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active site
(redirected from Catalytic site)

   Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia 0.01 sec.
active site
n.
The part of an enzyme molecule at which catalysis of the substrate occurs.

active site,
the place on the surface of an enzyme where its catalytic action occurs.

active
not passive.

active principle
the drugs or chemicals in a pharmaceutical preparation that exert an effect pharmacologically; as distinct from the inert fillers, wetting agents and other excipients also often included.
active site
that region of a protein, usually an enzyme, that binds to another molecule such as the substrate of the enzyme.
active transport
the movement of ions or molecules assisted by a carrier protein across the cell membranes and epithelial layers, usually against a concentration gradient, resulting directly from the expenditure of metabolic energy. For example, under normal circumstances more potassium ions are present within the cell and more sodium ions extracellularly. The process of maintaining these normal differences in electrolytic composition between the intracellular fluids is active transport. The process differs from simple diffusion or osmosis in that it requires the expenditure of metabolic energy.


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Platinum Plus both catalytically activated the oxidation of soot in the engine and exhaust, and provided a constant replenishment of active catalytic sites on the filter surfaces.
Contaminants in water which are adsorbed rather than reacted tend to occlude catalytic sites, eventually reducing chloramine removal efficiencies to the point where thermal reactivation or replacement is necessary.
Hoskins hope to design frameworks into which only specific reactant molecules can enter and then leave after being transformed into specific products at internal catalytic sites.
 
 
 
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