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Não disponívelThe main purposes of this work are to study.ekistence and regularity, with respect to time and to a parameter, of ; .bounded solutions of certain equations both in finite and infi-- 1 : nite dimension, and to apply these results to the analysis ofi existence and bifurcation of homoclinic and heteroclinic solu + tions in models which involve ordinary as well-as partial diffg rential nOnlinear equations. Special enphasis is given to & noª linear beam equation which extends a model proposed by Holmes-- Marsden by including an unbounded term\'depending on the paramg ter. . . The main tools used are Alternative Method with an appropriate Fredholm Alternative, Uniform Contraction Principle and Semiqroup Theory