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Vertisols of the world A more detailed map of the global distribution of Vertisols. A vertisol is a Soil Order in the USDA soil taxonomy [1] and a Reference Soil Group in the World Reference Base for Soil Resources (WRB). [2] It is also defined in many other soil classification systems. In the Australian Soil Classification it is called ...
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.
Due to the physical and chemical properties of some clays [4] (such as the Lias Group) large swelling occurs when water is absorbed. Conversely when the water dries up these clays contract (shrink). The presence of these clay minerals is what allows soils to have the capacity to shrink and swell.
This is a relatively common infection, with over 75% of women having experienced at least one yeast infection at some point in their life. [29] Risk factors for yeast infections include recent antibiotic use, diabetes mellitus , immunosuppression, increased estrogen levels, and use of certain contraceptive devices including intrauterine devices ...
Stigmasterol is a food additive in manufactured food products in the United Kingdom and European Union. [7]It was introduced as a precursor by Percy Lavon Julian for industrial large-scale manufacture of semisynthetic progesterone, [8] [9] [10] a valuable human hormone that plays an important physiological role in the regulatory and tissue rebuilding mechanisms related to estrogen effects, as ...
From the plural form: This is a redirect from a plural noun to its singular form.. This redirect link is used for convenience; it is often preferable to add the plural directly after the link (for example, [[link]]s).
The main processes of soil formation of oxisols are weathering, humification and pedoturbation due to animals. These processes produce the characteristic soil profile.They are defined as soils containing at all depths no more than ten percent weatherable minerals, and low cation exchange capacity.
The name estrone was derived from the chemical terms estrin (estra-1,3,5(10)-triene) and ketone. The chemical formula of estrone is C 18 H 22 O 2 and its molecular weight is 270.366 g/mol. It is a white, odorless, solid crystalline powder , with a melting point of 254.5 °C (490 °F) and a specific gravity of 1.23.