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A substance that increases the effectiveness of a rubber vulcanization accelerator; for example, zinc oxide or litharge.
A trace quantity of a substance that imparts luminescence to crystals; for example, silver or copper in zinc sulfide or cadmium sulfide pigments.
A molecule that modifies a repressor in a way that enables it to stimulate operon transcription.
(graphic arts)


1. A substance which accelerates a chemical reaction but appears to remain unchanged itself.
2. A hardener that accelerates cure of adhesives either with or without heat. Used primarily with synthetic resins.
References in periodicals archive ?
An activator and/or wipe-off can be added to confuse the opponents.
Some are activators, turning genes on and some are repressors, turning genes off.
In flotation deinking, a surfactant (typically a fatty acid or soap), an activator (calcium), and the ink particles interact to promote attachment of ink particles to rising air bubbles.
Like a small green bin, it is buried in the garden so only the (child-resistant) lid is showing and a biological activator is inserted.
She, however, favors a model in which the newfound RNA's attachment to NRSF/REST causes the protein to detach from the genes it represses rather than to change into a gene activator.
Plasminogen activator inhibitor-1 is a major determinant of arterial thrombosis resistance.
Speech technology company 20/20 Speech has released its Aurix Activator for Microsoft Windows-based PDAs.
The ERK-deficient JB6 cells are characterized as deficient in inducible activator protein-1 (AP-1) transcriptional activity, a response that is rescued by ERK-2 expression (7,13-15).
Software-selectable material volumes are pumped using a positive displacement pump and activator is spread through a specially-designed nose equipped with a replaceable felt pad.
Using a patented inductive detection technology, the NCPS sensors sense the position of a steel activator that is attached to the sensed assembly.
a provider of service activation and performance management software to global telecommunications network operators, has announced a series of significant enhancements to its award winning Service Activator software.
19, 2015 /PRNewswire/ --Summary DelveInsight's, Plasminogen Activator Inhibitors-1 (PAI-1)- Pipeline Insights, 2015, provides the in-depth analysis of the pipeline assets across the Plasminogen Activator Inhibitors-1 (PAI-1).

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