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biological controlThe natural control of one species by another, as is the use of biological pesticides.
biological controla method of pest control using natural predators (harmless to other organisms) to regulate the size of pest populations. The technique has been mainly used against arthropod pests causing economic or medical problems. For example, red spider mites (Tetranychus urticae), which are pests of glasshouse crops such as cucumbers, are routinely controlled by application of commercially available samples of predatory mites (Phytoseilus persimilis) that feed on the red spider mites, thus reducing their numbers below an economically harmful level. See also BACILLUS THURINGIENSIS.
1. pertaining to biology.
2. a medicinal preparation made from living organisms and their products; these include serums, vaccines, etc.
the physiological mechanisms which govern the rhythmic occurrence of certain biochemical, physiological and behavioral phenomena in living organisms. See also biological rhythm.
control of a parasite by making use of its natural enemies, especially other pests. The target may also be a vector or a reservoir for infection.
usually comprise a list of vital statistics about an animal or plant species, recording such things as preferred growth medium, temperature and humidity and details of the internal milieu including blood pH, normal blood electrolytes and the like.
includes the influence of all biological factors such as warmth, moisture and humidity, but also the plant ecosystem in which the animal lives and the associated populations of vertebrates and invertebrates that may compete for food and space, and may also act as reservoirs for infectious diseases.
are used for the treatment of sewage effluent. They comprise a column of stones or plastic pieces which become covered with bacteria which degrade the organic matter in the effluent.
is an estimate of the biological importance of a statistical or apparent causal association between two variables, e.g. feed supply and the occurrence of bovine acetonemia. The estimation takes into account the possible biological relationship between the two; an estimate of statistical significance would take only the mathematical relationship into account.
relationship between the amount of nutrient absorbed and the amount utilized by the body. Expressed as a percentage. Called also BV.