Pará rubber tree

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Pará rubber tree

(pärä`), large tree (Hevea brasiliensis) of the family Euphorbiaceae (spurgespurge
, common name for members of the Euphorbiaceae, a family of herbs, shrubs, and trees of greatly varied structure and almost cosmopolitan distribution, although most species are tropical. In the United States the family is most common in the Southeast.
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 family), native to tropical South America and the source of the greatest amount and finest quality of natural rubberrubber,
any solid substance that upon vulcanization becomes elastic; the term includes natural rubber (caoutchouc) and synthetic rubber. The term elastomer is sometimes used to designate synthetic rubber only and is sometimes extended to include caoutchouc as well.
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. Today most Pará rubber is produced from trees grown on plantations in Asia and to a lesser extent in Africa. The yellow or white latex from which rubber is made occurs in numerous specialized latex vessels in the bark, especially outside the phloem. The tree is tapped by making careful incisions, as deep as possible without injuring the tree's growth, in a herringbone pattern or often in a lefthand spiral of 30° around the trunk, for the latex vessels spiral to the right at an angle of about 30° from the horizontal. The latex is collected in small cups and then treated—usually by coagulating it with acid, pressing it free of water, and drying the resultant sheets in a smokehouse to ready them for shipment. The size of the tree, the quality of the latex, and the number of taps possible varies with individual trees; the quantity of latex increases with the age of the tree, which may grow to a height of over 100 ft (30 m). Cultivated trees are tapped throughout the year, usually in the early morning, when the latex flow is greatest. Sometimes other trees that yield latex are also called Pará rubber trees. Pará rubber trees are 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 Euphorbiales, family Euphorbiaceae.
References in periodicals archive ?
An outstanding work has been done by Brazilian researchers (10-17), (19) through the monitoring and evaluation of the technological properties of NR from clones of Hevea brasiliensis along the months of the year.
Poly(1,4-c/s-isoprene) samples were studied, from Hevea brasiliensis (HNR) and Parthenium argentatum (GR), and from Ziegler-Natta catalysis.
Composition of Lipids in Latex of Hevea Brasiliensis Clone RRIM 501.
The natural rubber latex (NR) obtained from the Hevea brasiliensis trees (12) is essentially composed by poly cis-1, 4-isoprene, besides proteins, amino acids, carbohydrates, lipids, and nucleic acids (12), (13).
The examination gloves made with patented Yulex(R) natural rubber, and cleared by the FDA, do not contain proteins associated with allergic reactions to latex products from Hevea brasiliensis, and are naturally Hevea latex-free.
Natural latex from the Brazilian rubber plant, Hevea brasiliensis, has one serious drawback.
Natural rubber latex is a product of the rubber tree Hevea brasiliensis, which originated in the Amazon.
Right now, these and some 40,000 other rubber products are derived only from the tropical Brazilian rubber tree, Hevea brasiliensis.
That title belongs to Hevea brasiliensis, which is the primary rubber-producing species in the world.
These results indicate that proteins present in production lots of Guayule latex are not cross-reactive with Hevea brasiliensis latex allergens.