active center


Also found in: Medical.

active center

[′ak·tiv ′sen·tər]
(astronomy)
A localized, transient region of the solar atmosphere in which sunspots, faculae, plages, prominences, solar flares, and so forth are observed.
(biochemistry)
A flexible portion of an enzyme that binds to the substrate and converts it into the reaction product.
In carrier and receptor proteins, the portion of the molecule that interacts with the specific target compounds.
(chemistry)
Any one of the points on the surface of a catalyst at which the chemical reaction is initiated or takes place.
References in periodicals archive ?
Contract notice: Active center selm - delivery of street furniture
During the past decade, Bahrain was the Gulf's most active center for mergers and acquisitions in the region with 20 deals consummated, followed by UAE with 19, Kuwait with 12, Qatar with 10, Oman with 7 and Saudi Arabia with one deal.
Since the only difference between the crowed cobalt complexes (CoL1 ~ CoL4) was the size of the crown ether ring (or the number of the ethyleneoxy), it could be deduced that the macrocycle effect of crown ring, which possesses special configuration, would favor oxygen molecule to approach the active center of the Co (II) complexes, and form the Co-O2 bond through its hydrophobic outer ethylene groups and orderly arranged inner aza oxa atoms.
The ACTIVE Center (2) is designed to provide a dynamic physical and virtual environment that supports active, collaborative learning; skill mastery through in-class problem solving; and laptop-based in-class laboratory activities.
He also thinks Cuba "in due course will be an active center of business in the Caribbean.
Israel's military confirmed the air raid, saying that it had targeted "an active center of terrorism" following a morning rocket attack on southern Israel which caused no casualties or damage.
LOCATED CLOSE TO SAWGRASS MALL IN VERY ACTIVE CENTER.
The full-time 4WD driveline features Mitsubishi Motors' Active Center Differential (ACD) that uses an electronically controlled multi-plate hydraulic clutch to optimally tailor front / rear drive torque vectoring to different driving conditions and deliver the best balance between steering response and traction.
In the second section of the text they describe the application of substrate-inhibitor specificity for calculation of inhibitor selectivity toward different enzymes for identification of reversible and irreversible inhibitors, as well as the use of specificity constants for molecular phylogenetic analysis of the active center of cholinesterases and esterases.
New Rochelle is undergoing a Renaissance that has seen a transformation of its downtown business district into a far more vibrant and active center.
Specially designed Bilstein monotube shocks keep all four wheels planted firmly on the ground, and an electronic active center differential along with a helical-style front limited slip differential make sure that every last horsepower is delivered to those tires.
At her active center, 700 seniors on average participate daily in enriching services, choosing among 60 classes weekly, from traditional knitting to Internet tutoring to a class on how to launch a career in TV commercials.