1956
DOI: 10.1002/jpln.19560750204
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Über das Vorkommen von Indolverbindungen in Schwarzerde-Huminsäuren. Vorläufige Mitteilung

Abstract: Heft 21 Scheffer, Ulrich und Hiertermann, Hydrothermalsynthese S c h r i f t t u m(1) Brernner, /. M.:

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“…Bremncr (16) and others have investigated the nature of the nitrogen compounds and have found that up to 75% of the nitrogen may be amino-acid (presumably from bound protein material) and glycosamines. On the other hand, some humic acids contain up to 75% unhydrolyzable nitrogen; in these acids, the element appears to have been irreversibly incorporated into the macromolecule and to exist in heterocyclic moieties (17) . Interest in the nature of the fixed nitrogen is based on the possible role of humic acid as a denitrifying agent in the soil.…”
Section: Addition Of Polyphenol Solutionmentioning
confidence: 99%
“…Bremncr (16) and others have investigated the nature of the nitrogen compounds and have found that up to 75% of the nitrogen may be amino-acid (presumably from bound protein material) and glycosamines. On the other hand, some humic acids contain up to 75% unhydrolyzable nitrogen; in these acids, the element appears to have been irreversibly incorporated into the macromolecule and to exist in heterocyclic moieties (17) . Interest in the nature of the fixed nitrogen is based on the possible role of humic acid as a denitrifying agent in the soil.…”
Section: Addition Of Polyphenol Solutionmentioning
confidence: 99%