``On the stability of asymptotic properties for perturbed $C_{0}$-semigroups'',

We give conditions on a strongly continuous semigroup F and an unbounded perturbation B in the class of Miyadera-Voigt such that the perturbed semigroup. S inherits asymptotic properties of F as boundedness, asymptotic almost periodicity, uniform ergodicity and total uniform ergodicity. A systematic application of the abstract result to partial differential equations with delay is made