n.

an event in which one thing is substituted for another

同義詞：permutationtranspositionreplacementswitch

the act of putting one thing or person in the place of another:

"he sent Smith in for Jones but the substitution came too late to help"

同義詞：exchangecommutation

Generating query substitutions
Side reactions in organic synthesis II: Aromatic substitutions
Contribution of triple substitutions to the electron correlation energy in fourth order perturbation theory
Maximum likelihood estimation of the number of nucleotide substitutions from restriction sites data.
Estimation of the number of nucleotide substitutions when there are strong transition-transversion and G+C-content biases.
DNA Fragments Differing by Single Base-Pair Substitutions are Separated in Denaturing Gradient Gels: Correspondence with Melting The...
A simple method for estimating evolutionary rates of base substitutions through comparative studies of nucleotide sequences
A convenient synthesis of acetylenes: catalytic substitutions of acetylenic hydrogen with bromoalkenes, iodoarenes and bromopyridines
Simple methods for estimating the numbers of synonymous and nonsynonymous nucleotide substitutions.
8-Hydroxyguanine, an abundant form of oxidative DNA damage, causes G----T and A----C substitutions.