Perturbation of biological system (Biology)

Perturbation or perturb may refer to any of numerous concepts in several fields:


 * Perturbation theory, mathematical methods that give approximate solutions to problems that cannot be solved exactly
 * Perturbation (geology), changes in the nature of alluvial deposits over time
 * Perturbation (astronomy), alterations to an object's orbit caused by gravitational interactions with other bodies
 * Perturbation theory (quantum mechanics), a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one
 * Perturbation (biology), an alteration of the function of a biological system, induced by external or internal mechanisms
 * Perturbation (economic), an alteration of the function of an economic system, induced by external or internal mechanisms
 * Perturbation (machine learning), making changes in the dataset to (re)learn a classifier (used in bagging and boosting).