| 释义 |
active center
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. active site active center
ac·tive cen·terthe part of a macromolecule at which a substrate or ligand, on binding, produces biologic activity; for an enzyme, this is the catalytic center, the site on an enzyme that catalyzes the reaction. |