Molecular Recognition, Information and Signals. Semiochemistry

The resulting area of investigation has been termed semiochemistry (from the Greek OTll eiOV sign, signal), the chemistry of molecular signal generation, proces- 

Signal transfer through a membrane may occur either by translocation of a species (carrier or channel facilitated) or by transduction via effector/receptor binding (see also Section 8.5.1). 

The formation of supramolecular entities from photoactive components may be expected to pertub the ground-state and excited-state properties of the individual species, giving rise to novel properties that define a supramolecular photochemistry [8.2, A. 10, A.20J. 

a number of processes may take place within supramolecular systems, modulated by the arrangement of the components excitation energy migration, photoinduced charge separation by electron or proton transfer, perturbation of optical transitions and polarizabilities, modification of redox potentials in ground or excited states, photoregulation of binding properties, selective photochemical reactions, etc. 

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