Results 291 to 300 of about 102,757 (351)
In-vitro study of hybrid silver nanoparticles with humic acid extracted from cow dung against pathogens. [PDF]
HeliyonDharejo SA +4 more
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Exploring the impact of fulvic acid and humic acid on heavy metal availability to alfalfa in molybdenum contaminated soil. [PDF]
Sci RepWang M, Song G, Zheng Z, Mi X, Song Z.
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Study on the Removal of Humic Acid from Road Tunnel Drainage Systems Based on Electric Field-Enhanced Co(II)-Mediated Peroxymonosulfate System. [PDF]
ACS OmegaLv J +7 more
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Extraction and chemical characterization of humic acid produced from lignite coals of arid region of Gujarat, Western India. [PDF]
Sci RepRani J, Kumari S, Paul B.
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Soil Science, 1959
Summary Paper and column chromatography using partition and ion‐exchange conditions, high‐ and low‐voltage paper electrophoresis, and gelatine‐gel diffusion have all been used in an attempt to fractionate humic acids, but only limited success is recorded.
C. B. COULSON +2 more
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Summary Paper and column chromatography using partition and ion‐exchange conditions, high‐ and low‐voltage paper electrophoresis, and gelatine‐gel diffusion have all been used in an attempt to fractionate humic acids, but only limited success is recorded.
C. B. COULSON +2 more
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Nature, 1963
THE idea that humic acids are heteropolycondensates1 of phenolic substances with or without the participation of amino-acids is now widely accepted. Three possible sources of the phenols are postulated: (1) phenolic materials such as flavonoids leached from the plant debris; (2) phenolic units formed during the decomposition of lignin; (3) phenolic ...
A, BURGES +4 more
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THE idea that humic acids are heteropolycondensates1 of phenolic substances with or without the participation of amino-acids is now widely accepted. Three possible sources of the phenols are postulated: (1) phenolic materials such as flavonoids leached from the plant debris; (2) phenolic units formed during the decomposition of lignin; (3) phenolic ...
A, BURGES +4 more
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Plant and Soil, 1972
An explanation has been advanced for the previously reported observation that alkaline hydrolysis of humic acids will release amino acids that are resistant to acid hydrolysis. It is thought that under the alkaline conditions oxidation of N-phenyl-amino acids to the more readily hydrolysed quinonimines occurs.
T. J. Piper, A. M. Posner
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An explanation has been advanced for the previously reported observation that alkaline hydrolysis of humic acids will release amino acids that are resistant to acid hydrolysis. It is thought that under the alkaline conditions oxidation of N-phenyl-amino acids to the more readily hydrolysed quinonimines occurs.
T. J. Piper, A. M. Posner
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Tetrahedron, 1967
Abstract The action of water and acids on “humic acid” (HA) is described, and it is concluded that HA is a complex of a polycyclic aromatic “core” responsible for the ESR spectrum which is attached to polysaccharides, proteins, relatively simple phenols and metals.
M.V. Cheshire +4 more
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Abstract The action of water and acids on “humic acid” (HA) is described, and it is concluded that HA is a complex of a polycyclic aromatic “core” responsible for the ESR spectrum which is attached to polysaccharides, proteins, relatively simple phenols and metals.
M.V. Cheshire +4 more
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Tetrahedron, 1967
Abstract Alkaline solutions of “humic acid” (HA) isolated from some eighty different soils and peats give ESR spectra indicative of the presence of remarkably stable semiquinone ion radicals. The type of spectrum is largely determined by the pH of the soil but not by the age of the soil or the nature of the plant cover, and the examination of the HA ...
N.M. Atherton +3 more
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Abstract Alkaline solutions of “humic acid” (HA) isolated from some eighty different soils and peats give ESR spectra indicative of the presence of remarkably stable semiquinone ion radicals. The type of spectrum is largely determined by the pH of the soil but not by the age of the soil or the nature of the plant cover, and the examination of the HA ...
N.M. Atherton +3 more
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Tetrahedron, 1971
Abstract The synthesis is described of quinones containing α-amino acid ester substituents and the structure of the products is established by NMR and mass spectroscopic techniques. Hydrolysis of the products with 6N HCl has been studied; the products behave as vinylogous amides but the release of nitrogen in the form of amino acid is low ...
P.A. Cranwell, R.D. Haworth
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Abstract The synthesis is described of quinones containing α-amino acid ester substituents and the structure of the products is established by NMR and mass spectroscopic techniques. Hydrolysis of the products with 6N HCl has been studied; the products behave as vinylogous amides but the release of nitrogen in the form of amino acid is low ...
P.A. Cranwell, R.D. Haworth
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