Results 241 to 250 of about 587,836 (298)
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IAA detection in humic substances
Soil Biology and Biochemistry, 1998The aim of the work was to verify if humic substances conaine auxin component able to justify its biological activity. To this aim various preparations of anti-IAA antibodies were used. Quantitative determinations of IAA in HS was corried out using an enzyme immunoassay, Phytodetek-IAA.
MUSCOLO A, CUTRUPI S, NARDI, SERENELLA
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Effects of pollution on humic substances
Journal of Environmental Science and Health, Part B, 1980To assess effects of industrial and environmental pollution on analytical characteristics of humic substances, we isolated humic acids (HA's) and fulvic acids (FA's) from unpolluted and polluted soils and sediments. Following purification, the HA's and FA's were characterized by elemental (C, H, O, N, S) and functional group (CO2H, phenolic OH, total ...
M, Schnitzer, H, Kerndorff
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Protein Encapsulation by Humic Substances
Environmental Science & Technology, 2011Protein encapsulation by natural organic matter is hypothesized to preserve the activity of proteins in terrestrial and aquatic environments. Direct molecular-level evidence for encapsulation of net positively charged proteins lysozyme, trypsin, and ribonuclease A by a diverse set of humic substances (HS) in nanostructured films was collected using a ...
Tomaszewski JE +2 more
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Antiandrogenic activity of humic substances
Science of The Total Environment, 2012For long, natural organic matter (NOM) composed mainly of humic substances (HS) were regarded as inert in the ecosystems with respect to their possible chemical interaction with exposed organisms. However recently, NOM have been shown to elicit various adverse effects generally attributed to synthetic xenobiotics, including estrogenic effects ...
Michal, Bittner +2 more
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Adsorption of Glyphosate by Humic Substances
Journal of Agricultural and Food Chemistry, 1996Four humic substances were extracted from a peat (HA1) and a volcanic soil (HA2), an oxidized coal (HA3), and a lignite (HA4). The four humic materials presented distinct differences in their chemical and physical−chemical characteristics as assessed by chemical methods, 13C-NMR spectroscopy, and high-performance size exclusion chromatography.
A. PICCOLO, CELANO, Giuseppe, P. CONTE
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Removal of humic substances by biosorption
Journal of Environmental Sciences, 2008Fungal pellets of Aspergillus niger 405, Aspergillus ustus 326, and Stachybotrys sp. 1103 were used for the removal of humic substances from aqueous solutions. Batchwise biosorption, carried out at pH 6 and 25 degrees C, was monitored spectrophotometrically and the process described with Freundlich's model.
Vuković Domanovac, Marija +2 more
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Involvement of humic substances in regrowth
International Journal of Food Microbiology, 2004There appear to be interactions in the distribution system that complicate the ability to use AOC/BDOC as an independent assessment of regrowth potential. Two such complications are the limitation of the assays themselves and the potential interaction between the organic carbon concentration with the presence of disinfectants and pipe materials.
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Human lung injury following exposure to humic substances and humic-like substances
Environmental Geochemistry and Health, 2017Among the myriad particles the human respiratory tract is exposed to, a significant number are distinctive in that they include humic substances (HS) and humic-like substances (HULIS) as organic components. HS are heterogeneous, amorphous, organic materials which are ubiquitous occurring in all terrestrial and aqueous environments.
Andrew J. Ghio, Michael C. Madden
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Humic Substances and Plant Nutrition
1995Since the studies by Liebig (1856), it is well known that plants, as long as they are adequately supplied with light and mineral nutrients, can live in the absence of the organic and inorganic structural components of the soil. Nowadays the use of hydroponics is popular not only among plant physiologists but also in certain commercial activities.
VARANINI, Zeno, R. PINTON
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On the nature of humic substances
Eurasian Soil Science, 2015It is argued that the isolation of low-molecular-weight compounds from humic substances does not prove their supramolecular nature, because small molecules can be sorbed on macromolecules by interacting with them due to noncovalent bonds. The relative mobility of molecular segments in humic substances has been proposed to be used as a criterion for the
G. N. Fedotov, S. A. Shoba
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