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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)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
A total of 12 participiates of both genders (six boys and six girls of the sample) used the Wunderer's activator and a face mask with average age of 8.50 [+ or -] 2.35 years.
Real-time PCR was used to determine relative quantities of mitochondrial DNA content in H9c2 cells exposed to t-BHP and cells incubated with SIRT1 activators. Cells were preincubated for 24 h with ginsenoside [Rb.sub.2], ginsenoside F1, ginsenoside Rc, and schisandrin A at final concentrations (20 [micro]M) before being exposed to t-BHP (300 [micro]M) for 1h.
Class II malocclusions successfully treated with either an activator or extraoral traction were compared to untreated controls by Baumrind and associates [25,26].
The major event behind atherosclerosis is inhibition of fibrinolysis due to increased plasminogen activator inhibitor-1 (PAI-1) levels, indicator of ineffective fibrinolysis.
Dano, "Urokinase-type plasminogen activator: proenzyme, receptor, and inhibitors," Journal of Cell Biology, vol.
Activator 1000 Odor Control Lemon Lime Formula was being exclusively offered to return customers and those who placed their orders by phone, however its popularity forced the company to release the odor control product on
In their review, the authors conclude that there is benefit to the use of the Activator Adjusting Instrument (AAI) for patients with spinal pain and trigger points.
The project is being supervised by Anthony Walker-Senior, who is the YMCA's vRugby Activator, a1s well as a member of the senior squad who himself came up through the club's junior ranks.

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