quebracho


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Related to quebracho: lignum vitae, Lignum vitæ

quebracho

(kābrä`chō), name for a tanning substance and for the trees from which it comes, chiefly the red quebracho, or quebracho colorado (Schinopsis lorentzii), of the family Anacardiaceae (sumacsumac
or sumach
, common name for some members of the Anacardiaceae, a family of trees and shrubs native chiefly to the tropics but ranging into north temperate regions and characterized by resinous, often acrid, sap.
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 family). This hardwood tree, native to the Paraguayan subtropics, supplies one of the most durable and heavy of timbers. It also provides much of the vegetable tannin for the leather industry although the populations are being depleted. The heartwood, stripped of its bark and subjected to extraction processes, is about 30% tannin. Quebracho is obtained chiefly from wild trees of the forests of the Gran Chaco of Argentina, Paraguay, and Bolivia. White quebracho (Aspidosperma quebracho-blanco) of the dogbanedogbane,
common name for some members of the Apocynaceae, a family of herbs, shrubs, and trees found in most parts of the world but especially in the tropics, where they are often climbing forms. Many species are native to or naturalized in North America.
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 family is one of the other hardwoods similarly used and is native to the same region. Red quebracho is classified in the division MagnoliophytaMagnoliophyta
, division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms. The angiosperms have leaves, stems, and roots, and vascular, or conducting, tissue (xylem and phloem).
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, class Magnoliopsida, order Sapindales, family Anacardiaceae.

Quebracho

 

the name of several subtropical species of South American trees and of their wood, bark, and tanning extracts. The species Schinopsis balansae and S. quebracho-colorado (also known as S. lorentzii) of the family Anacardiaceae have a hard heavy wood containing approximately 20 percent tannins. The bark of Aspidosperma quebracho-bianco of the family Apocynaceae contains alkaloids (the most active, yohimbine) and approximately 25 percent tannins.

quebracho

[kā′bra·chō]
(botany)
Any of a number of South American trees in different genera in the order Sapindales, but all being a valuable source of wood, bark, and tannin.
(materials)
A drilling-fluid additive used for thinning or dispersing in order to control viscosity and thixotropy; made from an extract of the quebracho tree and consisting essentially of tannic acid.
References in periodicals archive ?
Salinity tolerance in Schinopsis quebracho colorado: Seed germination, growth, ion relations and metabolic responses.
Seven days after the researchers added quebracho tannins to the manure, they found that hydrogen sulfide and methane production had been reduced more than 90 percent and that production continued to dwindle for another 3 weeks.
It also said the Argentine Federal Police filed a report regarding the actions carried out by the Quebracho group at the shipping agency on Nov.
Quebracho protested against Prince Charles's visit to Argentina in 1999.
The bark extract was made from Quebracho trees which are represented by three species in South America.
The tannin degrading strain of Aspergillus niger van Tieghem, grown at pH 5 and 30[degrees]C in a defined medium with tannins as the sole carbon and energy source, showed variable growth in tannic acid--and quebracho tannin--medium and also showed capacity to tolerate these tannins up to 150 mg [l.
1999, Effects of dietary tannic acid and quebracho tannin on growth performance and metabolic rates of common carp.
The uses of acetic acid, methanol, and quebracho as selective wetting agents have been investigated.
In July, Mosaic's single super phosphate (SSP) plant in Quebracho, Argentina began production and is expected to produce up to 240,000 tonnes of granular SSP annually.
Effect of sodium silicate and/or quebracho was also tested to disperse asphaltite flocs and to depress carbonate minerals, respectively.
Locals say that life there is as hard as the famous quebracho, or ax-breaker wood native to the region.