Amino Nitrogen of Soils and of Certain Fractions Isolated From Them

Sowden, F. J.; Parker, Doreen I.

doi:10.1097/00010694-195309000-00004

Cited by 21 publications

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“…The finding that no free amino groups can be detected in humie acid preparations by the FDNB technique is in agreement with recent work by Sowden & Parker (1953) and Okuda & Hori (1954). The result obtained by this technique appears more reasonable than that given by the Van Slyke method and is to be expected if, as Waksman & Iyer (1932) have postulated, the humic fraction of soil organic matter is a ligno-protein complex in which the free amino groups in the protein material are combined with carbonyl groups in the lignin.…”

Section: Discussionsupporting

confidence: 93%

Studies on soil humic acids II: Observations on the estimation of free amino groups. Reactions of humic acid and lignin preparations with nitrous acid

Bremner

1957

J. Agric. Sci.

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The work reported in the first paper in this series (Bremner, 1955 a) showed that a considerable fraction (20-48 %) of the nitrogen in humic acid preparations from different soils was in the form of amino-acid polymers and that a smaller fraction (3-10 %) was in the form of amino sugars. The object of the work reported in the present paper was to determine how much of the nitrogen in soil humic acids occurs as free amino groups, this information being required for the evaluation of theories regarding the chemical nature of soil humic acids and Preliminary results of this work have already appeared (Bremner, 1952). EXPERIMENTALThe humic acid preparations employed were isolated from 0-5 M-sodium hydroxide and 0-1 M-sodium pyrophosphate (pH 7-0

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Section: Discussionsupporting

confidence: 93%

Studies on soil humic acids II: Observations on the estimation of free amino groups. Reactions of humic acid and lignin preparations with nitrous acid

Bremner

1957

J. Agric. Sci.

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“…P L D soil, w i t h o u t p l a n t s -control. [16][17][18][19][20][21][22]. H e a l t h y p l a n t s of the 7 c o t t o n strains grown in P L D soil.…”

Section: Design O/the Experimentsmentioning

confidence: 99%

Amino acids in root exudates of cotton

Sulochana

1962

Plant Soil

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Zum Stickstoffgehalt in Huminsäuren‐Literaturübersicht

Witthauer

1976

Acta hydrochim. hydrobiol.

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Huminsäuren sind Bestandteile natürlicher Oberflächenwässer unterschiedlicher Herkunft und können organische und anorganische Wasserinhaltsstoffe binden.Die Kenntnis des Huminsäurestickstoffs ist eine der Voraussetzungen für die Untersuchung der Funktion von Huminsäuren in Wässern. In der Arbeit wird ein Überblick über den gegenwärtigen Kenntnisstand des Huminsäurestickstoffs, seine Entstehung und seine Beeinflussung durch Nichthuminstoffe gegeben. Dabei werden die Stickstoffverbindungen Ammoniumstickstoff, Aminosäuren, Aminozucker, Peptide und Proteine, die direkte Bindung des Stickstoffs am aromatischen Kern und der heterocyclische Stickstoff in Huminsäuren ebenso wie die Bindungen des Huminsäurestickstoffs an Tonmineralien und die Adsorption organischer stickstoffhaltiger Verbindungen an Huminsäuren näher erläutert.

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Amino Nitrogen of Soils and of Certain Fractions Isolated From Them

Cited by 21 publications

References 0 publications

Studies on soil humic acids II: Observations on the estimation of free amino groups. Reactions of humic acid and lignin preparations with nitrous acid

Studies on soil humic acids II: Observations on the estimation of free amino groups. Reactions of humic acid and lignin preparations with nitrous acid

Amino acids in root exudates of cotton

Zum Stickstoffgehalt in Huminsäuren‐Literaturübersicht

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