biological control

the control of destructive organisms by the use of other organisms, such as the natural predators of the pests

Biological Control

a system for controlling instruments, mechanisms, and devices. In biological control, various manifestations of the body’s life processes, with the exception of most voluntary movements, are used as control signals.

Bioelectric potentials generated by various excitable tissues, mechanical and acoustical phenomena accompanying the functioning of the cardiovascular system and respiration, and fluctuations in body temperature are among the processes that can be used for biological control. Systems of bioelectric control are the commonest. In these systems, the biopotentials generated by skeletal muscles, heart, brain, and nerves are amplified and processed, after which they perform the role of commands or control signals. The use of brain biopotentials made it possible to create automatic instruments to signal the onset of oxygen starvation, control the supply of anesthetics and maintain a predetermined level of anesthesia, and control an electroencephalograph in order to identify characteristic changes in the brain.

The devices controlled by the heart biopotentials are the most numerous. For example, electrocardiographic changes characteristic of certain diseases may serve as signals. One group of devices controlled by the heart biopotentials is used for purposes of diagnosis. These devices trigger signaling and recording apparatus in case of disruption of the heart beat, insufficiency of oxygen, and so on. A second group consists of devices used in therapy to trigger a cardiac pacemaker (when the normal rhythm is disrupted or contractions slow abruptly or the heart stops beating), to massage the peripheral blood vessels simultaneously with heart contractions, and to relieve the heart temporarily by means of an artificial heart.

A third important group of devices with bioelectric control is made up of active prostheses controlled by biopotentials of partly amputated, paralyzed, or completely intact muscles. While making his ordinary movements, a person controls an electromechanical or pneumatic device that causes movements in the joints of a paralyzed limb or hinges of a prosthesis. The manufacture of biologically controlled prostheses began in the 1960’s not only in the USSR but also in Great Britain and Canada (under Soviet licenses).

Biological control is also used in engineering—for example, in remote-control biomanipulators for work under water or under harmful conditions.

REFERENCES

Kobrinskii, A. E. [et al.]. “Bioelektricheskaia sistema upravleniia.” Dokl. AN SSSR, 1957, vol. 117, no. 1.
Gurfinkel’, V. S. “Bioelektricheskoe upravlenie ν meditsine.” Vestn. AMN SSSR, 1964, no. 2.

V. S. GURFINKEL’

biological control

[¦bī·ə¦läj·ə·kəl kən′trōl] (ecology) Natural or applied regulation of populations of pest organisms, especially insects, through the role or use of natural enemies. Also known as biocontrol.

biological control

The natural control of one species by another, as is the use of biological pesticides.

biological control

a 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.

单词	biological control
释义	biological control biological control n. Control of a usually nonindigenous pest by introducing an organism that is a predator, parasite, or pathogen of the pest species in its native environment. Also called biocontrol. biological control n (Biology) the control of destructive organisms by the use of other organisms, such as the natural predators of the pests biolog′ical control′ n. the control of pests by interference with their ecological status, as by introducing a natural enemy or a pathogen into the environment. Also called biocontrol. [1920–25] biological control Controlling pests by biological not chemical means, as by introducing predators or, as with flies, sterilizing males. biological control biological control the control of destructive organisms by the use of other organisms, such as the natural predators of the pests Biological Control a system for controlling instruments, mechanisms, and devices. In biological control, various manifestations of the body’s life processes, with the exception of most voluntary movements, are used as control signals. Bioelectric potentials generated by various excitable tissues, mechanical and acoustical phenomena accompanying the functioning of the cardiovascular system and respiration, and fluctuations in body temperature are among the processes that can be used for biological control. Systems of bioelectric control are the commonest. In these systems, the biopotentials generated by skeletal muscles, heart, brain, and nerves are amplified and processed, after which they perform the role of commands or control signals. The use of brain biopotentials made it possible to create automatic instruments to signal the onset of oxygen starvation, control the supply of anesthetics and maintain a predetermined level of anesthesia, and control an electroencephalograph in order to identify characteristic changes in the brain. The devices controlled by the heart biopotentials are the most numerous. For example, electrocardiographic changes characteristic of certain diseases may serve as signals. One group of devices controlled by the heart biopotentials is used for purposes of diagnosis. These devices trigger signaling and recording apparatus in case of disruption of the heart beat, insufficiency of oxygen, and so on. A second group consists of devices used in therapy to trigger a cardiac pacemaker (when the normal rhythm is disrupted or contractions slow abruptly or the heart stops beating), to massage the peripheral blood vessels simultaneously with heart contractions, and to relieve the heart temporarily by means of an artificial heart. A third important group of devices with bioelectric control is made up of active prostheses controlled by biopotentials of partly amputated, paralyzed, or completely intact muscles. While making his ordinary movements, a person controls an electromechanical or pneumatic device that causes movements in the joints of a paralyzed limb or hinges of a prosthesis. The manufacture of biologically controlled prostheses began in the 1960’s not only in the USSR but also in Great Britain and Canada (under Soviet licenses). Biological control is also used in engineering—for example, in remote-control biomanipulators for work under water or under harmful conditions. REFERENCES Kobrinskii, A. E. [et al.]. “Bioelektricheskaia sistema upravleniia.” Dokl. AN SSSR, 1957, vol. 117, no. 1. Gurfinkel’, V. S. “Bioelektricheskoe upravlenie ν meditsine.” Vestn. AMN SSSR, 1964, no. 2. V. S. GURFINKEL’ biological control [¦bī·ə¦läj·ə·kəl kən′trōl] (ecology) Natural or applied regulation of populations of pest organisms, especially insects, through the role or use of natural enemies. Also known as biocontrol. biological control biological control The natural control of one species by another, as is the use of biological pesticides. biological control a 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. ThesaurusSeebiological
随便看	hot photo interpretation report hotphotorep hot pink hockey tape hot pipe hot pixel hot plasma composition analyzer hot plasma detector hot plate hot-plate hotplate hot plate/cool plate hot plates hotplates hot plug hotplug hot plug and play hot plug controller hotplug controller driver hot plug detect hot pluggable hot plugging hot-plugging hotplugging hot-plug pci controller hot plug redundant power supply

biological control

biological control

biological control

biolog′ical control′

biological control

biological control

biological control

Biological Control

REFERENCES

biological control

biological control

biological control

biological control