entrainment

in photochemistry
https://doi.org/10.1351/goldbook.ET07371
Term used in photostimulated radical nucleophilic substitution to designate the induction of the reaction of a less reactive (or non-reactive) nucleophile with a substrate by the addition of catalytic amounts of another nucleophile, more reactive at @I03042@. Often, the non-reactive nucleophile at @I03042@ is, however, quite reactive at @P04881@.
Note:
Term also used in @PT07445@ in connection with the setting of the circadian clock by biological photosensors such as phytochromes and cryptochromes in plants and cryptochromes in mammals and insects.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 335 [Terms] [Paper]