Hevea


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Hevea

[′hē·vē·ə]
(botany)
The rubber tree genus of the order Euphoriales from which the largest volumes of latex are harvested for use in the manufacture of natural rubber.

Hevea

 

a genus of evergreen monoecious trees of the Euphorbiaceae family.

There are approximately 12 species of Hevea, found in the forests of tropical America. H. brasiliensis is the principal source of natural rubber; it grows wild in the damp tropical forests of the Amazon valley and is widely cultivated in tropical countries (most notably in Ceylon, the Malacca Peninsula, and the Greater Sunda Islands). The height of the tree is 30-40 m; the leaves are compound ternate and the blossoms small, unisexual, and gathered into paniculate inflorescences with capsular fruit. The seeds are oval and large (up to 3 cm) with a heavy brown casing, and quickly lose their germinating capacity. The milky sap of the plants contains the rubber, for which the trees are tapped from the age of 10-12 years. One tree may yield from 3-4 to 7.5 kg of rubber per year.

REFERENCES

Tekhnologiia rastitel’nogo kauchuka i guttaperchi. Moscow, 1944.
Zhukovskii, P. M. Kul’turnye rasteniia i ikh sorodichi, 2nd ed. Leningrad, 1964. Pages 760-63.
Siniagin, I. I. Tropicheskoe zemledelie. Moscow, 1968. Pages 245-53.

S. S. MORSHIKHINA

References in periodicals archive ?
Identification of profilin as an IgE-binding component in latex from Hevea brasiliensis: Clinical implications.
sleeveless top, pounds 75, and cycling shorts, pounds 55, both from Hevea.
Clinical tests on 65 people allergic to Hevea latex products produced no skin reactions to guayule latex.
EL caucho, Hevea brasiliensis, es la fuente de la materia prima de innumerables productos que generan un gran impacto en el desarrollo industrial, economico y social, siendo utilizado como materia prima industrial, bien sea de forma liquida latex de caucho o en forma de caucho seco, para la manufactura de un gran numero de productos indispensables para la sociedad, desde guantes industriales y quirurgicos, mangueras, calzado, adhesivos, accesorios para autos, hasta su aplicacion mas prioritaria como neumaticos para todo tipo de transporte [1].
Latex from Hevea brasiliensis (rubber tree) increased angiogenic activity and promoted esophagus regeneration in dogs (Mrue, 1997).
Hevea brasiliensis (hule) es una especie arborea de la familia Euphorbiaceae de rapido crecimiento, que alcanza alturas menores a 25 m en plantaciones y mas de 40 m en bosque natural, es nativa de la cuenca amazonica, con distribucion silvestre en Bolivia, Brasil, Colombia, Peru y Venezuela (Orwa et al.
In this work, One-Factor-at-A-Time (OFAT) method and Central Composite Design (CCD) under Response Surface Methodology (RSM) were used to improve the purification of LAH enzyme from the skim latex serum of Hevea brasiliensis.
Clones de Hevea brasiliensis, RRIM600, GT1 e PR255, obtidos da empresa Polifer S/A, localizada em Macaubal, Sao Paulo, foram plantados em vasos com capacidade para 10L contendo solo devidamente adubado com NPK e mantidos em ambiente aberto localizado no Departamento de Producao Vegetal--Setor de Defesa Fitossanitaria, na Faculdade de Ciencias Agronomicas--UNESP, Campus de Botucatu, sob condicoes de campo, temperatura media entre 12,9 e 24,2[degrees]C, umidade relativa de 46,2% e molhadas com agua da torneira sempre que necessario.
The Hevea panda teether is made from 100% natural, sustainablyproduced rubber, pounds 8.
George (1993) observou que a embriogenese poderia ser induzida mais efetivamente em calos derivados de anteras de Hevea brasiliensis Muell Arg.