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mackerel
Swift-moving, carnivorous, torpedo-shaped food and sport fishes of temperate and tropical seas worldwide. Mackerels (family Scombridae, order Perciformes) are 1-5.5 ft (30-170 cm) long. The common mackerel (Scomber scombrus) of the N. Atlantic and the chub mackerel (S. colias) of California and the Atlantic are economically important, as are the Indian mackerels (genus Rastrelliger) and the frigate mackerels (genus Auxis). Other species (genus Scomberomorus) are favorite game fish. The name mackerel also refers to certain shark species (see mackerel shark), tuna, and bonito.
bacteria
Group of microscopic, single-celled organisms that are prokaryotes. They may have spherical, rodlike, or spiral shapes. They inhabit virtually all environments, incl. soil, water, organic matter, and the bodies of multicellular animals. Different types are distinguished in part by the structure of their cell walls, which is determined by gram stain. Many bacteria swim by means of flagella (see flagellum). The DNA of most bacteria is found in a single circular chromosome and is distributed throughout the cytoplasm rather than contained within a membrane-enclosed nucleus. Though some bacteria can cause food poisoning and infectious diseases in humans, most are harmless and many are beneficial. They are used in various industrial processes, especially in the food industry (e.g., the production of yogurt, cheeses, and pickles). Bacteria are divided into eubacteria and archaebacteria. See also budding bacteria, coliform bacteria, cyanobacteria, denitrifying bacteria, nitrifying bacteria, sheathed bacteria, sulfur bacteria.
dace
Any of various small, slim, active freshwater fishes of the carp family (Cyprinidae). In England and Europe, the dace (Leuciscus leuciscus), a relative of the European chub, inhabits streams and rivers. It is a small-headed, silvery fish that grows to 10-12 in. (25-30 cm) long and weighs 1-1.5 lbs (0.5-0.7 kg). It lives in schools and eats plant and animal material. It is a good bait and sport fish but is not highly valued as food. In N. America, the name is applied to various small cyprinids found in creeks and bogs, mostly in the central and S U.S.
Daguerre
French inventor. Initially a scene painter for the opera, in 1822 he opened the Diorama, an exhibition of views with effects induced by changes in lighting. In 1826 J.-N. Niepce learned of Daguerre's experiments in obtaining permanent pictures by the action of sunlight, and the two became partners in the development of Niepce's heliographic process until Niepce's death in 1833. Continuing to experiment, Daguerre discovered that exposing an iodized silver plate in a camera would create a lasting image if the latent image on the plate was developed and fixed. In 1839 a description of his daguerreotype process was announced at the Academy of Sciences.
Dakar
City (pop. 1994: 785,000; metro. area ...
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