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Possible definitions for oopak

-->Bouaké

City (pop., 1988: 330,000), central Ivory Coast. It was established as a French military post in 1899 on the road and railroad line from Abidjan to Burkina Faso (then, Upper Volta). Bouaké is among the nation's largest cities and is the commercial and transportation hub of the interior.


Conakry
Capital (regional pop., 1995 est.: 1,508,000), largest city, and chief Atlantic port of Guinea. Located on Tombo Island and the Kaloum Peninsula, it was founded by the French in 1884. It became the capital successively of the protectorate of Riviè res du Sud (1891), the colony of French Guinea (1893), and independent Guinea (1958). Tombo Island, the site of the original settlement, is linked to the peninsula by a causeway. The city was industrialized in the 1950s with the development of iron mining and bauxite production. It is the seat of the Univ. of Conakry (founded 1962).


dopa
Organic chemical (L-3,4-dihydroxyphenylalanine) from which the body makes dopamine, a neurotransmitter deficient in persons with parkinsonism. Large daily doses of dopa can lessen the effects of the disease. However, it becomes less effective over time and causes abnormal involuntary movements (dyskinesia).


dopant
Any impurity added to a semiconductor to modify its electrical conductivity. The most common semiconductors, silicon and germanium, form crystalline lattices in which each atom shares electrons with four neighbors (see bonding). Replacing some atoms with "donor" atoms (e.g., phosphorus, arsenic) that have five bonding electrons makes extra electrons available. The semiconductor thus doped is called n-type (for negative, because of the additional negative charge). Doping with "acceptor" atoms (e.g., gallium), with only three electrons available, creates a positively charged lattice defect; conduction can occur by migration of this "hole" through the crystal structure of such a p-type (for positive) semiconductor.


oak
Any of about 450 species of ornamental and timber trees and shrubs that make up the genus Quercus in the beech family, found throughout temperate climates. Oaks are deciduous trees that bear spring catkins (male flowers) and spikes (female flowers) on the same tree. The leaves have lobed, toothed, or smooth margins. The fruit is the acorn. They are hardy and long-lived shade trees. White oaks have smooth leaves and rapidly germinating sweet acorns; red, or black, oaks have bristle-tipped leaves and bitter, hairy acorns. Red- and white-oak lumber is used in construction, flooring, furniture, millwork, barrel making, and the production of crossties, structural timbers, and mine props. The genus includes many ornamentals and natural hybrids.


opal
A hydrated, noncrystalline silica mineral used extensively as a gemstone. Its chemical composition is similar to that of quartz but generally with a variable water content. Pure opal is colorless, but ...

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