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Khaya Formation
''Khaya'' is a genus of five tree species in the mahogany family Meliaceae. The timber of ''Khaya'' is called African mahogany, and is valued as a substitute to American mahogany (of the genus ''Swietenia''). Description The genus is native to tropical Africa and Madagascar. All species grow to around 30–35m tall, rarely 45m, with a trunk over 1m diameter, often buttressed at the base. The leaves are pinnate, with 4-6 pairs of leaflets, the terminal leaflet absent; each leaflet is 10–15 cm long abruptly rounded toward the apex but often with an acuminate tip. The leaves can be either deciduous or evergreen depending on the species. The flowers are produced in loose inflorescences, each flower small, with four or five yellowish petals and ten stamens. The fruit is a globose four or five-valved capsule 5–8 cm diameter, containing numerous winged seeds. Species *''Khaya anthotheca'' (syn. ''K. nyasica'') *''Khaya grandifoliola'' *''Khaya ivorensis'' *''Khaya madagasca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adrien-Henri De Jussieu
Adrien-Henri de Jussieu (23 December 1797 – 29 June 1853) was a French botanist. Born in Paris as the son of botanist Antoine Laurent de Jussieu, he received the degree of Doctor of Medicine in 1824 with a treatise of the plant family (biology), family Euphorbiaceae. When his father retired in 1826, he succeeded him at the Jardin des Plantes; in 1845 he became professor of organography of plants. He was also president of the French Academy of Sciences. De Jussieu was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1850. His main publications were the ''Cours élémentaire de botanique'' (Paris) and the ''Géographie botanique'' (Paris, 1846), as well as several monographs, most notably the one on the family Malpighiaceae. In botanical references he is usually abbreviated as Adr. Juss., also sometimes as A. Juss., as his father already has the abbreviation Juss. The asteroid 9470 Jussieu was named in honor of the de Jussieu family. In 1825 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Khaya Anthotheca
''Khaya anthotheca'', with the common name East African mahogany, is a large tree species in the Meliaceae family, native to tropical Africa. The name ''anthotheca'' was taken from the Greek word ''anthos'', meaning flower, while ''theca'' refers to a capsule. It is known by a number of other common names, including Nyasaland, red or white mahogany. Oos-Afrikaanse mahonie is the Afrikaans name and acajou is its name in French. Distribution It is widespread, occurring from Guinea Bissau east to Uganda and Tanzania, and south to Angola, Zambia, Zimbabwe and Mozambique. It is fairly widely grown in plantations within its natural area of distribution, but also in South Africa, tropical Asia and tropical America. It is easily confused with other ''Khaya'' species like '' K. grandifoliola'', '' K. senegalensis'' or '' K. ivorensis'' in the north of its natural range. Habitat The East African mahogany grows in medium to low altitude areas in evergreen forests. They require damp lands ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Termite
Termites are small insects that live in colonies and have distinct castes (eusocial) and feed on wood or other dead plant matter. Termites comprise the infraorder Isoptera, or alternatively the epifamily Termitoidae, within the order Blattodea (along with cockroaches). Termites were once classified in a separate order from cockroaches, but recent phylogenetic studies indicate that they evolved from cockroaches, as they are deeply nested within the group, and the sister group to wood eating cockroaches of the genus ''Cryptocercus''. Previous estimates suggested the divergence took place during the Jurassic or Triassic. More recent estimates suggest that they have an origin during the Late Jurassic, with the first fossil records in the Early Cretaceous. About 3,106 species are currently described, with a few hundred more left to be described. Although these insects are often called "white ants", they are not ants, and are not closely related to ants. Like ants and some bees a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Makoro
