Results 211 to 220 of about 3,612 (259)
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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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Humic substances as surfactants
Environmental Chemistry Letters, 2009Humic substances from soils and sediments can be defined as surface active substances based on the surface tension measurements. Although there are several micellar structural models of humic substances currently available, few studies evaluating humic substances as surfactants have been conducted to date.
Maris Klavins, Oskars Purmalis
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THE SUPRAMOLECULAR STRUCTURE OF HUMIC SUBSTANCES
Soil Science, 2001The scientific understanding of the molecular size and shape of humic substances (HS) is critically reviewed. The traditional view that HS are polymers in soil is not substantiated by any direct evidence but is assumed only on the basis of laboratory experiments with model molecules and ...
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THE PRINCIPLES OF HUMIC SUBSTANCES
Soil Science, 2001Two principles are presented that define the molecular nature and ecological role of humic substances (HS). The First Principle (i) accounts for and organizes an extensive body of apparently disparate data relating to the inability to purify and establish a molecular structure for HS; (ii) offers a conceptual framework for dealing with HS and for ...
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Characteristics of humic substance in lake sediments: The case of lakes in northeastern China
Journal of Hydrology, 2021Zimin Wei, Longji Zhu
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