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Age and origin of the source material determine the chemical structure of humic substances. In general, humic substances derived from soil and peat (which takes hundreds to thousands of years to form) have higher molecular weight, higher amounts of O and N, more carbohydrate units, and fewer polyaromatic units than humic substances derived from ...
Chemical structure, physicochemical properties, human health and ecotoxicological data curated "PPDB". 2000 [10] Probes and Drugs ProCarDB Prokaryotic Bacterial Carotenoid DataBase IMTECH: spectra references "ProCarDB". 1800 PubChem: National Library of Medicine National Center for Biotechnology Information from 748 data sources
Expansive clay, also called expansive soil, is a clay soil prone to large volume changes (swelling and shrinking) directly related to changes in water content. [1] Soils with a high content of expansive minerals can form deep cracks in drier seasons or years; such soils are called vertisols.
A soil family category is a group of soils within a subgroup and describes the physical and chemical properties which affect the response of soil to agricultural management and engineering applications. The principal characteristics used to differentiate soil families include texture, mineralogy, pH, permeability, structure, consistency, the ...
chemical file format An MDL Molfile is a file format for holding information about the atoms, bonds, connectivity and coordinates of a molecule. The molfile consists of some header information, the Connection Table (CT) containing atom info, then bond connections and types, followed by sections for more complex information.
The word "oxisol" comes from "oxide" in reference to the dominance of oxide minerals such as bauxite. In the World Reference Base for Soil Resources , oxisols are known as ferralsols . Occurrence
Most research on anthropogenic soils describes specific aspects of their biology, chemistry or physical properties, cultural heritage and human geography, erosion, wastes, pollution, fertilizer management, and taxonomy. Very few of them, [3] [4] [5] try to answer to the question: How fast do they start pedogenesis (viz., differentiating horizons)?
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