A mokoro (also spelled ''makoro'', Setswana-English-Setswana Dictionary, Macmillan Botswana, 4th edition) is a type of canoe commonly used in the Okavango Delta and on the Chobe River in Botswana. It is propelled through the shallow waters of the delta or the river by standing in the stern and pushing with a pole, in the same manner as punting. The plural in Setswana is ''mekoro''. Mokoro are traditionally made by digging out the trunk of a large straight tree, such as ebony and African sausage tree. Modern mokoros, however, are increasingly made of fiberglass, one of the advantages of which is the preservation of large trees. Mokoro safaris are a popular way for tourists to visit the delta and river, much of which is located in protected areas, but the boats are still a practical means of transport for local residents to use to move around the swamp. The boats are very vulnerable to attack by hippopotamus, which can overturn them with ease. Hippopotamus are reputed to have de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dugout Canoe
A dugout canoe or simply dugout is a boat made from a hollowed tree. Other names for this type of boat are logboat and monoxylon. ''Monoxylon'' (''μονόξυλον'') (pl: ''monoxyla'') is Greek – ''mono-'' (single) + '' ξύλον xylon'' (tree) – and is mostly used in classic Greek texts. In German, they are called Einbaum ("one tree" in English). Some, but not all, pirogues are also constructed in this manner. Dugouts are the oldest boat type archaeologists have found, dating back about 8,000 years to the Neolithic Stone Age. This is probably because they are made of massive pieces of wood, which tend to preserve better than others, such as bark canoes. Along with bark canoes and hide kayaks, dugouts were also used by Indigenous peoples of the Americas. Construction Construction of a dugout begins with the selection of a log of suitable dimensions. Sufficient wood must be removed to make the vessel relatively light in weight and buoyant, yet still strong enough to supp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oleic Acid
Oleic acid is a fatty acid that occurs naturally in various animal and vegetable fats and oils. It is an odorless, colorless oil, although commercial samples may be yellowish. In chemical terms, oleic acid is classified as a monounsaturated omega-9 fatty acid, abbreviated with a lipid number of 18:1 ''cis''-9, and a main product of Δ9 desaturase. It has the formula CH3(CH2)7CH=CH(CH2)7COOH. The name derives from the Latin word ''oleum'', which means oil. It is the most common fatty acid in nature. The salts and esters of oleic acid are called oleates. Occurrence Fatty acids (or their salts) often do not occur as such in biological systems. Instead fatty acids such as oleic acid occur as their esters, commonly triglycerides, which are the greasy materials in many natural oils. Oleic acid is the most common monounsaturated fatty acid in nature. It is found in fats (triglycerides), the phospholipids that make membranes, cholesterol esters, and wax esters. Triglycerides of oleic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stearic Acid
Stearic acid ( , ) is a saturated fatty acid with an 18-carbon chain. The IUPAC name is octadecanoic acid. It is a waxy solid and its chemical formula is C17H35CO2H. Its name comes from the Greek word στέαρ "''stéar''", which means tallow. The salts and esters of stearic acid are called stearates. As its ester, stearic acid is one of the most common saturated fatty acids found in nature following palmitic acid.Gunstone, F. D., John L. Harwood, and Albert J. Dijkstra "The Lipid Handbook with Cd-Rom. 3rd ed. Boca Raton: CRC Press, 2007. , The triglyceride derived from three molecules of stearic acid is called stearin. Occurrence and production Stearic acid is more abundant in animal fat (up to 30%) than in vegetable fat (typically <5%). The important exceptions are the foods (34%) and [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palmitic Acid
Palmitic acid (hexadecanoic acid in IUPAC nomenclature) is a fatty acid with a 16-carbon chain. It is the most common saturated fatty acid found in animals, plants and microorganisms.Gunstone, F. D., John L. Harwood, and Albert J. Dijkstra. The Lipid Handbook, 3rd ed. Boca Raton: CRC Press, 2007. , Its chemical formula is CH3(CH2)14COOH, and its C:D (the total number of carbon atoms to the number of carbon-carbon double-bonds) is 16:0. It is a major component of the oil from the fruit of oil palms ( palm oil), making up to 44% of total fats. Meats, cheeses, butter, and other dairy products also contain palmitic acid, amounting to 50–60% of total fats. Palmitates are the salts and esters of palmitic acid. The palmitate anion is the observed form of palmitic acid at physiologic pH (7.4). Occurrence and production Palmitic acid was discovered by Edmond Frémy in 1840, in saponified palm oil. This remains the primary industrial route for its production, with the triglycerides (fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Khaya Senegalensis
