perturbation

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perturbation

[pur′tərbā′shən]
Etymology: L, per + tubare, to disturb
a cause or a condition of disturbance, disorder, or confusion.

per·tur·ba·tion

(pĕrtŭr-bāshŭn)
In physical therapy, an external force applied to a person's center of mass in an attempt to move it from the base of support

perturbation

(pĕr″tĕr-bā′shŭn) [L. perturbare, thoroughly disordered]
1. The state of being greatly disturbed or agitated; uneasiness of mind.
2. A disturbance or a change in a structure or function, usually as a result of an external influence.

perturbation,

n a small disturbance that tips a metastable system over into disorder and chaos.
References in periodicals archive ?
The researchers found, among other discoveries, that benzene may perturb cell cycling that is mediated by the gene for the protein p53, triggering a host of fatal problems at the cellular level and thus causing blood cell malignancies epigenetically (that is, without encoding the information in the genetic code).
Quietly and without proselytizing, the protagonists of the easy-does-it apocalypse perturb our enshrinement of urban angst and nonconformity.
Cheung found that, for the most part, shutting off sensory input from the muscles did not perturb the synergies involved in natural jumping and swimming movements.
Ultra-wideband offers the ideal solution to the home market, because objects, walls, furniture or people -- even if directly in the path of the two devices -- won't perturb the video stream," said Dr.
Because small fish, larvae, and other prey perturb the electric fields around the field-generating fish, voltage-sensitive cells in their skin can detect the objects.
Driven by increasing snowmelt and rains, this trend, if it continues, could perturb the northern temperate and arctic climate, argues Bruce J.
Though plants need nitrogen to grow, a new study finds that even small additions of this fertilizing pollutant can perturb the landscape.