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 ?
After cross-cutting, the active center winder is accelerated in order to achieve the necessary intermediate space for the winder change.
Green plants do it with the help of a cluster of 100 to 200 chlorophyll molecules, or "antennae pigments," to harvest light energy and transfer it to an active center where the first steps of photo-synthesis occur.
Most efforts to discover ACC inhibitors have focused on interactions within the carboxyltransferase (CT) domain of the enzyme active center resulting in poor drug-like properties and have thus failed to provide benefit to patients.
Tim Duncan might be the NBA's second-best active center, but he's playing power forward and isn't subject to the nightly abuse O'Neal takes.
have found such evidence in the form of a pattern of velocities indicating a flow of matter out of the active center of that galaxy.
1995 ) and using new hot routes for the new object active center (plot no 1992/1 and 1999/1) Restaurants and Sport (p.
ICE is New York City's largest, most active center for culinary education and uses a variety of kitchen appliances multiple times a day.
Contract notice: Continuation and implementation of a business line management for the following areas: redevelopment area and active site mE-ller in berlin mitte ot wedding, redevelopment area and active center tower in downtown berlin moabit ot.
Nelson Burton, Surgical Director of Heart Transplant and Mechanical Circulatory Support and Inova Fairfax's surgical co-Principal Investigator for the BTT clinical study commented, "We are pleased to be an active center in the Levacor BTT study.
Delivery and commissioning of 850Mhz and a 600MHz NMR spectrometer for the Fourier Biomolecular active center of the Leibniz UniversitEnt Hannover.
Super-All Wheel Control, featuring Active Center Differential (ACD) 4-wheel drive and an Active Yaw Control (AYC) rear differential, provides unprecedented handling and stability on the road or track.
Contract award: active center - intensive activation of sgb ii customers.