''Khaya senegalensis'' is a species of tree in the Meliaceae family that is native to Africa. Common names include African mahogany, dry zone mahogany, Gambia mahogany, khaya wood, Senegal mahogany, ''cailcedrat'', ''acajou'', ''djalla'', and ''bois rouge''. Description African mahogany is a fast-growing medium-sized tree which can obtain a height of up to 15–30 m in height and 1 m in diameter. The bark is dark grey to grey-brown while the heartwood is brown with a pink-red pigment made up of coarse interlocking grains. The tree is characterised by leaves arranged in a spiral formation clustered at the end of branches. The white flowers are sweet-scented; the fruit changes from grey to black when ripening. Distribution and habitat The tree is native to Benin, Burkina Faso, Cameroon, Central African Republic, Chad, Ivory Coast, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Mali, Niger, Nigeria, Senegal, Sierra Leone, Sudan, Togo, and Uganda. It is found in ripari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Khaya Madagascariensis
''Khaya madagascariensis'' is a species of plant in the family Meliaceae. It is found in Comoros and Madagascar. Description ''Khaya madagascariensis'' is an evergreen tree which grows 13 to 24 meters tall. Range and habitat ''Khaya madagascariensis'' is native to Madagascar and Comoros. Its historic range includes the Northern and Central Highlands of Madagascar in the former provinces of Antsiranana, Fianarantsoa, Mahajanga, Toamasina and Toliara, and on the islands of Grande Comore and Mohéli and near Koni-Djodjo on Anjouan in the Comoros. It is known from 12 locations, and its estimated extent of occurrence (EOO) is 262,803 km2, and the estimated area of occupancy (AOO) is 56 km2. Its natural habitat is dry and humid forest, from 5 to 1,000 meters elevation. Conservation and threats There are currently 14 wild subpopulations, with an estimated population of 1,400 mature individuals among them. The species was over-exploited for its timber, and many wild subpopulations ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Khaya Ivorensis
''Khaya ivorensis'', also called African mahogany or Lagos mahogany, is a tall forest tree with a buttressed trunk in the family Meliaceae. It is found in Angola, Cameroon, Côte d'Ivoire, Gabon, Ghana, Liberia, and Nigeria where it grows primarily in lowland tropical rainforests. It is threatened by habitat loss. ''Khaya ivorensis'' is a species in the African mahogany family. Other common names are Gold Coast mahogany, Ivory Coast mahogany, Nigerian mahogany. It grows to be about 40–50 m high. It has thick and reddish brown bark. It grows many white flowers at the end of its branches. Its woody fruit is slightly thinner than those of ''Khaya grandifoliola ''Khaya grandifoliola'', also called African mahogany, Benin mahogany, large-leaved mahogany, or Senegal mahogany, is a species of plant in the family Meliaceae. It is found in Benin, the Democratic Republic of the Congo, Ivory Coast, Ghana, Guin ...''. Distribution and habitat ''Khaya ivorensis'' typically grows in drie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Khaya Grandifoliola
''Khaya grandifoliola'', also called African mahogany, Benin mahogany, large-leaved mahogany, or Senegal mahogany, is a species of plant in the family Meliaceae. It is found in Benin, the Democratic Republic of the Congo, Ivory Coast, Ghana, Guinea, Nigeria, Sudan, Togo, and Uganda. It is threatened by habitat loss. Medical uses In many malaria endemic countries, like the tropics, the extract of ''Khaya grandifoliola'' is used as an antimalarial herbal remedy. Recent studies show that 90% of malaria cases around the world come from sub-Saharan Africa. People in these areas resort to medicinal plants for treatment because alternative medical resources are often low or unavailable. The bark and seeds of ''Khaya grandifoliola'' are the most common parts used for treatment and are extracted by infusion or decoction. The extracts have proven to fight against the '' P. falciparum'' parasite, one of the vectors of malaria in humans. Crude water extracts of ''Khaya grandifoliola'' have s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
