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modification

modification (mod´i-fi-ka´shun)

1. A nonhereditary change in an organism; e.g., one that is acquired from its own activity or environment. 2. A chemical or structural alteration in a molecule.
behavior m. the systematic use of principles of conditioning and learning, especially operant or instrumental conditioning, to teach certain skills or to extinguish undesirable behaviors, attitudes, or phobias.
chemical m. alteration in the structure of a molecule, typically a macromolecule such as a protein, by chemical means; often, the covalent addition by some reagent.
covalent m. alteration in the structure of a macromolecule by enzymatic means, resulting in a change in the properties of that macromolecule; frequently, this type of m. is physiologically relevant.

 

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