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rho-theta system
Science; General science
A navigation system in which one or more signals are emitted from a facility (or colocated facilities) to produce simultaneous indication of bearing and distance. Since a bearing ...
geminga
Science; General science
A nearby neutron star that emits pulsed x-rays and gamma rays, steady optical radiation, and possibly radio and optical pulsations. Since the 1970s, it has been studied at a level ...
iron metabolism
Science; General science
A nearly continuous cycle whereby iron from organic and inorganic sources is converted to form iron-porphyrin compounds, which can be utilized by the body. One such compound, ...
playa
Science; General science
A nearly level, generally dry surface in the lowest part of a desert basin with internal drainage (see illustration ). When its surface is covered by a shallow sheet of water, it ...
lawson criterion
Science; General science
A necessary but not sufficient condition for the achievement of a net release of energy from nuclear fusion reactions in a fusion reactor. As originally formulated by J. D. ...
crown gall
Science; General science
A neoplastic disease of primarily woody plants, although the disease can be reproduced in species representing more than 90 plant families. The disease results from infection of ...
neuron
Science; General science
A nerve cell: the functional unit of the nervous system. Structurally, the neuron is made up of a cell body or soma and one or more long processes: a single axon and dendrites ...
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