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07-SEPTEMBER-2008 03:17:44 - Latex For other uses, see latex disambiguation. May 2007 The extraction of latex from a tree; latex is used in rubber production The extraction of latex from a tree; latex is used in rubber production Latex refers generically to a stable dispersion emulsion of polymer microparticles in an aqueous medium. Latexes may be natural or synthetic. Latex as found in nature is the milky sap of many plants that coagulates on exposure to air. It is a complex emulsion in which proteins, alkaloids, starches, sugars, oils, tannins, resins and gums are found. In most plants, latex is white, but some have yellow, orange, or scarlet latex. The word is also used to refer to natural latex rubber; particularly for non-vulcanized rubber. Such is the case in products like latex condoms and latex clothing. It can also be made synthetically by polymerizing a monomer that has been emulsified with surfactants. The term latex is attributed to Charles Marie de la Condamine, which is derived from lac, the Latin word for milk.1 Contents 1 Sources 2 Natural function of latex 3 Uses of latex 4 Latex clothing 5 Allergic reactions 6 Notes 7 External links Sources The cells or vessels in which latex is found make up the laticiferous system, which forms in two very different ways. In many plants, the laticiferous system is formed from rows of cells laid down in the meristem of the stem or root. The cell walls between these cells are dissolved so that continuous tubes, called latex vessels, are formed. This method of formation is found in the poppy family, in the rubber trees Para rubber tree and Castilla elastica, and in the Cichorieae, a section of the Family Asteraceae distinguished by the presence of latex in its members. Dandelion, lettuce, hawkweed and salsify are members of the Cichorieae. It is also present in another member of the Asteraceae, the guayule plant. In the milkweed and spurge families, on the other hand, the laticiferous system is formed quite differently. Early in the development of the seedling latex cells differentiate, and as the plant grows these latex cells grow into a branching system extending throughout the plant. In the mature plant, the entire laticiferous system is descended from a single cell or group of cells present in the embryo. The laticiferous system is present in all parts of the mature plant, including roots, stems, leaves, and sometimes the fruits. It is particularly noticeable in the cortical tissues. Several members of the fungal kingdom also produce latex upon injury. Notable are the milk-caps such as Lactarius deliciosus. Natural function of latex This article or section is missing citations or needs footnotes. Using inline citations helps guard against copyright violations and factual inaccuracies. May 2008 Rubber latex Rubber latex Many plant functions have been attributed to latex. Some regard it as a form of stored food, while others consider it an excretory product in which waste products of the plant are deposited. Still others believe it functions to protect the plant in case of injuries; drying to form a protective layer that prevents the entry of fungi and bacteria. Similarly, it may provide some protection against browsing animals, since in some plants latex is very bitter or even poisonous. It may be that latex fulfills all of these functions to varying degrees in the numerous plant species in which it occurs. Uses of latex The latex of many species can be processed to produce other materials. Natural rubber is the most important product obtained from latex; more than 12,000 plant species yield latex containing rubber, though in the vast majority of those species the rubber is not suitable for commercial use.2. Latex is also used as a binding agent in latex paint. Balatá and gutta percha latex contain an inelastic polymer related to rubber. Latex from the chicle and jelutong trees is used in chewing gum. Poppy latex is a source of opium and its many derivatives. Latex may also be used in different brands of condoms Latex is used in different brands of catheters Latex is also used in the Medical field for the making of gloves Latex clothing Main article: Latex clothing Latex is used in many types of clothing. It is different from rubber in that it is less refined and often thinnercitation needed. Worn on the body or applied directly by painting it tends to be skin-tight, producing a second skin effect. It has a shinier finish than rubber. Allergic reactions Main article: Latex allergy Some people have a serious latex allergy, and exposure to latex products such as latex gloves can cause anaphylactic shock. Guayule latex is hypoallergenic and is being researched as a substitute to the allergy-inducing Hevea latexes. Some allergic reactions are not from the latex but from residues of other ingredients used to process the latex into clothing, gloves, foam, etc. These allergies are usually referred to as multiple chemical sensitivity MCS. Notes ^ Untitled Document ^ Bowers, J.E. 1990. Natural Rubber-Producing Plants for the United States. Beltsville, MD: National Agricultural Library, pp. 1,3. OCLC 28534889. External links Latex allergies Wikimedia Commons has media related to: Latex Retrieved from http://en..org/wiki/Latex Categories: Materials | Sculpture materials | Nonwoven fabricsHidden categories: Articles lacking sources from May 2007 | All articles lacking sources | Articles with statements since May 2008 | All articles with statements | Articles with statements since January 2008 Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages БългарÑ?ки Català Česky Dansk Deutsch Español Esperanto Français Bahasa Indonesia Italiano Lëtzebuergesch Nederlands 日本語 ‪Norsk bokmÃ¥l‬ Polski Português РуÑ?Ñ?кий Simple English SlovenÄ?ina Suomi Svenska ไทย Türkçe УкраїнÑ?ька This page was last modified on 8 August 2008, at 04:00
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