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activate

[′ak·tə‚vāt]
(electricity)
To make a cell or battery operative by addition of a liquid.
(electronics)
To treat the filament, cathode, or target of a vacuum tube to increase electron emission.
(engineering)
To set up conditions so that the object will function as designed or required.
(nucleonics)
To induce radioactivity through bombardment by neutrons or by other types of radiation.
(ordnance)
To bring into existence by official order a unit, post, camp, station, base, or shore activity which has previously been constituted and designated by name or number, or both, so that it can be organized to function in its assigned capacity.
To prepare for active service a naval ship or craft which has been in an inactive or reserve status.
(physics)
To start activity or motion in a device or material.

activate

(1) See trigger.

(2) To interact with an activation server at the time copy-protected software is installed. The install program generates a code that is sent to the activation server, which responds with an authorization code that allows the software to operate. Without the authorization code, the software generally times out.
References in periodicals archive ?
The binding of LPS to CD14/LPS-binding protein and Toll-like receptor-4 triggers multiple signal cascades that activate nuclear factor-[kappa]B and p42/44 mitogen-activated protein kinase (MAPK) and lead to the expression of proinflammatory cytokines, including TNF-[alpha] (Triantafilou and Triantafilou 2002).
This demonstrates that the actions of [E.sub.2] and BPA are mediated by NOS activation, which produces NO and activates a GC.
Although there's no direct evidence yet that menthol binds to the newfound ion channel, both research groups suggest that the chemical produces a cooling sensation by increasing the temperature threshold at which the receptor activates.
Because the soluble fraction of the particles may better penetrate the alveolar-capillary membrane and be in contact with the pulmonary vessels than the whole particles when inhaled, we determined whether the soluble fraction of UPs could activate ERK1/2 and p38 MAPK.
The drugs may simply activate a general immune response, he says.
Moreover, when the researchers exposed fat cells to lipopolysaccharide (LPS), one of the bacterial components that activates TLR4, the cells began to make a related receptor, TLR2, and to synthesize secreted immune molecules such as interleukin-6.
Additional experiments suggest that aromatase is not completely suppressed because MEHP still activates PPAR[alpha].
An agent that does not activate AP-1 or ND[kappa]B is unlikely to act as a tumor promoter.
However, all four compounds appear to bind too weakly to activate the receptor under normal conditions.
As mentioned above, [H.sub.2][O.sub.2] crosses the cell membrane and activates the intracellular domain of the EGF receptor, resulting in downstream activation of Ras, Raf, MEK, and ERK (30).
Working with cells genetically engineered to make [ARA.sub.70] and the androgen receptor, the investigators found that, in the presence of [ARA.sub.70], one form of estrogen activates some of the genes normally turned on by the receptor in response to androgen.
Binding of a peroxisome proliferator (ligand) to PPAR[Alpha] activates this nuclear hormone receptor.

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