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Gutta-percha
Gutta-percha is a tree of the genus '' Palaquium'' in the family Sapotaceae. The name also refers to the rigid, naturally biologically inert, resilient, electrically nonconductive, thermoplastic latex derived from the tree, particularly from '' Palaquium gutta''; it is a polymer of isoprene which forms a rubber-like elastomer. The word "gutta-percha" comes from the plant's name in Malay: ''getah'' translates as " latex". ''Percha'' or ''perca'' is an older name for Sumatra. Description ''P. gutta'' trees are tall and up to in trunk diameter. The leaves are evergreen, alternate or spirally arranged, simple, entire, long, glossy green above, and often yellow or glaucous below. The flowers are produced in small clusters along the stems, each flower with a white corolla with four to seven (mostly six) acute lobes. The fruit is an ovoid berry, containing one to four seeds; in many species, the fruit is edible. In Australia, gutta-percha is a common name specifically use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Submarine Communications Cable
A submarine communications cable is a cable laid on the sea bed between land-based stations to carry telecommunication signals across stretches of ocean and sea. The first submarine communications cables laid beginning in the 1850s carried telegraphy traffic, establishing the first instant telecommunications links between continents, such as the first transatlantic telegraph cable which became operational on 16 August 1858. Subsequent generations of cables carried telephone traffic, then data communications traffic. Modern cables use optical fibre technology to carry digital data, which includes telephone, Internet and private data traffic. Modern cables are typically about in diameter and weigh around for the deep-sea sections which comprise the majority of the run, although larger and heavier cables are used for shallow-water sections near shore. Submarine cables first connected all the world's continents (except Antarctica) when Java was connected to Darwin, Northern T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Montgomerie
William Montgomerie (1797–1856) was a Scottish military doctor with the East India Company, and later head of the medical department at Singapore. He is best known for promoting the use of gutta-percha in Europe. This material was an important natural rubber that made submarine telegraph cables possible. Montgomerie was involved in spice cultivation as head of the Singapore botanical experimental gardens and at his personal estate in Singapore. The latter never became economically viable, but he received a Society of Arts gold medal for nutmeg cultivation. He was also responsible for building the first lunatic asylum in Singapore. Montgomerie died at Barrackpore in India a few years after taking part in the Second Anglo-Burmese War as Superintendent Surgeon. Early life and family Montgomerie was born in Scotland in 1797. In 1827, he married Elizabeth Graham in Calcutta. A son is mentioned in a newspaper article. His brother was Major-General Sir P. Montgomerie of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palaquium Gutta - Köhler–s Medizinal-Pflanzen-099
''Palaquium'' is a genus of about 120 species of trees in the family Sapotaceae. Their range is from India across Southeast Asia, Malesia, Papuasia, and Australasia, to the western Pacific Islands. Description Within their range, ''Palaquium'' species are mostly found in the Philippines and Borneo. In Borneo, many species are recorded in the Malaysian states of Sabah and Sarawak. The leaves are typically spirally arranged and often clustered near twig ends. Flowers are mostly bisexual, though some unisexual instances are known. Fruits are one- or two-seeded with rare instances of several seeds. ''Palaquium'' habitats are coastal, lowland mixed dipterocarp, swamp, and montane forests. Some species, for example ''Palaquium gutta'', are well known for producing gutta-percha Gutta-percha is a tree of the genus '' Palaquium'' in the family Sapotaceae. The name also refers to the rigid, naturally biologically inert, resilient, electrically nonconductive, thermoplastic latex d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Excoecaria
''Excoecaria'' is a plant genus of the family Euphorbiaceae, formally described by Linnaeus in 1759. The genus is native to the Old World Tropics ( Africa, southern Asia, northern Australia, and assorted oceanic islands). Etymology Genus name, ''Excoecaria'', is from the Latin word ''excaeco'', which means "to blind" and refers to the sap of the plants that can cause temporary blindness. Toxic latex The milky latex of '' Excoecaria agallocha'', also known as ''Thillai'', milky mangrove, blind-your-eye mangrove and river poison tree, is poisonous. Mangroves of this plant surround the ancient Thillai Chidambaram Temple in Tamil Nadu. Contact with skin can cause irritation and rapid blistering; contact with eyes will result in temporary blindness. It is distributed in the Pichavaram wetlands, near Chidambaram India, in Australia from northern New South Wales, along the northern coastline around to Western Australia.The latex is extremely poisonous. Even dried and powde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Tradescant The Younger
John Tradescant the Younger (; 4 August 1608 – 22 April 1662), son of John Tradescant the Elder, was a botanist and gardener. The standard author abbreviation Trad. is applied to species he described. Biography Son of John Tradescant the Elder, he was born in Meopham, Kent, and educated at The King's School, Canterbury. Like his father, who collected specimens and rarities on his many trips abroad, he undertook collecting expeditions to Virginia between 1628 and 1637 (and possibly two more trips by 1662, though Potter and other authors doubt this). Among the seeds he brought back, to introduce to English gardens were great American trees, including magnolias, bald cypress and tulip tree, and garden plants such as phlox and asters. John Tradescant the Younger added his American acquisitions to the family's cabinet of curiosities, known as The Ark. These included the ceremonial cloak of Chief Powhatan, an important Native American relic. South Lambeth Road in Vau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Pagan Tribes Of Borneo; A Description Of Their Physical, Moral And Intellectual Condition, With Some Discussion Of Their Ethnic Relations (1912) (14598075089)
''The'' () is a grammatical article in English, denoting persons or things that are already or about to be mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is the definite article in English. ''The'' is the most frequently used word in the English language; studies and analyses of texts have found it to account for seven percent of all printed English-language words. It is derived from gendered articles in Old English which combined in Middle English and now has a single form used with nouns of any gender. The word can be used with both singular and plural nouns, and with a noun that starts with any letter. This is different from many other languages, which have different forms of the definite article for different genders or numbers. Pronunciation In most dialects, "the" is pronounced as (with the voiced dental fricative followed by a schwa) when followed by a consonant sound, and as (homophone of the archaic pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crystal
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macroscopic single crystals are usually identifiable by their geometrical shape, consisting of flat faces with specific, characteristic orientations. The scientific study of crystals and crystal formation is known as crystallography. The process of crystal formation via mechanisms of crystal growth is called crystallization or solidification. The word ''crystal'' derives from the Ancient Greek word (), meaning both " ice" and " rock crystal", from (), "icy cold, frost". Examples of large crystals include snowflakes, diamonds, and table salt. Most inorganic solids are not crystals but polycrystals, i.e. many microscopic crystals fused together into a single solid. Polycrystals include most metals, rocks, ceramics, and ice. A third ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amorphous
In condensed matter physics and materials science, an amorphous solid (or non-crystalline solid, glassy solid) is a solid that lacks the long-range order that is characteristic of a crystal. Etymology The term comes from the Greek language, Greek ''a'' ("without"), and ''morphé'' ("shape, form"). In some older articles and books, the term was used synonymously with glass. Today, "glassy solid" or "amorphous solid" is considered the overarching concept. Polymer, Polymers are often amorphous. Structure Amorphous materials have an internal structure comprising interconnected structural blocks that can be similar to the basic structural units found in the corresponding crystalline phase of the same compound. Unlike crystalline materials, however, no long-range order exists. Localized order in amorphous materials can be categorized as short or medium range order. By convention, short range order extends only to the nearest neighbor shell, typically only 1-2 atomic spacings. Me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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