stimulation of activity in an organism or chemical

Chemical. Treatment of a substance by heat, radiation, or other activating reagent to produce a more complete or rapid chemical or physical change. Electrical. The process of treating a cathode to increase its rate of reduction.

In mutagenicity testing, the exposure of the tested chemical to a source of enzymes, e.g., liver microsomes, which metabolize the chemical. The metabolic products may exhibit mutagenic activity where the original chemical did not.

The changing of a passive surface of a metal to a chemically active state. Contrast with passivation..

The process of transferring an enterprise bean from secondary storage to memory. (See passivation.)

the process in which a drug is stimulated to undergo a chemical change so that it can react with its target; see degradation

Increasing of a surface's reactivity by removal or conversion of inactive substances on the surface. Examples are the removal of metal oxide films or the formation of polar groups on polyolefins. Activation is often a necessary precondition for a subsequent coating process for the warranty of sufficient wetting or adhesion of the coating. The most versatile method is plasma activation. Aside plasma activation, there are methods like flaming, corona pre-treating system, or chemical activation baths.

The loss of passivity on the surface of a solid.