Ornithine, arginine, proline and glutamic acid consistently stimulated oxygen uptake by the oral microflora in a test of 23 amino acids with the sediments of 13 subjects. Ornithine and arginine at the same time stimulated a significant rise in pH, whereas the other two amino acids showed no such effect. Variable and sometimes significant oxygen uptake was seen with alanine, aspartic acid, asparagine, glutamine and cysteine in 4–7 of the subjects; infrequent or no effects were seen with the remainder of the amino acids tested. There was some evidence to suggest that amino acid stimulation of oxygen uptake may be inducible. Urea had no effect on uptake but did contribute significantly to the pH rise. Small peptides containing those amino acids that could stimulate oxygen uptake also stimulated such uptake; peptides without such acids did not. It was concluded that certain amino acids, mainly present as residues of hydrolysable peptides and proteins, are the source of most of the oxidizable substrate in saliva. The remainder appears to be due to the carbohydrate associated with certain salivary proteins and large peptides." @default.
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- W2078488567 date "1990-01-01" @default.
- W2078488567 modified "2023-09-27" @default.
- W2078488567 title "Constituents of salivary supernatant responsible for stimulation of oxygen uptake by the bacteria in human salivary sediment" @default.
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- W2078488567 doi "https://doi.org/10.1016/0003-9969(90)90176-b" @default.
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